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el97xx sERIES - USER MANUAL

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1. ULCAL OxOA3E 2 W R Voltage low end calibration target value double type UHCAL Ox0A40 2 W R Voltage high end calibration target value double type TAGSCAL Ox0A42 1 W R Calibration state tag u16 type U 0x0B00 2 R Voltage Register double type 0x0B02 2 R Current Register double type SETMODE 0x0B04 1 R Operation Mode register u16e type INPUTMODE 0x0B05 1 R Input Status Register u16 type MODEL OxOBO6 1 R Model Register u16 type EDITION OxOBO7 1 R software version number register u16 type 4 8 8 The Definition Of The Command Register CMD Definition CMD Value Description CC 1 CV 2 CW 3 CR 4 CC Soft Start 20 Dynamic Mode 25 Short Circuit Mode 26 List Mode 27 CC Loading And Unloading Mode 30 CV Loading And Unloading Mode 31 CW Loading And Unloading 32 Mode CR Loading And Unloading Mode 33 CC Mode Switch To CV Mode 34 CR Mode Switch To CV Mode 36 Battery Test Mode 38 CV Soft Start 39 Changin System Parameters 41 Input ON 42 Input OFF 43 4 8 9 Common Operation Function Description Table 1 Remote Control Operation Operation Register Value Description Force Single Coil PC1 1 mandatory Table 2 cancels remote control operation Operation Register Value Description Force Single Coil PC1 0 mandatory Table 3 Local Prohibition control operations Operation Register Value Description 39 Intepro Systems
2. UCROFFSET 0x0A1B W R Constant resistance unload voltage register double type UCCCV 0x0A1D W R constant current shift constant voltage register double type UCRCV OxOA1F W R Constant resistance shift constant voltage register double type IA Ox0A21 W R dynamic mode A phase current register double type IB 0x0A23 W R dynamic mode B phase current register double type TMAWD Ox0A25 W R dynamic mode A pulse width registers double type TMBWD 0x0A27 W R dynamic mode B pulse width registers double type TMTRANRIS 0x0A29 W R Dynamic mode rising time register r double type TMTRANFAL 0Ox0A2B W R Dynamic model falling time register double type MODETRAN 0x0A2D W R Dynamic mode register u16 type UBATTEND Ox0A2E W R Battery Test termination voltage register double type BATT 0x0A30 W R Battery capacity register double type SERLIST 0x0A32 W R LIST serial number register u16 type SERATEST 0x0A33 W R Automatic Test serial number register u16 type IMAX 0x0A34 W R Current maximum register double type UMAX 0x0A36 W R Voltage maximum register double type PMAX 0x0A38 W R Power maximum register double type ILCAL Ox0A3A W R Calibration current low end target value double type DS Ge Wo Current high end calibration target value double type ULCAL 0x0A3E W R ae Voltage low end calibration target value double type SE EE NR Voltage high end calibration target value
3. Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset TMCCS Double Optional Multi Registers Preset CMD 20 mandatory Multi Registers Table 13 CV mode soft start Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset TMCVS Double Optional Multi Registers Preset CMD 39 mandatory Multi Registers Table 14 CC loading and unloading mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCONSET Double Optional Multi Registers Preset UCCOFFSET Double Optional Multi Registers Preset CMD 30 mandatory Multi Registers Table 15 CV loading and unloading mode Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset UCVONSET Double Optional Multi Registers Preset UCVOFFSET Double Optional Multi Registers Preset CMD 31 mandatory Multi Registers Table 16 CW loading and unloading mode Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset UCPONSET Double Optional Multi Registers 40 Intepro Systems 2012 Preset UCPOFFSET Double Optional Multi Registers Preset CMD 32 mandatory Multi Registers Table 17 CR loading and unloading mode Operation
4. Model Fuse specification Fuse specification 110VAC 220VAC EL9717 T2 5A 250V T1 25A 250V EL9717B T2 5A 250V T1 25A 250V EL9717C T2 5A 250V T1 25A 250V EL9718 T2 5A 250V T1 25A 250V EL9718B T2 5A 250V T1 25A 250V 4 Replace the Fuse Open the plastic cover in the rear panel of the electronic load with a flat screwdriver see the table 3 1 and find the blowout fuse Then replace the bad fuse with a new one Picture 3 1 Fuse Location 3 3 Front Panel Operation Please refer to the picture3 2 for the front panel of EL97 electronic load MS712C 0 150V 300W Maynuo OC ELECTRONIC LOAD 00EG E u anona Eet a GGG Ce GI Picture 3 2 Front panel The upper half is black VFD display screen and knob The bottom half left side to right side is Numeric keys 0 9 ESC key Function keys Up Down keys Enter key Input terminal and Output terminal Intepro Systems 2012 oo Sa mmm To e w EEN mmm po e e rn ren er CR 2 ee i 6 eS Ss ey SoA H Weem Ss Ss Sar ER cm W s aS NR Ce ES E en Wm Wm o oo WE eae A ON mp E lt lt a wa i SS GE SOS mee SS ON SO e eem I eS See SN a aS TES Sass MEE rm aS mem a ee Se LS eS Ss a D mge Se re i Ey SP SEEN Se SS i ie a mme pr r a Se A ma E peje e e Tom eeng g We Se m AEN WR me re EH gg ee ee gt 8 mem Em UE a mmm mm rn vg mmm Fe a See Picture 3 3 The back panal
5. Procedure Display Explanation 1 Power on the SYSTEM SELF TEST The electronic load start power on self test electronic load Vxxx and the VFD display shows the software serial No 2 Wait for 1s after EPROM ERROR EEPROM damage or lost data of last power turn on electronic load off ERROR CAL DATA EEPROM lost calibration data 3 Wait for another 2S XXXXXXXV XXXXXXXA Display the actual input voltage and current once ERROR XXXXXXXW gt XXXXXXXX_ value actual power value and setting value occurred 3 2 In Case Of Trouble If electronic load fails to run during power on operation the following test will help you to solve the problems that might be encountered 1 Make sure if you have connected the power properly and On Off switch has been pressed 2 Check the power voltage setting There are two voltages which can make load work 110V or 220V Please make sure you get the right voltage in accordance to the voltage in your area 3 Check the fuse of load If fuse is blowout please change another fuse with the following specification Intepro Systems 2012 Model Fuse specification Fuse specification 220VAC 110VAC EL9713 T1 25A 250V T2 5A 250V EL9713B T1 25A 250V T2 5A 250V EL9714 T1 25A 250V T2 5A 250V EL9714B T1 25A 250V T2 5A 250V 4 Replace the fuse Open the plastic cover in the rear panel of the electronic load with a flat screwdriver see the table 3 1 an
6. Name Address Bit Property Description PC1 0x0500 1 W R When remote control status bit is 1 front key panel unable PC2 0x0501 1 W R When local prohibition bit is 1 not allow to use key Shift 7 to snatch away the front panel control TRIG 0x0502 1 W R Trigger tagged triggered once by software REMOTE 0x0503 1 W R 1 remote input voltage ISTATE 0x0510 1 R Input status 1 input ON 0 intout OFF TRACK 0x0511 1 R Tracking status 1 voltage tracking 0 current tracking MEMORY 0x0512 1 R 1 input state memory VOICEEN 0x0513 1 R 1 key sound ON OFF CONNECT 0x0514 1 R 1 multi O single ATEST 0x0515 1 R 1 Automatic test mode ATESTUN 0x0516 1 R 1 Automatic test pattern waiting to trigger ATESTPASS 0x0517 1 R 1 success automatic test success 0 automatic test failed IOVER 0x0520 1 R 1 over current tag UOVER 0x0521 1 R 1 over voltage tag POVER 0x0522 1 R 1 over Power tag HEAT 0x0523 1 R 1 over heat tag REVERSE 0x0524 1 R 1 reverse tag UNREG 0x0525 1 R 1 register parameter failed tag ERREP 0x0526 1 R 1 EPPROM error tag ERRCAL 0x0527 1 R 1 calibration data error tag Table 2 Register XRAM area definition Name Address Bit Property Description ne vere ZS Command Register lower 8 bits effective high 8 bits meaningless IFIX Ox0A01 2 W R Constant current register double type UFIX 0x0A03 2 W R Constant voltage register double type PFIX Ox0A05 2 W R Constant power register
7. I Vin DI i V HIM i Sr d ii Ht J ht At AWE EE 1 od 4 Picture 3 1 Fuse Location 3 3 Front Panel Operation Please refer to the picture3 2 for the front panel of EL97 electronic load Picture 3 2 Front panel OU 16 character display shows voltage and current measurements Rotary knob Turn to adjust a setting value Press in to toggle between setting the currently selected mode s value and reading the voltage and current as shown in the above picture 6 Intepro Systems 2012 Numeric keypad Numeric entry keys Secondary key functions 4 Keypad Enable disable input Set up the current voltage power and resistance modes Scroll through menus and options Input terminals Depending on the model you will have different types and numbers of input Terminals Models EL9711 EL9712 EL9712B EL9712C EL9712B30 M981 1 M9812 M9812B come with one plus and one minus termina Models EL9713 EL9713B EL9714 EL9714B EL9715 EL9715B EL9716 EL9716B come with two positive and two negative terminals however each terminal is able to sink the maximum current supported by the instrument Thus it is not necessary to double up on the wires when sinking a high current unless you wish to di Wl I i lu Int e e H em mmm WT ae mm o n mmm mn ee mm emm e mee me age
8. Load input voltage v2 eet Power set V3 haben SR EE T2 iB i Load current Picture 4 9 Constant Power Mode 4 1 4 1 Setting up a Standard Constant Power Mode Press the key P SET then the VFD display will show STANDARD POWER xxxxxxxxW indicating the current constant power Then Press the numeric keys and decimal point key to enter the constant power value required followed by pressing the key Enter In this way the load will enter into the standard constant power mode Intepro Systems 2012 If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW or Unreg Showing CW means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage of the power supplier is normal and the maximum output current of the measured power supplier is undercurrent If you want to fine tune the constant power value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant power value you s
9. 0x01 0x03 0x04 0x41 0x20 0x00 0x2A Ox6E 0x1A among which 0x41 0x20 0x00 Ox2A is the read back voltage value the corresponding floating point number is 10V 4 Preset Multiple Registers 0x10 Preset Multiple Registes Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 n 1 32 Byte count 1 2 n Preset Data 2 n CRC Error Check 2 Preset Multiple Registers Example Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 N CRC Error Check 2 Preset Multiple Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x90 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example sets the load s constant current IFIX is 2 3A at slave device address 0x01 From table 4 8 7 1 we know that the IFIX register address is 0x0A01 the floating point takes up two word length Query 0x01 0x10 Ox0A 0x01 0x00 0x02 0x04 0x40 0x13 0x33 0x33 OxFC 0x23 The Corresponding Normal Response 0x01 0x10 0x0A 0x01 0x00 0x02 0x13 0xDO 4 8 7 Coil with the Register Address Allocation Table 1 Coil bit definition 36 Intepro Systems 2012
10. CC Soft Start 20 Dynamic Mode 25 Short Circuit Mode 26 List Mode 27 CC Loading And Unloading Mode 30 CV Loading And Unloading Mode 31 CW Loading And Unloading 32 Mode CR Loading And Unloading Mode 33 CC Mode Switch To CV Mode 34 CR Mode Switch To CV Mode 36 Battery Test Mode 38 CV Soft Start 39 Changin System Parameters 41 Input ON 42 Input OFF 43 4 8 9 Common Operation Function Description Table 1 Remote Control Operation Operation Register Value Description Force Single Coil PC1 1 mandatory Table 2 cancel remote control operation Operation Register Value Description Force Single Coil PC1 0 mandatory Table 3 Local Prohibition control operations Operation Register Value Description Force Single Coil PC2 1 mandatory Table 4 Local allows the operator to Operation Register Value Description Force Single Coil PC2 0 mandatory Table 5 Input ON operation Intepro Systems 2012 Operation Register Value Description Preset CMD 42 mandatory Multi Registers Table 6 Input OFF operation Operation Register Value Description Preset CMD 43 mandatory Multi Registers Table 7 Short circuit operation Operation Register Value Description Preset CMD 26 mandatory Multi
11. Filed Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Byte Count 1 1 2 Data Coil Status n CRC Error Check 2 Read Coil Status Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x81 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example reads the load input state ISTATE of Coil at slave device address 0x01 From table 4 8 7 1 we know that the ISTATE address is 0x0510 Query 0x01 0x01 0x05 0x10 0x00 0x01 OxFC 0xC3 The Corresponding Nomal Response 0x01 0x01 0x01 0x48 0x51 OxBE among which 0x48 is the read back data and its lowest bit is 0 this means the input state ISTATE is OFF 2 Force Single Coil 0x05 Force Single Coil Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x05 Coil Address 2 0 OxFFFF 34 Intepro Systems 2012 Force Data Coil Status 2 0x0000 or xFFOO CRC Error Check 2 Force Single Coil Example Normal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Coil Address 2 0 OxFFFF Force Data Coil Status 2 0x0000 or OxFFOO CRC Error Check 2 Force Single Coil Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x85 Abnormal Code 1 01 0
12. LIST CONTINOUS means continuous output mode LIST END HOLD means the electronic load will remain the last value you set in the last step when all the steps you set in one set of data have been successfully executed LIST END RESET means the electronic load will reset to be load off mode when all the steps you set in one set of data have been successfully executed 3 After pressing the key Enter to confirm the VFD display will show STEP LENG xxx indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round number of 1 200 4 When the VFD display shows STEP 1 CURR xxxxxA indicating the current that requires to be set in the first step press the numeric keys to input the current you want to set in the first step followed by pressing the key Enter to confirm When the VFD display shows STEP 1 TM xxxxx mS indicating the current duration in the first step press the numeric keys to input the current duration you want to set in the first step followed by pressing the key Enter to confirm 5 If all the steps set have been edited the VFD display will show EDIT LIST meaning exit back to the list function If all the steps set have not been edited the VFD display will show STEP n CURR xxxxxA indicating that data of the N step is being edited Please finish it according to the operation instru
13. Multi Registers Table 12 CC mode soft start Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset TMCCS Double Optional Multi Registers Preset CMD 20 mandatory Multi Registers Table 13 CV mode soft start Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset TMCVS Double Optional Multi Registers Preset CMD 39 mandatory Multi Registers Table 14 CC loading and unloading mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCONSET Double Optional Multi Registers Preset UCCOFFSET Double Optional Multi Registers Preset CMD 30 mandatory Multi Registers Table 15 CV loading and unloading mode Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset UCVONSET Double Optional Multi Registers Preset UCVOFFSET Double Optional Multi Registers Preset CMD 31 mandatory Multi Registers Table 16 CW loading and unloading mode Operation Register Value Description 41 Intepro Systems 2012 Preset PFIX Double Optional Multi Registers Preset UCPONSET Double Optional Multi Registers Preset UCPOFFSET Double Optional Multi Registers Preset CMD 32 mandatory Multi Registers Table 17 CR loading and unloading mode Operation Register Value Description Preset HEIN Double Option
14. Multi Registers Table 15 CV loading and unloading mode Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset UCVONSET Double Optional Multi Registers Preset UCVOFFSET Double Optional Multi Registers Preset CMD 31 mandatory Multi Registers Table 16 CW loading and unloading mode Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset UCPONSET Double Optional Multi Registers Preset UCPOFFSET Double Optional 41 Intepro Systems 2012 Multi Registers Preset CMD 32 mandatory Multi Registers Table 17 CR loading and unloading mode Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRONSET Double Optional Multi Registers Preset UCROFFSET Double Optional Multi Registers Preset CMD 33 mandatory Multi Registers Table 18 CC mode switch to CV mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCCV Double Optional Multi Registers Preset CMD 34 mandatory Multi Registers Table 19 CR mode switch to CR mode Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRCV Double Optional Multi Registers Preset CMD 35 Must select Multi Registers Table 20 battery test mode Operation Register Value Description
15. Preset IFIX Double Optional Multi Registers Preset UBATTEND Double Optional Multi Registers Preset CMD 38 mandatory Multi Registers Table 21 Dynamic Test Mode Operation Register Value Description Preset IA Double Optional 42 Intepro Systems 2012 Multi Registers Preset IB Double Optional Multi Registers Preset TMAWD Double Optional Multi Registers Preset TMBWD Double Optional Multi Registers Preset TMTRANRIS Double Optional Multi Registers Preset TMTRANFAL Double Optional Multi Registers Preset MODETRAN 0 2 Optional Multi Registers Preset CMD 25 mandatory Multi Registers Table 22 System parameter setting mode Operation Register Value Description Preset IMAX Double Optional Multi Registers Preset UMAX Double Optional Multi Registers Preset PMAX Double Optional Multi Registers Force Single Coil REMOTE 0xFF00 0x0000 Optional Preset CMD 41 mandatory Multi Registers 4 9 Remote operation The DB9 interface connector on the rear panel of the power supply can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 the following information will tell you how to use the computer to control the output of the power supply Before carrying out the remote operation mode please use the voltage level shift cable M 131 or M 133 provided by our company for M 131 or M 133
16. followed by pressing the key Enter to confirm If in last step step 3 you choose load off mode or short circuit mode then the electronic load will skip step 4 25 Intepro Systems 2012 5 When the VFD display shows DELAY TM xx xS indicating the delay time of each step The valid range of the delay time is 0 1 25 5S The lower value you set the shorter time the test needs But in certain circumstances too lower value may affect the test results because the test has been finished before the power supply reaches static state so please carefully select the delay time you wanted to set The recommended delay time is 0 5S Note 25 5S is set as suspended mode So the delay time of a certain step is set as 25 5S the load will stop to be proceeded to the next step until a trigger is input The trigger can be made either by the hardware in the back panel or by pressing the key Shift Trigger or the On Off key in the front panel 6 When the VFD display shows INPUT xxxx xxxxxx indicating the corresponding current value set voltage value set power value set resistance value set in working mode Press the numeric keys to enter the value followed by pressing the key Enter to confirm If in step 3 you choose load off mode or short circuit mode then the electronic load will skip step 6 7 When the VFD display shows MINIMUM xxxx xxxxxx indicating the lower limit of valid comparison press numeric keys to input the v
17. steps can be edited in each set of data Users can edit the duration of each step the minimum time of each set of data Please note that the minimum time should be the round numbers of 0 02mS and ranges from 0 02mS to 1310 7mS The duration of each step has something to do with the minimum time you set If the minimum time is set as 0 02mS then the duration of each step ranges from 0 02mS to1310 7mS if the minimum time is set as 2mS then the duration of each step ranges from 2mS to 131070mS 4 2 7 1 List Operation 1 Press the key Shift 0 to enter into the menu operation and then press the A and VW keys to get the item MENU LIST followed by pressing the Enter key to confirm Then press the A and VW keys to get the item EDIT LIST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows MINIMUM TM xxxxxx mS indicating the minimum time that requires to be set Since this value affects the fine tuning and operable length of all kinds of waveforms please carefully select the suitable parameters Then press the key Enter to confirm The electronic load will go into the following three output modes LIST CONTINOUS LIST END HOLD and LIST END RESET Press the A and Y keys to select one output mode you wanted followed by pressing the key Enter to confirm LIST CONTINOUS means continuous output mode LIST
18. the triangular wave might function as square wave there are 0 100 accuracy difference according to the different rising time and falling time set 4 2 5 3 Trapezoidal Wave When the four time parameters that need to set are all bigger than zero and the dynamic testing operation mode is continuous mode the load output wave is trapezoidal wave It has the same frequency characteristics with the triangular wave 4 2 6 Trigger Control When dynamic testing operation mode is set as pulse mode or trigger mode the trigger control is initiated There are three trigger modes ay Keypad triggering mode Press the key Shift Trigger to p trigger the electronic load b TTL triggering mode Send a high pulse with a constant time more than 5m Sec to the trigger In terminals in rear panel to trigger the electronic load Cy PC control software triggering mode 22 Intepro Systems 2012 4 2 7 List Function The electronic load is available of list operation function 8 sets of data can be edited at most and 200 steps can be edited in each set of data Users can edit the duration of each step the minimum time of each set of data Please note that the minimum time should be the round numbers of 0 02mS and ranges from 0 02mS to 1310 7mS The duration of each step has something to do with the minimum time you set If the minimum time is set as 0 02mS then the duration of each step ranges from 0 02mS to1310 7mS if the minimum time is set as 2mS then the
19. then press Enter to confirm the load will display ADDRESS ADDR xxx you can change the address number by press the numeric keys and press the key Enter again to confirm Note The valid additional address number is integers in the range of 1 200 3 Select the check mode Press Shift 0 in turn enter into the main Menu the load will display MENU CONFIG press the key Enter to confirm the load will get into CONFIG menu press A and Y key button to let the load display CONFIG COMM PARITY press Enter to confirm then the load will display COMM PAR xxxxx you can select the parity check mode by pressing A and Y key button and then press Enter to confirm 4 8 3 Communication interface DB9 and its pin s define 1 5V 2 TXD 3 RXD 4 NC 5 GND 31 Intepro Systems 2012 8 NC 9 NC 4 8 2 Setup Baudrate Press Shift 0 in turn the load will display MENU CONFIG Press Enter to confirm the load will enter into CONFIG menu press A and key button to let the load display CONFIG BAUDRATE SET press Enter to confirm the load will display BUADRATE xxxxx you can choose the appropriate baudrate as you need and press Enter to confirm Totally 6 different baudrate provided for selection 2400 9600 14400 28800 57600 115200 4 8 3 Data In some data frame the date length is fixed but there are some data frame length is not fixed According to Modbus protocol in the data field all the hex data and floating point number are form
20. voltage value required followed by pressing the key Enter In this way the load will enter into the standard constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV or Unreg Showing CV means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage of the measured power supplier is normal and if the output current is beyond the maximum current that the load can carry If you want to fine tune the constant voltage value you can rotate the selective encoder knob locating at the right upper corner of the front panel to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Note if the constant voltage value you want to set is beyond the maximum constant voltage value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant voltage value you set among which a cursor shows under one number meaning this number requires fine tuning If users wan
21. 0 2 25 5S INPUT xxxx Input the parameters set for example CC mode 1A MINIMUM xxxx Input the minimum lower limit MAXIMUM xxxx Input the maximum upper limit SETUP AUTO TEST TRIGGER Trigger output selection WHEN PASS Trigger once when passing the test WHEN FAIL Trigger once when failing the test WHEN TEST END Trigger output is initiated when test ends DISABLE Disable trigger output OUTPUT Output electrical characteristics selection PULSE Pulse output LEVEL Voltage level output EXIT EXIT Intepro Systems 2012 Chapter 4 Panel Operation 4 1 Basic Operation Mode There are four operation modes for electronic load 1 Constant current CC 2 Constant voltage CV 3 Constant resistance CR 4 Constant power CW 5 Constant current shifting into constant voltage mode CC CV 6 Constant resistance shifting into constant voltage mode CR CV 4 1 1 Constant Current Operation Mode CC In this mode the electronic load will sink a current in accordance with the programmed value regardless of the input voltage Please refer to the picture 4 1 If maximum current value of the measured power supply is lessen than the constant current value set the electronic load might fail to adjust itself to the constant current and the voltage of the measured power supply could be changed to be low I Current Set Load current gt Load voltage y 4 1 Constant Current Mode 4 1 1 1 Setting up a Standard Constant C
22. 1 40 1 FS 0 1 0 1 ES BEUR Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS Current CC 26 4A 5 a 2A 132A 5 264A 264A 13 2A 132A Voltage CV 35mQ 0 40 C 10 C 70 C Intepro Systems 2012 CR ER RE nee CC Mode 0 1 0 05 FS 0 15 0 1 FS CV Mode GR Mode Valiage and GW Mode Voltage and measument 0 1 0 1 FS 0 2 0 15 FS W Measurement Ulm sw 210 full measument 0 1 0 2 FS 0 2 0 15 FS Battery Measurement Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Dynamic Measurement Transition List 0 25kHZ 5A uS T1 amp T2 60uS 999S Accuracy 15 offset 10 FS CC soft startup Time 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS SC Short Gren Vatiage CV Resistance CF Operating 0 40 C Temperature Nonoperating 10 C 70 C WFH Dimm SA Weight Intepro Systems 2012 2 2 Electronic Load Dimension 4 LU DEERIIGSHUNR ngUanH Li kl HERRNEEUDR mn r a DS HSH a mum J wm Intepro Systems 2012 Chapter 3 Quick Reference 3 1 Power on self test Verify that you have received the following items with your power supplier If anything is missing contact your nearest Sales Office One power cord for
23. 25kHZ 2 5A uS T1 amp T2 60uS 9998 Accuracy 15 offset 10 FS CC soft startup Time 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS Current CC 533A 533A 533A 533A 533A WEI 6 6A 66A Short Circuit Voltage CV IN IN IN IN SE EES BEER 30m9 25m9 Operating 0 40 C 0 40 C 0 40 C 0 40 C Temperature Nonoperating 10 70 C 10 70 C 10 70 C 10 70 Dimension W H D mm 108 214 365 Weight Kg 3 5 Input Rating CC Mode CV Mode CR Mode Voltage and current input value 210 full measument CW Mode Voltage and current input value 210 full measument V Measurement Measurement W Measurement Voltage and current input value 210 full measument Power Current Voltage Range Resolution Accuracy Range Resolution Accuracy Range Resolution Accuracy Range Resolution Accuracy Voltage Resolution Accuracy Current Resolution Accuracy Watt Resolution Accuracy Intepro Systems 2012 0 3A 0 1mA 0 05 0 05 FS 0 1 19 999V imV 0 03 0 02 FS 0 30 10K 16 bit 0 1 0 1 FS 0 300W 1mW 0 1 0 1 FS 0 19 999V imV 0 015 0 03 FS 0 3A 0 01mA 0 05 0 08 FS 100W 1mW 0 1 0 1 FS EL9712B30 300W 0 30A 0 500V 0 30A 1mA 0 05 0 08 FS 0 1 500V 10mV 0 03 0 05 FS 0 30 5K 16 bit 0 1 0 1 FS 0 300W 10mW 0 1 0 1 FS 0 500V 10mV 0 015 0 05FS 0
24. 30A 0 1mA 0 08 0 08 FS 300W 10mW 0 1 0 1 FS Battery Measurement Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Dynamic Measurement Transition List 0 25kHZ 2 5A uS 1T1 amp T2 60uS 999S Accuracy 15 loffset 10 FS CC soft startup Time 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 loffset 10 FS Ges EEN A Short Circuit Voltage CV OV Resistance CR 280m0 Operating 0 400 Temperature Nonoperating 100 70 Dimension wD ee Note The specification are subject to change without notice please visit our website www InteproATE com for the updated information Intepro Systems 2012 2 2 Electronic Load Dimension Dimension of the models EL9711 EL9712 EL9712B EL9712C and EL9712B30 214mm H x 108mm H x 365mm D These models are provided with a carrying handle The handle can be removed if desired 30 2 3 Environmental Conditions The instrument is intended for the indoor use in a pollution degree 2 environment Operating environmental limits are as follows Parameter Specification Humidity 70 relative humidity non condensing Altitude 2000 m 220AV 10 47 63 Hz AC Line Voltage 110AV 10 47 63 Hz Operating Temperature 0 40 C Storage temperature 20 C 70 C Intepro Systems 2012 Chapter 3 Quick Reference 3 1 Power on se
25. 47 Intepro Systems 2012 USER S MANUAL Programmable DC Electronic Load Models EL97 Series Including EL9717 EL9717B EL9717C EL9718 EL9718B Intepro Systems 2012 Intepro Systems 2012 Content USERS IVAN EE i Mee EE ee 1 Chapter 2 Technical Specifications EE 2 2 1 Main technical Specifications nrrainn eannan a a a a a 2 2 2 Electronic Load Dimension DE 4 Gh apter s Quick Relerence EEN 5 3 1 Ge Ee EE 5 ek gell 5 Oro TON Peale ee 6 3 4 Keypad Directi NS EE 7 3 5 M n OG ATOM E 8 one WENN ee NEE 11 4 1 Basic Operation Mode EE 11 4 1 1 Constant Current Operation Mode CC 11 4 1 1 1 Setting up a Standard Constant Current Mode AA 11 4 1 1 2 Loading and Unloading Constant Current Mode 12 4 1 1 3 Soft Start Constant Current TEE 13 4 1 1 4 Constant Current Shifting into Constant Voltage Mode 13 4 1 2 Constant Resistant Operation Mode CR ccc ccccseessesecseesecseeeeceseeeesseeseeseeseeeeseesees 14 4 1 2 1 Setting up a Standard Constant Resistance Mode 15 4 1 2 2 Loading and Unloading Constant Resistance Mode 15 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode 16 4 1 3 Constant Voltage Operation Mode 16 4 1 3 1 Setting up a Standard Constant Voltage Mode 17 4 1 3 2 Loading and Unloading Constant Voltage Mode 17 4 1 3 3 Soft Start Constant Voltage Mode w icciisscccsisvcsjecctasnacadatdesscact ousted evssceaatacunedcodenccusasuesanaeeese 18 4 1 4 Constant Power Operation Mode CH 19 4 1 4 1 Setting
26. 5 9 NR Ee EE 23 42 e Trigger CONT O BEE 23 Intepro Systems 2012 4 2 7 List PUNCUION seit Accented ats eka ie aa a ttn Lea res 23 4 2 ECH Let Operation aceite ew ind Wannstedt eee 23 4 2 7 2 Executing List Funchon enaa aa A a A A AA 24 4 2 8 Automatic Testing Function esssssssesssessressnessnnssnnesnasnnentnestnnsnnnnnnantnnennnntnnnnaantnnnnanetnnnnannnnnennn 24 42 8 1 Automatic Test le e EE 25 4 2 8 2 Setting up Automatic Test Trigger Output Mode 26 4 2 8 3 Executing Automatic Test Functon eee ceeeceeeeeeeneeeceeeeeeeaeeeeaeeeeeaeeeeaaeeeeaeeseaaeeeeeeeseaeeeeaas 26 CR ele lege EE 27 4 3 1 Short Circuit Operation HOT 27 4 3 2 Input On Off Operation 27 4 4 Electronic Load Operation Hange nanta 27 4 5 Protection Function aenea eas aa EE hr ees 28 4 5 1 Over Voltage Protection ON 28 4 5 2 Over Current Protection IOC 29 4 5 3 Over Power Protection OW 29 4 5 4 Input ele AE EE 29 4 5 5 Over Heat Protection OH 29 4 6 Remote Sense Function e ccecccecceeeceeeeeeeeeceeeceaeeeaceseeeeaeeeaaeeaaeeeaeseaeeeaeseaeeeaaesaaeseaeesaeesaeeeaeeseesieesaees 30 AT Battery Testing EE 31 4 8 Communication protocol ccecccecceeeceeeeeeeeeceseceaeeeeeeeeeeaeeeaaesaaeeeaessaeecaeeeaeseaaesaaeseaeeseeseecessueesieesaees 32 Biere Tee LEE 32 4 82 Setup Ba dr te EE 33 AOS RE EE E 33 4 8 4 FUNC ON GOH EE 33 4 8 5 Error checking CRC cecccceceeeceeeeeceeeceseeeaeeeeceeaeeeaeeaaeecaeecaeecae
27. Command Register lower 8 bits effective high 8 bits meaningless IFIX 0x0A01 2 W R Constant current register double type UFIX 0x0A03 2 W R Constant voltage register double type PFIX 0x0A05 2 W R Constant power register double type RFIX 0x0A07 2 W R Constant resistance register double type TMCCS 0x0A09 2 W R Current soft start rising time register double type TMCVS Ox0A0B 2 W R Voltage soft start rising time register double 36 Intepro Systems 2012 type UCCONSET OxOAOD 2 W R Constant current load voltage register double type UCCOFFSET OxOAOF 2 W R constant current unload voltage register double type UCVONSET Ox0A11 2 W R Constant voltage load voltage register double type UCVOFFSET 0x0A13 2 W R Constant voltage unloaded voltage regi double type UCPONSET 0x0A15 2 W R Constant power load voltage register double type UCPOFFSET 0x0A17 2 W R Constant power unload voltage register doubl type UCRONSET Ox0A19 2 W R Constant resistance load voltage register double type UCROFFSET 0x0A1B 2 W R Constant resistance unload voltage register double type UCCCV OxOA1D 2 W R constant current shift constant voltage register double type UCRCV Ox0A1F 2 W R Constant resistance shift constant voltage register double type IA Ox0A21 2 W R dynamic mode A phase current register double type I
28. DB9 interface connector on the rear panel of the electronic load can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 The following instructions can help you understand how to control the output of power supplier by PC 1 RS232 Setting 44 Intepro Systems 2012 Before using the remote operation mode please make sure that the baudrate and communication address in power supplier are the same as that in the computer software otherwise the communication will fail You can change the baud rate and communication address from the front panel or from computer 1 Baud rate 9600 4800 9600 19200 38400 which are selectable from the menu on the front panel 2 Data bit 8 3 Stop bit 1 4 Parity none even odd 2 DB9 Serial Interface DB9 Serial Interface TXD RXD NC GND NC NC NC aN non FP Ww P rz wo Le Q The output of DB9 interface on the rear panel of the power supplier is TTL voltage level so the voltage level shift cable M 131 or M133 must be applied before connecting the DB9 interface with the serial interface on PC M 131 Voltage Level Shift Cable PC LG Z Q ET EE E ZS E Ze z M 133 Voltage Level Shift Cable PC 45 46 Intepro Systems 2012 1 Z 4 7 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a sta
29. L Load current Picture 4 9 Constant Power Mode 4 1 4 1 Setting up a Standard Constant Power Mode Press the key P SET then the VFD display will show STANDARD POWER xxxxxxxxW indicating the current constant power Then Press the numeric keys and decimal point key to enter the constant power value required followed by pressing the key Enter In this way the load will enter into the standard constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW or Unreg Showing CW means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage of the power supply is normal and the maximum output current of the measured power supply is undercurrent If you want to fine tune the constant power value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant power value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to cha
30. Mode c ccccsceeseeeee cee ceeaeeeeeeeaeeceeecaeeeaeeseeseeeaees 11 4 1 1 2 Loading and Unloading Constant Current Mode 12 4 1 1 3 Soft Start Constant Current Mode sssessesseesesineeessesrnsrnsinstnssrssrsrinttnsinsrnnnnntnasnnsnnnnnnnssnnnnnnnn 13 4 1 1 4 Constant Current Shifting into Constant Voltage Mode s esseesessesseesnesieenesresresnnsnnenssresnnns 14 4 1 2 Constant Resistant Operation Mode CH 14 4 1 2 1 Setting up a Standard Constant Resistance Mode 15 4 1 2 2 Loading and Unloading Constant Resistance Mode c ccscceeececeeeeeeeeeeeeeeeeeeeeeeeeseesaees 15 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode 16 4 1 3 Constant Voltage Operation Mode CH 17 4 1 3 1 Setting up a Standard Constant Voltage Mode 17 4 1 3 2 Loading and Unloading Constant Voltage Mode 18 4 1 3 3 Soft Start Constant Voltage Mode 18 4 1 4 Constant Power Operation Mode CW 19 4 1 4 1 Setting up a Standard Constant Power Mode 19 4 1 4 2 Loading and Unloading Constant Power Mode 20 4 2 Dynamic Testing Operation cccceccescceseceseseceeeceeceeaeeeaeeeaeceaaeeaaeseaeseaeeeaeseaeseaaeeaaeseaeseaeecaeseaeseaeeseesaees 21 4 2 1 Continuous Mode CONTINUOUE seas eeaaeeeaeseaeesaeesaeseaeetaeeeesaees 21 4 2 2 P lse Mode PULSE i Niger 21 4 2 3 Trigger Mode TRIGGER 21 4 2 4 Setting up Dynamic testing operation Parameiers 22 4 2 5 Waveform E re EE 23 42 54 Square Wave TE 23 4 2 5 2 Trlanqular EE 23 42
31. Mode CR In this mode the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance Please refer to the picture 4 5 Note When the voltage of the measured power supply is too high and the resistance set is too low it will result in the consumed current higher than the maxim output current of the measured power supply or result in the loads failing to adjust itself automatically to the constant resistance even result in the load shock Intepro Systems 2012 Load current Slop resistance set gt Load input voltage v Picture 4 5 Constant Resistance Mode 4 1 2 1 Setting up a Standard Constant Resistance Mode Press the key R SET then the VFD display will show STANDARD RESI xxxxxxxxQ indicating the current constant resistance Then Press the numeric keys and decimal point key to enter the constant resistance value required followed by pressing the key Enter In this way the load will enter into the standard constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR or Unreg Showing CR means the load has been successfully set into the expected constant resistance value showing Unreg means the load couldnot adjust itself to the expected constant resistance value Please
