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Series 985 User`s Manual, Feb 1993

1. Shielded cables should be used for all low power signal lines to protect from magnetic and electrostatic coupling of noise Some simple pointers are e Whenever possible low level signal lines should be run unbroken from signal source to the control circuit e Connect the shield to the control circuit common at the control end only Never leave the shield unconnected at both ends Never connect both shield ends to a common or ground e If the shield is broken at some termination point and then continued on the shield must be connected to maintain shield continuity If the shield is used as a signal return no electrostatic shielding should be assumed If this must be done use a triaxed cable electrostatically shielded coaxial cable Twisted pair wire should be used any time control circuit signals must travel over two feet or when they are bundled in parallel with other wires The size or gauge of wire should be selected by calculating the maximum circuit current and choosing the gauge meeting that requirement Using greatly larger wire sizes than required generally will increase the likelihood of electrostatic capacitance coupling of noise Install and Wire Chapter 2 WATLOW Series 980 985 User s Manual 7 Wiring Guide e Groundloops must be eliminated in the entire control system There are obvious loops which can be spotted by studying the as built wiring diagram There are also the not so obvious ground loops t
2. RTD input 2 or 3 wire platinum 100 ohm 0 C user selectable calibrate to JIS curve 3916 0 003916 0 0039160hm ohm C or DIN curve 3850 0 0038500hm ohm C Sensor break protection de energizes control output to protect system or selectable bumpless transfer to manual operation Grounded or ungrounded sensors F C or process variable units are user selectable Operating ranges user selectable Jt c 32 to 999 F or 0 to 750 C 3 Digit 32 to 1382 F or 0 to 750 C 4 Digit Kt c 328 to 2282 F or 200 to 1250 C T t c 328 to 662 F or 200 to 350 N t c 32 to 2282 F or O to 1250 C PT 2 Platinel2 32 to 2543 F or O to 1395 C 1 RTD 328 to 1112 F or 200 to 600 C 0 1 RTD 99 9 to 392 0 F or 99 9 to 200 0 C 0 5VDC 500 to 3500 units 4 20mA 500 to 3500 units 34 WATLOW Series 980 985 User s Manual Appendix Specifications a Output Heating or Cooling Solid state relay 0 5A 24VAC minimum 253VAC maximum opto isolated zero cross switching _Electromechanical relay Form C 6A 115 230VAC 6A 28VDC 1 8 hp 115VAC 125VA 115VAC Warranted to 100 000 cycles Open collector switched DC signal provides a minimum turn ON voltage of 3VDC into a minimum 500 ohm load maximum ON voltage not greater than 32VDC into an infinite load 1 420mA reverse acting into a 600 ohm maximum load Secondary Output Heat Cool or Alarm Solid state relay 0 5A 24VAC minimum 2
3. RTD Calibration iJ NOTE Not all parameters will appear They are dependent on your unit type Use only the steps that apply to your unit Table 2 RTD Settings Appendix WATLOW Series 980 985 User s Manual 39 JJ NOTE Not all parameters will appear They are dependent on your unit type Use only the steps that apply to your unit 0 5 Volt Field Calibration Procedure Equipment Required Precision voltage source 0 5 volt minimum range with 0 001 volt resolution Setup And Calibration J NOTE Before calibration on an installed control make sure all data and parameters are documented See Setup and Operation Charts Pages 26 and 28 Connect the AC line voltage LI to Terminal 14 L2to Terminal 7 and Ground to Terminal 8 Jumper for correct line voltage See Chapter 2 Connect the voltage current source to Terminal 15 and 17 on the Series 980 985 terminal strip Use regular 20 24 gauge wire Apply power to the unit and allow it to warm up for 15 minutes After warm up put the unit in the CAL menu See Figure 33 on Page 37 Press the MODE key until the OU prompt is displayed IIMPORTANT When the MANUAL LED Is ON the unit is automatically calibrating Your sequence is VERY important Always move to the next prompt before changing the calibration equipment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUAL LED is ON At the OU prompt set
4. p l Series 980 985 Mic roproc essor Ba sed Auto tuning C ontrol PW izats Wanna User s Manual 2 WAVAT LOWY Watlow Controls 1241 Bundy Blvd P O 80x 5580 Winona MN 55987 5580 Phone 507 454 5300 Fax 507 452 4507 W985 MA58 9307 10 00 February 1993 Made in the U S A Supersedes To W985 MA70 9043 Ed Printed on Recycled Paper Use The Manual First Starting Out Install Wire Front Panel Set Up Tuning Appendix for dd NOTE Details of a Note appear here in the narrow box on the outside of each page A CAUTION Details of a Caution appear here in the narrow box on the outside of each page WARNING Details of a Warning appear here in the narrow box on the outside of each page 2 WATLOW Series 9801985 User s Manual How to Use the Manual This manua will make your job easier Reading it and applying the informa tion is a good way to become familiar with the Series 980 985 An overview Chapter 1 Page 4 Chapter 2 Page 6 Chapter 3 Page 22 Chapter 4 Page 24 Chapter 5 Page 29 Specifications Page 34 Cali bration Glossary Warranty Notes The user s manual contains informational notes to alert you to important details When you see a note icon look for an explanation in the margin Pee pe Safety Information This user s manual also has boldface safety information notes to protect both you and your equipmen
5. Warranty 47 Index Warranty Warranty The Watlow Series 980 985 is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use provid ing that the units have not been misapplied Since Watlow has no control over their use and sometimes misuse we cannot guarantee against failure Wat low s obligations hereunder at Watlow s option are limited to replacement repair or refund of purchase price and parts which upon examination prove to be defective within the warranty period specified This warranty does not apply to damage resulting from transportation alteration misuse or abuse Returns We will not accept a return without an RMA number The RMA number must appear on the outside of the carton and on all paperwork Cartons without RMA numbers will be returned Ship on a Freight Prepaid basis 1 You must call Watlow Customer Service 507 454 5300 for a Return Material Authorization RMA number before returning any item for repair We need this information Ship to address Bill to address Contact name Phone number Ship via Your P O number Symptoms and or special instructions iName and phone number of person returning the material 2 You need prior approval and an RMA number from the Customer Service Department when you are returning an unused product for credit Also we must apply a 20 percent restocking charge for all returned stock contr
6. CAL mode Appendix WATLOW Series 980 985 User s Manual 43 Glossary A P Alarm A condition generated by a controller indicating that the process has exceeded or fallen below the set or limit point Anti reset Control feature that inhibits auto matic reset action outside of the proportional band Automatic prompts Data entry points where a microprocessor based control prompts or asks the operator programmer for information input Bumpless transfer When transferring from auto to manual operation the control output s will not change bumpless smooth transition Closed loop Control system that has a sensing device for process variable feedback Cold junction Point of connection between thermocouple metals and the electronic instru ment Cold junction compensation Electronic means used to compensate for the effect of temperature at the cold junction Cycle time The time necessary to complete a full ON through OFF period in a time proportion ing control system Dead band A temperature band between heating and cooling functions Derivative Anticipatory action that senses the rate of change of temperature and compensates to minimize overshoot and undershoot Also rate Deviation The difference between the value of the controlled variable and the value at which it is being controlled Default parameters The parameters or pro grammed instructions which are permanently stor