32. On Off to start or to pause the battery capability test 4 Press the key Shift 8 Battery to escape the battery capability test mode V Battery Voltage Seege EE Min voltage Load Sink Current T Picture 4 16 Battery Capability Schemas 4 8 Communication protocol 4 8 1 Introduction EL97 series programmable electronic loads work with Modbus protocol The data frame contains 4 parts as follows Salve Address Function Code Data Error Checking CRC To make sure high reliability for the communication we need to set the frame pitch greater than 3 5 times of the transient time of single bit byte Eg When the baud rate is 9600 then the frame pitch time must be greater than 11 8 5 9600 0 004s 32 Intepro Systems 2012 EL97 series programmable electronic loads provided with double way asynchronous communication fixed 1 bit as the start bit 8 data bit and 1 stop bit Support Non parity check Odd Parity check and even parity check Baudrate could be selected as 2400 9600 14400 28800 57600 115200 1 Setup additional address and communication parameter The additional address is a single byte with 16 hexadecimal system data EL97 series electronic loads will only response the request data frame which has the same additional address 2 Setup the additional address Press Shift 0 in turn Enter into the Main Menu the Load will display as MENU CONFIG Press the key Enter to confirm then the lo
33. Sense Function When the load consumes high current the power supply will produce voltage drop in the connecting wire between power supply and load terminals In order to guarantee the measurement accuracy remote measurement terminals are installed at the rear panel of the power supply Users can measure the output terminals voltage of the instrument under test by these terminals Before performing the remote sense function you need to set the power supply as the remote measurement mode see the section 3 6 Menu Function in this manual The remote measurement function can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM TERMINAL SEL indicating to set the parameters of the current remote measurement function then press the key Enter to confirm When the VFD display shows TERMINAL SELECT FRONT or TERMINAL SELECT BACK press the Up and Down keys to select the parameters of remote measurement function Showing TERMINAL SELECT FRONT means input terminals selected is at the front panel and the remote measurement function of the rear panel is closed showing TERMINAL SELECT BACK means input terminals selected is at the rear panel and the remote measurement function of the front panel is closed Then press the key Esc to escape the Menu item Note At any tim
34. When once automatic test is finished users can press the A and YW keys to initiate manually operated test mode Every time press the key A or the key W once the load will begin to the carrying test of the last step or the next step Users can observe the actual state of every step When the key ON OFF is pressed or a trigger is input the electronic load will automatically exit from the manually operated test mode and start to automatic test again 4 3 Input Control 4 3 1 Short Circuit Operation SHORT Load can simulate a short circuit at the input end by turning the load on with full scale current The short circuit can be toggled on off at the front panel by pressing the key Shift 9 Short Short circuit operation does not influence the current value set When short circuit operation is on OFF state the Load will back to the original setting state The actual current value that the load consumes in short circuit condition is dependent on the working mode and current range of the load that are active In CC CW and CR mode the maximum short circuit current value is 1 2 times of the current range In CV mode short circuit operation is same as the operation of setting constant voltage to OV 4 3 2 Input On Off Operation When the load input state is in ON state you can press the key On Off to change the input state into OFF state Then the right upper corner of the VFD display shows OFF When the load input state is in OFF state you can pre
35. accordance to the voltage in your area 3 Check the fuse of the load Intepro Systems 2012 If fuse is blowout please change another fuse with the following specification Model Fuse specification Fuse specification 110VAC 220VAC EL9711 TO 5A 250V T0 3A 250V EL9712 TO 5A 250V T0 3A 250V EL9712B TO 5A 250V T0 3A 250V EL9712C TO 5A 250V T0 3A 250V EL9712B30 T0 5A 250V T0 3A 250V 4 Replace the fuse Open the plastic cover in the rear panel of the electronic load with a flat screwdriver see the table 3 1 Then replace the blowout fuse with a new one Fuse postion Ae otetn oao mem CE cat I Picture 3 1 Fuse Location 3 3 Front Panel Operation Please refer to the picture3 2 for the front panel of EL97 electronic load H een oc ELECTRONIC ioan Picture 3 2 Front Panel The upper half is black VFD display screen Robtary knob Turn to adjust the setting values Intepro Systems 2012 Numeric keys 0 9 ESC key secondary key functions Keypad set up the current voltage power resistance modes Scroll through menus and options Input terminals Power switch to turn on off the instrument CO Up Down keys Enter key dl Il BI C CAT i SoS CULT Picture 3 3 Rear Panel of EL97 Series Load D O full range current in correspond to 0 10V output Oscillograph can be connected by here to observe dynamic waveforms Remote sense te
36. and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to get the item SETUP AUTO TEST followed by pressing the Enter key to confirm The load will enter into the automatic test trigger output mode There are the following 4 types of trigger output modes Please press the A and YW keys to select one you wanted followed by pressing the key Enter to confirm Prompting Messenges Explanation TRIGGER WHEN PASS Trigger once when pass the test TRIGGER WHEN FAIL Trigger once when failing the test TRIGGER WHEN TEST END Trigger once when finishing the test TRIGGER DISABLE Trigger disabled 25 Intepro Systems 2012 Meanwhile the Load will display the following trigger output electrical feature Display Description OUTPUT LEVEL When there is a trigger output the voltage level will change from low to high till a key pressed or a trigger input signal arrive the voltage level will sink to low status OUTPUT PLUSE When there is trigger output the voltage level change from low to high status 5 seconds later it will sink to low automatically 4 2 8 3 Executing Automatic Test Function Press the key Shift 0 to enter into the menu configuration and then press the A and VW keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and V keys to ge
37. by pressing the key Enter to confirm Then the load VFD display shows LEVEL B CURR xxxxxxxxA indicating the current value B set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH B TM xxxxxxxxmsS indicating the current lasting time of current value B set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows FALLING TM xxxxxxxxmsS indicating the current falling time set from value B to value A Press the numeric keys and decimal point key to enter the falling time required followed by pressing the key Enter to confirm Then the load VFD display shows TRANMODE CONTINUOUS TRANMODE PULSE TRNMODE TRIGGER indicating the current dynamic testing operation mode Press the key Aor Y to choose the dynamic testing operation mode you want followed by pressing the key Enter to confirm 22 Intepro Systems 2012 4 2 5 Waveform Control 4 2 5 1 Square Wave When the rise time and falling time are both set as zero and the dynamic testing operation mode is set as continuous mode the output wave is square wave The output frequency is the inverse of the lasting time sum of current A and current B Since the minimum accuracy of all the time is set as 20uS the load can read the square wave with the maximum frequency of 25KHz a
38. check if the measured power supply has been correctly connected and turned on make sure if the output current of the measured power supply is in the range of the current value that the expected resistance can absorb If you want to fine tune the constant resistance value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant resistance value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 2 2 Loading and Unloading Constant Resistance Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant resistance mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant resistance mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal po
39. closed Then press the key Esc to escape the Menuitem Note At any time either the input terminals at the front panel or at the back check if the wire mode matches the parameters of the remote measurement function Please refer to the picture 4 4 for the trigger terminals and measurement terminals S S TRQTRI GND S S TRQ TRI GND 29 Intepro Systems 2012 Piccture4 4 Remote MeasurementTerminals S and S are remote measurementterminals TRQ and TRI are trigger terminals thelast two terminals are ground terminals The output of power supply will beturned off when testing out the change in voltage level from high to low from TRQport which is under the latched mode of the remote control function As amultifunction extended port TRI port is designed for future expanded The following diagram shows the remotesense terminals on the back panel of the instrument The following shows wiring diagramfor the remote sensing Wiring diagram for remote sense 4 7 Battery Testing Experiment proves the test with load is the best method to ensure the battery whether work well or not Only with the correct load testing the battery can be confirmed if it was being the expectant life curve location The EL97xx electronic loads can be used to test any type of the battery nowadays As to any battery used either in sheltered equipment or in the uninterrupted service system it is necessary to use the load testing Because the battery is the lowest
40. display will show STEP n CURR xxxxxA indicating that data of the N step is being edited Please finish it according to the operation instruction in last step step 4 6 Since list function shares the same storage space with automatic testing function please make sure that the sequential code that you selected in the list function is the same with that in automatic testing function If the sequential code which was defined as automatic testing function before now is defined as list function the automatic testing function of this sequential code will be deleted and cannot be restored 4 2 7 2 Executing List Function Press the key Shift 0 to enter into menu configuration and then press the A and W keys to get the item MENU LIS followed by pressing the key Enter to confirm Then press the A and W keys to get the item LOAD LIST followed by pressing the Enter key to confirm Then press the A and YW keys to select the sequential code defined as list function you want to execute followed by pressing the Enter key to confirm Since the list function shares the same storage space with automatic testing function those sequential code defined as the automatic testing function will be automatically shielded when choosing the sequential codes which are defined as list function 4 2 8 Automatic Testing Function The electronic load is available of automatic testing function 8 sets of data can be edited at most and 50 steps can be edited in each set of
41. display will show the word CR_UN or Unreg Showing CR_UN means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supplier is in the range of the current value that the expected resistance can absorb 15 Intepro Systems 2012 In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant resistance mode 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode A I gt U Picture 4 6 Constant Resistance Shifting into Constant Voltage Mode In constant resistance shifting into constant voltage mode the measured power supplier can be avoided from current strike damage When in standard constant current mode press the key Shift 5 CR CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CR TO CV VOLT xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant resistance shifting into constant voltage mode If the input state is in OFF stat
42. double type TAGSCAL 0x0A42 W R one Calibration state tag u16 type U 0x0B00 R Voltage Register double type 37 Intepro Systems 2012 0x0B02 2 R Current Register double type SETMODE 0x0B04 1 R Operation Mode register u16e type INPUTMODE 0x0B05 1 R Input Status Register u16 type MODEL 0x0B06 1 R Model Register u16 type EDITION 0x0B07 1 R software version number register u16 type 4 8 8 The Definition Of The Command Register CMD Definition CMD Value Description CC 1 CV 2 CW 3 CR 4 CC Soft Start 20 Dynamic Mode 25 Short Circuit Mode 26 List Mode 27 CC Loading And Unloading Mode 30 CV Loading And Unloading Mode 31 CW Loading And Unloading 32 Mode CR Loading And Unloading Mode 33 CC Mode Switch To CV Mode 34 CR Mode Switch To CV Mode 36 Battery Test Mode 38 CV Soft Start 39 Changin System Parameters 41 Input ON 42 Input OFF 43 4 8 9 Common Operation Function Description Table 1 Remote Control Operation Operation Register Value Description Force Single Coil DC 1 mandatory Table 2 cancel remote control operation Operation Register Value Description Force Single Coil PC1 0 mandatory Table 3 Local Prohibition control operations Operation Register Value Description Force Single Coil PC2 1 m
43. double type RFIX Ox0A07 2 W R Constant resistance register double type TMCCS 0x0A09 2 W R Current soft start rising time register double type TMCVS Ox0A0B 2 W R Voltage soft start rising time register double type UCCONSET 0x0A0D 2 W R Constant current load voltage register double type UCCOFFSET 0x0A0F 2 W R constant current unload voltage register double type UCVONSET Ox0A11 2 W R Constant voltage load voltage register double type 37 38 Intepro Systems 2012 UCVOFFSET 0x0A13 2 W R Constant voltage unloaded voltage regi double type UCPONSET Ox0A15 2 W R Constant power load voltage register double type UCPOFFSET 0x0A17 2 W R Constant power unload voltage register doubl type UCRONSET 0x0A19 2 W R Constant resistance load voltage register double type UCROFFSET 0x0A1B 2 W R Constant resistance unload voltage register double type UCCCV 0x0A1D 2 W R constant current shift constant voltage register double type UCRCV Ox0A1F 2 W R Constant resistance shift constant voltage register double type IA Ox0A21 2 W R dynamic mode A phase current register double type IB O0x0A23 2 W R dynamic mode B phase current register double type TMAWD Ox0A25 2 W R dynamic mode A pulse width registers double type TMBWD Ox0A27 2 W R dynamic mode B pulse width registers double type TMTRANRIS Ox0A29 2 W R Dynamic mode rising time register r dou
44. fan system will automatically activate based on changing ambient temperatures Soft start time setting activating the power supply in accordance with the set voltage value Battery test and short circuit test functions Capable of rising edge and falling edge dynamic testing Supporting external trigger on either input or output External current waveform monitor terminal output terminal Supports remote voltage compensation and multi data storage Power on self test software calibration and standard rack mountable Edits arbitrary waveforms in list function Available with RS232 RS485 USB serial interfaces Intepro Systems 2012 Chapter 2 Technical Specifications 2 1 Main Technical Specifications We are available of many models of electronic loads Please refer to the following table for the parameters of 150W 300W DC electronic load Model M9711 M9712 M9712B M9712C s Power 150W 300W 300W 300W Input Raitng Current 0 30A 0 30A 0 15A 0 60A Voltage 0 150V 0 150V 0 500V 0 150V Range 0 3A 0 30A 0 3A 0 30A 0 3A 0 15A 0 6A 0 60A CC Mode Resolution Accuracy Range 1 150V 0 1 19 999V 0 1 500V 0 1 19 999V 0 1 150V CV Mode Resolution Jm ImV 10mV ImV 10mV Jm 10mV Accuracy 0 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS CR Mode Range 0 03 2 10K 0 03 2 5K 0 03 2 1
45. initiated when test ends DISABLE Disable trigger output OUTPUT Output electrical characteristics selection PULSE Pulse output LEVEL Voltage level output EXIT EXIT Intepro Systems 2012 Chapter 4 Panel Operation 4 1 Basic Operation Mode There are four operation modes for electronic load 1 Constant current CC 2 Constant voltage CV 3 Constant resistance CR 4 Constant power CW 4 1 1 Constant Current Operation Mode CC In this mode the electronic load will sink a current in accordance with the programmed value regardless of the input voltage Please refer to the picture 4 1 If maximum current value of the measured power supplier is lessen than the constant current value set the electronic load might fail to adjust itself to the constant current and the voltage of the measured power supplier could be changed to be low I Current Set Load current Load voltage v 4 1 Constant Current Mode 4 1 1 1 Setting up a Standard Constant Current Mode Press the key I SET then the VFD display will show STANDARD CURR xxxxxxxxA the current constant current value Press the numeric keys and decimal point key to enter the constant current value required followed by pressing the key Enter to confirm Then the load will enter into the standard constant current If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press
46. is beyond 150V it will be automatically adjusted to 150V Besides the maximum voltage value has close relation with the voltage resolution If the maximum voltage value is below 20V the load voltage resolution will be 0 1mV if the maximum voltage value is beyond 20V then the load voltage resolution will be only 1mV 4 5 2 Over Current Protection OC When input current exceeds the current limit Buzzer will sound and VFD display will shows OVER CUR The load maximum voltage value can be set by pressing the key Shift O0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA indicating the current maximum current value Press the numeric keys and decimal point key to enter the maximum current value required followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum current value of EL9711 electronic load is 30A When it is beyond 30A it will be automatically adjusted to 30A Besides the maximum current value has close relation with the current resolution If the maximum current value is or is below 3A the load current resolution will be 0 01mA If the maximum current value is beyond 3A then the load current resolution will be only 0 1mA 4 5 3 Over Power Protection OW When input power exceeds the power limit buzzer will sound and VFD display will show OVER POW Users need to press any key to get the load
47. keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_S or Unreg Showing CC_S means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supplier In loading and unloading constant current mode press the key Shift 2 S_Start the load will back into the standard constant current mode Note The rise time set is automatically regulated to be the round number times of 20uS 4 1 1 4 Constant Current Shifting into Constant Voltage Mode In constant current shifting into constant voltage mode the measured power supplier can be avoided from current strike damage 13 Intepro Systems 2012 Load input voltage v Picture 4 4 Constant Current Shifting into Constant Voltage Mode When in standard constant current mode press the key Shift 4 CC CV to enter into the constant current shifting into constant voltage
48. maximum input current is beyond the maxim current that the load can absorb the load couldn t control the voltage to the value set 17 Intepro Systems 2012 Load input Volt Set Voltage Load current Picture4 7 Constant Voltage Mode 4 1 3 1 Setting up a Standard Constant Voltage Mode Press the key V SET then the VFD display will show STANDARD VOLT xxxxxxxxvV indicating the current constant voltage value Then Press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter In this way the load will enter into the standard constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV or Unreg Showing CV means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage of the measured power supply is normal and if the output current is beyond the maximum current that the load can carry If you want to fine tune the constant voltage value you can rotate the selective encoder knob locating at the right upper corner of the front panel to adjust the value R
49. minimum range then the load current resolution will be only 10x 4 5 3 Over Power Protection OW When input power exceeds the power limit buzzer will sound and VFD display will show OVER POW Users need to press any key to get the load work normally Note If the current input state is in OFF state you need to press the key ON OFF to make the load work normally If the over power problem is not solved the load will shows OVER POW again The load maximum power value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM PMAX xxxxxxxxW indicating the current maximum power value then enter the maximum power value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum power value of EL9713x electronic load is 600W and 1200W for the EL9714x When it is beyond the maximun it will be automatically adjusted to the maximum 28 Intepro Systems 2012 4 5 4 Input Polarity Reversed When the electronic load is in input polarity reversed state the buzzer will sound and the VFD display will show REVERSE 4 5 5 Over Heat Protection OH If internal power component s temperature exceeds 80C over temperature heat protection will init
50. mode When the VFD display shows CC TO CV VOLT xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant current shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC CV or Unreg Showing CC CV means the load has been successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant current mode press the key Shift 4 CC CV the load will back into the standard constant current mode 4 1 2 Constant Resistant Operation Mode CR In this mode the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance Please refer to the picture 4 5 Note when the voltage of the measured power supplier is too high and the resistance set is too low it will result in the consumed current higher than the maxim output current of the measured power supplier or result in t
51. of the VFD display shows the constant current value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 1 2 Loading and Unloading Constant Current Mode Loading and unloading mode can well protect the measured power supplier from damage When the voltage of the measured power supplier begins to increase the load will automatically adjust itself to the open circuit state and begin to carry the measured power supplier and adjust itself to the current value set only when the voltage of the measured power supplier has been increased to the ONSET loading voltage When the voltage of the measured power supplier begins to decrease and has been decreased to the OFFSET unloading value the load will automatically adjust itself to the open circuit state If the ONSET loading voltage value is higher than the OFFSET unloading voltage value the load can be avoided from frequent carrying and unloading at the critical point of unloading voltage thus the measured power supplier can be well protected ON SET OFF SET OFF ON OFF Picture 4 2 Loading and Unloading Mode When in standard constant current mode press the key Shift 1 V_Level and enter into the loading and unloading constant current mo
52. on make sure if the voltage is normal and if the output current of the measured power supply is in the range of the current that the expected power can absorb In loading and unloading constant power mode press the key Shift 1 V_Level the load will back into the standard constant power mode 4 2 Dynamic Testing Operation Dynamic testing operation enables the electronic load to periodically switch between two load levels This function can be used to test the transient characteristics of the measured power supply Dynamic testing operation can be turned on and off by pressing the key Shift 4 Ip 3 at the front panel Before you turn on dynamic testing operation you should set all of the parameters associated with dynamic testing operation by pressing the key Sit ul Sien including Value A A pulse time Rising time from value A to value B Value B B pulse time Falling time from value B to value A and dynamic testing operation mode There are three kinds of dynamic testing operation mode continuous mode pulse mode and trigger mode 4 2 1 Continuous Mode CONTINUOUS In this mode the electronic load will periodically switch between value A and value B when the dynamic testing operation is turned on 20 Intepro Systems 2012 2 0ms 3 0ms Picture 4 10 Continuous Operation Mode 4 2 2 Pulse Mode PULSE In this mode when the dynamic testing operation is turned on
53. reliable component it must be tested by the load periodically to ensure the reliability of the battery Capability Test Constant current mode is applied in EL97xx Serial electronic load to test the capability A program is set to control voltage level When the voltage of the battery is too low the electronic load will identify the battery being on the threshold value set or at the margin of insecure state and will stop testing automatically When the load is in testing procedure you can see the battery voltage battery discharge current electronic load power and battery capability that has been spared If the load is connected with PC software then you can 30 Intepro Systems 2012 see the discharge curve of battery discharge This test can test out the reliability and remaining life of battery So it is very necessary to do the test before you change another new battery Operation 1 In standard constant current mode adjust the load current value to the discharge current value of battery required 2 Press the key Shift 8 Battery When VFD display shows END TEST VOLT xxxxxxxxV set the turn off voltage and press the key Enter to start the capability test When the voltage drops to the turn off voltage the load will automatically turn off 3 Press the key On Off to start or to pause the battery capability test 4 Press the key Shift 8 Battery to escape the battery capability test mode V Battery Voltage eeler ee
54. series has a wide application in production line cell phone charger cell phone battery electric vehicle battery Switching power supply linear power supply research institutes automotive electronics aeronautics and astronautics ships solar cells fuel cell etc EL97 series offers users with its novel design rigorous process and attractive cost effectiveness FEATURES Six high speed operation modes CC CR CV CW CC CV CR CV Over current over voltage over power over heat polarity reversed protection High luminance VFD screen with two lines amp four channels display Intellegent fan system fan will be automatically initiated according to the temperature Soft start time setting carrying the power supply according to the voltage value set Battery testing and short circuit function Available for dynamic testing with rising edge falling edge setting Supporting external trigger input and output External current waveform monitor terminal Supporting remote voltage compensation and multidata storage Power on self test software calibration and standard rack mount Communication mode RS232 RS485 USB interface Intepro Systems 2012 Chapter 2 Technical Specifications 2 1 Main Technical Specifications Model Power Input Raitng Chiveat Voltage Range CC Mode Resolution Accuracy Range CV Mode Resolution Accuracy CR Mode Range Voltage and current input Resolution value 210 full Measument Accuracy CW Mod
55. set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round number of 1 200 4 When the VFD display shows STEP 1 CURR xxxxxA indicating the current that requires to be set in the first step press the numeric keys to input the current you want to set in the first step followed by pressing the key Enter to confirm When the VFD display shows STEP 1 TM xxxxx mS indicating the current duration in the first step press the numeric keys to input the current duration you want to set in the first step followed by pressing the key Enter to confirm 5 If all the steps set have been edited the VFD display will show EDIT LIST meaning exit back to the list function If all the steps set have not been edited the VFD display will show S TEP n CURR xxxxxA indicating that data of the N step is being edited Please finish it according to the operation instruction in last step step 4 6 Since list function shares the same storage space with automatic testing function please make sure that the sequential code that you selected in the list function is the same with that in automatic testing function If the sequential code which was defined as automatic testing function before now is defined as list function the automatic testing function of this sequential code will be deleted and cannot be restored 4 2 7 2 Executing List Function Press the k
56. set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 1 2 Loading and Unloading Constant Current Mode Loading and unloading mode can well protect the measured power supply from damage When the voltage of the measured power supply begins to increase the load will automatically adjust itself to the open circuit state and begin to carry the measured power supply and adjust itself to the current value set only when the voltage of the measured power supply has been increased to the ONSET loading voltage When the voltage of the measured power supply begins to decrease and has been decreased to the OFFSET unloading value the load will automatically adjust itself to the open circuit state If the ONSET loading voltage value is higher than the OFFSET unloading voltage value the load can be avoided from frequent carrying and unloading at the critical point of unloading voltage thus the measured power supply can be well protected ON SET OFF SET OFF ON OFF Picture 4 2 Loading and Unloading Mode When in standard constant current mode press the key Shift 1 V_Level and enter into the loading and unloading constant current mode When the VFD display shows ONSET VOL T xxxxxxxxvV indicating t
57. standard constant current mode press the key Shift 5 CR CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CR TO CV VOLT xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant resistance shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR CV or Unreg Showing CR CV means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant resistance mode press the key Shift 5 CR CV the load will back into the standard constant resistance mode 4 1 3 Constant Voltage Operation Mode CV In this mode the electronic load will attempt to sink enough current to control the source voltage to the programmed value Please refer to the picture 4 7 Note When the voltage of the measured power supply is lessen than the voltage value set or the
58. the electronic load will switch to value B as receiving one trigger signal taking the pulse time TWD of value B Load will return to Value A TWD TWD 10ms gt i lt 10ms TRIG TRIG 5A Picture 4 11 Pulse Operation Mode 4 2 3 Trigger Mode TRIGGER In this mode when the dynamic testing operation is turned on the electronic load will switch the state between value A and value B once receiving a triggering signal TRG TRG DATT Picture 4 12 Trigger Operation Mode 4 2 4 Setting up Dynamic testing operation Parameters Press the key Shift 6 S_Tran then the load VFD display shows LEVEL A CURR xxxxxxxxA indicating the current value A set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH A TM xxxxxxxxmsS indicating the current lasting time of current value A set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows RISING TM xxxxxxxxmsS indicating the current rising time set from value A to value B Press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter to confirm Intepro Systems 2012 Then the load VFD display shows LEVEL B CURR xxxxxxxxA indicating the current value B set Press the numeric keys and decima
59. the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC or Unreg Showing CC means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supplier If you want to fine tune the constant current value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value 11 Intepro Systems 2012 Note if the constant current value you want to set is beyond the maximum constant current value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant current value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 1 2 Loading and Unloading Constant Current Mode Loading and unloading mode can well protect the measured power
60. time of soft start In this mode the measured power supply can be avoided from current strike damage Load current Rising Time T Picture 4 3 Soft Start Current Mode When in standard constant current mode press the key Shift 2 S_Start to enter into the soft start constant current mode When the VFD display shows Rising TM xxxxxxxxvmS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_S or Unreg Showing CC_S means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supply In loading and unloading constant current mode press the key Shift 2 S_ Start the load will back into the standard constant current mode Note The rise time set is automatically regulated to be the round number times of 20uS 4 1 1 4 Constant Current Shifting int
61. to change the input state into ON state Then the right upper corner of the VFD display shows ON indicating the current working state 26 Intepro Systems 2012 4 4 Electronic Load Operation Range Electronic load works in the range of Rated Current Rated voltage and Rated Power Please refer to the picture 4 13 and picture 4 14 Picture 4 13 Electronic Load Power Range Electronic load Mode Change Software Maximum Power Set Software Maximum Current Set Picture 4 14 Software Maximum Setting Value 4 5 Protection Functions Electronic load includes the following protection functions 4 5 1 Over Voltage Protection OV If input voltage exceeds the voltage limit load will turn off the input Buzzer will sound and the VFD display shows Over Volt The load maximum voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM UMAX xxxxxxxx Vindicating the current maximum voltage value then enter the maximum 27 Intepro Systems 2012 voltage value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum voltage value of EL97xx electronic load is 150V When it is beyond 150V
62. to confirm the load will get into CONFIG menu press A and Y key button to let the load display CONFIG COMM PARITY press Enter to confirm then the load will display COMM PAR xxxxx you can select the parity check mode by pressing A and Y key button and then press Enter to confirm 4 8 2 Setup Baudrate Press Shift 0 in turn the load will display MENU CONFIG Press Enter to confirm the load will enter into CONFIG menu press A and key button to let the load display CONFIG BAUDRATE SET press Enter to confirm the load will display BUADRATE xxxxx you can choose the appropriate baudrate as you need and press Enter to confirm Totally 6 different baudrate was provided for selection 2400 9600 14400 28800 57600 115200 4 8 3 Data In some data frame the date length is fixed but there are some data frame length is not fixed According to Modbus protocol in the data field all the hex data and floating point number are formed as the High Byte in the former and Low byte in the after Addition the output value of force single coil must be 0x0000 or OxFFOO 0x0000 means OFF while OxFFOO means ON All other values are invalid and will not affect the coil 4 8 4 Function Code Function codes are single byte hex number there are 4 function modes as follows Function Code Description 0x01 Read Coil Status read the data by the bit 0x05 Force Single Coil write the data by the bit 0x03 Read Holding Registers read th
63. too low the electronic load will identify the battery being on the threshold value set or at the margin of insecure state and will stop testing automatically When the load is in testing procedure you can see the battery voltage battery discharge current electronic load power and battery capability that has been spared If the load is connected with PC software then you can see the discharge curve of battery discharge This test can test out the reliability and remaining life of battery So it is very necessary to do the test before you change another new battery Operation 1 In standard constant current mode adjust the load current value to the discharge current value of battery required 31 Intepro Systems 2012 2 Press the key Shift 8 Battery When VFD display shows END TEST VOLT xxxxxxxxV set the turn off voltage and press the key Enter to start the capability test When the voltage drops to the turn off voltage the load will automatically turn off 3 Press the key On Off to start or to pause the battery capability test 4 Press the key Shift 8 Battery to escape the battery capability test mode V Battery Voltage e Min voltage Load Sink Current T Picture 4 16 Battery Capability Schema 4 8 Communication protocol 4 8 1 Introduction EL97 series programmable electronic loads work with Modbus protocol The data frame contains 4 parts as follows Salve Address Function Code Data Error Checki
64. up a Standard Constant Power Mode 19 4 1 4 2 Loading and Unloading Constant Power Mode 19 4 2 Dynamic Testing Operation epee nS inte A ue tated ules Re ale i sero hanes 20 4 2 1 Continuous Mode CONTINUOUS 20 A2 2 Pulse Mode PULGE EE 21 4 2 3 Trigger MOdet TRIGGER EE 21 4 2 4 Setting up Dynamic testing Operation Parameters cececceeeceseeceeeeseeseeeceeseeeeneesees 21 4 2 5 Waveform Contool EE 22 42 3 Sg ate ME 22 429 2 Triangular Wave e eege eer gece 22 4 2 5 3 Trapezoidal Wave ssvccccessseccssiseguaciadenccaveseveuacavsavzcainisvadeasyspaaeeseaeaeennsavaatasdgnadeudbavcavebeasuetedens 22 A226 NEIER 22 42T Bist ee EE 23 SEN E List Operation EE 23 4 2 1 2 Executing last PUNCUOM sieni nnns i ai E seated R ayas 23 Intepro Systems 2012 4 2 8 Automatic Testing Function EE 24 A D6 lc A tom tic KE e 24 4 2 8 2 Setting up Automatic Test Trigger Output Mode 25 4 2 8 3 Executing Automatic Test Function cccsscccssssssssncessscessssscsensccssnascsssaccessscesensecssnensess 26 D lee e EE 26 4 3 1 Short Circuit Operation SHORT eege echte geen 26 4 3 2 lnput On Off OperatlON ss eege errs ee ee 26 4 4 Electronic Load Operation F ert See 27 SE EECHER EH 27 4 5 1 Over Voltage een EEN 27 4 5 2 Over Current Protection OG nef deer ee E 28 4 5 3 Over Power Protectiont Eege eege tinct tue Rebate thet ee 28 4 5 4 Input Polarity Reversed BEE 28 4 5 5 Over Heat e e LE EE 29 4 6 Remote Measurement Funchon 29 4 di Bat
65. will enter into the loading and unloading constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC UN or Unreg Showing CC UN means the load has successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected 12 Intepro Systems 2012 constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the expected constant current value is in the range of the measured power supplier In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant current mode 4 1 1 3 Soft Start Constant Current Mode Soft start constant current mode functions as an inductive load simulating inductance value which is in direct proportion with the rise time of soft start In this mode the measured power supplier can be avoided from current strike damage Load current Rising Time T Picture 4 3 Soft Start Current Mode When in standard constant current mode press the key Shift 2 S_Start to enter into the soft start constant current mode When the VFD display shows Rising TM xxxxxxxxvmsS indicating the current rising time press the numeric
66. work normally Note if the current input state is in OFF state you need to press the key ON OFF to make the load work normally If the over power problem is not solved the load will shows OVER POW again The load maximum power value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM PMAX xxxxxxxxW indicating the current maximum power value then enter the maximum power value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum power value of EL9711 electronic load is 200W When it is beyond 200W it will be automatically adjusted to 200W 4 5 4 Input Polarity Reversed When the electronic load is in input polarity reversed state the buzzer will sound and the VFD display will show REVERSE 29 Intepro Systems 2012 4 5 5 Over Heat Protection OH If internal power component s temperature exceeds 80 C over height protection will be initiated automatically Load will turn off the input and Buzzer will sound and VFD display will show OVERHEAT 4 6 Remote Measurement Function When the load consumes high current the power supply will produce voltage drop in the connecting wire between power supply and load accuracy remot
67. 0 0x13 0x33 0x33 OxFC 0x23 The Corresponding Normal Response 0x01 0x10 O0x0A 0x01 0x00 0x02 0x13 OxDO 4 8 7 Coil With The Register Address Allocation Table 1 Coil bit definition Name Address Bit Property Description PC1 0x0500 1 W R When remote control status bit is 1 front key panel unable PC2 0x0501 1 W R When local prohibition bit is 1 not allow to use key Shift 7 to snatch away the front panel control TRIG 0x0502 1 W R Trigger tagged triggered once by software REMOTE 0x0503 1 W R 1 remote input voltage ISTATE 0x0510 1 R Input status 1 input ON 0 intput OFF TRACK 0x0511 1 R Tracking status 1 voltage tracking 0 current tracking MEMORY 0x0512 1 R 1 input state memory VOICEEN 0x0513 1 R 1 key sound ON OFF CONNECT 0x0514 1 R 1 multi O single ATEST 0x0515 1 R 1 Automatic test mode ATESTUN 0x0516 1 R 1 Automatic test pattern waiting to trigger ATESTPASS 0x0517 1 R 1 success automatic test success 0 automatic test failed IOVER 0x0520 1 R 1 over current tag UOVER 0x0521 1 R 1 over voltage tag POVER 0x0522 1 R 1 over Power tag HEAT 0x0523 1 R 1 over heat tag REVERSE 0x0524 1 R 1 reverse tag UNREG 0x0525 1 R 1 register parameter failed tag ERREP 0x0526 1 R 1 EPPROM error tag ERRCAL 0x0527 1 R 1 calibration data error tag Table 2 Register XRAM area definition Name Address Bit Property Description CMD 0x0A00 1 W R
68. 0 1 19 999V 1 150V 1 19 999V 1 500V CV Mode esolution ImV 10mV mV 10mV ImV 10mV ImV 10mV Accuracy 0 03 0 02 FS 0 03 0 02 FS 03 0 02 FS 0 03 0 05 FS 0 03 0 02 FS 03 0 02 FS 03 0 02 FS 03 0 05 FS CR Mode ange 0 03 2 10K 0 03 2 5K 03 2 10K 0 03 2 5K 0 32 10K 3 Q 5K 03 2 10K 03 2 5K Voltage and 8 8 A 7 7 current input value esolution 16bit 16bit Obit 16bit 16bit 16bit 16bit 16bit 210 full Gegen Accuracy 0 1 0 1 FS 0 1 0 19 0FS 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 1 0 1 FS 1 0 1 FS 1 0 1 FS CW Mode ange 0 600W 0 600W 0 1200W 1200W 1200W 1200W Voltage and current input value esolution ImW 10mW ImW 10mW ImW 10mW 210 full measument Accuracy 0 1 0 1 FS 0 1 0 19 FS 1 0 1 FS 0 1 0 1 FS 0 1 0 19 0FS 1 0 190FS 1 0 190FS 1 0 1 FS Voltage 0 19 999V 0 150V 0 500V 0 19 999V 150V 19 999V 500V V Measurement Resolution ImV 10mV mV 10mV ImV 10mV ImV 10mV Accuracy 0 015 0 03 FS 0 015 0 03 FS 015 0 03 FS 0 015 0 05 FS 0 015 0 03 FS 015 0 03 FS 015 0 03 FS 015 0 05 FS Current 3A 0 24A 240A 6A 60A Heem 1 Resolution OImA Uni Uni mA OImA ID Accuracy 0 05 0 05 FS 0 1 0 08 FS 03 0 05 FS 0 03 0 08 FS 0 05 0 05 FS 1 0 190FS 03 0 05 FS 03 0 08 FS W Measurement Watt 100W 600W 100W 600W 100W 1200W 100W 1200W Voltage and 3 current input value Resolution ImW 10mW ImW 10mW ImW 10mW ImW 10mW 210 full measument Accuracy 0 1 0 19 FS 0 1 0 19 0FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 F
69. 03 Q 10K 0 039 5K 0 3 Q 10K 0 3 9 5K 0 03 Q 10K 0 03 9 5K ERRERA EE FEAI10 Accuracy 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS CW Mode Range 0 3600W 0 3600W 0 3600W 0 3600W 0 3600W 0 6000W 0 6000W 0 6000W an Rein mw iow Um Dm a GHA EAL Resolution 1mW 10mW 1mW 10mW 10mW ImW 10mW LRU gt ie FEAI10 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS Battery Measruement WOR Op Dynamic Measurement 2 CC soft startup Time FAB E SI Short Circuit D Temperature Nonoperating Dimension W H D mm Weight Kg Wide 10 C 70 C Transition List 0 25kKHZ 5A uS T1 amp T2 60uS 999S Accuracy 15 offset 10 FS nam OS Cc 575 465 355 70 UN EE Re Operating 0 40 C 0 40 C 10 C 70 C 10 C 70 C Voltage 0 19 999V 0 150V 0 19 999V 0 500V 0 19 999V 0 150V 0 19 999V 0 500V See ution In 10mV 1mV 10mV 1mV 10mV 1mV 10mV racy 0 015 0 03 FS 0 015 0 03 FS 0 015 0 03 FS 0 015 0 05 FS 0 015 0 03 FS 0 015 0 03 FS 0 015 0 03 FS 0 015 0 05 FS 0 120A I Measurement Sa ImA BAME 0 03 0 08 FS 0 1 0 08 FS 0 03 0 08 FS 0 1 0 08 FS 0 03 0 08 FS 0 1 0 08 FS 0 03 0 08 FS 0 1 0 08 FS Ww 100W 3600W 100W 3600W 100W 60000W 100W 6000W Measurement Hang all SA RAL ARESE met Accuracy 0 1 0 1 FS 0 1 0 1 ES 0 1 0 1 FS 0 1 0 1 FS 0 1 40 1 FS 0 1 0 1 FS 0
70. 0K 03 2 5K 0 3 10K 0 3 9 5K 0 03 2 10K 0 03 2 5K Voltage and s S 7 l i current input Resolution 16bit 16bit 16bit 16bit 16bit 16bit 16bit 16bit value 210 full measument Accuracy 1 0 1 FS 1 0 1 FS 0 1 0 1 FS 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS CW Mode Range 150W 150W 0 300W 0 300W 0 300W 0 300W 0 300W 0 300W Voltage and current input Resolution ImW mW ImW 10mW ImW 10mW ImW 10mW value 210 full measument Accuracy 1 0 1 FS 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS Voltage 0 150V 0 19 999V 0 150V 0 19 999V 0 500V 0 19 999V 0 150V V Measurement Resolution Jm 10mV Jm 10mV ImV 10mV Jm 10mV Accuracy 0 015 0 03 FS 0 015 0 03 FS 0 015 0 02 FS 0 015 0 03 FS 0 015 0 03 FS 0 015 0 05 FS 0 015 0 03 FS 0 015 0 03 FS Current 0 3A 0 30A 0 3A 0 30A 0 3A 0 15A 0 6A 0 60A TMeaswrement Resolution Jaen Uni Viet HE 0 01mA HE Uni imA Accuracy 0 03 0 05 FS 0 03 0 08 FS 0 03 0 05 FS 0 03 0 08 FS 0 03 0 05 FS 0 03 0 08 FS 0 03 0 05 FS 0 03 0 08 FS W Measurement Watt 100W 150W 100W 300W 100W 300W 100W 300W Voltage and 7 current input Resolution ImW 10mW ImW 10mW ImW 10mW ImW 10mW value 210 full measument Accuracy 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS Battery Measruement Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Dynamic Measurement Transition List 0
71. 0x0524 1 R 1 reverse tag UNREG 0x0525 1 R 1 register parameter failed tag ERREP 0x0526 1 R 1 EPPROM error tag ERRCAL Ox0527 1 R 1 calibration data error tag Table 2 Register XRAM area definition Name Address Bit Property Description CMD OxO0A00 1 W R Command Register lower 8 bits effective high 8 bits meaningless IFIX Ox0A01 2 W R Constant current register double type UFIX Ox0A03 2 W R Constant voltage register double type PFIX Ox0A05 2 W R Constant power register double type RFIX 0x0A07 2 W R Constant resistance register double type TMCCS Ox0A09 2 W R Current soft start rising time register double type TMCVS OxOAOB 2 W R Voltage soft start rising time register double type 38 Intepro Systems 2012 UCCONSET OxOAOD 2 W R Constant current load voltage register double type UCCOFFSET OxOAOF 2 W R constant current unload voltage register double type UCVONSET Ox0A11 2 W R Constant voltage load voltage register double type UCVOFFSET 0x0A13 2 W R Constant voltage unloaded voltage regi double type UCPONSET 0x0A15 2 W R Constant power load voltage register double type UCPOFFSET Ox0A17 2 W R Constant power unload voltage register doubl type UCRONSET Ox0A19 2 W R Constant resistance load voltage register double type UCRO
72. 1 0 1 FS 0 1 0 1 FS 0 2400W ImW 0 1 0 1 FS 0 015 0 03 FS 0 03 0 05 0FS ImW 0 1 0 1 FS 0 1 0 1 FS 0 2400W 10mW 0 1 0 1 FS 0 015 0 03 FS 0 1 0 05 FS 10mW 0 1 0 1 FS Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Transition List 0 25kHZ 5A uS T1 amp T2 60uS 999S Accuracy 15 offset 10 FS 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS 52644 IN 56mQ 0 40 C 10C 70T 13 2A 264A V IN 550m 2 Ko 0 40 C 0 40C 10 C 70 100 700 207 428 453 5 31 6 5 132A 0 1 0 1 FS 0 2400W 0 2400W 0 1 0 1 FS 0 1 0 1 FS 1 0 1 FS 150V 19 999V 0 500V 0 19 999V 0 150V 0 19 999V 500V 015 0 03 FS 0 015 0 03 F 015 0 05 F S s 240A 12A 0 120A 0 24A 0 240A 0 12A 120A ImA ImA ImA 0 1mA ImA 0 1mA ImA 1 0 05 FS 1800W OW 1800W 100W 2400W 100W 2400W mW 0 03 0 05 FS 0 1 0 05 FS ImW 10mW 0 1 0 1 FS 0 1 0 1 FS 132A IN 550m U 0 40 C 100 70 C Intepro Systems 2012 CECR ER EE Ge CC Mode 0 05 0 1 FS 0 05 0 15 FS CV Mode 0 03 0 02 FS CR Mode Ee input value 210 full Accuracy 0 1 0 1 FS 0 1 0 1 FS measurement CW Mode 0 3000W 0 3000W Voltage and current input value 210 full Accuracy 0 1 0 1 FS 0 1 0 1 FS measurement 0 015 0 03 FS 0 015 0 03 FS EEN input value 2
73. 1 R Model Register u16 type EDITION 0x0B07 1 R software version number register u16 type 4 8 8 The Definition Of The Command Register CMD Definition CMD Value Description CC 1 CV 2 CW 3 CR 4 CC Soft Start 20 Dynamic Mode 25 Short Circuit Mode 26 List Mode 27 CC Loading And Unloading Mode 30 CV Loading And Unloading Mode 31 CW Loading And Unloading 32 Mode CR Loading And Unloading Mode 33 CC Mode Switch To CV Mode 34 CR Mode Switch To CV Mode 36 Battery Test Mode 38 CV Soft Start 39 Changin System Parameters 41 Input ON 42 Input OFF 43 4 8 9 Common Operation Function Description Table 1 Remote Control Operation Operation Register Value Description Force Single Coil PC1 1 mandatory Table 2 cancel remote control operation Operation Register Value Description Force Single Coil PC1 0 mandatory 38 Intepro Systems 2012 Table 3 Local Prohibition control operations Table 4 Operation Register Value Description Force Single Coil PC2 1 mandatory Local allows the operator to Operation Register Value Description Force Single Coil PC2 0 mandatory Table 5 Input ON operation Operation Register Value Description Preset CMD 42 mandatory Mul
74. 10 full Accuracy 0 1 0 25 FS 0 2 0 35 FS measurement Battery Measurement Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Dynamic Measurement Transition List 0 25kKHZ 2 5A uS T1 amp T2 60uS 999S Accuracy 15 offset 10 FS CC soft startup Time 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS SEN Short Cirouit _Vvottage Cv Resistance CR Operating 0 40 C Temperature Nonoperating 10 C 70 C W H D mm 207 428 453 5 Weight Intepro Systems 2012 2 2 Electronic Load Dimension Dimension of models EL9715 EL9715B EL9716 EL9716B EL9716E 428mmH 207mmW 453 5mmD Intepro Systems 2012 Chapter 3 Quick Reference 3 1 Power on self test Verify that you have received the following items with your power supply If anything is missing contact your nearest Sales Office One power cord for your location The user s manual One CD only when you have bought communication accessories One communication cable only when you have bought communication accessories At first please make sure the electronic load has been correctly connected and powered on Please refer to the following for the detailed operation steps Procedure Display Explanation The electronic load start power on self test 1 Power on the SYSTEM SELF TEST and the VFD display shows the so
75. 2012 Force Single Coil PC2 1 mandatory Table 4 Local allows the operator to Operation Register Value Description Force Single Coil PC2 0 mandatory Table 5 Input ON operation Operation Register Value Description Preset CMD 42 mandatory Multi Registers Table 6 Input OFF operation Operation Register Value Description Preset CMD 43 mandatory Multi Registers Table 7 Short circuit operation Operation Register Value Description Preset CMD 26 mandatory Multi Registers Table 8 CC mode operation Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset CMD 1 mandatory Multi Registers Table 9 CV mode operation Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset CMD 2 mandatory Multi Registers Table 10 CW mode operation Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset CMD 3 mandatory Multi Registers Table 11 CR mode operation Operation Register Value Description Preset RFIX Double Optional 40 Intepro Systems 2012 Multi Registers Preset CMD 4 mandatory
76. 4 CRC Error Check 2 A value of OxFFO0 forces the coil to be ON and 0x0000 forces the coil to be turned OFF All other values are invalid and will not affect the coil For example The following example sets the load is in remote control at slave device address 0x01 From table 4 8 7 1 we know that the PC1 remote address is 0x0510 Query 0x01 0x05 0x05 0x00 OxFF 0x00 Ox8C OxF6 The Correponding Response 0x01 0x05 0x05 0x00 OxFF 0x00 Ox8C OxF6 3 Read Holding Registers 0x03 Read Holding Registers Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Starting Address 2 0 OxFFFF No of Points 2 n 1 32 CRC Error Check 2 Read Holding Registers Example Nomal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Byte Count 1 2 n Data 2 n CRC Error Check 2 Read Holding Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 35 Intepro Systems 2012 Function Code 1 0x83 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example reads the present voltage value at slave device address 0x01 From table 4 8 7 1 we know that the register address of the present voltage value is 0x0B0O0 Query 0x01 0x03 0x0B 0x00 0x00 0x02 OxC6 0x2F The Corresponding Nomal Response
77. 5 3 Over Power Protection OW When input power exceeds the power limit buzzer will sound and VFD display will show OVER POW Users need to press any key to get the load work normally Note if the current input state is in OFF state you need to press the key ON OFF to make the load work normally If the over power problem is not solved the load will shows OVER POW again The load maximum power value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM PMAX xxxxxxxxW indicating the current maximum power value then enter the maximum power value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum power value of EL9711 electronic load is 300W When it is beyond 300W it will be automatically adjusted to 300W 4 5 4 Input Polarity Reversed When the electronic load is in input polarity reversed state the buzzer will sound and the VFD display will show REVERSE 4 5 5 Over Heat Protection OH If internal power component s temperature exceeds 800 over height protection will be initiated automatically Load will turn off the input and Buzzer will sound and VFD display will show OVERHEAT 29 Intepro Systems 2012 4 6 Remote
78. AX VOLTAGE SET Setting the maximum Voltage If the maximum voltage is higher than 20V it is high range Otherwise it is low range MAX POWER SET Setup the Maximum Power TERMINAL SEL Choosing the input terminal FRONT Choose the input terminal at the front panel BACK Choose the input terminal at the back panel EXIT LIST LOAD LIST Choose list files 1 8 EDIT LIST Edit list files MINIMUM TIME Edit minimum time 0 02 1310 7mS LIST MODE LIST output mode CONTINUOUS Continuous mode END HOLD Remains to the last output voltage level after the whole steps are executed successfully END RESET Keep load off state after the whole steps are executed successfully STEP LENGTH Step length 1 200 STEP n 1 whole step length Intepro Systems 2012 CURRENT Set current TIME Duration EXIT AUTO TEST LOAD AUTO TEST Choose automatic test files 1 8 EDIT AUTO TEST Edit automatic test files STEP LENGTH Set the whole step length STEP n WORK MODE LOAD OFF MODE Load off mode CC MODE Constant current mode CV MODE Constant voltage mode CP MODE Constant power mode CR MODE Constant resistance mode SHORT MODE Short circuit mode TEST MODE Qualification testing mode TEST CURRENT Test current TEST VOLTAGE Test voltage TEST POWER Test power TEST RESI Test resist
79. B Ox0A23 2 W R dynamic mode B phase current register double type TMAWD Ox0A25 2 W R dynamic mode A pulse width registers double type TMBWD Ox0A27 2 W R dynamic mode B pulse width registers double type TMTRANRIS Ox0A29 2 W R Dynamic mode rising time register r double type TMTRANFAL 0x0A2B 2 W R Dynamic model falling time register double type MODETRAN Ox0A2D 1 W R Dynamic mode register u16 type UBATTEND Ox0A2E 2 W R Battery Test termination voltage register double type BATT 0x0A30 2 W R Battery capacity register double type SERLIST 0x0A32 1 W R LIST serial number register u16 type SERATEST 0x0A33 1 W R Automatic Test serial number register u16 type IMAX 0x0A34 2 W R Current maximum register double type UMAX 0x0A36 2 W R Voltage maximum register double type PMAX 0x0A38 2 W R Power maximum register double type ILCAL Ox0A3A 2 W R Calibration current low end target value double type IHCAL 0x0A3C 2 W R Current high end calibration target value 37 Intepro Systems 2012 double type ULCAL Ox0A3E 2 W R Voltage low end calibration target value double type UHCAL 0x0A40 2 W R Voltage high end calibration target value double type TAGSCAL Ox0A42 1 W R Calibration state tag u16 type U 0x0B00 2 R Voltage Register double type 0x0B02 2 R Current Register double type SETMODE 0x0B04 1 R Operation Mode register u16e type INPUTMODE 0x0B05 1 R Input Status Register u16 type MODEL 0x0B06
80. Communication between Power Supply and PC The DB9 interface connector on the rear panel of the electronic load can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 The following instructions can help you understand how to control the output of power supplier by PC 1 RS232 Setting Before using the remote operation mode please make sure that the baudrate and communication address in power supplier are the same as that in the computer software otherwise the communication will fail You can change the baud rate and communication address from the front panel or from computer 1 Baud rate 9600 4800 9600 19200 38400 which are selectable from the menu on the front panel 43 Intepro Systems 2012 2 Data bit 8 3 Stop bit 1 4 Parity none even odd 2 DB9 Serial Interface DB9 Serial Interface 1 5V 2 TXD 3 RXD 5 GND The output of DB9 interface on the rear panel of the power supplier is TTL voltage level so the voltage level shift cable M 131 or M133 must be applied before connecting the DB9 interface with the serial interface on PC M 131 Voltage Level Shift Cable PC 44 Intepro Systems 2012 VC TX NC GN NC NC NC NC O OO JO OUPWN FE O OO JO OG GA b i M 133 Voltage Level Shift Cable PC i Z J E d E 5 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of comput
81. EC Min voltage Load Sink Current T Picture 4 16 Battery Capability Schema 4 8 Communication protocol 4 8 1 Introduction EL97 series programmable electronic loads work with Modbus protocol The data frame contains 4 parts as follows Salve Address Function Code Data Error Checking CRC To make sure high reliability for the communication we need to set the frame pitch greater than 3 5 times of the transient time of single bit byte Eg When the baud rate is 9600 then the frame pitch time must be greater than 11 3 5 9600 0 004s 31 Intepro Systems 2012 EL97 series programmable electronic loads provided with double way asynchronous communication fixed 1 bit as the start bit 8 data bit and 1 stop bit Support Non parity check Odd Parity check and even parity check Baudrate could be selected as 2400 9600 14400 28800 57600 115200 1 Setup additional address and communication parameter The additional address is a single byte with 16 hexadecimal system data EL97 series electronic loads will only response the request data frame which has the same additional address 2 Setup the additional address Press Shift 0 in turn Enter into the Main Menu the Load will display as MENU CONFIG Press the key Enter to confirm then the load get into CONFIG Menu press A and key button to let the load display CONFIG ADDRESS SET then press Enter to confirm the load will display ADDRESS ADDR xxx
82. END HOLD means the electronic load will remain the last value you set in the last step when all the steps you set in one set of data have been successfully executed LIST END RESET means the electronic load will reset to be load off mode when all the steps you set in one set of data have been successfully executed 3 After pressing the key Enter to confirm the VFD display will show STEP LENG xxx indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round number of 1 200 4 When the VFD display shows STEP 1 CURR xxxxxA indicating the current that requires to be set in the first step press the numeric keys to input the current you want to set in the first step followed by pressing the key Enter to confirm When the VFD display shows STEP 1 TM xxxxx mS indicating the current duration in the first step press the numeric keys to input the current duration you want to set in the first step followed by pressing the key Enter to confirm 5 If all the steps set have been edited the VFD display will show EDIT LIST meaning exit back to the list function If all the steps set have not been edited the VFD display will show STEP n CURR xxxxxA indicating that data of the N step is being edited Please finish it according to the operation instruction in last step step 4 6 Since list function s
83. FFSET 0x0A1B 2 W R Constant resistance unload voltage register double type UCCCV OxOA1D 2 W R constant current shift constant voltage register double type UCRCV OxOAIF 2 W R Constant resistance shift constant voltage register double type IA Ox0A21 2 W R dynamic mode A phase current register double type IB Ox0A23 2 W R dynamic mode B phase current register double type TMAWD Ox0A25 2 W R dynamic mode A pulse width registers double type TMBWD Ox0A27 2 W R dynamic mode B pulse width registers double type TMTRANRIS Ox0A29 2 W R Dynamic mode rising time register r double type TMTRANFAL 0x0A2B 2 W R Dynamic model falling time register double type MODETRAN Ox0A2D 1 W R Dynamic mode register u16 type UBATTEND OxOA2E 2 W R Battery Test termination voltage register double type BATT Ox0A30 2 W R Battery capacity register double type SERLIST Ox0A32 1 W R LIST serial number register u16 type SERATEST Ox0A33 1 W R Automatic Test serial number register u16 type IMAX Ox0A34 2 W R Current maximum register double type UMAX Ox0A36 2 W R Voltage maximum register double type PMAX Ox0A38 2 W R Power maximum register double type ILCAL Ox0A3A 2 W R Calibration current low end target value double type IHCAL Ox0A3C 2 W R Current high end calibration target value double type Intepro Systems 2012
84. Force Data Coil Status 2 0x0000 or xFFOO CRC Error Check 2 Force Single Coil Example Normal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Coil Address 2 0 OxFFFF Force Data Coil Status 2 0x0000 or OxFFOO CRC Error Check 2 33 Intepro Systems 2012 Force Single Coil Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 0x85 Abnormal Code 01 04 CRC Error Check 1 1 2 A value of OxFFOO forces the coil to be ON and 0x0000 forces the coil to be turned OFF All other values are invalid and will not affect the coil For example The following example sets the load is in remote control at slave device address 0x01 From table 4 8 7 1 we know that the PC1 remote address is 0x0510 Query 0x01 0x05 0x05 0x00 OxFF 0x00 Ox8C OxF6 The Correponding Response 0x01 0x05 0x05 0x00 OxFF 0x00 0x8C OxF6 3 Read Holding Registers 0x03 Read Holding Registers Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Starting Address 2 0 OxFFFF No of Points 2 n 1 32 CRC Error Check 2 Read Holding Registers Example Nomal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Byte Count 1 2 n Data 2 n CRC Error Check 2 Re
85. IX is 2 3A at slave device address 0x01 36 Intepro Systems 2012 From table 4 8 7 1 we know that the IFIX register address is Ox0A01 the floating point takes up two word length Query 0x01 0x10 0x0A 0x01 0x00 0x02 0x04 0x40 0x13 0x33 0x33 OxFC 0x23 The Corresponding Normal Response 0x01 0x10 0x0A 0x01 0x00 0x02 0x13 OxDO 4 8 7 Coil with the Register Address Allocation Table 1 Coil bit definition Name Address Bit Property Description PC1 O0x0500 1 W R When remote control status bit is 1 front key panel unable PC2 0x0501 1 W R When local prohibition bit is 1 not allow to use key Shift 7 to snatch away the front panel control TRIG Ox0502 1 W R Trigger tagged triggered once by software REMOTE 0x0503 1 W R 1 remote input voltage ISTATE 0x0510 1 R Input status 1 input ON 0 intput OFF TRACK 0x051 1 1 R Tracking status 1 voltage tracking O current tracking MEMORY 0x0512 1 R 1 input state memory VOICEEN 0x0513 1 R 1 key sound ON OFF CONNECT 0x0514 1 R 1 multi O single ATEST 0x0515 1 R 1 Automatic test mode ATESTUN Ox0516 1 R 1 Automatic test pattern waiting to trigger ATESTPASS Ox0517 1 R 1 success automatic test success 0 automatic test failed IOVER 0x0520 1 R 1 over current tag UOVER 0x0521 1 R 1 over voltage tag POVER 0x0522 1 R 1 over Power tag HEAT 0x0523 1 R 1 over heat tag REVERSE
86. Intepro Systems 2012 USER MANUAL Models EL97 Series Programmable DC Electronic Load Including EL9711 EL9712 EL9712B EL9712C EL9712B30 Intepro Systems 2012 Intepro Systems 2012 Content USER MANUAL see ee ergett ee deat elt tn a ae EECHER dE i Chapter a 1 Chapter 2 Technical Specifications c cccccceceeececeeceeeeeeeeeeeeceaeeeaeeseeeseeeseaeseaeeeaaeeaaeseaeseaeseaeeeaeeseesaeeeeeeeeeaees 2 2 1 Main Technical Specifications cccccecceeceeeeceeeceeeceeeeeeeeeeceaeeaeeceeeseeeseeeeeaeeeeeeeceeseaeeeaeseaeeeeeseeeeaeeesaees 2 2 2 Electronic L ad Dipeneien 5200 a a aara AE PER EE AASE AREE AA A EOAR ATO 4 2 3 Environmental Conditions EE 4 Chapter 3 Q ick Referente eege cee eld ani i A iG Ae ivi indie lenis ae ele 5 3 1 ower or Set Ieet 2120 d testinal dade evel deer 5 3 2 I CaSe ei Nell EE 5 3 3 Front Panel Operation i 4c casieistieguvcis asl as aa anaa stele aoe tenet naval EELER Se EE 6 3 4 Standard Display EE 7 3 0 Keypad RR e EE 7 3 6 M Operati aas ar neare REES ee abecedueznacecad qusseScguaepemdspuaadbste eatagateacagesenesanbenes 8 Chapter 4 Panel Operation cccceccceccecseeeececeeeceeeceneeeneeseeeeaeseaaeeaaessaeeaeseaeseaeseaaeeaaessaeseaeseaeseaeeeaeesaeeseeeeesaas 11 4 1 Basic Operation MOJE iien ccs erciaeesladerevtee vadtevarMeadestlvaneedestee de a adara a aaar aei araia eetan idles 11 4 1 1 Constant Current Operation Mode CC 11 4 1 1 1 Setting up a Standard Constant Current
87. ODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CV Mode CV MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CP Mode CP MODE Choose one of four types current comparison voltage comparison power comparison and 24 Intepro Systems 2012 resistance comparison CR Mode CR MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison Short Circuit SHORT MODE Compare the current when in short circuit mode Mode 4 When the VFD display shows STEP 1 TEST xxxx indicating the test types There are four test types test current test voltage test power test resistance Press the A and YW keys to select one from those four types followed by pressing the key Enter to confirm If in last step step 3 you choose load off mode or short circuit mode then the electronic load will skip step 4 5 When the VFD display shows DELAY TM xx xS indicating the delay time of each step The valid range of the delay time is 0 1 25 5S The lower value you set the shorter time the test needs But in certain circumstances too lower value may affect the test results because the test has been finished before the power supply reaches static state so please carefully select the delay time you wanted t
88. Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRONSET Double Optional Multi Registers Preset UCROFFSET Double Optional Multi Registers Preset CMD 33 mandatory Multi Registers Table 18 CC mode switch to CV mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCCV Double Optional Multi Registers Preset CMD 34 mandatory Multi Registers Table 19 CR mode switch to CR mode Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRCV Double Optional Multi Registers Preset CMD 35 Must select Multi Registers Table 20 battery test mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UBATTEND Double Optional Multi Registers Preset CMD 38 mandatory Multi Registers Table 21 Dynamic Test Mode Operation Register Value Description 41 Intepro Systems 2012 Preset IA Double Optional Multi Registers Preset IB Double Optional Multi Registers Preset TMAWD Double Optional Multi Registers Preset TMBWD Double Optional Multi Registers Preset TMTRANRIS Double Optional Multi Registers Preset TMTRANFAL Double Optional Multi Registers Preset MODETRAN 0 2 Optional Multi Registers Preset CMD 25 mandatory Multi Registers Table 22 System parameter setting mode Operation Register Value Description Prese
89. Registers Table 8 CC mode operation Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset CMD 1 mandatory Multi Registers Table 9 CV mode operation Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset CMD 2 mandatory Multi Registers Table 10 CW mode operation Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset CMD 3 mandatory Multi Registers Table 11 CR mode operation Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset CMD 4 mandatory Multi Registers Table 12 CC mode soft start 40 Intepro Systems 2012 Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset TMCCS Double Optional Multi Registers Preset CMD 20 mandatory Multi Registers Table 13 CV mode soft start Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset TMCVS Double Optional Multi Registers Preset CMD 39 mandatory Multi Registers Table 14 CC loading and unloading mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCONSET Double Optional Multi Registers Preset UCCOFFSET Double Optional Multi Registers Preset CMD 30 mandatory
90. S 0 1 0 1 FS 0 1 0 1 FS 0 1 0 1 FS Battery Measurement Battery Input 0 5 120V Max Measurement Capacity 999 H Resolution 0 1mA Time Range 1S 16HS Dynamic Measurement Transition List 0 25kKHZ 2 5A uS T1 amp T2 60uS 999S Accuracy 15 offset 10 FS CC soft startup Time 1 mS 2 mS 5mS 10mS 20 mS 50 mS 100 mS 200 mS Accuracy 15 offset 10 FS Current CC 264A 5 264A 6 6A 66A Short Circuit Voltage CV o oy Su ef 100m2 7m0 50m Operating 0 40 C 0 40 C 0 40 0 40 C Temperature Nonoperating 10C 70 C 100 70 C 10C 70 C 10C 0 Dimension 103 5 428 453 5 Weight 17 6 Intepro Systems 2012 2 2 Electronic Load Dimension Dimension of models EL9713 EL9713B EL9714 EL9714B 428mmH 103 5mmW 453 5mmD 428 A0 EEL Gees G 441 8 Intepro Systems 2012 Chapter 3 Quick Reference 3 1 Power on self test Verify that you have received the following items with your power supply If anything is missing contact your nearest Sales Office t One power cord for your location The user s manual One CD only when you have bought communication accessories One communication cable only when you have bought communication accessories At first please make sure the electronic load has been correctly connected and powered on Please refer to the following for the detailed operation steps
91. ST RESI Test resistance DELAY TIME Test delay time 0 2 25 5S INPUT xxxx Input the parameters set for example CC mode 1A MINIMUM xxxx Input the minimum lower limit MAXIMUM xxxx Input the maximum upper limit SETUP AUTO TEST TRIGGER Trigger output selection WHEN PASS Trigger once when passing the test WHEN FAIL Trigger once when failing the test WHEN TEST END Trigger output is initiated when test Intepro Systems 2012 ends DISABLE Disable trigger output OUTPUT Output electrical characteristics selection PULSE Pulse output LEVEL Voltage level output EXIT EXIT Intepro Systems 2012 Chapter 4 Panel Operation 4 1 Basic Operation Mode There are four operation modes for electronic load 1 Constant current CC 2 Constant voltage CV 3 Constant resistance CR 4 Constant power CW 5 Constant current shifting into constant voltage mode CC CV 6 Constant resistance shifting into constant voltage mode CR CV 4 1 1 Constant Current Operation Mode CC In this mode the electronic load will sink a current in accordance with the programmed value regardless of the input voltage Please refer to the picture 4 1 If maximum current value of the measured power supplier is lessen than the constant current value set the electronic load might fail to adjust itself to the constant current and the voltage of the measured power supply could be changed to be low I Curre
92. T END HOLD and LIST END RESET Press the A and YW keys to select one output mode you wanted followed by pressing the key Enter to confirm LIST CONTINOUS means continuous output mode LIST END HOLD means the electronic load will remain the last value you set in the last step when all the steps you set in one set of data have been successfully executed LIST END RESET means the electronic load will reset to be load off mode when all the steps you set in one set of data have been successfully executed 3 After pressing the key Enter to confirm the VFD display will show STEP LENG xxx indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round number of 1 200 4 When the VFD display shows STEP 1 CURR xxxxxA indicating the current that requires to be set in the first step press the numeric keys to input the current you want to set in the first step followed by pressing the key Enter to confirm When the VFD display shows STEP 1 TM xxxxx mS indicating the current duration in the first step press the numeric keys to input the current duration you want to set in the first step followed by pressing the key Enter to confirm DI all the steps set have been edited the VFD display will show EDIT LIST meaning exit back to the list function If all the steps set have not been edited the VFD
93. Then the VFD will shows OFFSET VOL T xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR_UN or Unreg Showing CR_UN means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supplier is in the range of the current value that the expected resistance can absorb In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant resistance mode 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode A I gt U Picture 4 6 Constant Resistance Shifting into Constant Voltage Mode In constant resistance shifting into constant voltage mode the measured power supplier can be avoided from current strike damage When
94. Then the VFD will shows OFFSET VOLT xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR_UN or Unreg Showing CR_UN means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supply is in the range of the current value that the expected resistance can absorb Intepro Systems 2012 In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant resistance mode 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode A I Picture 4 6 Constant Resistance Shifting into Constant Voltage Mode In constant resistance shifting into constant voltage mode the measured power supply can be avoided from current strike damage When in