7. CL Ht operation Will not appear if Pb2 0 ALO Deviation dE 99 to O 3 digit display 99 999 to 0 4 digit display 999 Process Pr rL to AH1 rL AHI Deviation dE 0 to 99 3 digit display 99 Ly 0 to 999 4 digit display 999 Process Pr ALO to rH rH Ctl 1 to 60 seconds 5 seconds Ct2 1 to 60 seconds 5 seconds Appears if Hi CL or CL Ht appea db 99 F 55 C Appears if Ht CL or CL Ht CAL DOO Soome 0 o E AUt 0 3 0 Appears if Od Ht r Lorr Appears if rSP 0 5 or 420 28 WATLOW Series 980 985 User s Manual Setup Chapter 4 Tuning Chapter 5 How to Tune and Operate Tuning Automatic Auto tuning The Series 9801985 gives you the capability to automatically tune f the PID parameters to fit the characteristics of your particular thermal system NOTE Auto tuning is only The auto tuning procedure operates on a thermal response value slow possible in the heat medium or fast A slow thermal response is used when the process tempera mode The cool ture is not met too rapidly or greatly exceeds the set point value A fast thermal output remains off response produces a rapid temperature change over a short period of time Once the auto tune sequence has begun all PID values for both heat and cool are set to 0 and the control goes into an ON OFF mode of control at 90 of the established set point The displayed set point remains unchanged The cool output remains o
8. Reference junction Synonymous with cold junction See Cold junction Reset Control action that automatically elimi nates offset or droop between set point and actual process temperature Also integral Reset windup inhibit Synonymous with anti reset See Anti reset RTD Resistance Temperature Detector Resis tive sensing device displaying resistance versus temperature characteristics Displays positive temperature coefficient Set point Intended value of the process variable Appendix Glossary P Z Switching sensitivity In ON OFF control the temperature change necessary to change the output from full ON to full OFF Thermal System A regulated environment consisting of a heat source heat transfer me dium sensing device and a process variable control instrument Thermocouple Temperature sensing device that is constructed of two dissimilar metals wherein a measurable predictable voltage is generated corresponding to temperature Thermocouple break protection Fail safe operation that assures output shutdown upon an open thermocouple condition Three mode control Proportioning control with reset and rate Time Proportioning Control Action which varies the amount of ON and OFF time when close to the set point i e in the proportional band This variance is proportional to the differ ence between the set point and the actual process temperature In other words the am
9. and Operating Chapter Auto Man Alarms Indication of Auto Manual operation is the LED located on the AUTO MAN key When the LED is ON the control is in the Manual operation an alarm condition is present and the output de energizes When the LED is OFF the control is in AUTO operation and the alarm is energized When the LED flashes press the key again within five seconds to complete the change in operation If the sensor is open and LOC 0 or 1 the Series 985 switches to Manual operation time proportioned power if the output was stable before the break occurred When transferring from auto to manual operation the control output s will not change bumpless smooth transition When transferring from manual to automatic operation the control output s may change significantly In manual the output value power appears in the lower display In automatic operation the set point appears Using Alarms The Series 985 has two alarms types Process or Deviation A Process alarm sets an absolute temperature when the process exceeds that absolute tem perature limit The Process alarm points may be independently set high low or high low A Deviation alarm alerts the operator when the process strays too far from set point The operator can enter independent high and low alarm settings The reference for the deviation alarm is the set point Any change in set point causes a corresponding shift in the deviation alarm Exa
10. burned in before leaving the factory the Series 980 985 is ready to install when you receive it But before you begin working read through this chapter to gain an understand ing of the entire installation Consider sensor installation carefully You ll need to look at the noise reduction guidelines before making your panel cutout Sensor Installation Guidelines We suggest that you mount the sensor at a location in your process or system where it reads an average temperature Put the sensor as near as possible to the material or space that you want to control Air flow past this sensor should be moderate The sensor should be thermally insulated from the sensor mounting Installation Guidelines For Preventing Noise For improved electrical noise immunity install the Series 980 985 as far away as possible from motors relays and other similar noise generators Do not run low power sensor input lines in the same bundle as AC power lines Grouping these lines in the same bundle can create electrical noise interference which may result in error codes in the Series 980 985 The Culprit Most noise problems stem from wiring practices They re the major means of coupling noise from its sources to the control circuit The following information will tell you how to eliminate or decrease noise An Information Resource An outstanding resource for information for wiring guidelines is the IEEE Standard No 518 1982 and is available fr
11. key until the 4A0 prompt is displayed IMPORTANT When the MANUAL LED s ON the unit is automatically calibrating Your sequence is VERY important Always move to the next prompt before changing the calibration equipment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUAL LED is ON At the 4A0 prompt the multimeter should read approximately OmA for 0 20mA units and 4mA for 4 20mA units Allow at least 10 seconds to stabilize Use the UP DOWN keys reverse acting to adjust the reading on the multimeter for 0 0mA 0 1 OmA on 0 20mA units and 4 0mA 0 2mA on 4 20mA units Press the MODE key At the 2A0 prompt the multimeter should read approximately 20mA Allow at least 10 seconds to stabilize Use the UP DOWN keys reverse acting to adjust the reading on the multimeter for 20 0mA 0 10mA on 0 20mA units and 20 0mA 0 2mA on 4 20mA units Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to exit the CAL mode 42 WATLOW Series 980 985 User s Manual Append 0 5 0 10VDC Output 0 5 0 10 Volt Output Field Calibration Procedure Equipment Required JJ NOTE 20K ohm 1 4 watt 10 resistor Not all parameters 4 1 2 digit Digital Multimeter will appear They are dependent on Setup And Calibration your unit type Use only the steps that 2 NOTE apply to your unit Before calibration on an installed control make sure all data and paramete
12. than 70 5 change within the last two minutes the 985 will switch into Manual operation at the last Automatic power level If the control was in MANUAL operation it will remain there You must press the AUTO MAN key twice to see the error code The alarm output if present will be in its alarm state LED lit The Upper display will read The Lower display will indicate the error code If the control was operating with stable output values when the error occurred it will continue to operate at those levels on a power basis If output values were not stable the control outputs will go to 0 power OFF If operator access is LOC 2or 3 The control will remain in AUTO operation The control outputs will go OFF The AUTO MAN and MODE keys are disabled The UP DOWN keys may be used together to enter the Set Up Menu The alarm output if present will be in its alarm state LED lit The Upper display will read The Lower display will indicate the error code To clear a corrected error Cycle power to the control Er 4 amp 5 Errors Control Outputs Will Be OFF Error codes Er 4 and Er 5 will result in these conditions The control is in AUTO operation with both Outputs OFF The alarm output Output 2 if present is in its alarm state de ener gized with the LED lit a The Upper display will indicate the process value The Lower display will indicate the error code All Keys are ina
13. the voltage current source to 0 00 volts Allow at least 10 seconds to stabilize Press the MODE key At the 5U prompt set the voltage current source to 5 00 volts Allow at least 10 seconds to stabilize Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to allow you to exit the CAL mode 40 WATLOW Series 980 985 User s Manual Appendix 4 20mMA Input Field Calibration Procedure Equipment Required Precision current source 0 20mA minimum range with 0 01 mA resolution Setup And Calibration F NOTE Before calibration on an installed control make sure all data and parameters are documented See Setup and Operation Charts Pages 26 and 26 1 Connect the AC line voltage LI to Terminal 4 L2 to Terminal 7 and Ground to Terminal 8 Jumper for correct line voltage See Chapter 2 2 Connect the voltage current source to Terminal 15 and 17 Jumper Terminal 16 to 1 7 on the Series 980 985 terminal strip Use regular 20 24 gauge wire Apply power to the unit and allow it to wam up for 15 minutes After warm up put the unit in the CAL menu See Figure 33 on Page 37 Press the MODE key until the 4A prompt is displayed IMPORTANT When the MANUAL LED is ON the unit is automatically calibrating Your sequence is VERY Important Always move to the next prompt before changing the calibration equlpment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUA
14. 0 20mA Output 1 Wiring 19 0 5VDC Output 1 Wiring 20 S S Relay Output 2 Wiring 21 DC Output Output 2 Wiring 22 6A Mechanical Relay Output 2 Wiring 23 System Wiring Example 24 Series 980 985 Displays 25 Series 980 985 Keys 26 Entering the Set Up Menu 27 The Set Up Menu 28 The Operation Menu 29 Alarm Display Examples 31 Error Code Display Examples 32 The Calibration Menu 33 Calibration Parameters 34 Tables Noise Suppression Device Ratings 1 RTD Settings 2 Charts Set Up Menu Prompts Description 1 Input Ranges 2 Operation Menu Prompts Description 3 WATLOW Seiad HGGES Uzars Manual 3 Starting Out Figure 1 Series 980 985 Input and Output Overview Chapter 1 Starting Out With The Watlow Series 9801985 A Microprocessor Based Control Dual Outputs Single Input PID or ON OFF Type J K T N or Pt2 User Selectable Thermocouple ATD or Process Output 1 Heat Cool LOAD 1 CHLOAD 2 Output 2 Heat Cool or Alarm Output 1 or 2 Percent Power z Output 1 Heating Auto tuning General Description Welcome to the Watlow Series 980 985 a dual output single input micropro cessor based 1 8 DIN auto tuning temperature control featuring the Auto matic Manual capability with bumpless transfer In the Auto mode the control has closed loop control with sensory feedback while the Manual mode has open loop control with user defined output power level The 980 985 accepts a Type J K T N o
15. 3 iThe error code is already in the lowerdisplay Error code definitions and actions Er 1 Sensor overrange error The sensor input is generating a value that is higher than that allowed for the range of this sensor or the A D circuitry is not functioning properly Enter a valid input Er 2 Sensor underrange error The sensor input is generating a value that is lower than that allowed for the range of this sensor or the A D circuitry is not functioning properly Enter a valid input Er 3 Ambient error Check the specification for the ambient temperature range Er 4 Configuration error The unit s microprocessor is faulty call the factory Er 5 Non volatile checksum error The nonvolatile memory checksum has discovered a checksum error Unless a momentary power interruption occurred while the unit was storing data the nonvolatile memory is bad Call the factory Er 7 A D overflow error The A D circuit is over or under range An open or reversed polarity sensor is the most likely cause Check the sensor if it is connected and functioning properly then call the factory To clear a corrected error iCycle power to the control Tuning and Operating Chapter 5 Errors Outputs Er 1 2 3 amp 7 Errors Control Outputs May Be ON lf operator access isLOCQor1 and the control was in AUTO operation when the error occurred it will go into MANUAL power operation If the output power is less
16. 53VAC maximum opto isolated zero cross switching Electromechanical relay Form A 6A 115 230VAC 6A 28VDC 1 8 hp 115VAC 125VA 115VAC Warranted to 100 000 cycles Open collector switched DC signal provides a minimum turn ON voltage of 3VDC into a minimum 500 ohm load maximum ON voltage not greater than 32VDC into an infinite load Accuracy Calibration Accuracy 0 1 of span 1 LSD 77 F 5 F 25 C 3 C ambient amp rated line voltage 10 Accuracy Span 1000 F or 540 C minimum Temperature Stability 0 1 F F 0 1 C C change in ambient 1 Voltage Stability 0 01 of span per percent of rated line voltage Agency Approvals 1 UL recognized File 243684 UL873 CSA file LR30586 Terminals 6 compression type screw terminals Power 115 230VAC 1 0 15 50 60Hz 5 10VA maximum Data retention upon power failure via nonvolatile memory Operating Environment 32 to 1 30 F 0 to 55 C 0 to 90 RH non condensing Dimensions 985 orientation For 980 units switch height and width measurements Height 3 8 in 96 5 mm Width 1 9 in 48 0 mm Overall depth 6 3 in 160 5 mm Behind panel depth 6 0 in 152 5 mm Weight 0 9 Ib 0 4 kg Appendix WATLOW Series 980 985 User s Manual 35 Model No Series 980 985 Model Number Information The Series 980 985 Model Number listed on your unit sticker is defined below DR e Control Series 980 985 Dual output microp
17. ATLOW Series 980 985 User s Manual Install and Wire Chapter 2 Input Wiring Input Options 2 amp 3 RTD 2 Wire Terminals 12 14 Model 98 _A 2_ _0 0000 98 A 3_ _0 0000 Figure 12 Input Options 2 amp 3 RTD 2 wire Sensor Wiring Jumper l3to l4 1 0 Input Options 2 amp 3 RTD 3 Wire Terminals 12 14 Model 98 A 2_ _ 0 0000 Figure 13 98 A 3 0 0000 Input Options 2 amp z Ta 3 RTD 3 wire Sensor Wiring f NOTE Long lead lengths create electrical resistance There will be ag 1 approximate input error for every 1ohm of lead length resistance when using a two wire RTD That resistance when added to the resistance of the RTD element can result in erroneous input to the instrument To overcome this problem use a three wire RTD sensor which compensates for lead length resistance When extension wire is used for a three wire RTD all three extension wires must have the same electrical resistance i e same gauge copper stranded Install and Wire Chapter 2 WATLOW Series 980 985 User s Manual 15 Output 1 Wiring Figure 14 Solid State Relay Output 1 Option B Wiring Diagram Figure 15 DC Output 1 Open Collector Option 72 Wiring Diagram Output 1 Option B Solid State Relay Model 98 A _ B_0 0000 BB SDSS SSSR SE RSS Se Ld Solid State Relay Solid State Relay Watlow s solid state relays change st
18. EK differential for ranges displayed in whole degrees and 0 3 F or 0 17 C for ranges displayed in 0 1 The default is 25 F 13 C If the input type is 0 5VDC or 4 20mA the range of Pb1 is 0 999 0 99 9 or 0 9 99 determined by the value of DEC The switching differential is 0 03 0 3 or 3 units Pb2 default is 0 Po2 only appears with Ht CL or CL Ht operation Reset Enter Reset for Output 1 or 2 adjustable from 0 00 to 9 99 rpts min A fy value of 2 00 rpts min corresponds to an integral time constant of 30 seconds Selecting 0 00 no integral action rE2 only appears with Ht CL or CL Ht fe operation rA X will not appear if Pb X 0 respectively Rate Adjust Rate function for Output 1 or 2 from 0 00 to 9 99 minutes maxi eat 4 mum Selecting 0 00 no derivative action rA2 will only appear with Hi CL or baa CL Ht operation rA X will not appear if Pb X 0 respectively Cycle Time Enter the Cycle Time for each Output adjustable from 1 to 60 cn seconds The default will be 5 seconds Ct1 will not appear if Output 1 is 4 20 ce CT2 only appears with HCL or CL Ht operation Setup Chapter 4 WATLOW Series 980 985 User s Manual 27 Ee D or T Dead Band Enter the Dead Band between the heating and cooling functions adjustable from 99 F 55 C The default is 0 Appears when Ot2 CL Alarm Low Represents the low process alarm or low deviation alarm Displayed only when Ot2 parameter is AL Ala
19. L LED is ON 5 Atthe 4A prompt set the mA source to 4 00mA Allow at least 10 seconds to stabilize Press the MODE key 6 Atthe 20A prompt set the voltage current source to 20 00mA Allow at least 10 seconds to stabilize Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to allow you to exit the CAL mode 4 20mA Input t NOTE Not all parameters will appear They are dependent on your unit type Use only the steps that apply to your unit Appendix WATLOW Series 980 985 User s Manual 41 0 20 4 20mA Output Field Calibration Procedure JJ NOTE Equipment Required Not all parameters will appear They are dependent on 470 ohm 1 2 watt 10 resistor 4 1 2 digit Digital Multimeter your unit type Use Setup And Calibration only the steps that apply to your unit I NOTE Before calibration on an installed control make sure all data and parameters are documented See Setup and Operation Charts Pages 26 and 28 Connect the AC line voltage LI L2 and ground to the proper terminals of the 980 985 See Chapter 2 Connect the multimeter in series with the 470 ohm resistor to Terminal 1 and 3 for 0 20mA units on the Series 980 985 terminal strip Use Terminal l and 2 for 4 20mA units Use regular 20 24 gauge wire Apply power to the unit and allow it to warm_up for 15 minutes After warm up put the unit in the CAL menu Seq Figure 33 on Page 37 Press the MODE
20. ake a look at Figure 2 and at the three different menus Setup Operation and Calibration After you feel comfortable with the names and their functions move on to installation and wiring Configure the 980 985 s features to your application Establish levels of operator Figure 2 Setup access input type units of measure low and Overview of the high range limits and Output 2 configuration Series 980 985 Enter the set point and the PID tuning values O and alarm set points here Parameters for eration proportional band reset rate and cycle time for p Outputs 1 and 2 alarm low and high dead band calibration offset and auto tune are here also Supply various input signals to the Calibration Series 980 985 and it performs auto calibration Calibration procedures should only be attempted with proper equipment and by qualified personnel Where To Go From Here If your Series 980 985 is already installed and wired go directly to How to Use the Keys and Displays Chapter 3 If not turn the page to Chapter 2 How to Install and Wire the Series 980 985 and proceed from there Getting Started Chapter 1 WATLOW Series 980 985 User s Manual 5 Install Wire Chapter D How to Install and Wire the Series 9801985 System Planning This chapter tells you howto installthe Series 980 985 Allmountingand wiring information is right here Because Watlow controls are thoroughly tested and
21. al 4 L2 to Terminal 7 and Ground to Terminal 8 Jumper for correct line voltage See Chapter 2 2 Connect the millivolt source to Terminal 18 Negative and Terminal 20 Positive on the 980 985 terminal strip Use regular 20 24 gauge wire 3 Apply power to the unit and allow it to warm upfor 15 minutes After warm up put the unit in the CAL menu See Figure 33 on Page 37 IMPORTANT When the MANUAL LED is ON the unit is automatically calibrating Your sequence is VERY important Always move to the next prompt before changing the calibration equipment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUAL LED is ON 5 Atthe tcL prompt enter 0 00 millivolts from the millivolt source to the control Allow at least 10 seconds to stabilize Press the MODE key 6 Atthe tcH prompt enter 50 00 millivolts from the millivolt source to the 9801985 Allow at least 10 seconds to stabilize Press the MODE key 7 Atthe tc prompt disconnect the millivolt source and connect the reference compensator orT C calibrator to Terminal 18 Negative and Terminal 20 Positive on the Series 980 985 terminal strip Allow 10 seconds for the control to stabilize Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to allow you to exit the CAL mode Appendix RTD Field Calibration Procedure Equipment Required 1K ohm precision decade resistance box with 0 010h
22. ate Relay Model 98 _A B 0 0000 Figure 21 S S Relay Output 2 Option B Wiring Diagram Solid State Relay Watlow s solid staterelays change state at zero volts which is zero cross switching They are also optically isolated which means the output circuitry is energized by infrared light striking aphoto sensitive device This results in virtual absence of electri cally generated noise plus output to input electrical isolation Off state impedance is 20Kohms minimum Install and Wire Chapter 2 WATLOW Series 980 985 Users Manual 19 Output 2 Wiring Figure 22 DC Output Open Collector output 2 Option C Wiring Diagram Figure 23 6 Amp Mechanical Relay Output 2 Option D Wiring Diagram Output 2 Option C DC Output Open Collector Model 98 _ A C 0 0000 Heat Cool or Alarm I H E i i i E 1 E E i E i i i i Switched DC Watlow s solid state switch is a low current DC output open collector used to switch an external power switching device such as a SSR or an electromechanical relay The input specifications of the power switching device must match those listed for the SS switch output The power switching device must provide isolation between the SS switch output and load power since the SS switch output is a non isolated output Minimum load resistance is 500ohms Available current is9mA minimum and 22mA maximum Output 2 Option D 6 Amp Mec
23. ate at zero volts which is zero cross switching They are also optically isolated which means the output circuitry is energized by infrared light striking a photo sensitive device This results in virtual absence of electi cally generated noise plus output to input electrical isolation Off state impedance is 20Kohm minimum Output 1 Option C DC Output Open Collector Model 98 A _C_0 0000 Switched DC Watlow s solid state switch isa low current DC output open collector used to switch an external power switching device such as anSSR or an electromechanical relay The input specifications of the power switching device must those listed for the SS switch output The power switching device must provide isolation between the SS switch output and load power since the SS switch output is a non isolated output Minimum load resistance is 500ohms Available current is minimum 9mA 22mA maximum 16 WATLOW Series 980 985 User s Manual Install and Wire Chapter 2 Output 1 Wiring Output 1 Option D 6 Amp Mechanical Relay Model 98_A _D _0 0000 Figure 16 6 Amp mechanical Relay Output 1 Optlon D Wiring Diagram Mechanical Relay Mechanical Relay The Electromechanical relay iS an electical and mechanical dayica with moving parts When power is applied to the relay solenoid Contact closure is Created through move ment of the Common Contact of the relay Off state impedance is20Kohm min
24. ctive All Set Up Menu parameters are reset to default values Calibration values 4AO and 2A0O are set to default values All other Calibration Menu values remain unchanged These conditions will occur regardless of the value of LOC or the pres ence of the Set Up or Calibration Menus To clear a corrected error Cycle power to the control Recalibrate the 4 20mA output if applicable see the unit s model Tuning and Operating Chapter 5 WATLOW Series 9801985 User s Manual 33 Specifications Appendix Control Mode Single set point non ramping Single input dual outputs Control outputs User selectable as Heat Heat Heat Heat Cool Cool Cool Cool Heat Alarm Cool Alarm Outputs independent or related via deadband for Heat Cool ON OFF 3 F or 1 7 C switching hysteresis or 0 3 F or 0 17 C for 0 10 Units PID parameters Proportional band 0 to 999 F 0 to 555 C 3 digit only O to 999 F 0 to 555 C or 0 to 99 9 F 0 to 55 5 C 3 or 4 digit Reset 0 00 to 9 99 repeats per minute Rate 0 00 to 9 99 minutes Cycle time 1 to 60 seconds Deadband 99 F 99 units or 55 C 9 9 F 9 9 units or 5 5 for 0 1 decimal units Operator Interface Membrane front panel Three or four digit 0 3 8mm LED diiplays MODE AUTO MANUAL UP and DOWN keys Dual digital displays Input Thermocouple RTD and electrical process input Automatic cold junction compensation for thermocouple
25. display alternately displays information from the current parameter and the LO or HI alarm message at one second intervals The alarm output Output 2 is de energized and the LOAD 2 LED is lit To clear an alarm The alarm condition must first be corrected e If the alarm is latching Clear manually press the AUTO MAN key once as soon as the process temperature is inside the alarm limit by3 F I 7 C for 1 RTD units and 0 3 F 0 17 C for 0 1 RTD units Tuning and Operating Chapter 5 WATLOW Series 980 985 Users Manual 31 Figure 32 Error Code Display Examples NOTE Electrical noise or a noise event vibra tion or excess environmental moisture or tem perature may cause Series 985 errors to occur If the cause of an error is not otherwise apparent check for these 32 WATLOW Series 980 985 User s Manual If the alarm is non latching The alarm will clear itsalf automatically as soon as the process temperature is inside the alarm limit by 3 F I 7 C for 1 RTD units or 0 3 F 017 C for 0 1 RTD units AN CAUTION An alarm display will be masked by an error condition or when the control is in the Calibration or Set Up Menus How To Deal With Error Codes Three dashes in the upper display indicate a Series 985 error If operator access is LOC Oorl iPress the AUTO MAN key twice to see the error code for one second If operator access is LOC 2 or