95. ULSE In this mode when the dynamic testing operation is turned on the electronic load will switch to value B as receiving one trigger signal taking the pulse time TWD of value B Load will return to Value A 5A TWD H TWD 10ms lt 10ms gt TRIG TRIG Picture 4 11 Pulse Operation Mode 4 2 3 Trigger Mode TRIGGER In this mode when the dynamic testing operation is turned on the electronic load will switch the state between value A and value B once receiving a triggering signal DAT R TRG TRG Picture 4 12 Trigger Operation Mode 4 2 4 Setting up Dynamic testing operation Parameters Press the key Shift 6 S_Tran then the load VFD display shows LEVEL A CURR xxxxxxxxA indicating the current value A set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH A TM xxxxxxxxmS indicating the current lasting time of current value A set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows RISING TM xxxxxxxxmS indicating the current rising time set from value A to value B Press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter to confirm Then the load VFD display shows LEVEL B CURR xxxxxxxxA indicating the current value B set Press th
96. YSTEM PMAX xxxxxxxxW indicating the current maximum power value then enter the maximum power value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum power value of EL9711 electronic load is 300W When it is beyond 300W it will be automatically adjusted to 300W 4 5 4 Input Polarity Reversed When the electronic load is in input polarity reversed state the buzzer will sound and the VFD display will show REVERSE 28 Intepro Systems 2012 4 5 5 Over Heat Protection OH If internal power component s temperature exceeds 80 C over height protection will be initiated automatically Load will turn off the input and Buzzer will sound and VFD display will show OVERHEAT 4 6 Remote Measurement Function When in CV CR and CP mode if load consumes high current the power supplier will produce voltage drop in the connecting wire between measured power supplier and load terminals In order to guarantee the measurement accuracy remote measurement terminals is installed at the rear panel of the electronic load Users can measure the output terminals voltage of measured power supplier by these terminals The remote measurement function can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down key
97. ad Holding Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 0x83 Abnormal Code 01 04 CRC Error Check 1 1 2 For example The following example reads the present voltage value at slave device address 0x01 From table 4 8 7 1 we know that the register address of the present voltage value is OxOBOO Query 0x01 0x03 0x0B 0x00 0x00 0x02 OxC6 0x2F The Corresponding Nomal Response 0x01 0x03 0x04 0x41 0x20 0x00 0x2A Ox6E 0x1A among which 0x41 0x20 0x00 Ox2A is the read back voltage value the corresponding floating point number is 10V 34 4 Preset Multiple Registers 0x10 Preset Multiple Registes Example Query Intepro Systems 2012 Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 n 1 32 Byte count 1 2 n Preset Data 2 n CRC Error Check 2 Preset Multiple Registers Example Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 N CRC Error Check 2 Preset Multiple Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 0x90 Abnormal Code 01 04 CRC Error Check 1 1 2 For example The fo
98. ad get into CONFIG Menu press A and key button to let the load display CONFIG ADDRESS SET then press Enter to confirm the load will display ADDRESS ADDR xxx you can change the address number by press the numeric keys and press the key Enter again to confirm Note The valid additional address number is integers in the range of 1 200 3 Select the check mode Press Shift 0 in turn enter into the main Menu the load will display MENU CONFIG press the key Enter to confirm the load will get into CONFIG menu press A and Y key button to let the load display CONFIG COMM PARITY press Enter to confirm then the load will display COMM PAR xxxxx you can select the parity check mode by pressing A and key button and then press Enter to confirm 4 8 2 Setup Baudrate Press Shift 0 in turn the load will display MENU CONFIG Press Enter to confirm the load will enter into CONFIG menu press A and Y key button to let the load display CONFIG BAUDRATE SET press Enter to confirm the load will display BUADRATE xxxxx you can choose the appropriate baudrate as you need and press Enter to confirm Totally 6 different baudrate provided for selection 2400 9600 14400 28800 57600 115200 4 8 3 Data In some data frame the date length is fixed but there are some data frame length is not fixed According to Modbus protocol in the data field all the hex data and floating point number are formed as the High Byte in the former and Low byte in the
99. adays As to any battery used either in sheltered equipment or in the uninterrupted service system it is necessary to use the load testing Because the battery is the lowest reliable component it must be tested by the load periodically to ensure the reliability of the battery Capability Test Constant current mode is applied in EL9711 Serial electronic load to test the capability A program is set to control voltage level When the voltage of the battery is too low the electronic load will identify the battery being on the threshold value set or at the margin of insecure state and will stop testing automatically When the load is in testing procedure you can see the battery voltage battery discharge current electronic load 31 Intepro Systems 2012 power and battery capability that has been spared If the load is connected with PC software then you can see the discharge curve of battery discharge This test can test out the reliability and remaining life of battery So it is very necessary to do the test before you change another new battery Operation 1 In standard constant current mode adjust the load current value to the discharge current value of battery required 2 Press the key Shift 8 Battery When VFD display shows END TEST VOLT xxxxxxxxV set the turn off voltage and press the key Enter to start the capability test When the voltage drops to the turn off voltage the load will automatically turn off 3 Press the key
100. after Addition the output value of force single coil must be 0x0000 or OxFFOO 0x0000 means OFF while OxFFOO means ON All other values are invalid and will not affect the coil 4 8 4 Function Code Function codes are single byte hex number there are 4 function modes as follows Function Code Description 0x01 Read Coil Status read the data by the bit 0x05 Force Single Coil write the data by the bit 0x03 Read Holding Registers read the data by the word 0x10 Preset Multiple Registers write the data by the word 33 Intepro Systems 2012 4 8 5 Error checking CRC EL97 series load use the Cyclic Redundancy Check CRC The CRC field checks the contents of the entire message The CRC fileld is two bytes containing a 16 bit binary value When the CRC ia appended to the message the low order byte is appended first followed by the high order byte The discipline is as follows a b Setup one hex CRC register and give the initial value as OXFFFF Make bitxor for the first byte of the frame date and the lower 8 bit of the CRC register And save the bitxor result into the CRC register Right move CRC register for 1 byte and check the if the lowest bit is 1 if the lowest bit is 1 and then make the bitxor for the CRC register and the fixed data OxA001 Repeat c for 8 times Repeat step b c d for the next byte of frame data till the last byte The last number in the CRC register is the last pari
101. al Multi Registers Preset UCRONSET Double Optional Multi Registers Preset UCROFFSET Double Optional Multi Registers Preset CMD 33 mandatory Multi Registers Table 18 CC mode switch to CV mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCCV Double Optional Multi Registers Preset CMD 34 mandatory Multi Registers Table 19 CR mode switch to CR mode Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRCV Double Optional Multi Registers Preset CMD 35 Must select Multi Registers Table 20 battery test mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UBATTEND Double Optional Multi Registers Preset CMD 38 mandatory 42 Multi Registers Intepro Systems 2012 Table 21 Dynamic Test Mode Operation Register Value Description Preset IA Double Optional Multi Registers Preset IB Double Optional Multi Registers Preset TMAWD Double Optional Multi Registers Preset TMBWD Double Optional Multi Registers Preset TMTRANRIS Double Optional Multi Registers Preset TMTRANFAL Double Optional Multi Registers Preset MODETRAN 0 2 Optional Multi Registers Preset CMD 25 mandatory Multi Registers Table 22 System parameter setting mode Operation Register Value Description Preset IMAX Double Optional Multi Registers Pre
102. alue followed by pressing the key Enter to confirm When the VFD display shows MAXIMUM xxxx xxxxxx indicating the upper limit of valid comparison press numeric keys to input the value followed by pressing the key Enter to confirm If all the steps set have been edited the VFD display will show EDIT AUTO TEST meaning exit back to the automatic testing function If all the steps set have not been edited the VFD display will show STEP n xxxxx MODE indicating that data of the N step is being edited 4 2 8 2 Setting up Automatic Test Trigger Output Mode Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and keys to get the item SETUP AUTO TEST followed by pressing the Enter key to confirm The load will enter into the automatic test trigger output mode There are the following 4 types of trigger output modes Please press the A and YW keys to select one you wanted followed by pressing the key Enter to confirm Prompting Messenges Explanation TRIGGER WHEN PASS Trigger once when pass the test TRIGGER WHEN FAIL Trigger once when failing the test TRIGGER WHEN TEST END Trigger once when finishing the test TRIGGER DISABLE Trigger disabled Meanwhile the Load will display the following trigger output electrical feature Display Description OUTPUT LEVEL Wh
103. ance DELAY TIME Test delay time 0 2 25 5S INPUT xxxx Input the parameters set for example CC mode 1A MINIMUM xxxx Input the minimum lower limit MAXIMUM xxxx Input the maximum upper limit SETUP AUTO TEST TRIGGER Trigger output selection WHEN PASS Trigger once when passing the test WHEN FAIL Trigger once when failing the test WHEN TEST END Trigger output is initiated when test ends DISABLE Disable trigger output OUTPUT Output electrical characteristics selection PULSE Pulse output LEVEL Voltage level output EXIT EXIT Intepro Systems 2012 Chapter 4 Panel Operation 4 1 Basic Operation Mode Four operation modes are avaliable for EL97 series electronic loads 1 Constant current CC 2 Constant voltage CV 3 Constant resistance CR 4 Constant power CW 5 Constant Current Shifting into Constant Voltage Mode CC CV 6 Constant Resistance Shifting into Constant Voltage Mode CR CV 4 1 1 Constant Current Operation Mode CC In this mode the electronic load will sink a current in accordance with the programmed value regardless of the input voltage Please refer to the picture 4 1 If maximum current value of the measured power supply is lessen than the constant current value set the electronic load might fail to adjust itself to the constant current and the voltage of the measured power supply could be changed to be low I Current Set Load current gt Load voltage y 4 1 Constant Curren
104. andatory Table 4 Local allows the operator to Operation Register Value Description 38 Intepro Systems 2012 Force Single Coil PC2 0 mandatory Table 5 Input ON operation Operation Register Value Description Preset CMD 42 mandatory Multi Registers Table 6 Input OFF operation Operation Register Value Description Preset CMD 43 mandatory Multi Registers Table 7 Short circuit operation Operation Register Value Description Preset CMD 26 mandatory Multi Registers Table 8 CC mode operation Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset CMD 1 mandatory Multi Registers Table 9 CV mode operation Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset CMD 2 mandatory Multi Registers Table 10 CW mode operation Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset CMD 3 mandatory Multi Registers Table 11 CR mode operation Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset CMD 4 mandatory Multi Registers 39 Table 12 CC mode soft start Intepro Systems 2012
105. anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant resistance value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 2 2 Loading and Unloading Constant Resistance Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant resistance mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant resistance mode When the VFD display shows ONSET VOL T XXxXxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD
106. ation is turned on 5A 2 0ms 3 0ms Picture 4 10 Continuous Operation Mode 4 2 2 Pulse Mode PULSE In this mode when the dynamic testing operation is turned on the electronic load will switch to value B as receiving one trigger signal taking the pulse time TWD of value B Load will return to Value A TWD TWD 10ms lt 10ms TRIG TRIG 5A Picture 4 11 Pulse Operation Mode 4 2 3 Trigger Mode TRIGGER In this mode when the dynamic testing operation is turned on the electronic load will switch the state between value A and value B once receiving a triggering signal 21 Intepro Systems 2012 DATT TRG TRG Picture 4 12 Trigger Operation Mode 4 2 4 Setting up Dynamic testing operation Parameters Press the key Shift 6 S_Tran then the load VFD display shows LEVEL A CURR xxxxxxxxA indicating the current value A set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH A TM xxxxxxxxmsS indicating the current lasting time of current value A set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows RISING TM xxxxxxxxmsS indicating the current rising time set from value A to value B Press the numeric keys and decimal point key to enter the rising time required followed
107. ble type TMTRANFAL 0x0A2B 2 W R Dynamic model falling time register double type MODETRAN 0x0A2D 1 W R Dynamic mode register u16 type UBATTEND 0x0A2E 2 W R Battery Test termination voltage register double type BATT 0x0A30 2 W R Battery capacity register double type SERLIST 0x0A32 1 W R LIST serial number register u16 type SERATEST 0x0A33 1 W R Automatic Test serial number register u16 type IMAX 0x0A34 2 W R Current maximum register double type UMAX 0x0A36 2 W R Voltage maximum register double type PMAX 0x0A38 2 W R Power maximum register double type ILCAL Ox0A3A 2 W R Calibration current low end target value double type IHCAL 0x0A3C 2 W R Current high end calibration target value double type ULCAL Ox0A3E 2 W R Voltage low end calibration target value double type UHCAL 0x0A40 2 W R Voltage high end calibration target value double type TAGSCAL 0x0A42 1 W R Calibration state tag u16 type U 0x0B00 2 R Voltage Register double type Intepro Systems 2012 0x0B02 Current Register double type SETMODE 0x0B04 Operation Mode register u16e type INPUTMODE 0x0B05 Input Status Register u16 type MODEL 0x0B06 Model Register u16 type lt a sch 1 PO DD D DdD D EDITION 0x0B07 software version number register u16 type 4 8 8 The Definition Of The Command Register CMD Definition CMD Value Description CC 1 CV 2 CW 3 CR 4
108. can not only transform TTL voltage level into RS232 signal but also connect the DB9 interface connector with computer s serial interface 4 9 1 M 131 or M 133 Communication Cable The DB9 interface connector on the rear panel of electronic load is TTL voltage level you can use the communication cable M 131 or M 133 to connect the DB9 interface connector of the electronic load and the RS 232 interface connector of computer for the communication Please refer to the following picture for M 131 or M 133 43 Intepro Systems 2012 Picture4 9 2 M 133 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 to connect them 4 9 2 Communication between Power Supply and PC The DB9 interface connector on the rear panel of the electronic load can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 The following instructions can help you understand how to control the output of power supply by PC 1 RS232 Setting Before using the remote operation mode please make sure that the baudrate and communication address in power supply are the same as that in the computer software otherwise the communication will fail You can change the baud rate and communication address from the front panel or from computer 1 Baud rate 9600 4800 9600 19200 38400 which are selectable fro
109. cccccccccccccecceeceeeeseeeceeeeeeeeseeeeceeeceeeeeeeeeeseeeeseesseeeseesseeeeeeenees 29 4T Battery KE 30 4 8 Communication Protocol EE 31 48 T Introduction EE 31 SE e RE 32 Dh H DIU EE 32 4 8 4 FUNCHONG OGG ENG 32 4 9 5 Error ee ln Dt 33 4 8 6 Complete Command Frame Analysis cccccccescessesseeseceseeeeseeeaceeeeceeaeeseeeeeeeeeseeaees 33 4 8 7 Coil With The Register Address Allocation ccccccccssscssccesccessecssccesseeseceseeceseeeseeens 36 4 8 8 The Definition Of The Command Register CMD 38 4 8 9 Common Operation Function Description 0 ce eee ceeeeeeeeteeseceeeceeesaeeseeeeeeeeeaeeaees 38 AO FRC MIGIS OPGEAM ee E E 42 4 9 1 M 131 or M 133 Communication Cable cece cccessceeeeseenseeeeeeseeseeeseeeeeneceseeaes 43 4 9 2 Communication between Power Supply and PC 43 QUICK REPETENCE erger eege ee Mean NEN Eege EE 46 Intepro Systems 2012 Chapter 1 Overview EL97series DC electronic load as a new generation product of Maynuo Electronical Co Ltd is designed with high performance chips high speed high accuracy and with resolution of 0 1 Mv and 0 01 mA the basic accuracy is 0 03 the basic current rise speed is 2 5 A us EL97 series has a wide application in production line cell phone charger cell phone battery electric vehicle battery Switching power supply linear power supply research institutes automotive electronics aeronautics and astronautics ships solar cells fuel cell etc EL97 series
110. coder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 4 2 Loading and Unloading Constant Power Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant power mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant power mode When the VFD display shows ONSET VOLT xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXXXxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW_UN or Unreg Showing CW_UN means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supply has been correctly connected and turned
111. ction in last step step 4 6 Since list function shares the same storage space with automatic testing function please make sure that the sequential code that you selected in the list function is the same with that in automatic testing function If the sequential code which was defined as automatic testing function before now is defined as list function the automatic testing function of this sequential code will be deleted and cannot be restored 24 Intepro Systems 2012 4 2 7 2 Executing List Function Press the key Shift 0 to enter into menu configuration and then press the A and VW keys to get the item MENU LIS followed by pressing the key Enter to confirm Then press the A and W keys to get the item LOAD LIST followed by pressing the Enter key to confirm Then press the A and W keys to select the sequential code defined as list function you want to execute followed by pressing the Enter key to confirm Since the list function shares the same storage space with automatic testing function those sequential code defined as the automatic testing function will be automatically shielded when choosing the sequential codes which are defined as list function 4 2 8 Automatic Testing Function The electronic load is available of automatic testing function 8 sets of data can be edited at most and 50 steps can be edited in each set of data Each step can be edited as the following six working mode load off mode constant current mode constant vol
112. d Coil Status 0x01 Read Coil Status Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Starting Address 2 0 OxFFFF NO of Points 2 1 16 CRC Error Check 2 Read Coil Status Example Normal Response Filed Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Byte Count 1 1 2 Data Coil Status n CRC Error Check 2 Read Coil Status Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x81 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example reads the load input state ISTATE of Coil at slave device address 0x01 From table 4 8 7 1 we know that the ISTATE address is 0x0510 Query 0x01 0x01 0x05 0x10 0x00 0x01 OxFC 0xC3 The Corresponding Nomal Response 0x01 0x01 0x01 0x48 0x51 OxBE among which 0x48 is the read back data and its lowest bit is 0 this means the input state ISTATE is OFF Intepro Systems 2012 2 Force Single Coil 0x05 Force Single Coil Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x05 Coil Address 2 0 OxFFFF Force Data Coil Status 2 0x0000 or xFFOO CRC Error Check 2 Force Single Coil Example Normal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Coil A
113. d Constant Power Mode Press the key P SET then the VFD display will show STANDARD POWER xxxxxxxxW indicating the current constant power Then Press the numeric keys and decimal point key to enter the constant power value required followed by pressing the key Enter In this way the load will enter into the standard constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW or Unreg Showing CW means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage of the power supply is normal and the maximum output current of the measured power supply is undercurrent If you want to fine tune the constant power value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant power value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the Intepro Systems 2012 fine tuning accuracy just press the rotary en
114. d couldn t control the voltage to the value set Load input Volt Set Voltage gt Load current I Picture4 7 Constant Voltage Mode 4 1 3 1 Setting up a Standard Constant Voltage Mode Press the key V SET then the VFD display will show STANDARD VOL T xxxxxxxxV indicating the current constant voltage value Then Press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter In this way the load will enter into the standard constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV or Unreg Showing CV means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage of the measured power supply is normal and if the output current is beyond the maximum current that the load can carry If you want to fine tune the constant voltage value you can rotate the selective encoder knob locating at the right upper corner of the front panel to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Not
115. d find the blowout fuse Then replace the bad fuse with a new one ined DNase ey Fuse postion UHT Waat uu HA e A 8 l Picture 3 1 Fuse Location 3 3 Front Panel Operation Please refer to the picture3 2 for the front panel of EL97 electronic load Picture 3 2 Front panel 16 character display shows voltage and current measurements 2 Rotary knob Turn to adjust a setting value Press in to toggle between setting the currently selected mode s value and reading the voltage and current as shown in the above picture Numeric keypad Numeric entry keys Secondary key functions 4 Keypad Intepro Systems 2012 Enable disable input Set up the current voltage power and resistance modes Scroll through menus and options Input terminals Depending on the model you will have different types and numbers of input Terminals Models EL9713 EL9713B EL9714 EL9714B EL9715 EL9715B EL9716 EL9716B come with two positive and two negative terminals however each terminal is able to sink the maximum current supported by the instrument Thus it is not necessary to double up on the wires when sinking a high current unless you wish to E ay ECH enne rr 2 a E me ue a O wen CT mmm D SEE SE ne et D ES ia 8 f SS SEs mem a ees Ss WS Wel BEE ae G wee m e ee be es E mr f os E ee _ e a s 3 o mue Ee r ED Sas ee ee Me
116. data Each step can be edited as the following six working mode load off mode constant current mode constant voltage mode constant power mode constant resistance mode 24 Intepro Systems 2012 short circuit mode and can be edited as the following four types current comparison voltage comparison power comparison and resistance comparison Besides the delay time of each step can also be edited The delay time of each step ranges from 0 1 25 5S considering the quickness and accuracy When automatic test is over the electronic load will indicate if it passes the test or failed If it fails the electronic load will sound alarm Meanwhile the electronic load can be triggered by front panel and TRIGGE IN hardware voltage level in the back panel and can output the trigger voltage level from the TRIGER OUT terminals on back panel You can setup it as the voltage level trigger mode or pulse trigger mode and can have 4 selections of Pass trigger failure trigger finish trigger and disabled trigger 4 2 8 1 Automatic Test Operation 1 Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and W keys to get the item EDIT AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD
117. ddress 2 0 0xFFFF Force Data Coil Status 2 0x0000 or OxFFOO CRC Error Check 2 Force Single Coil Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x85 Abnormal Code 1 01 04 CRC Error Check 2 A value of OxFFOO forces the coil to be ON and 0x0000 forces the coil to be turned OFF All other values are invalid and will not affect the coil For example The following example sets the load is in remote control at slave device address 0x01 From table 4 8 7 1 we know that the PC1 remote address is 0x0510 Query 0x01 0x05 0x05 0x00 OxFF 0x00 0x8C OxF6 The Correponding Response 0x01 0x05 0x05 0x00 OxFF 0x00 Ox8C OxF6 3 Read Holding Registers 0x03 Read Holding Registers Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Starting Address 2 0 OxFFFF No of Points 2 n 1 32 CRC Error Check 2 Read Holding Registers Example Nomal Response 34 Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Intepro Systems 2012 Byte Count 1 2 n Data EN CRC Error Check 2 Read Holding Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x83 Abnormal Code 1 01 04 CRC Error Check 2 For example Th
118. de When the VFD display shows ONSET VOL T xxxxxxxxvV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant current mode Intepro Systems 2012 If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_UN or Unreg Showing CC_UN means the load has successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the expected constant current value is in the range of the measured power supplier In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant current mode 4 1 1 3 Soft Start Constant Current Mode Soft start constant current mode functions as an inductive load simulat
119. de When the VFD display shows RISING TM xxxxxxxxvmS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_S or Unreg Showing CV_S means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the maximum output current of the measured power supplier is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 2 S_ Start the load will back into the standard constant voltage mode Note The rise time which is set is automatically regulated to be the round number times of 20uS 4 1 4 Constant Power Operation Mode CW In this mode the electronic loads will consume a constant power Please refer to the picture 4 9 If the load input voltage value increase the load input current will decrease Therefore the load power V I will remain in the power set
120. display shows STEP LENG XxX indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round numbers of 1 50 3 When the VFD display shows STEP 1 xxxxx MODE indicating the working mode selected in the step 1 press the A and YW keys to select one mode from him following six working modes followed by pressing the key Enter to confirm Working Prompting Explanation Mode Messenges Load Off LOAD OFF MODE Compare the voltages when in load off mode Mode CC Mode CC MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CV Mode CV MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CP Mode CP MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CR Mode CR MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison Short Circuit SHORT MODE Compare the current when in short circuit mode Mode 4 When the VFD display shows STEP 1 TEST xxxx indicating the test types There are four test types test current test voltage test power test resistance Press the A and YW keys to select one from those four types
121. duration of each step ranges from 2mS to 131070mS 4 2 7 1 List Operation 1 Press the key Shift 0 to enter into the menu operation and then press the A and W keys to get the item MENU LIST followed by pressing the Enter key to confirm Then press the A and VW keys to get the item EDIT LIST followed by pressing the Enter key to confirm Then press the A and YW keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows MINIMUM TM xxxxxx mS indicating the minimum time that requires to be set Since this value affects the fine tuning and operable length of all kinds of waveforms please carefully select the suitable parameters Then press the key Enter to confirm The electronic load will go into the following three output modes LIST CONTINOUS LIST END HOLD and LIST END RESET Press the A and V keys to select one output mode you wanted followed by pressing the key Enter to confirm LIST CONTINOUS means continuous output mode LIST END HOLD means the electronic load will remain the last value you set in the last step when all the steps you set in one set of data have been successfully executed LIST END RESET means the electronic load will reset to be load off mode when all the steps you set in one set of data have been successfully executed 3 After pressing the key Enter to confirm the VFD display will show STEP LENG xxx indicating the step length that requires to be
122. e If the constant voltage value you want to set is beyond the maximum constant voltage value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant voltage value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 3 2 Loading and Unloading Constant Voltage Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant voltage mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant voltage mode When the VFD display shows ONSET VOL T xxxxxxxxV 17 Intepro Systems 2012 indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant voltage mode If the inp
123. e then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR CV or Unreg Showing CR CV means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant resistance mode press the key Shift 5 CR CV the load will back into the standard constant resistance mode 4 1 3 Constant Voltage Operation Mode CV In this mode the electronic load will attempt to sink enough current to control the source voltage to the programmed value Please refer to the picture 4 7 Note When the voltage of the measured power supplier is lessen than the voltage value set or the maximum input current is beyond the maxim current that the load can absorb the load couldn t control the voltage to the value set Intepro Systems 2012 Load input Volt Set Voltage Load current Picture4 7 Constant Voltage Mode 4 1 3 1 Setting up a Standard Constant Voltage Mode Press the key V SET then the VFD display will show STANDARD VOL T xxxxxxxxV indicating the current constant voltage value Then Press the numeric keys and decimal point key to enter the constant
124. e Range Voltage and current input Resolution value 210 full Measument Accuracy Voltage V Measurement Resolution Accuracy Current I Measurement Resolution Accuracy W Measurement Watt Voltage and A current input Resolution value 210 full Measument Accuracy Battery Measruement Dynamic Measurement CC soft startup Time Current CC Short Circuit Voltage CV Resistance C R Operating Temperature Nonoperating Dimension W H D mm Weight Kg 24A mA 05 0 05 FS 1 19 999V mV 03 0 0290FS 03 2 10K 6bit 1 0 1 FS 1800W mW 1 0 1 FS 19 999V mV 015 0 03 FS 24A lm 03 0 05 0FS 00w mW 1 0 1 FS M9715 1800W 0 240A 0 150V 240A M9715B 1800W 0 120A 0 500V 12A 0 120A 10mV mV 10mV 03 0 02 FS 03 0 02 FS 0 03 0 05 FS 03 2 5K 03 2 10K 0 03 2 5K 0 24A ImV 0 03 0 02 FS 0 3 2 10K M9716 2400W 0 240A 0 150V 0 240A 10mV 0 3Q 5K 1 0 05 FS 05 0 05 FS 0 1 0 05 FS 0 05 0 05 FS 0 1 0 05 FS 0 05 0 05 FS 1 0 05 FS 1 150V 1 19 999V 0 1 500V 0 1 19 999V 0 1 150V 0 1 19 999V 1 500V ImV 10mV 0 03 0 02 0FS 0 03 0 02 FS 0 03 0 05 FS 0 03 2 10K 03 2 5K 16bit obit 16bit 16bit 16bit 16bit 16bit 0 1 0 1 FS 0 1800W 10mW 1 0 1 FS 10mW 0 1 0 1 FS 1 0 1 FS 0 1 0 1 FS 0 1800W 10mW 1 0 1 FS 0 1 0 1 FS 15 0 03 FS 0 015 0 05 FS 3 0 05 FS 0 1 0 05 FS 10mW 1 0 1 FS 0
125. e data by the word 0x10 Preset Multiple Registers write the data by the word 4 8 5 Error checking CRC EL97 series load use the Cyclic Redundancy Check CRC The CRC field checks the contents of the entire message The CRC fileld is two bytes containing a 16 bit binary value When the CRC ia appended to the message the low order byte is appended first followed by the high order byte The discipline is as follows a Setup one hex CRC register and give the initial value as OxFFFF b Make bitxor for the first byte of the frame date and the lower 8 bit of the CRC register And save the bitxor result into the CRC register 33 Intepro Systems 2012 c Right move CRC register for 1 byte and check the if the lowest bit is 1 if the lowest bit is 1 and then make the bitxor for the CRC register and the fixed data OxA001 d Repeat c for 8 times e Repeat step b c d for the next byte of frame data till the last byte f The last number in the CRC register is the last parity checking result Put it at the end of the frame data and keep the lower 8 bit in the after and higher 8 bit in former 4 8 6 Complete Command Frame Analysis 1 Read Coil Status 0x01 Read Coil Status Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Starting Address 2 0 OxFFFF NO of Points 2 1 16 CRC Error Check 2 Read Coil Status Example Normal Response
126. e either the input terminals at the front panel or at the back panel is initiated It is impossible to initiate the input terminals both at the front panel and at the back panel together If the voltage of the load is near to zero point and does not change according to the signal please check if the wire mode matches the parameters of the remote measurement function Please refer to the picture 4 4 for the trigger terminals and measurement terminals R S S TRQTRI GND 5 S TRQ TRI GND Piccture4 4 Remote Measurement Terminals S and S are remote measurement terminals TRQ and TRI are trigger terminals the last two terminals are ground terminals 30 Intepro Systems 2012 The output of power supply will be turned off when testing out the change in voltage level from high to low from TRQ port which is under the latched mode of the remote control function As a multifunction extended port TRI port is designed for future expanded The following diagram shows the remote sense terminals on the back panel of the instrument The following shows wiring diagram for the remote sensing Wiring diagram for remote sense 4 7 Battery Testing Experiment proves the test with load is the best method to ensure the battery whether work well or not Only with the correct load testing the battery can be confirmed if it was being the expectant life curve location The EL9711 electronic loads can be used to test any type of the battery now
127. e following example reads the present voltage value at slave device address 0x01 From table 4 8 7 1 we know that the register address of the present voltage value is OxOBOO Query 0x01 0x03 0x0B 0x00 0x00 0x02 OxC6 Ox2F The Corresponding Nomal Response 0x01 0x03 0x04 0x41 0x20 0x00 0x2A Ox6E 0x1A among which 0x41 0x20 0x00 Ox2A is the read back voltage value the corresponding floating point number is 10V 4 Preset Multiple Registers 0x10 Preset Multiple Registes Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 n 1 32 Byte count 1 2 n Preset Data 2 n CRC Error Check 2 Preset Multiple Registers Example Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 N CRC Error Check 2 Preset Multiple Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x90 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example sets the load s constant current IFIX is 2 3A at slave device address 0x01 35 Intepro Systems 2012 From table 4 8 7 1 we know that the IFIX register address is Ox0A01 the floating point takes up two word length Query 0x01 0x10 Ox0A 0x01 0x00 0x02 0x04 0x4
128. e measurement terminals are installed at the rear panel of the power supply Users can measure the out put terminals voltage of the instrument under test by the seterminals Before performing the remote sense function you need to set the power supply as the remote measurement mode see thesection 3 6 Menu Function in this manual The remote measurement function can be set by pressing the key Shift O Menu When the VFD display shows MENU SYSTEM SET press the key Enterto confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM TERMINAL SEL indicating to set the parameters of the current remote measurement function then press the key Enterto confirm When the VFD display shows TERMINAL SELECT FRONT or TERMINAL SELECT BACK press the Up and Downkeys to select the parameters of remote measurement function Showing TERMINAL SELECT FRONT means input terminals selected is at the front panel and the remote measurement function of the rear panel is closed showing TERMINAL SELECT BACK means input terminals selected is at the rear panel and the remote measurement function of the front panel is closed Then press the key Esc to escape the Menuitem Note At any time either the input terminals at the front panel or at the back check if the wire mode matches the parameters of the remote measurement function Please refer to the picture 4 4 for the trigger terminals and measurement ter