26. e The Keys And Displays Chapter 3 22 Wire Power For The Series 980 985 13 Wire Input 14 Wire Output 16 Index 46 Information Resource 6 Inputs 14 Installation Guidelines for Preventing Noise 6 Setup Menu and Parameters 24 46 WATLOW Series 980 985 User s Manual K L Keys 23 Fig 27 Line Filtering Configurations 10 Local Remote Set Point 25 28 Lower Display 22 Fig 25 Mi Manual Operation 23 31 Mechanical Relay 6 Amp Output 1 Wiring 17 Fig 16 Output 2 Wiring 20 Fig 23 MODE key 23 Model Number 36 N Mosse Sources 7 Suppression Device amp Ratings 9 Table 1 Operating Chart and Default Parameters 28 Operation Parameters 27 Output 1 Wiring 16 Output 2 Wiring 19 overview of the Series 980 985 5 Fig 2 P Power Wiring 13 Fig 8 9 Preventing Noise Installation Guidelines 6 Process Calibration 40 Process Input 14 Fig 13 Process Output 1 17 19 Fig 17 20 Q R Returns 47 RTD Calibration 39 RTD Sensor Wiring 15 Fig 12 13 S Sensor Wiring 14 15 Fig 10 13 Series 980 985 Input And Output Overview 4 Fig 1 Setup Charts 26 28 Specifications 34 SS Relay Output 1 Wiring 16 Fig 14 Output 2 Wiring 19 Fig 21 Steps To Put Your Control To Work 5 System Planning 6 Wiring Example 21 Fig 24 T Thermocouple Calibration 38 Thermocouple Sensor Wiring 14 Fig 10 Tuning 29 U V W UP DOWN keys 23 Upper Display 22 Fig 25
27. e area for interference pick up Islatrols are availablefrom Control Concepts Corporation 328 Water Street P O Box 1360 Binghamton NY 13902 1360 Phone 607 724 2464 1 101 1A I20VAC I 202 2 5A 208 240V AC 1 105 5A 120VAC 207 7 5A 208 240VAC 1 115 15A 120VAC The ultimate protection is an uninterruptable power supply This senses the A C power line when the line fluctuates a battery powered 60Hz in verted circuit takes over supplying power within one half to one cycle of the A C line very expensive How To Check For Ground Loops To check for ground loops disconnect the ground wire at the ground termina tion Measure the resistance from the wire to the point where it was connected The ohmmeter should read a high ohm value If you have a low ohm value across this gap there is at least one ground loop present in your system Or check for continuity your reading should be open Ifyou do find continu ity you must now begin looking for the ground loops Begin disconnecting grounds in the system one at a time checking for continuity after each discon nection When continuity reads open you have eliminated the ground loop s Also as you reconnect grounds keep making the continuity test It is possible to reconnect a ground loop Noise Suppression Devices Available From Watlow Watlow Controls stocks a few key noise suppression parts You may order these by calling your local Watlow di
28. e in displayed data when pressing UP amp DOWN is ignored At the CAL parameter press the AUTO MANUAL key twice to enter the MANUAL mode Calibration values are not retained unless in MANUAL mode Upon entering the calibration menu the top display window indicates CAL and keys are inactive until all keys are released The upper display continues to indicate CAL with the exception of calibration of the 4 20mA output while the operator walks through the entire calibration parameter list While calibrating the 4 20mA output the upper display contains a numeric value that is slewed up or down until the output value is correct The control uses the lower display to prompt the user as to what the input should be Once the input has been properly established and maintained for at least 10 seconds the MODE key may then be used to display the next prompt After the final input is established another press of the MODE key returns the unit to the configuration menu at the top of the parameter list Cal Restore If you make a mistake in calibrating your control the rSt prompt at the end of the calibration menu restores the original factory calibration settings Simply select yes and press the MODE key The original factory calibration values are restored Figure 34 on the next pages shows the calibration prompt Appendix Calibration A CAUTION Incorrect calibration will affect the accuracy and should only be attempted with proper e
29. ed in microprocessor software to provide a data base DIN Deutsche Industrial Norms a widely recognized German standard for engineering units Display capability In a digital indicating instru ment the entire span that can be indicated if fully utilized 44 WATLOW Series 980 985 User s Manual Droop Difference in temperature between set point and stabilized process temperature Duty cycle Percentage of load ON time relative to total cycle time Hysteresis In ON OFF control the temperature change necessary to change the output from full ON to full OFF Hunting Oscillation or fluctuation of process temperature between set point and process variable input Process variable information being sup plied to the instrument integral Control action that automatically elimi nates offset or droop between set point and actual process temperature Also reset Isolation Electrical separation of sensor from high voltage circuitry Allows for application of grounded or ungrounded sensing element JIS Japanese Industrial Standards Also Japa nese Industrial Standards Committee JISC Establishes standards on equipment and compo nents Offset Adjustment to actual input temperature and to the temperature values the Series 985 uses for display and control ON OFF control Control of temperature about a set point by turning the output full ON below set point and full OFF above set point in the
30. ff for the duration of the tuning Once the control has finished learning the system it returns to standard PID control with the heat PID values being automatically established as a result of the auto tuning The operator must then establish the cool PID values manually Tuning is complete within 40 minutes Any change of the set point while in auto tune re initiates the auto tune procedure To start auto tuning 1 Press the MODE key until the AUt prompt appears in the data display 2 Select a thermal response value 1 slow 2 medium and 3 fast using the UP DOWN keys A thermal response value of 2 will satisfactorily tune most thermal systems 3 Press the MODE key While the control is in the tuning mode the lower display alternately displays the normal information and the prompt At The time between alternations is 1 second 4 When the process is complete the displays return to their previous state and AUt reverts to 0 The appropriate PID tuning parameters are now installed and retained in the non volatile memory To abort auto tuning the operator must reset the AUt parameter to 0 This leaves the unit in an ON OFF heat control state in Auto operation at the dis played set point The auto tuning process may also be aborted by pressing the AUTO MANUAL key twice In both cases all PID values are set to 0 Tuning and Operating Chapter 5 WATLOW Series 980 985 UsersManual 29 Tuning Tuning Manual For optimum c
31. filter out noise generated by devices such as relays relay contacts solenoids motors etc A snubber is a simple filter device using a 0 1 600 volt non polarized capacitor in series with a 100 ohm 1 2 watt resistor The device can be used on A C or D C circuits to effectively dampen noise at its source The general purpose Watlow snubber described above is 0804 0147 0000 For other QUENCHARC sizes contact PAKTRON P O Box 5438 Lynchburg VA 24502 Phone 804 239 6941 Metal Oxide Varistor MOV can be used to limit voltage spikes that occur on the A C supply lines as a result of lightning strikes switching large motors etc The MOV is available in several varieties and for 115 or 230 volt lines The device dissipates the voltage spikes to ground and in doing so repeatedly deteriorates its ability to function MOVs have a limited life Watlow stocks several MOVs See Table 1 8 WATLOW Series 980 985 User s Manual Install and Wire Chapter 2 Noise Guidelines Islatros and other similar powerline filters are designedto carry the power for the control circuit and buffer the control circuit from A C line noise Devices like the Islatrol use media electromagnetic filtering other than electric circuits to filter out electrical noise Take care in matching the power capabilities of the filter with power demands of the circuit Keep line filters as close to the control as possible to minimize th
32. hanical Relay Model 98_A D 0 0000 Mechanical Relay The electromechanical relay is an electrical and mechanical device with moving parts When power is applied to the relay solenoid contact closure is created through move ment of the common contact of the relay Off state impedance is 20K ohms minimum 20 WATLOWSeries 980 985 User s Manual Install and Wire Chapter 2 Wiring Exampl AN WARNING Install high or low temperature limit control protection in systems where an overtemperature fault condition could present a fire hazard or other hazard Failure to install temperature limit control protection where a potential hazard exists could result in damage to equipment and property and injury to personnel D CAUTION Do not jumper load power from the control power terminals Doing so will cause your control to be more susceptible to electrical interference from loadswitching See Noise Guidelines at the beginning of this chapter Figure 24 System Wiring 115 Volt Example Control Power Earth 12L Ground D 2 CAUTION With Watlow mercury relays load must have a unity power factor For RESISTIVE LOADS ONLY NOTE All fuses must be selected for proper protection in a given application Load Power HighLiiit Control Power LI L2 integral Serpol Q 140A 16XX 6000 Hi gh Limit Control L2 LI Relay Contactor coilPower Limit Sensor Process Sens
33. hat result from the technique of connecting internal circuit commons in the manufacturer s equipment An example of this would be if a control circuit is designed to work with a grounded sensor input Do not daisy chain A C power or return lines or output signal or return lines to multiple control circuits Use a direct line from the power source to eachinputrequiring A C power Avoid paralleling L1 power lead and L2 return lead to load power solenoids contactors and control circuits If L1 power lead is used to switch a load L2 return lead will have the same switched signal and could couple unwanted noise into a control circuit Grounding the chassis of each piece of equipment in the system is very important The simple practice of connecting each individuai chassis to the overall equipment chassis immediately adjacent to that piece and then tie all the major chassis ground terminals together with one lead usually green wire to ground at one single point will work best Don tconnect ground to the control case if the control is mounted in grounded enclosure prevent ground loops Do not confuse chassis grounds safety ground with control circuit commons or with AC supply lines L2 return or neutral line Each return system wiring must be kept separate Be absolutely sure chassis ground safety is never used as a conductor to return circuit current How To Eliminate Noise Use snubbers QUENCHARC to
34. heat mode Open loop Control system with no sensory feedback The Series 980 985 uses closed loop Output Action in response to difference between set point and process variable Overshoot Condition where temperature exceeds setpoint due to initial power up or process changes P control Proportioning control Parameter A physical property whose value determines the response of an electronic control to given inputs Appendix PD control Proportioning control with rate action Pl control Proportioning control with auto reset PID control Proportioning control with auto reset and rate Process varlable Thermal system element to be regulated such as time temperature relative humidity etc Programmed display data Displayed informa tion which gives the operator programmer the programmed or intended process information i e intended set point intended alarm limit etc See Actual displayed data Proportlonal band Span of temperature about the set point where time proportional control action takes place Proportloning control See Time Proportioning Control Rate Anticipatory action that senses the rate of change of temperature and compensates to minimize overshoot Also derivative Rate Band A thermal control band that defines where the rate derivative function begins A Watlow rate band occurs centered on set point at one or more times the width of the proportional band
35. ight touch decreases the value by one Holding the key down decreases the displayed value at a rapid rate New data is self entering in5 seconds Where To Go From Here Now that you know how to read the keys and displays continue to Chapter 4 to MODE Key Steps the control through the Operating menu also in the Auto mode enters new data selected less than5 seconds previously A EE lii fee eet Auto Manual LED Keys Disp lays Figure 27 Series 980 985 Keys AUTO MAN Key Pressed once it clears any latched alarms If the key is pressed again within 5 seconds the control toggles between the Auto and Manual mode While in the Manual mode percent power is always displayed in the lower display Lit when the control is in Manual opera tion Press the key twice to enter Auto operation A blinking Auto Manual LED indicates that pressing the Auto Manual key toggles between Auto and Manual After 5 seconds without pressing the Auto Manual key the LED stops blinking and returns to its previous state begin entering data and setting up your Series 980 985 Keys and Displays Chapter 3 WATLOW Series 980 985 User s Manual 23 a NOTE While in the Setup menu all outputs are OFF Figure 27 Entering the Setup Menu Figure 28 The Setup Menu J NOTE When using a process input such as 0 5VDC or 4 20mA the rL and rH settings scale the display to match the measured
36. imum Output 1 Option E 0 10 VDC Model 98 A _E _0 0000 Figure 17 0 10VDC Output 1 Option E Wiring Diagram Process Output Proportional value determined by the Control to balance the sensor input and set point This value will fall between 0 10VDC depending on your process output type Install and Wire Chapter 2 WATLOW Series 980 985 User s Manual 17 Output 1 Wiring Figure 18 4 20mA Output 1 Option F Wiring Diagram Figure 19 0 20mA Output 1 Option G Wiring Diagram Output 1 Option F 4 20mA Model 98 A _F _0 0000 pT Process Output Proportional value determined by the control to balance the sensor input and set point This value will fall between4 20mA depending on your process output type Output 1 Option G O 20mA Model 98_A _G _0 0000 Process Output Proportional value determined by the control to balance the sensor input and set point This value will fall between 0 20mA depending on your process output type 18 WATLOW Series 980 985 User s Manual Install and Wire Chapter 2 2 Wirin g Output 1 amp Output 1 Option H O 5VDC Model 98 A _H _0 0000 Figure 20 0 5VDC Output 1 Option H Wiring Diagram Process Output Proportional value determined by the control to balance the sensor input and set point This value will fall between 0 5VDC depending on your process output type Output 2 Option B Solid St
37. ions For Controls How To Install The Series 980 985 How To Wire The Series980 985 System Wiring Example Chapter 3 How To Use The Keysand Displays Series 980 985 Displays amp Load LED s Series 980 985 Keys Chapter 4 How To Set Up The Series 980 985 Entering Set Up Menu Set Up Parameters Set Up Menu Operation Parameters Operation Menu Chapter 5 How To Tune And Operate Tuning Manual Tuning Automatic Manual and Automatic Operation Using Alarms How To Deal With Error Codes Appendix Specifications Model Number Information Calibration Menu Calibration Procedures Glossary Index Returns Shipping Claims Warranty Watlow Controls to Use the Manual Figures Table Charts page 4 5 10 10 10 12 12 13 13 14 14 15 15 16 16 1 17 18 18 19 19 20 20 21 22 23 24 24 27 31 32 37 38 26 26 28 Item Figure Series 980 985 Input amp Output Overview 1 Overview of the Series 980 985 2 Differential Mode Filter Wiring 3 Common Mode Fifter Wiring 4 Combination filter Wiring 5 Series 980 985 Panel Cutout Dimensions 6 Series 980 985 Dimensions 7 115 VAC Power Wiring 8 230 VAC Power Wiring 9 Thermocouple Wimg Diagram 10 Process Wiring Diagram 11 RTD 2 wire Wiring Diagram 12 RTD 3 wire Wiring Diagram 13 Solid State Relay Output 1 Wiring 14 DC Output 1 Open Collector Wiring 15 6 Amp Relay Output 1 Wiring 16 O IOVDC Output 1 Wiring 17 4 20mA Output 1 Wiring 18
38. mmon Mode Filter Wiring CoM birn Fitter Line Load Control 10 WATLOW Series 980 985 Users Manual Install and Wire Chapter 2 installation How to Install the Series 980 985 Figures 6 7 and 8 provide the Series 980 985 s panel cutoutand dimensions Do not however make your panel cutout until you are sure that you are placing the control in the best location Read the noise guidelines at the beginning of this chapter before installing and wiring the Series 980 985 1 Place the panel cutout in the desired location Figure 6 shows you the panel cutout dimensions 2 Toinstall carefully insert the Series 980 985 into the panel cutout Push P NOTE the unit in until the bezel is seated securely against the panel Removing the Series 980 985 chassis 3 Included with your control are two adjustable mounting brackets one for the from its case may top and one for the bottom of the control case Installing the mounting make mounting brackets requires access to the back side of the panel easier On the top and bottom of the case are a series of slots running the length of the case The first two shorter slots are for attaching the mounting brack ets Figure 8 shows a side view with both mounting brackets 4 Loosen the mounting bracket screws with a Phillips screwdriver far enough to allow for the panel thickness 5 Make sure that each bracket is placed in the first two slots from the front of the control with