129. e numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm 22 Intepro Systems 2012 Then the load VFD display shows WIDTH B TM xxxxxxxxmsS indicating the current lasting time of current value B set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows FALLING TM xxxxxxxxmsS indicating the current falling time set from value B to value A Press the numeric keys and decimal point key to enter the falling time required followed by pressing the key Enter to confirm Then the load VFD display shows TRANMODE CONTINUOUS TRANMODE PULSE TRNMODE TRIGGER indicating the current dynamic testing operation mode Press the key Aor V to choose the dynamic testing operation mode you want followed by pressing the key Enter to confirm 4 2 5 Waveform Control 4 2 5 1 Square Wave When the rise time and falling time are both set as zero and the dynamic testing operation mode is set as continuous mode the output wave is square wave The output frequency is the inverse of the lasting time sum of current A and current B Since the minimum accuracy of all the time is set as 20uS the load can read the square wave with the maximum frequency of 25K Hz and duty cycle of 50 4 2 5 2 Triangular Wave When the lasting time of both current A and current B are set as zero and the dynamic testing op
130. e system it is necessary to use the load testing Because the battery is the lowest reliable component it must be tested by the load periodically to ensure the reliability of the battery Capability Test Constant current mode is applied in EL9711 Serial electronic load to test the capability A program is set to control voltage level When the voltage of the battery is too low the electronic load will identify the battery being on the threshold value set or at the margin of insecure state and will stop testing automatically When the load is in testing procedure you can see the battery voltage battery discharge 29 Intepro Systems 2012 current electronic load power and battery capability that has been spared If the load is connected with PC software then you can see the discharge curve of battery discharge This test can test out the reliability and remaining life of battery So it is very necessary to do the test before you change another new battery Operation 1 In standard constant current mode adjust the load current value to the discharge current value of battery required 2 Press the key Shift 8 Battery When VFD display shows END TEST VOLT xxxxxxxxV set the turn off voltage and press the key Enter to start the capability test When the voltage drops to the turn off voltage the load will automatically turn off 3 Press the key On Off to start or to pause the battery capability test 4 Press the key Shift 8 Battery t
131. echd ege EE 20 4 2 1 Continuous Mode CONTINUOUS EE 20 4 22 Pulse Mode PULSE WEE 21 4 2 3 Trigger Mode TRIGGER EG 21 4 2 4 Setting up Dynamic testing operation Parameters sssssssssssessesesseseesesresesseseseseese 21 4 2 5 Waveform COntrOl EE 22 4 2 5 1 Sq are ETH 22 4 2 5 2 Triangular EE 22 4 2 5 3 Trapez idal Wave E 22 4 2 6 Trigger lut e EE 22 Ae FEAST eene EE 23 A En ER EE Ee EE 23 Intepro Systems 2012 4 2 1 2 EXecuting List FUNGON e noe e EE a ras 24 4 2 8 Automatic Testing Function 5 cccsssssseesasssexsoscvssasdasenescantednanvavednsded nasnsaseasonvnesteceeaseasevenneesns 24 4 2 8 1 Automatic Test Operation 24 4 2 8 2 Setting up Automatic Test Trigger Output Mode ssssesseseesesesseseesesresesseseseseese 25 4 2 8 3 Executing Automatic Test Function 0 0 0 0 ec ccececeseecseeceeeeeeeeseeceeeeaeeesaeeeeeeeaaeeseees 26 AS Input Comer EE 26 4 3 1 Short Circuit Operation EE A BEE EE 26 4 3 2 Inp t On OM BEE EE 26 4 4 Electronic Load Operation Range 27 AS Protection Functions eein cca ves EENS AEN 27 4 5 1 Over Voltage Protection OW isssssbsaroneearssssnvabnedetusiecgslanntanehenbetaceaatmnonetiubdatebastotunerenness 27 4 5 2 OVer C rrent Protection E LTE 28 4 5 3 Over Power Protection OW esssssssssssssessesessesseseseesessesesseseestssessssesresresesresresessesteseseese 28 4 5 4 Input Polarity Reversed EE 29 4 5 5 OverHeat Protection EE eege Eege 29 4 6 Remote Measurement Function cc
132. ed as the High Byte in the former and Low byte in the after Addition the output value of force single coil must be 0x0000 or OxFFOO 0x0000 means OFF while OxFFOO means ON All other values are invalid and will not affect the coil 4 8 4 Function Code Function codes are single byte hex number there are 4 function modes as follows Function Code Description 0x01 Read Coil Status read the data by the bit 0x05 Force Single Coil write the data by the bit 0x03 Read Holding Registers read the data by the word 0x10 Preset Multiple Registers write the data by the word 4 8 5 Error checking CRC EL97 series load use the Cyclic Redundancy Check CRC The CRC field checks the contents of the entire message The CRC fileld is two bytes containing a 16 bit binary value When the CRC ia appended to the message the low order byte is appended first followed by the high order byte The discipline is as follows a Setup one hex CRC register and give the initial value as OxFFFF b Make bitxor for the first byte of the frame date and the lower 8 bit of the CRC register And save the bitxor result into the CRC register c Right move CRC register for 1 byte and check the if the lowest bit is 1 if the lowest bit is 1 and then make the bitxor for the CRC register and the fixed data OxA001 d Repeat c for 8 times e Repeat step b c d for the next byte of frame data till the last byte f The last number in the CRC registe
133. eeeeeeee 17 4 1 3 Constant Voltage Operation Mode CN 17 4 1 3 1 Setting up a Standard Constant Voltage Mode cececesseseeseseeseeeeneeeeseeeeeeeees 18 4 1 3 2 Loading and Unloading Constant Voltage Mode uu ceccccceseeseeseeeeseeseeseeseeseenee 18 4 1 3 3 Soft Start Constant Voltage Mode 19 4 1 4 Constant Power Operation Mode CAN 20 4 1 4 1 Setting up a Standard Constant Power Mode eeceseecesseseeeereeeeseneeseeseeeeeeeees 20 4 1 4 2 Loading and Unloading Constant Power Mode e sssssssssssssssesesesesesesesesesesesesesesssss 21 4 2 Dynamic Testing Operation EE 21 4 2 1 Continuous Mode CONTINUOUS 21 4 2 2 Pulse MOUS PULSE Jeni iE E T EREE RE E E E E 22 4 2 3 rigger Mode TRIGGER EE 22 4 2 4 Setting up Dynamic testing operation Parameters cecccceceeceseeceeeeseeseeecseeseeeeaeesees 22 4 25 Waveform Control EE 23 e Ee 23 RE E tie e E 23 AD 523 NERT 23 BZ de Le E ut EE 23 4 2 7 List FCC OM E 24 pe ea Ee e EE 24 Intepro Systems 2012 4 2 7 2 EXECUTING E FUNCOM EE 25 4 2 8 Automatic Testing Function seks cnn eels Lute il tae bial Sa Re ee 25 4 2 8 1 Automatic Test oerabon d esederiedeereeeeeeEEENeEeEeEee dessa ave eens 25 4 2 8 2 Setting up Automatic Test Trigger Output Mode 2 0 cee ceeeceseeteeteeteeteeneeeeenee 26 4 2 8 3 Executing Automatic Test Function 0 0 0 0 cc ccesecssesecseesscseeescsseesceseessssecseseeseseeenes 27 4 3 IMDS ON MU OO nin a tee tna ere e aca EE a a E a a a tae 27 4 3 1 Short Circui
134. en there is a trigger output the voltage level will change from low to high till a key pressed or a trigger input signal arrive the voltage level will sink to low status OUTPUT PLUSE When there is trigger output the voltage level change from low to high status 5 seconds later it will sink to low automatically 4 2 8 3 Executing Automatic Test Function Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and keys to get the item LOAD AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y 26 Intepro Systems 2012 keys to select the sequential code defined as the automatic test function you want to execute followed by pressing the Enter key to confirm Then the upper right corner of the VFD display shows AUT n meaning the n automatic test list will be initiated The bottom right of the VFD If users have prepared all things well press the key On Off to initiate the automatic test The automatic test can also be initiated by lowering the voltage level of TRIG IN port and lasting more than 5mS When in testing the right lower corner of the VFD display will show WAIT or STAY meaning waiting for testing or staying in the suspended mode respectively Please retrigger it so that it goes on testing After testing the right lower corner of the VFD display wi
135. er Power tag HEAT 0x0523 1 R 1 over heat tag REVERSE 0x0524 1 R 1 reverse tag UNREG 0x0525 1 R 1 register parameter failed tag ERREP 0x0526 1 R 1 EPPROM error tag ERRCAL Ox0527 1 R 1 calibration data error tag Table 2 Register XRAM area definition Name Address Bit Property Description mp Gees lk WR Command Register lower 8 bits effective high 8 bits meaningless IFIX Ox0A01 2 W R Constant current register double type UFIX Ox0A03 2 W R Constant voltage register double type PFIX Ox0A05 2 W R Constant power register double type RFIX Ox0A07 2 W R Constant resistance register double type TMCCS Ox0A09 2 W R Current soft start rising time register double type TMCVS OxOAOB 2 W R Voltage soft start rising time register double type UCCONSET OxOAOD 2 W R Constant current load voltage register double type UCCOFFSET OxOAOF 2 W R constant current unload voltage register double type UCVONSET Ox0A11 2 W R Constant voltage load voltage register double type UCVOFFSET Ox0A13 2 W R Constant voltage unloaded voltage regi double type UCPONSET Ox0A15 2 W R Constant power load voltage register double type UCPOFFSET Ox0A17 2 W R Constant power unload voltage register doubl type UCRONSET Ox0A19 2 W R Constant resistance load voltage register double type 36 Intepro Systems 2012
136. er is lessen than the voltage value set or the maximum input current is beyond the maxim current that the load can absorb the load couldn t control the voltage to the value set Load input Volt Set Voltage gt Load current I Picture4 7 Constant Voltage Mode 4 1 3 1 Setting up a Standard Constant Voltage Mode Press the key V SET then the VFD display will show STANDARD VOL T xxxxxxxxV indicating the current constant voltage value Then Press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter In this way the load will enter into the standard constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV or Unreg Showing CV means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage of the measured power supplier is normal and if the output current is beyond the maximum current that the load can carry If you want to fine tune the constant voltage value you can rotate the selective encoder knob locating at the right upper corner of t
137. er directly by a standard RS232 cable Please use IT E131 or M133 to connect them 45 Intepro Systems 2012 Quick Reference Safety Please donot install any spare or repair the instrument without permission In order to make sure the normal work of the instrument please have it mended in the maintenance department designated by our company Pease review the following safety precautions before operating our equipment Safety Symbols Please keep in mind the following items which may result in injuries on your body Connect it to safety earth ground using the wire recommended in the user manual A N High voltage danger Non professionals are forbidden to open the instrument N The symbol on an instrument indicates that the user should refer to the operating Instructions located in the manual please wear gloves when you start to opreate and be ware of electronic shock Don t use the equipment at the about personal safety place Certification and Warranty EL97 Series Electrical Loads meet its published specifications at time of shipment from the factory Warranty This instrument product is warranted against defects in material and workmanship for a period of one year from date of delivery Maintenance Service This product must be returned to maintenance department designated by our company for repairing Customer shall prepay shipping charges and shall pay all duty and taxes for products returned to the supplier for warranty s
138. eration mode is continuous mode the output wave is triangular wave The output frequency is the inverse of the sum of the rising time and falling time Since the minimum accuracy of all the time is set as 20uS the load can read the triangular wave with the maximum frequency of 25K Hz Since the rising edge and falling edge of the triangular wave are all step wave with 20uS output frequency the ideal degree of triangular wave is in inverse proportion to the its output frequency In extreme situations the triangular wave might function as square wave there is 0 100 accuracy difference according to the different rising time and falling time set 4 2 5 3 Trapezoidal Wave When the four time parameters that need to set are all bigger than zero and the dynamic testing operation mode is continuous mode the load output wave is trapezoidal wave It has the same frequency characteristics with the triangular wave 4 2 6 Trigger Control When dynamic testing operation mode is set as pulse mode or trigger mode the trigger control is initiated There are three trigger modes ay Keypad triggering mode Press the key Shift Trigger to p trigger the electronic load b TTL triggering mode 23 Intepro Systems 2012 Send a high pulse with a constant time more than 5m Sec to the trigger In terminals in rear panel to trigger the electronic load Cy PC control software triggering mode 4 2 7 List Function The electronic load is available of list operatio
139. ervice Except for products returned to customer from another country supplier shall pay for return of products to customer Limitation of Warranty The foregoing warranty shall not apply to 1 Defects resulting from improper or inadequate maintenance by the Customer 2 Customer supplied software or interfacing 3 Unauthorized modification or misuse 4 Operation outside of the environmental specifications for the product or improper site preparation and maintenance 5 Defects resulting from the circuit installed by clients themselves Attention 46 Intepro Systems 2012 No inform will be given for any changes in the content of the user s guide thiscompany reserves the right to interpret 47
140. escription Preset IFIX Double Optional Multi Registers Preset UCCONSET Double Optional Multi Registers Preset UCCOFFSET Double Optional Multi Registers Preset CMD 30 mandatory Multi Registers Table 15 CV loading and unloading mode Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset UCVONSET Double Optional Multi Registers Preset UCVOFFSET Double Optional Multi Registers Preset CMD 31 mandatory 40 Multi Registers Intepro Systems 2012 Table 16 CW loading and unloading mode Multi Registers Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset UCPONSET Double Optional Multi Registers Preset UCPOFFSET Double Optional Multi Registers Preset CMD 32 mandatory Multi Registers Table 17 CR loading and unloading mode Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset UCRONSET Double Optional Multi Registers Preset UCROFFSET Double Optional Multi Registers Preset CMD 33 mandatory Multi Registers Table 18 CC mode switch to CV mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UCCCV Double Optional Multi Registers Preset CMD 34 mandatory Multi Registers Table 19 CR mode switch to CR mode Operation Register Value Descri
141. et among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 4 2 Loading and Unloading Constant Power Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant power mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant power mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW_UN or Unreg Showing CW_UN means the load has been successfully set into the expected constant power value sh
142. et into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the maximum output current of the measured power supplier is in the range of the maximum current that the load can absorb 18 Intepro Systems 2012 In loading and unloading constant voltage mode press the key Shift 2 S_Sitart the load will back into the standard constant voltage mode Note The rise time which is set is automatically regulated to be the round number times of 20uS 4 1 4 Constant Power Operation Mode CW In this mode the electronic loads will consume a constant power Please refer to the picture 4 9 If the load input voltage value increase the load input current will decrease Therefore the load power V Iwill remain in the power set Load input voltage V2 eee Power set T2 iB L Load current Picture 4 9 Constant Power Mode 4 1 4 1 Setting up a Standard Constant Power Mode Press the key P SET then the VFD display will show STANDARD POWER xxxxxxxxW indicating the current constant power Then Press the numeric keys and decimal point key to enter the constant power value required followed by pressing the key Enter In this way the load will enter into the standard constant power mode If the input state is in OFF state then the right upper corner of the VFD disp
143. evel will sink to low status 26 Intepro Systems 2012 OUTPUT PLUSE When there is trigger output the voltage level change from low to high status 5 seconds later it will sink to low automatically 4 2 8 3 Executing Automatic Test Function Press the key Shift 0 to enter into the menu configuration and then press the A and YW keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and W keys to get the item LOAD AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code defined as the automatic test function you want to execute followed by pressing the Enter key to confirm Then the upper right corner of the VFD display shows AUT n meaning the n automatic test list will be initiated If users have prepared all things well press the key On Off to initiate the automatic test The automatic test can also be initiated by lowering the voltage level of TRIG IN port and lasting more than 5mS When in testing the right lower corner of the VFD display will show WAIT or STAY meaning waiting for testing or staying in the suspended mode respectively Please retrigger it so that it goes on testing After testing the right lower corner of the VFD display will show either PASS or FAIL When it failures the buzzer will sounds At this moment initiate next trigger or press any key to free from the indication of pass or fail
144. evel will sink to low status OUTPUT PLUSE When there is trigger output the voltage level change from low to high status 5 seconds later it will sink to low automatically 4 2 8 3 Executing Automatic Test Function Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and W keys to get the item LOAD AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code defined as the automatic test function you want to execute followed by pressing the Enter key to confirm Then the upper right corner of the VFD display shows AUT n meaning the n automatic test list will be initiated The bottom right of the VFD If users have prepared all things well press the key On Off to initiate the automatic test The automatic test can also be initiated by lowering the voltage level of TRIG IN port and lasting more than 5mS When in testing the right lower corner of the VFD display will show WAIT or STAY meaning waiting for testing or staying in the suspended mode respectively Please retrigger it so that it goes on testing After testing the right lower corner of the VFD display will show either PASS or FAIL When failure the buzzer will sound At this moment initiate next trigger or press any key to free from the indication of pass or fail When once automat
145. ey Shift 0 to enter into menu configuration and then press the A and W keys to get the item MENU LIS followed by pressing the key Enter to confirm Then press the A and YW keys to 23 Intepro Systems 2012 get the item LOAD LIST followed by pressing the Enter key to confirm Then press the A and vg keys to select the sequential code defined as list function you want to execute followed by pressing the Enter key to confirm Since the list function shares the same storage space with automatic testing function those sequential code defined as the automatic testing function will be automatically shielded when choosing the sequential codes which are defined as list function 4 2 8 Automatic Testing Function The electronic load is available of automatic testing function 8 sets of data can be edited at most and 50 steps can be edited in each set of data Each step can be edited as the following six working mode load off mode constant current mode constant voltage mode constant power mode constant resistance mode short circuit mode and can be edited as the following four types current comparison voltage comparison power comparison and resistance comparison Besides the delay time of each step can also be edited The delay time of each step ranges from 0 1 25 5S considering the quickness and accuracy When automatic test is over the electronic load will indicate if it passes the test or failed If it fails the electronic load will sound ala
146. ey Shift 4 CC CV the load will back into the standard constant current mode 4 1 2 Constant Resistant Operation Mode CR In this mode the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance Please refer to the picture 4 5 Note when the voltage of the measured power supply is too high and the resistance set is too low it will result in the consumed current higher than the maxim output current of the measured power supply or result in the loads failing to adjust itself automatically to the constant resistance even result in the load shock Load current Slop resistance set gt Load input voltage v 15 Intepro Systems 2012 Picture 4 5 Constant Resistance Mode 4 1 2 1 Setting up a Standard Constant Resistance Mode Press the key R SET then the VFD display will show STANDARD RESI xxxxxxxxQ indicating the current constant resistance Then Press the numeric keys and decimal point key to enter the constant resistance value required followed by pressing the key Enter In this way the load will enter into the standard constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR or Unreg Showing CR means the load has been successfully set into the expected cons
147. ftware electronic load VXXX serial No EEPROM damage or lost data of last power EPROM ERROR 2 Wait for 1s after off turn on electronic load ERROR CAL DATA EEPROM lost calibration data 3 Wait for another 2S once ERROR XXXXXXXV XXXXXXXA Display the actual input voltage and current XXXXXXXW XXXXXXXX value actual power value and setting value occurred 3 2 In Case Of Trouble If electronic load fails to run during power on operation the following test will help you to solve the problems that might be encountered 1 Make sure if you have connected the power properly and On Off switch has been pressed 2 Check the power voltage setting There are two voltages which can make load work 110V or 220V Please make sure you get the right voltage in accordance to the voltage in your area 3 Check the fuse of load If fuse is blowout please change another fuse with the following specification Model Fuse specification Fuse specification Intepro Systems 2012 110VAC 220VAC EL9715 T2 5A 250V T1 25A 250V EL9715B T2 5A 250V T1 25A 250V EL9716 T2 5A 250V T1 25A 250V EL9716B T2 5A 250V T1 25A 250V EL9716E T2 5A 250V T1 25A 250V 4 Replace the Fuse Open the plastic cover in the rear panel of the electronic load with a flat screwdriver see the table 3 1 and find the blowout fuse Then replace the bad fuse with a new one
148. gular wave The output frequency is the inverse of the sum of the rising time and falling time Since the minimum accuracy of all the time is set as 20uS the load can read the triangular wave with the maximum frequency of 25KHz Since the rising edge and falling edge of the triangular wave are all step wave with 20uS output frequency the ideal degree of triangular wave is in inverse proportion to the its output frequency In extreme situations the triangular wave might function as square wave there are 0 100 accuracy difference according to the different rising time and falling time set 4 2 5 3 Trapezoidal Wave When the four time parameters that need to set are all bigger than zero and the dynamic testing operation mode is continuous mode the load output wave is trapezoidal wave It has the same frequency characteristics with the triangular wave 4 2 6 Trigger Control When dynamic testing operation mode is set as pulse mode or trigger mode the trigger control is initiated There are three trigger modes 22 Intepro Systems 2012 ER Keypad triggering mode Press the key Shift Trigger to p trigger the electronic load b TTL triggering mode Send a high pulse with a constant time more than 5m Sec to the trigger In terminals in rear panel to trigger the electronic load Cy PC control software triggering mode 4 2 7 List Function The electronic load is available of list operation function 8 sets of data can be edited at most and 200
149. hares the same storage space with automatic testing function please make sure that the sequential code that you selected in the list function is the same with that in automatic testing 23 Intepro Systems 2012 function If the sequential code which was defined as automatic testing function before now is defined as list function the automatic testing function of this sequential code will be deleted and cannot be restored 4 2 7 2 Executing List Function Press the key Shift 0 to enter into menu configuration and then press the A and W keys to get the item MENU LIS followed by pressing the key Enter to confirm Then press the A and YW keys to get the item LOAD LIST followed by pressing the Enter key to confirm Then press the A and YW keys to select the sequential code defined as list function you want to execute followed by pressing the Enter key to confirm Since the list function shares the same storage space with automatic testing function those sequential code defined as the automatic testing function will be automatically shielded when choosing the sequential codes which are defined as list function 4 2 8 Automatic Testing Function The electronic load is available of automatic testing function 8 sets of data can be edited at most and 50 steps can be edited in each set of data Each step can be edited as the following six working mode load off mode constant current mode constant voltage mode constant power mode constant resistance
150. he current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_UN or Unreg Showing CC_UN means the load has successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected 12 Intepro Systems 2012 constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the expected constant current value is in the range of the measured power supply In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant current mode 4 1 1 3 Soft Start Constant Current Mode Soft start constant current mode functions as an inductive load simulating inductance value which is in direct proportion with the rise
151. he A and g keys or by rotating the knob and then press the key Enter to enter in the menu item you wanted Or you can press the key Esc to return to the last menu MENU CONFIG INPUT RECALL Setting the output to the same state at last time when the load is turned off or to the OFF state when the electronic load is powered on ON Setting the same state as last time you turned off the eletronic load OFF Setting the output to OFF state when the electronic load is powered on The load will work at CC mode KEY SOUND SET Setting the key sound ON The buzzer will sound when any key was pressed OFF the buzzer will not sound when any key was pressed Intepro Systems 2012 CONNECT MODE Connect mode MAXTIDLEXING Multi SEPARATE Single BAUDRATE SET Setting the Baudrate 2400 9600 14400 28800 57600 115200 COMM PARITY Setting Comm Parity mode NONE None Parity EVEN Even Parity ODD Odd Parity ADDRESS SET Setting Address 1 200 The address is the input number 1 200 KEY LOCK SET Setting the keyboard unlocking password when it is 0 or null there is no password set EXIT SYSTEM SET MAX CURRENT SET Setting the maximum current If the maximum current is higher than 3A it is high range Otherwise it is low range MAX VOLTAGE SET Setting the maxim
152. he front panel to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Note if the constant voltage value you want to set is 17 Intepro Systems 2012 beyond the maximum constant voltage value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant voltage value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 3 2 Loading and Unloading Constant Voltage Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant voltage mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant voltage mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXXxXxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required follo
153. he loads failing to adjust itself automatically to the constant resistance even result in the load shock Load current Slop resistance set gt Load input voltage v Intepro Systems 2012 Picture 4 5 Constant Resistance Mode 4 1 2 1 Setting up a Standard Constant Resistance Mode Press the key R SET then the VFD display will show STANDARD RESI xxxxxxxxQ indicating the current constant resistance Then Press the numeric keys and decimal point key to enter the constant resistance value required followed by pressing the key Enter In this way the load will enter into the standard constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR or Unreg Showing CR means the load has been successfully set into the expected constant resistance value showing Unreg means the load couldnot adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the output current of the measured power supplier is in the range of the current value that the expected resistance can absorb If you want to fine tune the constant resistance value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating
154. he output to the same state at last time when the load is turned off or to the OFF state when the electronic load supplier is powered on ON Setting the same state as last time you turned off the eletronic load OFF Setting the output to OFF state when the electronic load is powered on The load will work at CC mode KEY SOUND SET Setting the key sound ON The buzzer will sound when any key was pressed OFF the buzzer will not sound when any key was pressed CONNECT MODE Connect mode MAXTIDLEXING Multi SEPARATE Single BAUDRATE SET Setting the Baudrate 2400 9600 14400 28800 57600 115200 COMM PARITY Setting Comm Parity mode NONE None Parity EVEN Even Parity ODD Odd Parity ADDRESS SET Setting Address Intepro Systems 2012 1 200 The address is the input number 1 200 KEY LOCK SET Setting the keyboard unlocking password when it is 0 or null there is no password set EXIT SYSTEM SET MAX CURRENT SET Setting the maximum current If the maximum current is higher than 3A it is high range Otherwise it is low range MAX VOLTAGE SET Setting the maximum Voltage If the maximum voltage is higher than 20V it is high range Otherwise it is low range MAX POWER SET Setup the Maximum Power TERMINAL SET Choosing the input terminal FRONT Choose the input termina
155. iate automatically The load will turn off the input and Buzzer will sound and VFD display will show OVERHEAT 4 6 Remote Measurement Function When the load consumes high current the power supply will produce voltage drop in the connecting wire between power supply and load accuracy remote measurement terminals are installed at the rear panel of the power supply Users can measure the out put terminals voltage of the instrument under test by the seterminals Before performing the remote sense function you need to set the power supply as the remote measurement mode see thesection 3 6 Menu Function in this manual The remote measurement function can be set by pressing the key Shift O0 Menu When the VFD display shows MENU SYSTEM SET press the key Enterto confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM TERMINAL SEL indicating to set the parameters of the current remote measurement function then press the key Enterto confirm When the VFD display shows TERMINAL SELECT FRONT or TERMINAL SELECT BACK press the Up and Downkeys to select the parameters of remote measurement function Showing TERMINAL SELECT FRONT means input terminals selected is at the front panel and the remote measurement function of the rear panel is closed showing TERMINAL SELECT BACK means input terminals selected is at the rear panel and the remote measurement function of the front panel is
156. ic test is finished users can press the A and vg keys to initiate manually operated test mode Every time press the key A or the key Y once the load will begin to the carrying test of the last step or the next step Users can observe the actual state of every step When the key ON OFF is pressed or a trigger is input the electronic load will automatically exit from the manually operated test mode and start to automatic test again 4 3 Input Control 4 3 1 Short Circuit Operation SHORT Load can simulate a short circuit at the input end by turning the load on with full scale current The short circuit can be toggled on off at the front panel by pressing the key Shift 9 Short Short circuit operation does not influence the current value set When short circuit operation is on OFF state the Load will back to the original setting state The actual current value that the load consumes in short circuit condition is dependent on the working mode and current range of the load that are active In CC CW and CR mode the maximum short circuit current value is 1 2 times of the current range In CV mode short circuit operation is same as the operation of setting constant voltage to OV 4 3 2 Input On Off Operation When the load input state is in ON state you can press the key On Off to change the input state into OFF state Then the right upper corner of the VFD display shows OFF When the load input state is in OFF state you can press the key On Off
157. ically regulated to be the round number times of 20uS 4 1 1 4 Constant Current Shifting into Constant Voltage Mode In constant current shifting into constant voltage mode the measured power supplier can be avoided from current strike damage Load input voltage Picture 4 4 Constant Current Shifting into Constant Voltage Mode When in standard constant current mode press the key Shift 4 CC CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CC TO CV VOL T xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant current shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC CV or Unreg Showing CC CV means the load has been successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant current mode press the key Shift 4 CC CV the load will back int
158. il Status 2 0x0000 or xFFOO CRC Error Check 2 Force Single Coil Example Normal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Coil Address 2 0 OxFFFF Force Data Coil Status 2 0x0000 or OxFFOO CRC Error Check 2 Force Single Coil Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x85 Abnormal Code 1 01 04 CRC Error Check 2 A value of OxFFOO forces the coil to be ON and 0x0000 forces the coil to be turned OFF All other values are invalid and will not affect the coil For example The following example sets the load is in remote control at slave device address 0x01 From table 4 8 7 1 we know that the PC1 remote address is 0x0510 Query 0x01 0x05 0x05 0x00 OxFF 0x00 0x8C OxF6 The Correponding Response 0x01 0x05 0x05 0x00 OxFF 0x00 Ox8C OxF6 3 Read Holding Registers 0x03 Read Holding Registers Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 Starting Address 2 0 OxF FFF No of Points 2 n 1 32 CRC Error Check 2 Read Holding Registers Example Nomal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x03 35 Intepro Systems 2012 Byte Count 1 2 n Data EN CRC Error Chec
159. in standard constant current mode press the key Shift 5 CR CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CR TO CV VOL T xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant resistance shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR CV or Unreg Showing CR CV means the load has been successfully set 16 Intepro Systems 2012 into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant resistance mode press the key Shift 5 CR CV the load will back into the standard constant resistance mode 4 1 3 Constant Voltage Operation Mode CV In this mode the electronic load will attempt to sink enough current to control the source voltage to the programmed value Please refer to the picture 4 7 Note When the voltage of the measured power suppli