39. mple If your set point is 100 F and you have a deviation alarm set at 7 F as the high limit and 5 F as the low limit the high alarm will trip at 107 F and the low alarm at 95 F If you change the set point to 130 F the alarms will follow the set point and trip at Figure 31 137 F and 125 F Alarm Display Examples Alarm Silencing for alarm output A1 is available with the deviation alarm This overrides alarm A1 during power up The non latching mode automatically enables alarm output A1 on initial power up In the latching mode the operator must manually disable the alarm by pressing the AUTO MAN key once In both cases alarm silencing disables the A1 alarm output relay but the A1 LED displays the alarm condition until the process value is within the safe region of the deviation alarm band Once the process value crosses into the safe region both a latching or a non latching alarm is ready Any future deviation outside this safe band triggers an alarm Both Process and Deviation alarms can be latching or non latching The operator must manually reset a latching alarm before the alarm will reset The Press once operator must also remove the condition that created the alarm When the Clear operator removes the condition causing the alarm a non latching alarm auto a latched matically resets the alarm output and corrected Flashing LO or HI in the lower display indicates an alarm alarm The Lower
40. ms resolution Setup And Calibration tj NOTE Before calibration on an installed control make sure all data and parameters are documented See Setup and Operation Charts Pages 26 and 28 1 Connect the AC line voltage Li to Terminal 4 L2 to Terminal 7 and Ground to Terminal 8 Jumper for correct line voltage See Chapter 2 2 Connect the decade resistance box to Terminal 12 13 and 14 on the terminal strip Use regular 20 24 gauge wire of the same length and type 3 Apply power to the unit and allow it to warm up for 15 minutes After warm up put the unit in the CAL menu See Figure 33 on Page 37 Press the MODE key until the rLO prompt is displayed IMPORTANT When the MANUAL LED is ON the unit is automatically calibrating Your sequence is VERY important Always move to the next prompt before changing the calibration equipment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUAL LED is ON 5 Atthe rLO prompt set the decade resistance box to the correct low setting See the table below Allow at least 10 seconds to stabilize Press the MODE key Calibration Low High 985A 2XX0 0X00 17 31 317 33 985A 3XX0 0X00 59 57 177 13 6 Atthe rH prompt set the decade resistance box to the correct high setting Allow at least 10 seconds to stabilize Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to allow you to exit the CAL mode
41. ndent Ht or CL e E Ht CL ALor no Pr or dE Dependent on Ot2 AL LAt or nLA Dependent on Ot2 AL OFF or On Appears if Ot2 AL amp ALt dE JIS or din Appears if In rtd or rtd Input Type Sensor Range Low Sensor Range High Chart 2 shi Input Ranges J 32 F 0 C 999 F 750 C 3 digit 32 F 0 C 1 382 F 750 C 4 digit 328F 200 2282 F 1250 C t 22 F 200 C BBP FASrC n 32F 0 C 2282 F 1 250 C Pt2 32 F O C 2543 F I395 C rtd 19 328 F 200 C 111 2 F 600 C rtd 0 1 99 9 F 99 9 392 0 9F 200 00 0 5 VDC 5 00 50 0 500 35 00 350 0 3500 420 mA 5 00 50 0 500 35 00 350 0 3500 26 WATLOW Series 980 985 User s Manual Setup Chapter4 PS Se j Mode Key NOTE l The Upper display will always show the process value after 1 minute without key Control Set Point strokes Figure 29 The Operation Menu Operation Parameters Set Point 2 Sets the operating set point for Output 2 when control mode is Ht eps i Ht or CL CL SP2 only appears when Ot1 and Ot2 are the same and functions as an ON OFF control Proportional Band Set the proportional bandwidth for each Output adjustable from 0 to 999 F or 0 to 555 C for ranges displayed in whole degrees and 0 to rol 99 9 F or 0 to 55 5 C for ranges displayed in 0 1 If set at Pb 0 the Series Pha 9801985 functions as a simple ON OFF control with a 3 F or 1 7 C switching
42. number option Check the unit sticker on the control and compare your model number to those shown here and also the model number breakdown in the back of this manual Series 980 985 internal circuits appear inside the line drawing of the 980 985 while connections and terminal designations appear outside the line drawing All outputs are referenced to a de energized state The final wiring figure is a typical system example All wiring and fusing should conform to the National Electric Code and to any locally applicable codes as well When you apply power without sensor inputs on the terminal strip the Series 980 985 will display in the Upper display and a 0 in the Lower display Press the AUTO MANUAL key twice and an ER 7 is displayed for one second This error indicates an open sensor Remove power to the control and connect the sensor properly see Page 14 Figure 8 115 VAC Power LI Wiring l Jumper 4 to 6 and Jumper 5 to 7 for 115 VAC operation L2 Earth Ground P CAUTION To avoid potential D electric shock use National Electric Code NEC safety practices when wiring and connect ing this unit to a power source and to electrical sensors or peripheral devices Li Figure 9 l l Jumper 5 to 6 for 230 VAC Power 230 VAC operation Wiring Lz Earth Ground Install and Wire Chapter 2 WATLOW Series 980 985 User s Manual 13 Input Options 1 2 amp 3 Thermoco
43. o 17 C Observe the system s approach to set point If the load temperature overshoots set point increase rA1 to 2 00 minutes Then raise set point by 20 to 30 F or 11 to 17 C and watch the approach to the new set point If rA1 is advanced too far approach to the set point will be very sluggish Repeat as necessary until the system rises to the new set point without overshooting or approaching the set point too slowly Calibration Offset Adjustment You may want your system to control to a temperature other than the value coming from the input sensor If so measure the difference between that temperature perhaps at another point in the system and the process value showing in the Upper display Then enter the amount of CAL offset you want Calibration offset adds or sub tracts degrees from the value of the input signal Manual and Automatic Operation To change from manual to auto operation press the AUTO MAN key twice Manual operation provides direct time proportioned power control of the outputs from 100 to 100 A negative output value is allowed only with a Cl Cool selection on either Otl or 0t2 Automatic operation provides closed loop ON OFF or PID control When the operation transfers from a closed loop to an open loop the 985 retains the power level from the closed loop control When returning to the closed loop control the previous set point temperature is restored 30 WATLOW series 980 985 User s Manual Tuning
44. ols and accessories 3 After we receive your return we will examine it to determine the cause for your action 4 In cases of manufacturing defect we will enter a repair order replacement order or issue credit for material 5 Ifthe unit is unrepairable we will return it to you with a letter of explanation Repair costs will not exceed 50 percent of the original cost Watlow Controls Watlow Controls is a division of Watlow Electric Mfg Co St Louis MO a manufacturer of industrial electric heating products since 1922 Watlow begins with a full set of specifications and completes an industrial product that is manufactured totally in house in the U S A Watlow products include electric heaters sensors controls and switching devices The Winona operation has been designing solid state electronic control devices since 1962 and has earned the reputation as an excellent supplier to original equipment manufac turers These OEMs depend upon Watlow Controls to provide compatibly engineered controls which they can incorporate into their products withconfi dence Watlow Controls resides in a 100 000 square foot marketing engineer ing and manufacturing facility in Winona Minnesota Index WATLOW Series 9801985 User s Manual 47