160. ing inductance value which is in direct proportion with the rise time of soft start In this mode the measured power supply can be avoided from current strike damage Load current Rising Time T Picture 4 3 Soft Start Current Mode When in standard constant current mode press the key Shift 2 S_Start to enter into the soft start constant current mode When the VFD display shows Rising TM xxxxxxxxvmS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_S or Unreg Showing CC_S means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supplier Intepro Systems 2012 In loading and unloading constant current mode press the key Shift 2 S_ Start the load will back into the standard constant current mode Note The rise time set is automat
161. int key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD Intepro Systems 2012 display will show the word CR_UN or Unreg Showing CR_UN means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supply is in the range of the current value that the expected resistance can absorb In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant resistance mode 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode A I gt U Picture 4 6 Constant Resistance Shifting into Constant Voltage Mode In constant resistance shifting into constant voltage mode the measured power supply can be avoided from current strike damage When in standard constant current mode press the key Shift 5 CR CV to enter into the constant current shifting into c
162. is way the load will enter into the loading and unloading constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_UN or Unreg Showing CV_UN means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the maximum output current of the measured power supply is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 1 V_Level the load will back into the standard constant voltage mode 4 1 3 3 Soft Start Constant Voltage Mode Soft start constant voltage mode functions as a condensive load simulating electric capacity which is in direct proportion with the rise time of soft start In this mode the measured power supply can be avoided from current strike damage VOLT SETTING RISING TIME Picture 4 8 Soft Start Constant Voltage Mode When in standard constant voltage mode press the key Shift 2 S_Start to enter into the soft start constant voltage mode When the VFD display shows RISING TM xxxxxxxxvmsS indicating the current
163. ise time set is automatically regulated to be the round number times of 20uS 4 1 1 4 Constant Current Shifting into Constant Voltage Mode In constant current shifting into constant voltage mode the measured power supply can be avoided from current strike damage Intepro Systems 2012 Load input voltage v Picture 4 4 Constant Current Shifting into Constant Voltage Mode When in standard constant current mode press the key Shift 4 CC CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CC TO CV VOLT xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant current shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC CV or Unreg Showing CC CV means the load has been successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant current mode press the k
164. it will be automatically adjusted to 150V The maximum voltage value of EL97xxB electronic load is 500V When it is beyond 500V it will be automatically adjusted to 500V Besides the maximum voltage value has close relation with the voltage resolution If the maximum voltage value is below 20V the load voltage resolution will be 0 1mV if the maximum voltage value is beyond 20V then the load voltage resolution will be only 1mV 4 5 2 Over Current Protection OC When input current exceeds the current limit Buzzer will sound and VFD display will shows OVER CUR The load maximum voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA indicating the current maximum current value Press the numeric keys and decimal point key to enter the maximum current value required followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum current value of EL9713 electronic load is 120A for the EL9713B is 30A for the EL9714 is 240A and the EL9714B it is 60A When the OC is set beyond the maximum current it will be automatically adjusted to the maximum limit The maximum current value has close relation with the current resolution If the maximum current value is or is below 10 range the load current resolution will be its maximum If the maximum current value is beyond 10
165. ix high speed operation modes CC CR CV CW CC CV CR CV Over current over voltage over power over heat polarity reversed protection High luminance VFD screen with two lines amp four channels display Soft start time setting carrying the power supplier according to the voltage value set Battery testing and short circuit function Available for dynamic testing with rising edge falling edge setting Supporting external trigger input and output External current waveform monitor terminal Supporting remote voltage compensation and multidata storage Power on self test software calibration and standard rack mount Communication mode TTL level Serial communication interface Systems 2012 Intepro Chapter 2 Technical Specifications 2 1 Main Technical Specifications Accuracy 0 1 0 1 FS Model HE M9717 M9717B M9718 M9718B i Power 3600W 3600W 6000W 6000W Input Raitng REMA Current 0 240A 0 120A 0 240A 0 120A Voltage 0 150V 0 500V 0 150V 0 500V Range 0 24A 0 240A 0 12A 0 120A 0 24A 0 240A 0 12A 0 120A res ioma Un Jm ima ZER Resolution ImA 10mA mA 10mA Accuracy 0 05 0 05 FS 0 1 0 05 FS 0 05 0 05 FS 0 1 0 05 FS 0 05 0 05 FS 0 1 0 05 FS 0 05 0 05 FS 0 1 0 05 FS Range 0 1 19 999V 0 1 150V 0 1 19 999V 0 1 500V 0 1 19 999V 0 1 150V 0 1 19 999V 0 1 500V Accuracy 0 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS 0 03 0 05 FS 0 03 0 02 FS 0 03 0 02 FS 0 03 0 02 FS 0 03 0 05 FS CR Mode Range 0 03 2 10K 0 039 5K 0
166. k 2 Read Holding Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x83 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example reads the present voltage value at slave device address 0x01 From table 4 8 7 1 we know that the register address of the present voltage value is OxOBOO Query 0x01 0x03 0x0B 0x00 0x00 0x02 OxC6 Ox2F The Corresponding Nomal Response 0x01 0x03 0x04 0x41 0x20 0x00 0x2A Ox6E 0x1A among which 0x41 0x20 0x00 Ox2A is the read back voltage value the corresponding floating point number is 10V 4 Preset Multiple Registers 0x10 Preset Multiple Registes Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 n 1 32 Byte count 1 2 n Preset Data 2 n CRC Error Check 2 Preset Multiple Registers Example Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x10 Starting Address 2 0 OxFFFF No of Registers 2 N CRC Error Check 2 Preset Multiple Registers Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x90 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example sets the load s constant current IF
167. key Enter to confirm If all the steps set have been edited the VFD display will show EDIT AUTO TEST meaning exit back to the automatic testing function If all the steps set have not been edited the VFD display will show STEP n xxxxx MODE indicating that data of the N step is being edited 4 2 8 2 Setting up Automatic Test Trigger Output Mode Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and keys to get the item SETUP AUTO TEST followed by pressing the Enter key to confirm The load will enter into the automatic test trigger output mode There are the following 4 types of trigger output modes Please press the A and Y keys to select one you wanted followed by pressing the key Enter to confirm Prompting Messenges Explanation TRIGGER WHEN PASS Trigger once when pass the test TRIGGER WHEN FAIL Trigger once when failing the test TRIGGER WHEN TEST END Trigger once when finishing the test TRIGGER DISABLE Trigger disabled Meanwhile the Load will display the following trigger output electrical feature Display Description 25 Intepro Systems 2012 OUTPUT LEVEL When there is a trigger output the voltage level will change from low to high till a key pressed or a trigger input signal arrive the voltage l
168. l at the front panel BACK Choose the input terminal at the back panel EXIT LIST LOAD LIST Choose list files 1 8 EDIT LIST Edit list files MINIMUM TIME Edit minimum time 0 02 1310 7mS LIST MODE LIST output mode CONTINUOUS Continuous mode END HOLD Remains to the last output voltage level after the whole steps are executed successfully END RESET Keep load off state after the whole steps are executed successfully STEP LENGTH Step length 1 200 STEP n 1 whole step length CURRENT Set current TIME Duration EXIT AUTO TEST LOAD AUTO TEST Choose automatic test files 1 8 EDIT AUTO TEST Edit automatic test files STEP LENGTH Set the whole step length STEP n WORK MODE LOAD OFF MODE Load off mode CC MODE Constant current mode CV MODE Constant voltage mode CP MODE Constant power mode CR MODE Constant resistance mode SHORT MODE Short circuit mode Intepro Systems 2012 TEST MODE Qualification testing mode TEST CURRENT Test current TEST VOLTAGE Test voltage TEST POWER Test power TEST RESI Test resistance DELAY TIME Test delay time 0 2 25 5S INPUT xxxx Input the parameters set for example CC mode 1A MINIMUM xxxx Input the minimum lower limit MAXIMUM xxxx Input the maximum upper limit SETUP AUTO TEST TRIGGER Trigger output selection WHEN PASS Trigger once when passing the test WHEN FAIL Trigger once when failing the test WHEN TEST END Trigger output is
169. l point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH B TM xxxxxxxxmsS indicating the current lasting time of current value B set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows FALLING TM xxxxxxxxmsS indicating the current falling time set from value B to value A Press the numeric keys and decimal point key to enter the falling time required followed by pressing the key Enter to confirm Then the load VFD display shows TRANMODE CONTINUOUS TRANMODE PULSE TRNMODE TRIGGER indicating the current dynamic testing operation mode Press the key Aor VW to choose the dynamic testing operation mode you want followed by pressing the key Enter to confirm 4 2 5 Waveform Control 4 2 5 1 Square Wave When the rise time and falling time are both set as zero and the dynamic testing operation mode is set as continuous mode the output wave is square wave The output frequency is the inverse of the lasting time sum of current A and current B Since the minimum accuracy of all the time is set as 20uS the load can read the square wave with the maximum frequency of 25KHz and duty cycle of 50 4 2 5 2 Triangular Wave When the lasting time of both current A and current B are set as zero and the dynamic testing operation mode is continuous mode the output wave is trian
170. lay will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW or Unreg Showing CW means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage of the power supplier is normal and the maximum output current of the measured power supplier is undercurrent If you want to fine tune the constant power value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant power value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 4 2 Loading and Unloading Constant Power Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration 19 Intepro Systems 2012 When in standard constant power mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant po
171. lective encoder knob clockwise Then the right lower corner of the VFD display shows the constant current value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 1 2 Loading and Unloading Constant Current Mode Loading and unloading mode can well protect the measured power supply from damage When the voltage of the measured power supply begins to increase the load will automatically adjust itself to the open circuit state and begin to carry the measured power supply and adjust itself to the current value set only when the voltage of the measured power supply has been increased to the ONSET loading voltage When the voltage of the measured power supply begins to decrease and has been decreased to the OFFSET unloading value the load will automatically adjust itself to the open circuit state If the ONSET loading voltage value is higher than the OFFSET unloading voltage value the load can be avoided from frequent carrying and unloading at the critical point of unloading voltage thus the measured power supply can be well protected U ON SET OFF SET OFF ON OFF Picture 4 2 Loading and Unloading Mode When in standard constant current mode press the key Shift 1 V_Level and e
172. lf test Verify that you have received the following items with your electronic load If anything is missing contact your nearest Sales Office One power cord for your location The user manual One CD only when you have bought communication accessories One communication cable only when you have bought communication accessories First please make sure the electronic load has been correctly connected and powered on Please refer to the following for the detailed operation steps Procedure Display Explanation 1 Power on the SYSTEM SELF TEST The electronic load start power on self test electronic load Vxxx and the VFD display shows the software serial No 2 Wait for 1s after EPROM ERROR EEPROM damage or lost data of last power turn on electronic load off ERROR CAL DATA EEPROM lost calibration data 3 Wait for another 2S XXXXXXXV XXXXXXXA Display the actual input voltage and current once ERROR XXXXXXXW XXXXXXXX_ value actual power value and setting value occurred 3 2 In Case of Trouble If the electronic load fails to run during power on operation the following test will help you to solve the problems that might be encountered 1 Make sure if you have connected the power properly and On Off switch has been pressed 2 Check the power voltage setting There are two voltages which can make load work 110V or 220V Please make sure you get the right voltage in
173. ll show either PASS or FAIL When failure the buzzer will sound At this moment initiate next trigger or press any key to free from the indication of pass or fail When once automatic test is finished users can press the A and vg keys to initiate manually operated test mode Every time press the key A or the key Y once the load will begin to the carrying test of the last step or the next step Users can observe the actual state of every step When the key ON OFF is pressed or a trigger is input the electronic load will automatically exit from the manually operated test mode and start to automatic test again 4 3 Input Control 4 3 1 Short Circuit Operation SHORT Load can simulate a short circuit at the input end by turning the load on with full scale current The short circuit can be toggled on off at the front panel by pressing the key Shift 9 Short Short circuit operation does not influence the current value set When short circuit operation is on OFF state the Load will back to the original setting state The actual current value that the load consumes in short circuit condition is dependent on the working mode and current range of the load that are active In CC CW and CR mode the maximum short circuit current value is 1 2 times of the current range In CV mode short circuit operation is same as the operation of setting constant voltage to OV 4 3 2 Input On Off Operation When the load input state is in ON state you can pres
174. llowing example sets the load s constant current IFIX is 2 3A at slave device address 0x01 From table 4 8 7 1 we know that the IFIX register address is 0x0A01 the floating point takes up two word length Query 0x01 0x10 Ox0A 0x01 0x00 0x02 0x04 0x40 0x13 0x33 0x33 OxFC 0x23 The Corresponding Normal Response 0x01 0x10 0x0A 0x01 0x00 0x02 0x13 OxDO 4 8 7 Coil With The Register Address Allocation Table 1 Coil bit definition Name Address Bit Property Description PC1 0x0500 1 W R When remote control status bit is 1 front key panel unable PC2 0x0501 1 W R When local prohibition bit is 1 not allow to use key Shift 7 to snatch away the front panel control TRIG 0x0502 1 W R Trigger tagged triggered once by software REMOTE 0x0503 1 W R 1 remote input voltage ISTATE 0x0510 1 R Input status 1 input ON 0 intout OFF 35 Intepro Systems 2012 TRACK 0x0511 1 R Tracking status 1 voltage tracking O current tracking MEMORY Ox0512 1 R 1 input state memory VOICEEN 0x0513 1 R 1 key sound ON OFF CONNECT 0x0514 1 R 1 multi O single ATEST 0x0515 1 R 1 Automatic test mode ATESTUN Ox0516 1 R 1 Automatic test pattern waiting to trigger ATESTPASS Ox0517 1 R 1 success automatic test success 0 automatic test failed IOVER 0x0520 1 R 1 over current tag UOVER 0x0521 1 R 1 over voltage tag POVER Ox0522 1 R 1 ov
175. m the menu on the front panel 44 Intepro Systems 2012 2 Data bit 8 3 Stop bit 1 4 Parity none even odd 2 DB9 Serial Interface DB9 Serial Interface 1 5V 2 TXD 3 RXD 4NC 5 GND 6 NC 7NC 8 NC 9NC The output of DB9 interface on the rear panel of the power supply is TTL voltage level so the voltage level shift cable M 131 or M133 must be applied before connecting the DB9 interface with the serial interface on PC M 131 Voltage Level Shift Cable PC VC I 1 RX 2 2 TX 3 3 NC 4 4 GN 5 5 NC 6 6 NC 7 7 NC 8 8 NC O 9 45 46 Intepro Systems 2012 M 133 Voltage Level Shift Cable PC il Z J E 7 E Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 or M133 to connect them Intepro Systems 2012 Quick Reference Safety Please donot install any spare or repair the instrument without permission In order to make sure the normal work of the instrument please have it mended in the maintenance department designated by our company Pease review the following safety precautions before operating our equipment Safety Symbols Please keep in mind the following items which may result in injuries on your body Connect it to safety earth ground using the wire recommended in the user manual High voltage danger Non professionals are forbidden to o
176. minals S S TRQTRI GND S S TRQ TRI GND Piccture4 4 Remote MeasurementTerminals S and S are remote measurementterminals TRQ and TRI are trigger terminals thelast two terminals are ground terminals The output of power supply will beturned off when testing out the change in voltage level from high to low from TRQport which is under the latched mode of the remote control function As amultifunction extended port TRI port is designed for future expanded The following diagram shows the remotesense terminals on the back panel of the instrument 30 Intepro Systems 2012 The following shows wiring diagramfor the remote sensing Wiring diagram for remote sense 4 7 Battery Testing Experiment proves the test with load is the best method to ensure the battery whether work well or not Only with the correct load testing the battery can be confirmed if it was being the expectant life curve location The EL9711 electronic loads can be used to test any type of the battery nowadays As to any battery used either in sheltered equipment or in the uninterrupted service system it is necessary to use the load testing Because the battery is the lowest reliable component it must be tested by the load periodically to ensure the reliability of the battery Capability Test Constant current mode is applied in EL9711 Serial electronic load to test the capability A program is set to control voltage level When the voltage of the battery is
177. mme ee ege Se as ee ea pinky O Picture 3 3 The back panal of EL97 Series electronic load BNC OUT connector 0 full range current in correspond to 0 10V output Oscillograph can be connected by here to observe dynamic waveforms Remote Measuremnt terminals and trigger input output interface Multifunctional communication interface RS232 RS485 USB 3 4 Standard Display The standard display of the instrument as below measured output voltage vale measured output current value atus of the setup values MSTIGE 150V 3000W Maynuo OC ELECTRONIC OAD DREE measured output power value setting values for the current voltage power Intepro Systems 2012 3 5 Keypad Directions 1 _9 0 9 numeric keys Esc Esc key can be exited from any working condition cE Switch to CC mode Setting up a constant current V Set Switch to CV mode Setting up a constant voltage P Set Switch to CW mode Setting up a constant power R Set Switch to CR mode Setting up a constant resistance En Multi purpose Used together with multifunction key to perform diversity functions and applications for example shift Menu can perform menu function Turn on off Load A Increasing setup values A decreasing setup values Enter Confirm key 3 6 Menu Operation Press the key Shift Menu to access to the menu function and theVFD display screen shows the menu items Select the menu items by pressing t
178. mmm om mmm ww mm g EM Du Picture 3 3 The back panal of EL97 Series electronic load BNC OUT connector O full range current in correspond to 0 10V output Oscillograph can be connected by here to observe dynamic waveforms Remote Measuremnt terminals and trigger input output interface Multifunctional communication interface RS232 RS485 USB 3 4 Standard Display The standard display of the instrument is as below Intepro Systems 2012 measured output voltage valye measured output current value atus of the setup values 7 MS7IGE 0 150V 3000W Maynuo OC ELECTRONIC OAD measured output power value setting values for the current voltage power 3 5Keypad Directions i 0 9 numeric keys Esc key can be exited from any working condition Switch to CC mode Esc L t Setting up a constant current Switch to CV mode Setting up a constant voltage Switch to CW mode Setting up a constant power Switch to CR mode Setting up a constant resistance Multi purpose Era Used together with multifunction key to perform diversity functions and applications for example shift Menu can perform menu function On Off Turn on off Load A Increasing setup values Vv decreasing setup values Enter Confirm key 3 6 Menu Operation Press the key Shift Menu to access to the menu function and theVFD display screen show
179. mode short circuit mode and can be edited as the following four types current comparison voltage comparison power comparison and resistance comparison Besides the delay time of each step can also be edited The delay time of each step ranges from 0 1 25 5S considering the quickness and accuracy When automatic test is over the electronic load will indicate if it passes the test or failed If it fails the electronic load will sound alarm Meanwhile the electronic load can be triggered by front panel and TRIGGE IN hardware voltage level in the back panel and can output the trigger voltage level from the TRIGER OUT terminals on back panel You can setup it as the voltage level trigger mode or pulse trigger mode and can have 4 selections of Pass trigger failure trigger finish trigger and disabled trigger 4 2 8 1 Automatic Test Operation 1 Press the key Shift 0 to enter into the menu configuration and then press the A and VW keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and Vv keys to get the item EDIT AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows STEP LENG XX indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confi
180. n function 8 sets of data can be edited at most and 200 steps can be edited in each set of data Users can edit the duration of each step the minimum time of each set of data Please note that the minimum time should be the round numbers of 0 02mS and ranges from 0 02mS to 1310 7mS The duration of each step has something to do with the minimum time you set If the minimum time is set as 0 02mS then the duration of each step ranges from 0 02mS to1310 7mS if the minimum time is set as 2mS then the duration of each step ranges from 2mS to 131070mS 4 2 7 1 List Operation 1 Press the key Shift 0 to enter into the menu operation and then press the A and VW keys to get the item MENU LIST followed by pressing the Enter key to confirm Then press the A and W keys to get the item EDIT LIST followed by pressing the Enter key to confirm Then press the A and YW keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows MINIMUM TM xxxxxx mS indicating the minimum time that requires to be set Since this value affects the fine tuning and operable length of all kinds of waveforms please carefully select the suitable parameters Then press the key Enter to confirm The electronic load will go into the following three output modes LIST CONTINOUS LIST END HOLD and LIST END RESET Press the A and Y keys to select one output mode you wanted followed by pressing the key Enter to confirm
181. nd duty cycle of 50 4 2 5 2 Triangular Wave When the lasting time of both current A and current B are set as zero and the dynamic testing operation mode is continuous mode the output wave is triangular wave The output frequency is the inverse of the sum of the rising time and falling time Since the minimum accuracy of all the time is set as 20uS the load can read the triangular wave with the maximum frequency of 25KHz Since the rising edge and falling edge of the triangular wave are all step wave with 20uS output frequency the ideal degree of triangular wave is in inverse proportion to the its output frequency In extreme situations the triangular wave might function as square wave there are 0 100 accuracy difference according to the different rising time and falling time set 4 2 5 3 Trapezoidal Wave When the four time parameters that need to set are all bigger than zero and the dynamic testing operation mode is continuous mode the load output wave is trapezoidal wave It has the same frequency characteristics with the triangular wave 4 2 6 Trigger Control When dynamic testing operation mode is set as pulse mode or trigger mode the trigger control is initiated There are three trigger modes ay Keypad triggering mode Press the key Shift Trigger to p trigger the electronic load b TTL triggering mode Send a high pulse with a constant time more than 5m Sec to the trigger In terminals in rear panel to trigger the electronic load C
182. ndard RS232 cable Please use IT E131 or M133 to connect them Intepro Systems 2012 Quick Reference Safety Please donot install any spare or repair the instrument without permission In order to make sure the normal work of the instrument please have it mended in the maintenance department designated by our company Pease review the following safety precautions before operating our equipment Safety Symbols Please keep in mind the following items which may result in injuries on your body Connect it to safety earth ground using the wire recommended in the user manual AN High voltage danger Non professionals are forbidden to open the instrument The symbol on an instrument indicates that the user should refer to the operating Instructions located in the manual please wear gloves when you start to opreate and be ware of electronic shock Don t use the equipment at the about personal safety place Certification and Warranty EL97 Series Electrical Loads meet its published specifications at time of shipment from the factory Warranty This instrument product is warranted against defects in material and workmanship for a period of one year from date of delivery Maintenance Service This product must be returned to maintenance department designated by our company for repairing Customer shall prepay shipping charges and shall pay all duty and taxes for products returned to the supplier for warranty service Except for products ret
183. ng CRC To make sure high reliability for the communication we need to set the frame pitch greater than 3 5 times of the transient time of single bit byte Eg When the baud rate is 9600 then the frame pitch time must be greater than 11 3 5 9600 0 004s EL97 series programmable electronic loads provided with double way asynchronous communication fixed 1 bit as the start bit 8 data bit and 1 stop bit Support Non parity check Odd Parity check and even parity check Baudrate could be selected as 2400 9600 14400 28800 57600 115200 1 Setup additional address and communication parameter 32 Intepro Systems 2012 The additional address is a single byte with 16 hexadecimal system data EL97 series electronic loads will only response the request data frame which has the same additional address 2 Setup the additional address Press Shift 0 in turn Enter into the Main Menu the Load will display as MENU CONFIG Press the key Enter to confirm then the load get into CONFIG Menu press A and Y key button to let the load display CONFIG ADDRESS SET then press Enter to confirm the load will display ADDRESS ADDR xxx you can change the address number by press the numeric keys and press the key Enter again to confirm Note The valid additional address number is integers in the range of 1 200 3 Select the check mode Press Shift 0 in turn enter into the main Menu the load will display MENU CONFIG press the key Enter
184. nge the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 20 Intepro Systems 2012 4 1 4 2 Loading and Unloading Constant Power Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant power mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant power mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xXxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW_UN or Unreg Showing CW_UN means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power val
185. nt Set Load current Load voltage yv 4 1 Constant Current Mode 4 1 1 1 Setting up a Standard Constant Current Mode Press the key I SET then the VFD display will show STANDARD CURR xxxxxxxxA the current constant current value Press the numeric keys and decimal point key to enter the constant current value required followed by pressing the key Enter to confirm Then the load will enter into the standard constant current If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC or Unreg Showing CC means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supply If you want to fine tune the constant current value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Note If the constant current value you want to set is beyond the maximum constant current value of the 12 Intepro Systems 2012 load the current value will stop to be increased even if you still rotate the se
186. nt current mode functions as an inductive load simulating inductance value which is in direct proportion with the rise time of soft start In this mode the measured power supply can be avoided from current strike damage Load current Rising Time T Picture 4 3 Soft Start Current Mode When in standard constant current mode press the key Shift 2 S_Start to enter into the soft start constant current mode When the VFD display shows Rising TM xxxxxxxxvmsS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_S or Unreg Showing CC_S means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supply In loading and unloading constant current mode press the key Shift 2 S_ Start the load will back into the standard constant current mode Note The r
187. nter into the loading and unloading constant current mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant current mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC_UN or Unreg Showing CC_UN means the load has successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and 13 Intepro Systems 2012 turned on make sure if the voltage is normal and if the expected constant current value is in the range of the measured power supply In loading and unloading constant current mode press the key Shift 1 V_Level the load will back into the standard constant current mode 4 1 1 3 Soft Start Constant Current Mode Soft start consta
188. nter to confirm Then press the key Esc to escape the Menu item Note The maximum voltage value of EL9711 electronic load is 150V When it is beyond 150V it will be automatically adjusted to 150V Besides the maximum voltage value has close relation with the voltage resolution If the maximum voltage value is below 20V the load voltage resolution will be 0 1mV if the maximum voltage value is beyond 20V then the load voltage resolution will be only imV 28 Intepro Systems 2012 4 5 2 Over Current Protection OC When input current exceeds the current limit Buzzer will sound and VFD display will shows OVER CUR The load maximum voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA indicating the current maximum current value Press the numeric keys and decimal point key to enter the maximum current value required followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum current value of EL9711 electronic load is 30A When it is beyond 30A it will be automatically adjusted to 30A Besides the maximum current value has close relation with the current resolution If the maximum current value is or is below 3A the load current resolution will be 0 01mA If the maximum current value is beyond 3A then the load current resolution will be only 0 1mA 4
189. o Constant Voltage Mode In constant current shifting into constant voltage mode the measured power supply can be avoided from current strike damage Intepro Systems 2012 Load input voltage Picture 4 4 Constant Current Shifting into Constant Voltage Mode When in standard constant current mode press the key Shift 4 CC CV to enter into the constant current shifting into constant voltage mode When the VFD display shows CC TO CV VOL T xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant current shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC CV or Unreg Showing CC CV means the load has been successfully set into the expected constant current value showing Unreg means the load could not adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant current mode press the key Shift 4 CC CV the load will back into the standard constant current mode 4 1 2 Constant Resistant Operation
190. o escape the battery capability test mode V Battery Voltage ee Min voltage Load Sink Current T Picture 4 16 Battery Capability Schema 4 8 Communication protocol 4 8 1 Introduction EL97 series programmable electronic loads work with Modbus protocol The data frame contains 4 parts as follows Salve Address Function Code Data Error Checking CRC 30 Intepro Systems 2012 To make sure high reliability for the communication we need to set the frame pitch greater than 3 5 times of the transient time of single bit byte Eg When the baud rate is 9600 then the frame pitch time must be greater than 11 3 5 9600 0 004s EL97 series programmable electronic loads provided with double way asynchronous communication fixed 1 bit as the start bit 8 data bit and 1 stop bit Support Non parity check Odd Parity check and even parity check Baudrate could be selected as 2400 9600 14400 28800 57600 115200 1 Setup additional address and communication parameter The additional address is a single byte with 16 hexadecimal system data EL97 series electronic loads will only response the request data frame which has the same additional address 2 Setup the additional address Press Shift 0 in turn Enter into the Main Menu the Load will display as MENU CONFIG Press the key Enter to confirm then the load get into CONFIG Menu press A and Y key button to let the load display CONFIG ADDRESS SET
191. o set The recommended delay time is 0 5S Note 25 5S is set as suspended mode So the delay time of a certain step is set as 25 5S the load will stop to be proceeded to the next step until a trigger is input The trigger can be made either by the hardware in the back panel or by pressing the key Shift Trigger or the On Off key in the front panel 6 When the VFD display shows INPUT xxxx xxxxxx indicating the corresponding current value set voltage value set power value set resistance value set in working mode Press the numeric keys to enter the value followed by pressing the key Enter to confirm If in step 3 you choose load off mode or short circuit mode then the electronic load will skip step 6 7 When the VFD display shows MINIMUM xxxx xxxxxx indicating the lower limit of valid comparison press numeric keys to input the value followed by pressing the key Enter to confirm When the VFD display shows MAXIMUM xxxx xxxxxx indicating the upper limit of valid comparison press numeric keys to input the value followed by pressing the key Enter to confirm If all the steps set have been edited the VFD display will show EDIT AUTO TEST meaning exit back to the automatic testing function If all the steps set have not been edited the VFD display will show STEP n xxxxx MODE indicating that data of the N step is being edited 4 2 8 2 Setting up Automatic Test Trigger Output Mode Press the key Shift 0 to enter into the menu configuration
192. o the standard constant current mode 4 1 2 Constant Resistant Operation Mode CR In this mode the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance Please refer to the picture 4 5 Note when the voltage of the measured power supplier is too high and the resistance set is too low it will result in the consumed current higher than the maxim output current of the measured power supplier 14 Intepro Systems 2012 or result in the loads failing to adjust itself automatically to the constant resistance even result in the load shock Load current Slop resistance set gt Load input voltage v Picture 4 5 Constant Resistance Mode 4 1 2 1 Setting up a Standard Constant Resistance Mode Press the key R SET then the VFD display will show STANDARD RESI xxxxxxxxQ indicating the current constant resistance Then Press the numeric keys and decimal point key to enter the constant resistance value required followed by pressing the key Enter In this way the load will enter into the standard constant resistance mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR or Unreg Showing CR means the load has been successfully set into the expected constant resistance value showing Un
193. ode or short circuit mode then the electronic load will skip step 4 5 When the VFD display shows DELAY TM xx xS indicating the delay time of each step The valid range of the delay time is 0 1 25 5S The lower value you set the shorter time the test needs But in certain circumstances too lower value may affect the test results because the test has been finished before the power supply reaches static state so please carefully select the delay time you wanted to set The recommended delay time is 0 5S Note 25 5S is set as suspended mode So the delay time of a certain step is set as 25 5S the load will stop to be proceeded to the next step until a trigger is input The trigger can be made either by the hardware in the back panel or by pressing the key Shift Trigger or the On Off key in the front panel 6 When the VFD display shows INPUT xxxx xxxxxx indicating the corresponding current value set voltage value set power value set resistance value set in working mode Press the numeric keys to enter the value followed by pressing the key Enter to confirm If in step 3 you choose load off mode or short circuit mode then the electronic load will skip step 6 7 When the VFD display shows MINIMUM xxxx xxxxxx indicating the lower limit of valid comparison press numeric keys to input the value followed by pressing the key Enter to confirm When the VFD display shows MAXIMUM xxxx xxxxxx indicating the upper limit of valid comparison press nume
194. of EL97 Series electronic load Q BNC OUT connector 0 full range current in correspond to 0 10V output Oscillograph can be connected by here to observe dynamic waveforms Remote Measuremnt terminals and trigger input output interface Multifunctional communication interface RS232 RS485 USB 3 4 Keypad Directions 1 0 9 numeric keys Esc key can be exited from any working condition Switch to CC mode Setting up a constant current V Set Switch to CV mode Setting up a constant voltage P Esc cE V Set P Set Switch to CW mode R Set Em Setting up a constant power Switch to CR mode Setting up a constant resistance Multi purpose Used together with multifunction key to perform diversity functions and applications for example shift Menu can perform menu function Intepro Systems 2012 Turn on off Load Increasing setup values A v decreasing setup values E Confirm key 3 5 Menu Operation Press the key Shift Menu to access to the menu function and theVFD display screen shows the menu items Select the menu items by pressing the A and YW keys or by rotating the knob and then press the key Enter to enter in the menu item you wanted Or you can press the key Esc to return to the last menu MENU CONFIG INPUT RECALL Setting t
195. offers users with its novel design rigorous process and attractive cost effectiveness FEATURES Six high speed operation modes CC CR CV CW CC CV CR CV Over current over voltage over power over heat polarity reversed protection High luminance VFD screen with two lines amp four channels display Intellegent fan system will be automatically initiated according to the temperature Soft start time setting carrying the power supply according to the voltage value set Battery testing and short circuit function Available for dynamic testing and rising edge falling edge setting Supporting external trigger input and output External current waveform monitor terminal Supporting remote voltage compensation and multidata storage Power on self test software calibration and standard rack mount RS232 RS485 USB communication interface Intepro Systems 2012 Intepro Systems 2012 Chapter 2 Technical Specifications 2 1 Main Technical Specifications Model M9713 M9713B M9714 M9714B 1200W 1200W Input Raitng 0 240A 0 60A 0 150V 0 500V ange 0 12A 0 120A 3A 0 30A 0 24A 240A 6A 60A C Mods esolution ImA 10mA ImA ImA ImA 10mA mA ImA Accuracy 0 05 0 05 FS 0 1 0 05 FS 03 0 05 FS 0 03 0 05 FS 0 05 0 05 FS 1 0 05 FS 03 0 05 FS 03 0 05 FS ange 0 1 19 999V 0 1 150V 1 19 999V 0 1 500V
196. onstant voltage mode When the VFD display shows CR TO CV VOL T xxxxxxxxV indicating the current constant voltage value press the numeric keys and decimal point key to enter the constant voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the constant resistance shifting into constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CR CV or Unreg Showing CR CV means the load has been successfully set into the expected constant resistance value showing Unreg means the load could not adjust itself to the expected constant resistance value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal In loading and unloading constant resistance mode press the key Shift 5 CR CV the load will back into the standard constant resistance mode 4 1 3 Constant Voltage Operation Mode CV In this mode the electronic load will attempt to sink enough current to control the source voltage to the programmed value Please refer to the picture 4 7 Intepro Systems 2012 Note When the voltage of the measured power supply is lessen than the voltage value set or the maximum input current is beyond the maxim current that the load can absorb the loa
197. ot affect the coil 4 8 4 Function Code Function codes are single byte hex number there are 4 function modes as follows Function Code Description 0x01 Read Coil Status read the data by the bit 0x05 Force Single Coil write the data by the bit 0x03 Read Holding Registers read the data by the word 0x10 Preset Multiple Registers write the data by the word 32 Intepro Systems 2012 4 8 5 Error checking CRC EL97 series load use the Cyclic Redundancy Check CRC The CRC field checks the contents of the entire message The CRC fileld is two bytes containing a 16 bit binary value When the CRC is appended to the message the low order byte is appended first followed by the high order byte The discipline is as follows a Setup one hex CRC register and give the initial value as OxFFFF b Make bitxor for the first byte of the frame date and the lower 8 bit of the CRC register And save the bitxor result into the CRC register c Right move CRC register for 1 byte and check if the lowest bit is 1 if the lowest bit is 1 and then make the bitxor for the CRC register and the fixed data OxA001 d Repeat c for 8 times e Repeat step b c d for the next byte of frame data till the last byte f The last number in the CRC register is the last parity checking result Put it at the end of the frame data and keep the lower 8 bit in the after and higher 8 bit in former 4 8 6 Complete Command Frame Analysis 1 Rea
198. otating clockwise is to increase the value while rotating anti clockwise is to decrease the value Note If the constant voltage value you want to set is beyond the maximum constant voltage value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant voltage value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 3 2 Loading and Unloading Constant Voltage Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant voltage mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant voltage mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOLT xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key Intepro Systems 2012 to enter the unloading voltage value required followed by pressing the key Enter to confirm In th
199. owed by pressing the key Enter In this way the load will enter into the soft start constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_S or Unreg Showing CV_S means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected 18 Intepro Systems 2012 constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the maximum output current of the measured power supply is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 2 S_ Start the load will back into the standard constant voltage mode Note The rise time which is set is automatically regulated to be the round number times of 20uS 4 1 4 Constant Power Operation Mode CW In this mode the electronic loads will consume a constant power Please refer to the picture 4 9 If the load input voltage value increase the load input current will decrease Therefore the load power V I will remain in the power set Load input voltage v2 Vase Power set eee ee T2 iB a Load current Picture 4 9 Constant Power Mode 4 1 4 1 Setting up a Standar
200. owing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supplier is in the range of the current that the expected power can absorb In loading and unloading constant power mode press the key Shift 1 V_Level the load will back into the standard constant power mode 20 Intepro Systems 2012 4 2 Dynamic Testing Operation Dynamic testing operation enables the electronic load to periodically switch between two load levels This function can be used to test the transient characteristics of the measured power supplier Dynamic testing operation can be turned on and off by pressing the key C Shift 4 _Tran_ at the front panel Before you turn on dynamic testing operation you should set all of the parameters associated with dynamic testing operation by pressing the key Sail Sien including Value A A pulse time Rising time from value A to value B Value B B pulse time Falling time from value B to value A and dynamic testing operation mode There are three kinds of dynamic testing operation mode continuous mode pulse mode and trigger mode 4 2 1 Continuous Mode CONTINUOUS In this mode the electronic load will periodically switch between value A and value B when the dynamic testing oper
201. p step 4 5 When the VFD display shows DELAY TM xx xS indicating the delay time of each step The valid range of the delay time is 0 1 25 5S The lower value you set the shorter time the test needs But in certain circumstances too lower value may affect the test results because the test has been finished before the power supply reaches static state so please carefully select the delay time you wanted to set The recommended delay time is 0 5S Note 25 5S is set as suspended mode So the delay time of a certain step is set as 25 5S the load will stop to be proceeded to the next step until a trigger is input The trigger can be made either by the hardware in the back panel or by pressing the key Shift Trigger or the On Off key in the front panel 6 When the VFD display shows INPUT xxxx xxxxxx indicating the corresponding current value set voltage value set power value set resistance value set in working mode Press the numeric keys to enter the value followed by pressing the key Enter to confirm If in step 3 you choose load off mode or short circuit mode then the electronic load will skip step 6 7 When the VFD display shows MINIMUM xxxx xxxxxx indicating the lower limit of valid comparison press numeric keys to input the value followed by pressing the key Enter to confirm When the VFD display shows MAXIMUM xxxx xxxxxx indicating the upper limit of valid comparison press numeric keys to input the value followed by pressing the
202. pen the instrument The symbol on an instrument indicates that the user should refer to the operating Instructions located in the manual please wear gloves when you start to opreate and be ware of electronic shock Don t use the equipment at the about personal safety place Certification and Warranty EL97 Series Electrical Loads meet its published specifications at time of shipment from the factory Warranty This instrument product is warranted against defects in material and workmanship for a period of one year from date of delivery Maintenance Service This product must be returned to maintenance department designated by our company for repairing Customer shall prepay shipping charges and shall pay all duty and taxes for products returned to the supply for warranty service Except for products returned to customer from another country supply shall pay for return of products to customer Limitation of Warranty The foregoing warranty shall not apply to 1 Defects resulting from improper or inadequate maintenance by the Customer 2 Customer supplied software or interfacing 3 Unauthorized modification or misuse 4 Operation outside of the environmental specifications for the product or improper site preparation and maintenance 5 Defects resulting from the circuit installed by clients themselves Attention No inform will be given for any changes in the content of the user s guide Thiscompany reserves the right to interpret
203. ption Preset RFIX Double Optional Multi Registers Preset UCRCV Double Optional Multi Registers Preset CMD 35 Must select Multi Registers Table 20 battery test mode Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset UBATTEND Double Optional 41 Intepro Systems 2012 Preset CMD 38 mandatory Multi Registers Table 21 Dynamic Test Mode Operation Register Value Description Preset IA Double Optional Multi Registers Preset IB Double Optional Multi Registers Preset TMAWD Double Optional Multi Registers Preset TMBWD Double Optional Multi Registers Preset TMTRANRIS Double Optional Multi Registers Preset TMTRANFAL Double Optional Multi Registers Preset MODETRAN 0 2 Optional Multi Registers Preset CMD 25 mandatory Multi Registers Table 22 System parameter setting mode Operation Register Value Description Preset IMAX Double Optional Multi Registers Preset UMAX Double Optional Multi Registers Preset PMAX Double Optional Multi Registers Force Single Coil REMOTE OxFFO0 0x0000 Optional Preset CMD 41 mandatory Multi Registers 4 9 Remote operation The DB9 interface connector on the rear panel of the power supply can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 the following information will tell you how to use the computer to control the output of
204. r is the last parity checking result Put it at the end of the frame data and keep the lower 8 bit in the after and higher 8 bit in former 4 8 6 Complete Command Frame Analysis 1 Read Coil Status 0x01 Read Coil Status Example Query 32 Intepro Systems 2012 Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Starting Address 2 0 OxFFFF NO of Points 2 1 16 CRC Error Check 2 Read Coil Status Example Normal Response Filed Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Byte Count 1 1 2 Data Coil Status n CRC Error Check 2 Read Coil Status Example Abnormal Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x81 Abnormal Code 1 01 04 2 CRC Error Check For example The following example reads the load input state ISTATE of Coil at slave device address 0x01 From table 4 8 7 1 we know that the ISTATE address is 0x0510 Query 0x01 0x01 0x05 0x10 0x00 0x01 OxFC 0xC3 The Corresponding Nomal Response 0x01 0x01 0x01 0x48 0x51 OxBE among which 0x48 is the read back data and its lowest bit is 0 this means the input state ISTATE is OFF 2 Force Single Coil 0x05 Force Single Coil Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x05 Coil Address 2 0 OxFFFF
205. reg means the load couldnot adjust itself to the expected constant resistance value Please check if the measured power supplier has been correctly connected and turned on make sure if the output current of the measured power supplier is in the range of the current value that the expected resistance can absorb If you want to fine tune the constant resistance value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant resistance value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 2 2 Loading and Unloading Constant Resistance Mode Please refer to the 3 1 1 2 illustration for the loading and unloading mode theory When in standard constant resistance mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant resistance mode When the VFD display shows ONSET VOL T XXxXxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to Intepro Systems 2012 enter the loading voltage value required followed by pressing the key Enter to confirm
206. ric keys to input the value followed by pressing the key Enter to confirm If all the steps set have been edited the VFD display will show EDIT AUTO TEST meaning exit back to the automatic testing function If all the steps set have not been edited the VFD display will show STEP n xxxxx MODE indicating that data of the N step is being edited 4 2 8 2 Setting up Automatic Test Trigger Output Mode Press the key Shift 0 to enter into the menu configuration and then press the A and YW keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and YW keys to get the item SETUP AUTO TEST followed by pressing the Enter key to confirm The load will enter into the automatic test trigger output mode There are the following 4 types of trigger output modes Please press the A and keys to select one you wanted followed by pressing the key Enter to confirm Prompting Messenges Explanation TRIGGER WHEN PASS Trigger once when pass the test TRIGGER WHEN FAIL Trigger once when failing the test TRIGGER WHEN TEST END Trigger once when finishing the test TRIGGER DISABLE Trigger disabled Meanwhile the Load will display the following trigger output electrical feature Display Description OUTPUT LEVEL When there is a trigger output the voltage level will change from low to high till a key pressed or a trigger input signal arrive the voltage l
207. rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_S or Unreg Showing CV_S means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the maximum output current of the measured power supply is in the range of the maximum current that the load can absorb 19 Intepro Systems 2012 In loading and unloading constant voltage mode press the key Shift 2 S_ Start the load will back into the standard constant voltage mode Note The rise time which is set is automatically regulated to be the round number times of 20uS 4 1 4 Constant Power Operation Mode CW In this mode the electronic loads will consume a constant power Please refer to the picture 4 9 If the load input voltage value increase the load input current will decrease Therefore the load power V 1 will remain in the power set Load input voltage v2 eee Power set T2 iB
208. rm Meanwhile the electronic load can be triggered by front panel and TRIGGE IN hardware voltage level in the back panel and can output the trigger voltage level from the TRIGER OUT terminals on back panel You can setup it as the voltage level trigger mode or pulse trigger mode and can have 4 selections of Pass trigger failure trigger finish trigger and disabled trigger 4 2 8 1 Automatic Test Operation 1 Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and V keys to get the item EDIT AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows STEP LENG XX indicating the step length that requires to be set Then press the numeric keys to input the step length you want to set followed by pressing the key Enter to confirm Please note that the step length should be the round numbers of 1 50 3 When the VFD display shows STEP 1 xxxxx MODE indicating the working mode selected in the step 1 press the A and W keys to select one mode from he following six working modes followed by pressing the key Enter to confirm Working Prompting Explanation Mode Messenges Load Off LOAD OFF MODE Compare the voltages when in load off mode Mode CC Mode CC M
209. rm Please note that the step length should be the round numbers of 1 50 3 When the VFD display shows STEP 1 xxxxx MODE indicating the working mode selected in the step 1 press the A and W keys to select one mode from he following six working modes followed by pressing the key Enter to confirm Working Prompting Explanation Mode Messenges Load Off LOAD OFF MODE Compare the voltages when in load off mode Mode CC Mode CC MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CV Mode CV MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison 24 Intepro Systems 2012 CP Mode CP MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CR Mode CR MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison Short Circuit SHORT MODE Compare the current when in short circuit mode Mode 4 When the VFD display shows STEP 1 TEST xxxx indicating the test types There are four test types test current test voltage test power test resistance Press the A and W keys to select one from those four types followed by pressing the key Enter to confirm If in last step step 3 you choose load off mode or short circuit mode then the electronic load will ski
210. rminals S S and trigger input output terminal GND terminal Multifunctional communication connector for RS232 RS485 USB It is 9 Pin serial port interface connector and utilizes 5 volt TTL logic signals Do not connect an M131 cable with standard RS 232 voltages on the cables connectors Doing so may damage the instrument and is not covered by WARRANTY 3 4 Standard Display The standard display of the instrument as below AU measured output voltage value measured output current value atus of the setup values MGT IGE KS Maynuo OC E measured output power value setting values for the current voltage power 3 5 Keypad Directions 1 _9 0 9 numeric keys Esc Esc key can be exited from any working condition L ei Switch to CC mode Setting up a constant current Intepro Systems 2012 V Set Switch to CV mode Setting up a constant voltage P Set Switch to CW mode Setting up a constant power R Set Switch to CR mode Setting up a constant resistance EA Multi purpose Used together with multifunction key to perform diversity functions and applications for example shift Menu can perform menu function Turn on off Load Increasing setup values A v decreasing setup values Ea Confirm key 3 6 Menu Operation Press the key Shift Menu to access to the menu function and the VFD display screen shows the menu items Select the menu items b
211. s the key On Off to change the input state into OFF state Then the right upper corner of the VFD display shows OFF When the load input state is in OFF state you can press the key On Off to change the input state into ON state Then the right upper corner of the VFD display shows ON indicating the current working state 4 4 Electronic Load Operation Range Electronic load works in the range of Rated Current Rated voltage and Rated Power Please refer to the picture 4 13 and picture 4 14 27 Intepro Systems 2012 Picture 4 13 Electronic Load Power Range Electronic load Mode Change Software Maximum Power Set Software Maximum Current Set Picture 4 14 Software Maximum Setting Value 4 5 Protection Functions Electronic load includes the following protection functions 4 5 1 Over Voltage Protection OV If input voltage exceeds the voltage limit load will turn off the input Buzzer will sound and the VFD display shows Over Volt The load maximum voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM UMAX xxxxxxxx Vindicating the current maximum voltage value then enter the maximum voltage value required by pressing the numeric keys and decimal point key followed by pressing the key E
212. s the menu items Select the menu items by pressing the A and W keys or by rotating the knob and then press the key Enter to enter in the menu item you wanted Or you can press the key Esc to return to the last menu MENU Intepro Systems 2012 CONFIG INPUT RECALL Setting the output to the same state at last time when the load is turned off or to the OFF state when the electronic load supply is powered on ON Setting the same state as last time you turned off the eletronic load OFF Setting the output to OFF state when the electronic load is powered on The load will work at CC mode KEY SOUND SET Setting the key sound ON The buzzer will sound when any key was pressed OFF the buzzer will not sound when any key was pressed CONNECT MODE Connect mode MAXTIDLEXING Multi SEPARATE Single BAUDRATE SET Setting the Baudrate 2400 9600 14400 28800 57600 115200 COMM PARITY Setting Comm Parity mode NONE None Parity EVEN Even Parity ODD Odd Parity ADDRESS SET Setting Address 1 200 The address is the input number 1 200 KEY LOCK SET Setting the keyboard unlocking password when it is 0 or null there is no password set EXIT SYSTEM SET MAX CURRENT SET Setting the maximum current If the maximum current is higher than 3A it is high range Otherwise it is low range MAX VOLTAGE SET Set
213. s to make adjustment until the VFD display shows SYSTEM TERMINAL SEL indicating to set the parameters of the current remote measurement function then press the key Enter to confirm When the VFD display shows TERMINAL SELECT FRONT or TERMINAL SELECT BACK press the Up and Down keys to select the parameters of remote measurement function Showing TERMINAL SELECT FRONT means input terminals selected is at the front panel and the remote measurement function of the rear panel is closed showing TERMINAL SELECT BACK means input terminals selected is at the rear panel and the remote measurement function of the front panel is closed Then press the key Esc to escape the Menu item Note At any time either the input terminals at the front panel or at the back panel is initiated It is impossible to initiate the input terminals both at the front panel and at the back panel together If the voltage of the load is near to zero point and does not change according to the signal please check if the wire mode matches the parameters of the remote measurement function 4 7 Battery Testing Experiment proves the test with load is the best method to ensure the battery whether work well or not Only with the correct load testing the battery can be confirmed if it was being the expectant life curve location The EL9711 electronic loads can be used to test any type of the battery nowadays As to any battery used either in sheltered equipment or in the uninterrupted servic
214. s which may result in injuries on your body Connect it to safety earth ground using the wire recommended in the user manual AN High voltage danger Non professionals are forbidden to open the instrument Ab The symbol on an instrument indicates that the user should refer to the operating Instructions located in the manual Please wear gloves when you start to opreate and be ware of electronic shock Don t use the equipment at the about personal safety place Certification and Warranty EL97 Series Electrical Loads meet its published specifications at time of shipment from the factory Warranty This instrument product is warranted against defects in material and workmanship for a period of one year from date of delivery Maintenance Service This product must be returned to maintenance department designated by our company for repairing Customer shall prepay shipping charges and shall pay all duty and taxes for products returned to the supply for warranty service Except for products returned to customer from another country supply shall pay for return of products to customer Limitation of Warranty The foregoing warranty shall not apply to 1 Defects resulting from improper or inadequate maintenance by the Customer 2 Customer supplied software or interfacing 3 Unauthorized modification or misuse 4 Operation outside of the environmental specifications for the product or improper site preparation and maintenance 5 Defects re
215. se the communication will fail You can change the baud rate and communication address from the front panel or from computer 1 Baud rate 9600 4800 9600 19200 38400 which are selectable from the menu on the front panel 2 Data bit 8 3 Stop bit 1 4 Parity none even odd 2 DB9 Serial Interface DB9 Serial Interface 1 5V 2 TXD 3 RXD 4 NC 5 GND 6 NC 7 NC 8 NC 9 NC The output of DB9 interface on the rear panel of the power supply is TTL voltage level so the voltage level shift cable M 131 or M133 must be applied before connecting the DB9 interface with the serial interface on PC M 131 Voltage Level Shift Cable PC 44 Intepro Systems 2012 Oo OO JO OG GO b i O OO JO OG GO Ne M 133 Voltage Level Shift Cable PC O mM zl CAN fn Va thd NM eR Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 or M133 to connect them 45 Intepro Systems 2012 Quick Reference Safety Please donot install any spare or repair the instrument without permission In order to make sure the normal work of the instrument please have it mended in the maintenance department designated by our company Pease review the following safety precautions before operating our equipment Safety Symbols Please keep in mind the following item
216. seaeeeeaesaaeseaeesaeecaeseaeesaeeeesaees 34 4 8 6 Complete Command Frame Analyse 34 4 8 7 Coil with the Register Address Allocation 37 4 8 8 The Definition Of The Command Register CMD 39 4 8 9 Common Operation Function Description 39 4 9 Remoteroperatlony sisi eatae n a a a N tibetan Eege AIR tence 43 4 9 1 M 131 or M 133 Communication Cable cc ccccceeceeeteeeeeeeeeceeeeaeeeeaeeaaeesaeesaeecaeesaesneeseeeaees 43 4 9 2 Communication between Power Supply and DC 44 Quick References E 47 Intepro Systems 2012 Chapter 1 Overview The EL97XX series programmable DC electronic load is a new generation product from Intepro Systems Incorporating high performance chips the EL97XX series delivers high speed and high accuracy with a resolution of 0 1 mV and 0 01 mA basic accuracy is 0 03 and basic current rise speed is 2 5 A us EL97XX series has wide application from production lines for cell phone chargers cell phone batteries electronic vehicle batteries switching power supplies linear power supplies and LED drivers to research institute automotive electronic aeronautic and astronautic maritime solar cell and fuel cell etc test and measurement applications FEATURES Six high speed operation modes CC CR CV CW CC CV CR CV Over current over voltage over power over heating and polarity reversal protection eHigh luminance vacuum fluorescent display VFD screen with two line four channel display Intelligent
217. set followed by pressing the key Enter to confirm Please note that the step length should be the round numbers of 1 50 3 When the VFD display shows STEP 1 xxxxx MODE indicating the working mode selected in the step 1 press the A and YW keys to select one mode from he following six working modes followed by pressing the key Enter to confirm Working Prompting Explanation Mode Messenges Load Off LOAD OFF MODE Compare the voltages when in load off mode Mode CC Mode CC MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CV Mode CV MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CP Mode CP MODE Choose one of four types current comparison voltage comparison power comparison and resistance comparison CR Mode CR MODE Choose one of four types current comparison 25 Intepro Systems 2012 voltage comparison power comparison and resistance comparison Short Circuit SHORT MODE Compare the current when in short circuit mode Mode 4 When the VFD display shows STEP 1 TEST xxxx indicating the test types There are four test types test current test voltage test power test resistance Press the A and YW keys to select one from those four types followed by pressing the key Enter to confirm If in last step step 3 you choose load off m
218. set UMAX Double Optional Multi Registers Preset PMAX Double Optional Multi Registers Force Single Coil REMOTE OxFFO0 0x0000 Optional Preset CMD 41 mandatory Multi Registers 4 9 Remote operation The DB9 interface connector on the rear panel of the power supplier can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 the following information will tell you how to use the computer to control the output of the power supplier Before carrying out the remote operation mode please use the voltage level shift cable M 131 or M 133 provided by our company for M 131 or M 133 can not only transform TTL voltage level into RS232 signal but also connect the DB9 interface connector with computer s serial interface 4 9 1 M 131 or M 133 Communication Cable The DB9 interface connector on the rear panel of electronic load is TTL voltage level you can use the communication cable M 131 or M 133 to connect the DB9 interface connector of the electronic load and 43 Intepro Systems 2012 the RS 232 interface connector of computer for the communication Please refer to the following picture for M 131 or M 133 Picture4 9 2 M 133 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 to connect them 4 9 2 Communication between Power Supply and PC The
219. ss the key On Off to change the input state into ON state Then the right upper corner of the VFD display shows ON indicating the current working state 27 Intepro Systems 2012 4 4 Electronic Load Operation Range Electronic load works in the range of Rated Current Rated voltage and Rated Power Please refer to the picture 4 13 and picture 4 14 Picture 4 13 Electronic Load Power Range Electronic load Mode Change Software Maximum Power Set Software Maximum Current Set Picture 4 14 Software Maximum Setting Value 4 5 Protection Functions Electronic load includes the following protection functions 4 5 1 Over Voltage Protection OV If input voltage exceeds the voltage limit load will turn off the input Buzzer will sound and the VFD display shows Over Volt The load maximum voltage value can be set by pressing the key Shift O0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM UMAX xxxxxxxx Vindicating the current maximum voltage value then enter the maximum voltage value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item 28 Intepro Systems 2012 Note The maximum voltage value of EL9711 electronic load is 150V When it
220. sulting from the circuit installed by clients themselves Attention 46 Intepro Systems 2012 No inform will be given for any changes in the content of the user s guide thiscompany reserves the right to interpret 47 Intepro Systems 2012 USER MANUAL Programmable DC Electronic Load Models EL97 Series Including EL9715 EL9715B EL9716 EL9716B EL9716E Intepro Systems 2012 Intepro Systems 2012 Content USER Nee e E Nae A uit Lak a candle i Chapter EEN 1 er EE 2 2 1 Main Teheran eet a n eeh 2 2 2 Electronic Load Dimension DE 4 Gh apter Ee Eeer leede EES 5 3 1 Ge Ee EE 5 Sie GASES Of Eeer ees 5 Oro Gi ein ele 6 OA SLAC AN DIS AY EE 7 3 5K ypad EENEG 8 ER EE Op ratio EE 8 Ghapter 4 eet ebe Ante earadct tele cede 12 4 1 Beer EE ee 12 4 1 1 Constant Current Operation Mode CC 12 4 1 1 1 Setting up a Standard Constant Current Mode eececeeseeseeeeseeteeeeneeeeseeeeeeeees 12 4 1 1 2 Loading and Unloading Constant Current Mode 13 4 1 1 3 Soft Start Constant Current Mode desctinpareidinianhinoamsiannianns 14 4 1 1 4 Constant Current Shifting into Constant Voltage Mode cc eceseseseeteeseeeeeee 14 4 1 2 Constant Resistant Operation Mode CH 15 4 1 2 1 Setting up a Standard Constant Resistance Mode ee ceeceeceeeeteeseeeeteeseeeeeeees 16 4 1 2 2 Loading and Unloading Constant Resistance Mode s sssesssesesesesesesesesesesesesesss 16 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode cee cceee
221. supplier from damage When the voltage of the measured power supplier begins to increase the load will automatically adjust itself to the open circuit state and begin to carry the measured power supplier and adjust itself to the current value set only when the voltage of the measured power supplier has been increased to the ONSET loading voltage When the voltage of the measured power supplier begins to decrease and has been decreased to the OFFSET unloading value the load will automatically adjust itself to the open circuit state If the ONSET loading voltage value is higher than the OFFSET unloading voltage value the load can be avoided from frequent carrying and unloading at the critical point of unloading voltage thus the measured power supplier can be well protected U ON SET OFF SET OFF ON OFF Picture 4 2 Loading and Unloading Mode When in standard constant current mode press the key Shift 1 V_Level and enter into the loading and unloading constant current mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load
222. t Control 4 3 1 Short Circuit Operation SHORT Load can simulate a short circuit at the input end by turning the load on with full scale current The short circuit can be toggled on off at the front panel by pressing the key Shift 9 Short Short circuit operation does not influence the current value set When short circuit operation is on OFF state the Load will back to the original setting state The actual current value that the load consumes in short circuit condition is dependent on the working mode and current range of the load that are active In CC CW and CR mode the maximum short circuit current value is 1 2 times of the current range In CV mode short circuit operation is same as the operation of setting constant voltage to OV 4 3 2 Input On Off Operation When the load input state is in ON state you can press the key On Off to change the input state into OFF state Then the right upper corner of the VFD display shows OFF When the load input state is in OFF 26 Intepro Systems 2012 state you can press the key On Off to change the input state into ON state Then the right upper corner of the VFD display shows ON indicating the current working state 4 4 Electronic Load Operation Range Electronic load works in the range of Rated Current Rated voltage and Rated Power Please refer to the picture 4 13 and picture 4 14 Picture 4 13 Electronic Load Power Range Software Maximum Power Set Software Maximum Elec
223. t IMAX Double Optional Multi Registers Preset UMAX Double Optional Multi Registers Preset PMAX Double Optional Multi Registers Force Single Coil REMOTE OxFFO0 0x0000 Optional Preset CMD 41 mandatory Multi Registers 4 9 Remote operation The DB9 interface connector on the rear panel of the power supplier can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 the following information will tell you how to use the computer to control the output of the power supplier Before carrying out the remote operation mode please use the voltage level shift cable M 131 or M 133 provided by our company for M 131 or M 133 can not only transform TTL voltage level into RS232 signal but also connect the DB9 interface connector with computer s serial interface 4 9 1 M 131 or M 133 Communication Cable The DB9 interface connector on the rear panel of electronic load is TTL voltage level you can use the communication cable M 131 or M 133 to connect the DB9 interface connector of the electronic load and the RS 232 interface connector of computer for the communication Please refer to the following picture for M 131 or M 133 42 Intepro Systems 2012 Picture4 9 2 M 133 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 to connect them 4 9 2
224. t Mode 4 1 1 1 Setting up a Standard Constant Current Mode Press the key SET then the VFD display will show STANDARD CURR xxxxxxxxA the current constant current value Press the numeric keys and decimal point key to enter the constant current value required followed by pressing the key Enter to confirm Then the load will enter into the standard constant current If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC or Unreg Showing CC means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supplier has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supplier Intepro Systems 2012 If you want to fine tune the constant current value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Note if the constant current value you want to set is beyond the maximum constant current value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner
225. t Operation Lahn ee ee Zeect 27 4 3 2 np t On Off Op ratlON EE 27 4 4 Electronic Load Operation EE geed 28 4 5 Protection ie el EE 28 4 5 1 Over Voltage Protection IIe deer ees aetna scaciie tak ianed 28 4 5 2 Over Curent Protection QC EE 29 4 5 3 Over Power Protection EN A EE 29 4 5 4 Input Polarity Reversed EE 29 4 5 5 Ov r Heat Protection LE EE 30 4 6 Remote Measurement Function s seseeesesesesesesesesesesesesesesesesesesesesesessssssssesesesesesesesesesesesesese 30 4 7 Battery Ee 31 4 8 Communication d te tee Ol EE 32 AT WEA CUNO DEE 32 4 8 2 SOLU AUC EE 33 FDS Data Ee 33 4 8 4 Function Code EE 33 4 8 5 Err rehecking CRO EE 33 4 8 6 Complete Command Frame Analyse 34 4 8 7 Coil with the Register Address Allocation ccc ccescssesecsessscseeeecsseeeceseeseeseeseseeseeeees 36 4 8 8 The Definition Of The Command Register CMD ccc cceccsseesceeeeeeteeseeeeseeseeeeeees 39 4 8 9 Common Operation Function Description 39 GR eeleren GE EE 43 4 9 1 M 131 or M 133 Communication CGable ccc eccecceeeseseeseeseeeseeeceeseeeeeeseeseeeeseeees 43 4 9 2 Communication between Power Supply and PC 44 Eeer 47 Intepro Systems 2012 Chapter 1 Overview EL97series DC electronic load as a new generation product of Maynuo Electronical Co Ltd is designed with high performance chips high speed high accuracy and with resolution of 0 1 Mv and 0 01 mA the basic accuracy is 0 03 the basic current rise speed is 2 5 A us EL97
226. t the item LOAD AUTO TEST followed by pressing the Enter key to confirm Then press the A and Y keys to select the sequential code defined as the automatic test function you want to execute followed by pressing the Enter key to confirm Then the upper right corner of the VFD display shows AUT n meaning the n automatic test list will be initiated The bottom right of the VFD If users have prepared all things well press the key On Off to initiate the automatic test The automatic test can also be initiated by lowering the voltage level of TRIG IN port and lasting more than 5mS When in testing the right lower corner of the VFD display will show WAIT or STAY meaning waiting for testing or staying in the suspended mode respectively Please retrigger it so that it goes on testing After testing the right lower corner of the VFD display will show either PASS or FAIL When failure the buzzer will sound At this moment initiate next trigger or press any key to free from the indication of pass or fail When once automatic test is finished users can press the A and VY keys to initiate manually operated test mode Every time press the key A or the key Y once the load will begin to the carrying test of the last step or the next step Users can observe the actual state of every step When the key ON OFF is pressed or a trigger is input the electronic load will automatically exit from the manually operated test mode and start to automatic test again 4 3 Inpu
227. t to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 3 2 Loading and Unloading Constant Voltage Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant voltage mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant voltage mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOLT xxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the 17 Intepro Systems 2012 unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_UN or Unreg Showing CV_UN means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected cons
228. tage mode constant power mode constant resistance mode short circuit mode and can be edited as the following four types current comparison voltage comparison power comparison and resistance comparison Besides the delay time of each step can also be edited The delay time of each step ranges from 0 1 25 5S considering the quickness and accuracy When automatic test is over the electronic load will indicate if it passes the test or failed If it fails the electronic load will sound alarm Meanwhile the electronic load can be triggered by front panel and TRIGGE IN hardware voltage level in the back panel and can output the trigger voltage level from the TRIGER OUT terminals on back panel You can setup it as the voltage level trigger mode or pulse trigger mode and can have 4 selections of Pass trigger failure trigger finish trigger and disabled trigger 4 2 8 1 Automatic Test Operation 1 Press the key Shift 0 to enter into the menu configuration and then press the A and W keys to get the item MENU AUTO TEST followed by pressing the Enter key to confirm Then press the A and W keys to get the item EDIT AUTO TEST followed by pressing the Enter key to confirm Then press the A and V keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows STEP LENG XX indicating the step length that requires to be set Then press the numeric keys to input the step length you want to
229. tant resistance value showing Unreg means the load couldnot adjust itself to the expected constant resistance value Please check if the measured power supply has been correctly connected and turned on make sure if the output current of the measured power supply is in the range of the current value that the expected resistance can absorb If you want to fine tune the constant resistance value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Then the right lower corner of the VFD display shows the constant resistance value you set among which a cursor shows under one number meaning this number requires fine tuning If users want to change the fine tuning accuracy just press the rotary encoder knob in which a key is included Every time when you press the rotary encoder once the cursor will move forward to the previous number 4 1 2 2 Loading and Unloading Constant Resistance Mode As for the loading and unloading mode theory please refer to the 3 1 1 2 illustration When in standard constant resistance mode press the key Shift 1 V_Level to enter into the constant loading and unloading constant resistance mode When the VFD display shows ONSET VOL T xXxXxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm
230. tant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the maximum output current of the measured power supplier is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 1 V_Level the load will back into the standard constant voltage mode 4 1 3 3 Soft Start Constant Voltage Mode Soft start constant voltage mode functions as a condensive load simulating electric capacity which is in direct proportion with the rise time of soft start In this mode the measured power supplier can be avoided from current strike damage VOLT SETTING RISING TIME Picture 4 8 Soft Start Constant Voltage Mode When in standard constant voltage mode press the key Shift 2 S_Start to enter into the soft start constant voltage mode When the VFD display shows RISING TM xxxxxxxxvmsS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter In this way the load will enter into the soft start constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_S or Unreg Showing CV_S means the load has been successfully s
231. ter 4 Panel Operation DEE 11 4 1 Basic Operation Mode 11 4 1 1 Constant Current Operation Mode CC 11 4 1 1 1 Setting up a Standard Constant Current Mode 11 4 1 1 2 Loading and Unloading Constant Current Mode sesseseseeseesesseseesessesesseseeseseese 12 4 1 1 3 Soft Start Constant Current Mode cc ceccccesecseeseesceeseeseesceeeeeseeeseeeeenaeeaeeeseeaes 13 4 1 1 4 Constant Current Shifting into Constant Voltage Mode cececeeseseeeeeteeeee 13 4 1 2 Constant Resistant Operation Mode CH 14 4 1 2 1 Setting up a Standard Constant Resistance Mode ccccecseeseeseeeeeseeeeeeeeees 15 4 1 2 2 Loading and Unloading Constant Resistance Mode ccecceeseeseeseeeeeeeeteeees 15 4 1 2 3 Constant Resistance Shifting into Constant Voltage Mode ceceeeeeeeeee 16 4 1 3 Constant Voltage Operation Mode CH 16 4 1 3 1 Setting up a Standard Constant Voltage Mode oe eceeceeeceeeeeseeeseeseeeeeeseeees 17 4 1 3 2 Loading and Unloading Constant Voltage Mode ssssesssesseeseeseseesessesesseseeseseese 17 4 1 3 3 Soft Start Constant Voltage Mode cscsscsssssteerscsseessenssescesscesesetsesceesseseeees 18 4 1 4 Constant Power Operation Mode CW 19 4 1 4 1 Setting up a Standard Constant Power Mode ssssssessssssssessesesseseesessesesseseseseese 19 4 1 4 2 Loading and Unloading Constant Power Mode ssssssssssssssesessessesessesesseseseseese 20 42 Dynamic Testing Operations oree Sasii
232. tery Testing EE 29 4 8 ELTERE EE 30 ABN dree eene a a a a a A E a 30 4 8 2 Set p Ba drate ee 31 e E EE 32 Ee EE HEET Dese eet 32 Elte ech 32 4 8 6 Complete Command Frame Analysis cccccecseseescsseseeseseeseecceeseescceseeseeseecaeeaeeeeneeaees 32 4 8 7 Coil With The Register Address Allocation ce cccscssesecssesscseeescsseeesesessessecseseeeseesees 35 4 8 8 The Definition Of The Command Register CHMI ccc cccccsseeseeeeeeeeeseeeeseeseeeesees 38 4 8 9 Common Operation Function Description eee eceetsesecseeeecseeeeceeeeeeseeseeseeseeseeneeeees 38 4 9 Remote operation WE 42 4 9 1 ENEE Ate later tee E 42 4 9 2 Communication between Power Supply and PC 43 ERUN d ee eene gdb lean demented Sakae ad tee omen loads 46 Intepro Systems 2012 Chapter 1 Overview EL97series DC electronic load as a new generation product of Maynuo Electronical Co Ltd is designed with high performance chips high speed high accuracy and with resolution of 0 1 Mv and 0 01 mA the basic accuracy is 0 03 the basic current rise speed is 2 5 A us EL97 series has a wide application in production line cell phone charger cell phone battery electric vehicle battery Switching power supplier linear power supplier research institutes automotive electronics aeronautics and astronautics ships solar cells fuel cell etc EL97 series offers users with its novel design rigorous process and attractive cost effectivene ss FEATURES S
233. the power supply Before carrying out the remote operation mode please use the voltage level shift cable M 131 or M 133 provided by our company for M 131 or M 133 can not only transform TTL voltage level into RS232 signal but also connect the DB9 interface connector with computer s serial interface 42 Intepro Systems 2012 4 9 1 M 131 or M 133 Communication Cable The DB9 interface connector on the rear panel of electronic load is TTL voltage level you can use the communication cable M 131 or M 133 to connect the DB9 interface connector of the electronic load and the RS 232 interface connector of computer for the communication Please refer to the following picture for M 131 or M 133 Picture4 9 2 M 133 Note It will not work if you connect the DB9 interface connector of the electronic load to the RS232 interface connector of computer directly by a standard RS232 cable Please use IT E131 to connect them 4 9 2 Communication between Power Supply and PC The DB9 interface connector on the rear panel of the electronic load can be transferred to RS232 interface through the voltage level shift cable M 131 or M 133 The following instructions can help you understand how to control the output of power supply by PC 43 Intepro Systems 2012 1 RS232 Setting Before using the remote operation mode please make sure that the baudrate and communication address in power supply are the same as that in the computer software otherwi
234. ti Registers Table 6 Input OFF operation Operation Register Value Description Preset CMD 43 mandatory Multi Registers Table 7 Short circuit operation Operation Register Value Description Preset CMD 26 mandatory Multi Registers Table 8 CC mode operation Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset CMD 1 mandatory Multi Registers Table 9 CV mode operation Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset CMD 2 mandatory Multi Registers Table 10 CW mode operation Operation Register Value Description Preset PFIX Double Optional Multi Registers Preset CMD 3 mandatory Multi Registers Table 11 CR mode operation 39 Intepro Systems 2012 Operation Register Value Description Preset RFIX Double Optional Multi Registers Preset CMD 4 mandatory Multi Registers Table 12 CC mode soft start Operation Register Value Description Preset IFIX Double Optional Multi Registers Preset TMCCS Double Optional Multi Registers Preset CMD 20 mandatory Multi Registers Table 13 CV mode soft start Operation Register Value Description Preset UFIX Double Optional Multi Registers Preset TMCVS Double Optional Multi Registers Preset CMD 39 mandatory Multi Registers Table 14 CC loading and unloading mode Operation Register Value D
235. ting the maximum Voltage If the maximum voltage is higher than 20V it is high range Otherwise it is low range MAX POWER SET Setup the Maximum Power TERMINAL SET Choosing the input terminal Intepro Systems 2012 FRONT Choose the input terminal at the front panel BACK Choose the input terminal at the back panel EXIT LIST LOAD LIST Choose list files 1 8 EDIT LIST Edit list files MINIMUM TIME Edit minimum time 0 02 1310 7mS LIST MODE LIST output mode CONTINUOUS Continuous mode END HOLD Remains to the last output voltage level after the whole steps are executed successfully END RESET Keep load off state after the whole steps are executed successfully STEP LENGTH Step length 1 200 STEP n 1 whole step length CURRENT Set current TIME Duration EXIT AUTO TEST LOAD AUTO TEST Choose automatic test files 1 8 EDIT AUTO TEST Edit automatic test files STEP LENGTH Set the whole step length STEP n WORK MODE LOAD OFF MODE Load off mode CC MODE Constant current mode CV MODE Constant voltage mode CP MODE Constant power mode CR MODE Constant resistance mode SHORT MODE Short circuit mode TEST MODE Qualification testing mode TEST CURRENT Test current TEST VOLTAGE Test voltage TEST POWER Test power TE
236. tronic load Mode Change Current Set Picture 4 14 Software Maximum Setting Value 4 5 Protection Functions Electronic load includes the following protection functions 4 5 1 Over Voltage Protection OV If input voltage exceeds the voltage limit load will turn off the input Buzzer will sound and the VFD display shows Over Volt The load maximum voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows SYSTEM UMAX xxxxxxxx Vindicating the current maximum voltage value then enter the maximum voltage value required by pressing the numeric keys and decimal point key followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item 27 Intepro Systems 2012 Note The maximum voltage value of EL9711 electronic load is 150V When it is beyond 150V it will be automatically adjusted to 150V Besides the maximum voltage value has close relation with the voltage resolution If the maximum voltage value is below 20V the load voltage resolution will be 0 1mV if the maximum voltage value is beyond 20V then the load voltage resolution will be only imV 4 5 2 Over Current Protection OC When input current exceeds the current limit Buzzer will sound and VFD display will shows OVER CUR The load maximum
237. tween two load levels This function can be used to test the transient characteristics of the measured power supplier Dynamic testing operation can be turned on and off by pressing the key C Shitt e Tran JI at the front panel Before you turn on dynamic testing operation you should set all of the parameters associated with dynamic testing operation by pressing the key Sam 1 Sen including Value A A pulse time Rising time from value A to value B Value B B pulse time Falling time from value B to value A and dynamic testing operation mode There are three kinds of dynamic testing operation mode continuous mode pulse mode and trigger mode 4 2 1 Continuous Mode CONTINUOUS In this mode the electronic load will periodically switch between value A and value B when the dynamic testing operation is turned on 2 0ms 3 0ms Picture 4 10 Continuous Operation Mode 20 Intepro Systems 2012 4 2 2 Pulse Mode PULSE In this mode when the dynamic testing operation is turned on the electronic load will switch to value B as receiving one trigger signal taking the pulse time TWD of value B Load will return to Value A TWD TWD 10ms lt 10ms TRIG TRIG 5A Picture 4 11 Pulse Operation Mode 4 2 3 Trigger Mode TRIGGER In this mode when the dynamic testing operation is turned on the electronic load will switch the state between value A and value B once recei
238. ty checking result Put it at the end of the frame data and keep the lower 8 bit in the after and higher 8 bit in former 4 8 6 Complete Command Frame Analysis 1 Read Coil Status 0x01 Read Coil Status Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Starting Address 2 0 OxFFFF NO of Points 2 1 16 CRC Error Check 2 Read Coil Status Example Normal Response Read Coil Status Example Abnormal Response Filed Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x01 Byte Count 1 1 2 Data Coil Status n CRC Error Check 2 Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x81 Abnormal Code 1 01 04 CRC Error Check 2 For example The following example reads the load input state ISTATE of Coil at slave device address 0x01 From table 4 8 7 1 we know that the ISTATE address is 0x0510 Query 0x01 0x01 0x05 0x10 0x00 0x01 OxFC 0xC3 The Corresponding Nomal Response 0x01 0x01 0x01 0x48 0x51 OxBE among which 0x48 is the read back data and its lowest bit is 0 this means the input state ISTATE is OFF 34 Intepro Systems 2012 2 Force Single Coil 0x05 Force Single Coil Example Query Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x05 Coil Address 2 0 OxFFFF Force Data Co
239. ue Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supply is in the range of the current that the expected power can absorb In loading and unloading constant power mode press the key Shift 1 V_Level the load will back into the standard constant power mode 4 2 Dynamic Testing Operation Dynamic testing operation enables the electronic load to periodically switch between two load levels This function can be used to test the transient characteristics of the measured power supply Dynamic testing operation can be turned on and off by pressing the key St A Top 1 at the front panel Before you turn on dynamic testing operation you should set all of the parameters associated with dynamic testing operation by pressing the key Sit vi San including Value A A pulse time Rising time from value A to value B Value B B pulse time Falling time from value B to value A and dynamic testing operation mode There are three kinds of dynamic testing operation mode continuous mode pulse mode and trigger mode 4 2 1 Continuous Mode CONTINUOUS In this mode the electronic load will periodically switch between value A and value B when the dynamic testing operation is turned on 5A 2 0ms 3 0ms 21 Intepro Systems 2012 Picture 4 10 Continuous Operation Mode 4 2 2 Pulse Mode P
240. um Voltage If the maximum voltage is higher than 20V it is high range Otherwise it is low range MAX POWER SET Setup the Maximum Power TERMINAL SET Choosing the input terminal FRONT Choose the input terminal at the front panel BACK Choose the input terminal at the back panel EXIT LIST LOAD LIST Choose list files 1 8 EDIT LIST Edit list files MINIMUM TIME Edit minimum time 0 02 1310 7mS LIST MODE LIST output mode CONTINUOUS Continuous mode END HOLD Remains to the last output voltage level after the whole steps are executed successfully Intepro Systems 2012 END RESET Keep load off state after the whole steps are executed successfully STEP LENGTH Step length 1 200 STEP n 1 whole step length CURRENT Set current TIME Duration EXIT AUTO TEST LOAD AUTO TEST Choose automatic test files 1 8 EDIT AUTO TEST Edit automatic test files STEP LENGTH Set the whole step length STEP n WORK MODE LOAD OFF MODE Load off mode CC MODE Constant current mode CV MODE Constant voltage mode CP MODE Constant power mode CR MODE Constant resistance mode SHORT MODE Short circuit mode TEST MODE Qualification testing mode TEST CURRENT Test current TEST VOLTAGE Test voltage TEST POWER Test power TEST RESI Test resistance DELAY TIME Test delay time
241. urned to customer from another country supplier shall pay for return of products to customer Limitation of Warranty The foregoing warranty shall not apply to 1 Defects resulting from improper or inadequate maintenance by the Customer 2 Customer supplied software or interfacing 3 Unauthorized modification or misuse 4 Operation outside of the environmental specifications for the product or improper site preparation and maintenance 5 Defects resulting from the circuit installed by clients themselves Attention No inform will be given for any changes in the content of the user s guide Thiscompany reserves the right to interpret 47 Intepro Systems 2012 USER MANUAL Models EL97 Series Programmable DC Electronic Load Including EL9713 EL9713B EL9714 EL9714B Intepro Systems 2012 Intepro Systems 2012 Content USER MANYA BEE i Chapter 1 e 1 Chapter 2 Technical Specifications beetebuerg geneet eebe eeben geet Eiere 3 2 1 Main Technical Spechcapnons noia a E A a a E E A E ae 3 2 2 Electronic Load DIMENSION cccccccccccececesseessceescesseeeescesesesesceseseeeeeseeseeesecesecssesssesssaggsaggaaggeags 4 Ghapter S Quick REIGN TEE 5 Sl Power on eege Eege Ee ee ANE 5 3 2 M Case Of Trouble nehet ae eatin ea Eta O EE A EAE E bangauaraedadessebatetenetiobents 5 3 3 Front Panel Operation ass 2 sieves niio ir aves EE E A E E E EA A eed aE 6 SA Standard D ET 7 el DR Te 8 3 6 Menu Operation de EE EE Leeder 8 Chap
242. urrent Mode Press the key I SET then the VFD display will show STANDARD CURR xxxxxxxxA the current constant current value Press the numeric keys and decimal point key to enter the constant current value required followed by pressing the key Enter to confirm Then the load will enter into the standard constant current If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CC or Unreg Showing CC means the load has been successfully set into the expected constant current value showing Unreg means the load couldn t adjust itself to the expected constant current value Please check if the measured power supply has been correctly connected and turned on make sure if the expected constant current value is in the range of the measured power supply If you want to fine tune the constant current value you can rotate the selective encoder knob to adjust the value Rotating clockwise is to increase the value while rotating anti clockwise is to decrease the value Intepro Systems 2012 Note if the constant current value you want to set is beyond the maximum constant current value of the load the current value will stop to be increased even if you still rotate the selective encoder knob clockwise Then the right lower corner of the VFD display shows the constant current value you
243. ut state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_UN or Unreg Showing CV_UN means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supply has been correctly connected and turned on make sure if the voltage is normal and if the maximum output current of the measured power supply is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 1 V_Level the load will back into the standard constant voltage mode 4 1 3 3 Soft Start Constant Voltage Mode Soft start constant voltage mode functions as a condensive load simulating electric capacity which is in direct proportion with the rise time of soft start In this mode the measured power supply can be avoided from current strike damage VOLT SETTING RISING TIME Picture 4 8 Soft Start Constant Voltage Mode When in standard constant voltage mode press the key Shift 2 S_Start to enter into the soft start constant voltage mode When the VFD display shows RISING TM xxxxxxxxvmS indicating the current rising time press the numeric keys and decimal point key to enter the rising time required foll
244. value B to value A Press the numeric keys and decimal point key to enter the falling time required followed by pressing the key Enter to confirm Then the load VFD display shows TRANIMODE CONTINUOUS TRANMODE PULSE TRNMODE TRIGGER indicating the current dynamic testing operation mode Press the key Aor V to choose the dynamic testing operation mode you want followed by pressing the key Enter to confirm 4 2 5 Waveform Control 4 2 5 1 Square Wave When the rise time and falling time are both set as zero and the dynamic testing operation mode is set as continuous mode the output wave is square wave The output frequency is the inverse of the lasting time sum of current A and current B Since the minimum accuracy of all the time is set as 20uS the load can read the square wave with the maximum frequency of 25KHz and duty cycle of 50 4 2 5 2 Triangular Wave When the lasting time of both current A and current B are set as zero and the dynamic testing operation mode is continuous mode the output wave is triangular wave The output frequency is the inverse of the sum of the rising time and falling time Since the minimum accuracy of all the time is set as 20uS the load can read the triangular wave with the maximum frequency of 25KHz Since the rising edge and falling edge of the triangular wave are all step wave with 20uS output frequency the ideal degree of triangular wave is in inverse proportion to the its output frequency In extreme situations
245. ving a triggering signal 5A775 l R TRG TRG Picture 4 12 Trigger Operation Mode 4 2 4 Setting up Dynamic testing operation Parameters Press the key Shift 6 S_Tran then the load VFD display shows LEVEL A CURR xxxxxxxxA indicating the current value A set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH A TM xxxxxxxxmS indicating the current lasting time of current value A set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm Then the load VFD display shows RISING TM xxxxxxxxmS indicating the current rising time set from value A to value B Press the numeric keys and decimal point key to enter the rising time required followed by pressing the key Enter to confirm Then the load VFD display shows LEVEL B CURR xxxxxxxxA indicating the current value B set Press the numeric keys and decimal point key to enter the current value required followed by pressing the key Enter to confirm Then the load VFD display shows WIDTH B TM xxxxxxxxmS indicating the current lasting time of current value B set Press the numeric keys and decimal point key to enter the lasting time required followed by pressing the key Enter to confirm 21 Intepro Systems 2012 Then the load VFD display shows FALLING TM xxxxxxxxmsS indicating the current falling time set from
246. voltage value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA indicating the current maximum current value Press the numeric keys and decimal point key to enter the maximum current value required followed by pressing the key Enter to confirm Then press the key Esc to escape the Menu item Note The maximum current value of EL9711 electronic load is 30A When it is beyond 30A it will be automatically adjusted to 30A Besides the maximum current value has close relation with the current resolution If the maximum current value is or is below 3A the load current resolution will be 0 01mA If the maximum current value is beyond 3A then the load current resolution will be only 0 1mA 4 5 3 Over Power Protection OW When input power exceeds the power limit buzzer will sound and VFD display will show OVER POW Users need to press any key to get the load work normally Note if the current input state is in OFF state you need to press the key ON OFF to make the load work normally If the over power problem is not solved the load will shows OVER POW again The load maximum power value can be set by pressing the key Shift 0 Menu When the VFD display shows MENU SYSTEM SET press the key Enter to confirm Then the VFD display shows SYSTEM IMAX xxxxxxxxA Press the Up and Down keys to make adjustment until the VFD display shows S
247. wed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant voltage mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CV_UN or Unreg Showing CV_UN means the load has been successfully set into the expected constant voltage value showing Unreg means the load couldn t adjust itself to the expected constant voltage value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the maximum output current of the measured power supplier is in the range of the maximum current that the load can absorb In loading and unloading constant voltage mode press the key Shift 1 V_Level the load will back into the standard constant voltage mode 4 1 3 3 Soft Start Constant Voltage Mode Soft start constant voltage mode functions as a condensive load simulating electric capacity which is in direct proportion with the rise time of soft start In this mode the measured power supplier can be avoided from current strike damage VOLT SETTING RISING TIME Intepro Systems 2012 Picture 4 8 Soft Start Constant Voltage Mode When in standard constant voltage mode press the key Shift 2 S_Start to enter into the soft start constant voltage mo
248. wer mode When the VFD display shows ONSET VOL T xxxxxxxxV indicating the current loading voltage press the numeric keys and decimal point key to enter the loading voltage value required followed by pressing the key Enter to confirm Then the VFD will shows OFFSET VOL T XxxxxxxxV indicating the current unloading voltage Press the numeric keys and decimal point key to enter the unloading voltage value required followed by pressing the key Enter to confirm In this way the load will enter into the loading and unloading constant power mode If the input state is in OFF state then the right upper corner of the VFD display will show the word OFF Press the key On Off to change the input state into ON state Then the right upper corner of the VFD display will show the word CW_UN or Unreg Showing CW_UN means the load has been successfully set into the expected constant power value showing Unreg means the load couldn t adjust itself to the expected constant power value Please check if the measured power supplier has been correctly connected and turned on make sure if the voltage is normal and if the output current of the measured power supplier is in the range of the current that the expected power can absorb In loading and unloading constant power mode press the key Shift 1 V_Level the load will back into the standard constant power mode 4 2 Dynamic Testing Operation Dynamic testing operation enables the electronic load to periodically switch be
249. y PC control software triggering mode 4 2 7 List Function The electronic load is available of list operation function 8 sets of data can be edited at most and 200 steps can be edited in each set of data Users can edit the duration of each step the minimum time of each set of data Please note that the minimum time should be the round numbers of 0 02mS and ranges from 0 02mS to 1310 7mS The duration of each step has something to do with the minimum time you set If the minimum time is set as 0 02mS then the duration of each step ranges from 0 02mS to1310 7mS if the minimum time is set as 2mS then the duration of each step ranges from 2mS to 131070mS 4 2 7 1 List Operation 1 Press the key Shift 0 to enter into the menu operation and then press the A and W keys to get the item MENU LIST followed by pressing the Enter key to confirm Then press the A and Y keys to get the 23 Intepro Systems 2012 item EDIT LIST followed by pressing the Enter key to confirm Then press the A and YW keys to select the sequential code that need to be set followed by pressing the Enter key to confirm 2 When the VFD display shows MINIMUM TM xxxxxx mS indicating the minimum time that requires to be set Since this value affects the fine tuning and operable length of all kinds of waveforms please carefully select the suitable parameters Then press the key Enter to confirm The electronic load will go into the following three output modes LIST CONTINOUS LIS
250. y pressing the A and YW keys or by rotating the knob and then press the key Enter to enter in the menu item you wanted Or you can press the key Esc to return to the last menu MENU CONFIG INPUT RECALL Setting the output to the same state at last time when the load is turned off or to the OFF state when the electronic load supplier is powered on ON Setting the same state as last time you turned off the eletronic load OFF Setting the output to OFF state when the electronic load is powered on The load will work at CC mode KEY SOUND SET Setting the key sound ON The buzzer will sound when any key was pressed OFF the buzzer will not sound when any key was pressed CONNECT MODE Connect mode MAXTIDLEXING Multi SEPARATE Single BAUDRATE SET Setting the Baudrate Intepro Systems 2012 2400 9600 14400 28800 57600 115200 COMM PARITY Setting Comm Parity mode NONE None Parity EVEN Even Parity ODD Odd Parity ADDRESS SET Setting Address 1 200 The address is the input number 1 200 KEY LOCK SET Setting the keyboard unlocking password when it is 0 or null there is no password set EXIT SYSTEM SET MAX CURRENT SET Setting the maximum current If the maximum current is higher than 3A it is high range Otherwise it is low range M
251. you can change the address number by press the numeric keys and press the key Enter again to confirm Note The valid additional address number is integers in the range of 1 200 3 Select the check mode Press Shift 0 in turn enter into the main Menu the load will display MENU CONFIG press the key Enter to confirm the load will get into CONFIG menu press A and Y key button to let the load display CONFIG COMM PARITY press Enter to confirm then the load will display COMM PAR xxxxx you can select the parity check mode by pressing A and key button and then press Enter to confirm 4 8 2 Setup Baudrate Press Shift 0 in turn the load will display MENU CONFIG Press Enter to confirm the load will enter into CONFIG menu press A and Y key button to let the load display CONFIG BAUDRATE SET press Enter to confirm the load will display BUADRATE xxxxx you can choose the appropriate baudrate as you need and press Enter to confirm Totally 6 different baudrate was provided for selection 2400 9600 14400 28800 57600 115200 4 8 3 Data In some data frame the date length is fixed but there are some data frame length is not fixed According to Modbus protocol in the data field all the hex data and floating point number are formed as the High Byte in the former and Low byte in the after Addition the output value of force single coil must be 0x0000 or OxFFOO 0x0000 means OFF while OxFFOO means ON All other values are invalid and will n
252. your location The user s manual One CD only when you have bought communication accessories One communication cable only when you have bought communication accessories At first please make sure the electronic load has been correctly connected and powered on Please refer to the following for the detailed operation steps Procedure Display Explanation 1 Power on the SYSTEM SELF TEST The electronic load start power on self test electronic load VXXX and the VFD display shows the software serial No 2 Wait for 1s after EPROM ERROR EEPROM damage or lost data of last power turn on electronic load off ERROR CAL DATA EEPROM lost calibration data 3 Wait for another 2S mx XXXXXxxA Display the actual input voltage and current once ERROR XXXXXXXW XXXXXXXX value actual power value and setting value occurred 3 2 In Case Of Trouble If electronic load fails to run during power on operation the following test will help you to solve the problems that might be encountered 1 Make sure if you have connected the power properly and On Off switch has been pressed 2 Check the power voltage setting There are two voltages which can make load work 110V or 220V Please make sure you get the right voltage in accordance to the voltage in your area 3 Check the fuse of load If fuse is blowout please change another fuse with the following specification Intepro Systems 2012

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