45. om IEEE Inc 345 East 47th Street New York NY 10017 6 WATLOW Series 980 985 Users Manual Install and Wire Chapter 2 Wiring Guide Noise Sources k Switches and relay contacts operating inductive loads suchas motor coils solenoids and relays etc Thyristors or other semiconductor devices which are not zero crossover fired randomly fired or phase angle fired devices All welding machinery Heavy current carrying conductors Fluorescent and neon lights How To Decrease Noise Sensitivity Physical separatlon and wire routing must be given careful consideration in planning the layout of the system For example A C power supply lines should be bundled together and physically kept separate from input signal lines sensor lines A 12inch minimum separatlon is usually effective Keep all switched output signal lines high power level separate from input signal lines sensor lines Cross other wiring at 90 angles whenever crossing lines is unavoidable Another important practice is to look at the system layout and identify electri cal noise sources such as solenoids relay contacts motors etc and where they are physically located Then route the wire bundles and cables as far away as possiblefrom these noisesources Don t mount relays or switching devices close to a microprocessor control Don t have phase angle fired devices in the same electrical enclosure or on the same power line with the control
46. ontrol performance tune the Series 985 to the thermal system The tuning settings here are meant for a broad spectrum of applications your system may have somewhat different requirements 1 Apply power to the Series 965 and enter a set point Begin with these Operation Parameters Pbl 1 rE1 0 00 rA1 0 00 Ct1 5 CAL 0 AUt 0 Proportional Band Adjustment Output 1 Gradually increase Pb1 until the Upper display temperature stabilizes to a constant value The process temperature will not be right on Set point because the initial reset value is 0 00 repeats per minute When PB1 0 rE1 and rA1 are inoperative and the 985 functions as a simple ON OFF control with a 3 F or 1 7 C switching differential Reset Adjustment Gradually increase rE1 until the upper display tem perature begins to oscillate or hunt Then slowly decrease rE1 until the Upper display stabilizes again near set point NOTE This is a slow proce dure taking from minutes to hours to obtain optimum value Cycle Time Adjustment Set Ct1 as required Optimum system control is sometimes achieved with faster cycle times However if a mechanical contactor or solenoid is switching power to the load a longer cycle time may be desirable to minimize wear on the mechanical components Experiment until the cycle time is consistent with the quality of control you want Rate Adjustment Increase rA1 to 1 00 min Then raise set point by 20 to 30 F or 11 t
47. or Install and Wire Chapter 2 WATLOW Series 980 985 Use sManual 21 Keys Displays F NOTE The Upper display will always show the process value after 1 minute without key strokes Figure 25 Series 980 985 Displays Chapter 3 How to Use the Keys and Displays Series 980 985 Displays and Load LED s LOAD 1 m When lit this LED tells you when Upper Display Red 0 3 high LED seven segment three or four digit display indicating either process actual tem perature the operating parameter values or an open sensor Lower Display Red 0 3 high LED seven segment three or four digit display indicating the set point output value prompts for data in the upper display or error and alarm codes LOAD 2 When lit this LED tells you when Output 1 is ener Output 2 is ener gized gized or the alarm is active 22 WATLOW Series 980 985 User s Manual Keys and Displays Chapter 3 Series 980 985 Keys UP DOWN keys When pressed simultaneously for 3 sec onds the Setup Menu appears displaying the LOC parameter From the LOC pa rameter press the UP DOWN keys again and the Calibration Menu appears UP Key Increases the value of the displayed parameter A light touch increases the value by one Holding the key down increases the display value at a rapid rate New data is self entering in 5 seconds DOWN Key Decreases the value of the displayed parameter A l
48. ount of time the output relay is energized depends on the system temperature Triac Solid state switching device Upper display data Displayed information which gives the operator programmer real or actual data i e actual process temperature See Programmed display data Warm Start Start up condition where all program information is remembered by the instrument s memory back up protection Zero switching Action that provides output switching only at the zero voltage crossing points of the AC line WATLOW Series 980 985 User s Manual 45 Index A Appendix 34 AUTO MAN key 23 Automatic Operation 23 31 Auto tuning 30 B Bumpless transfer 31 C Calibration 38 Combination Differential Filter 10 Fig 5 Common Mode Fitter Wiring 10 Fig 4 D DCOutput 1 16 Fig 16 DC Output 2 20 Fig 20 Decrease Noise Sensitivity How To 7 Default Parameters Installation 26 Chart 1 Operation 28 Chart 2 Differential Mode Filter Wiring 10 Fig 3 Dimensions Control 12 Fig 7 Panel Cutout 12 Fig 6 Displays 22 DOWN key 23 E Eliminate Noise How To 8 Entering the Setup Menu 24 Error Codes 32 General Description 4 Glossary 44 Ground Loops 9 H How To Deal with Alarms 31 Deal with Error Codes 32 Eliminate Noise 8 Install And Wire The Series 980 985 Chapter 2 6 Install The Series 980 985 11 Setup The Series 980 985 Chapter 4 24 Tune And Operate Chapter 5 29 Us
49. quip ment and by quali fied personnel Figure 33 Entering the Calibration Menu i NOTE Calibration values are not retained unless you are In the MANUAL mode i NOTE While in the Calibra tlon Menu all outputs are OFF except the 4 20mA output WATLOW Series 9801985 User s Manual 37 T C Calibration Figure 34 The Calibration Menu ri NOTE Before calibration on an installed control make sure all data and parameters are documented See Setup and Operation Charts Pages 26 and 28 J NOTE Not all parameters will appear They are dependent on your unit type Use only the steps that apply to your unit 38 WATLOW Series 9801985 User s Manual Thermocouple low end uncompensated 0 mV Thermocouple high end uncompensated 50mV Thermocouple compensated value reference RTD low end resistance see Tlable 2 on Page 39 RTD high end resistance alee Process input OV Process input 5V Process input 4mA Process input 20mA Process output 4mA Process output 20mA Restore factory calibration values See Page 37 Factory use only Factory use only Thermocouple Field Calibration Procedure Equipment Required Type J Reference Compensator with reference junction at 320F 0 C or Type J Thermocouple Calibrator set at 320F 0 C 1 Precision millivolt source 0 50mV min range 0 01 mV resolution Setup And Calibration 1 Connect the AC line voltage LI to Termin
50. r Platinel2 thermocouple RTD or process input The primary output is Heating or Cooling while the secondary output can be Heat Cool or Alarm With the Series 980 985 you can select either PID or ON OFF for Output 1 or Output 2 You may input a complete set of PID parameters for both outputs and select automatic tuning for Output 1 from the front panel This includes proportional band reset rate and cycle time By setting either output s propor tional band to zero the Series 9801985 becomes a simple ON OFF control with a3 F or 1 7 C switching differential 0 3 F or 0 17 C for 0 1 RTD Operator friendly features include automatic LED indicators to aid in monitoring and set up as well as a calibration offset at the front panel The Watlow Series 980 985 automatically stores all information in a non volatile memory 4 WATLOW Series 980 985 User s Manual Getting Started Chapter 1 Starti ng Out Putting Your Control To Work To put your Series 980 985 to work we suggest the following steps Read the User s Manual Plan your installation and wiring Cut the panel mounting hole and install the control Wire your Series 980 985 to the system Start the system and tune the Series 980 985 Make final adjustments to the control parameters and record the data That s all there is to it a E a Overview of the Series 980 985 Menus Before getting into the details of installing and wiring the Series 980 985 t
51. range is 0 0 0 or 0 00 The default is 0 This parameter only appears if the in parameter is 0 5 or 420 Celsius _ Fahrenheit Selects the units of measure for the control The range of this parameter is C or F The default is F This parameter only appears if the In parameter is J K t n Pt2 rtd or rt d Range Low Selects the low limit of the operating range See the model number and specification information in the Appendix for your range values For units with process input it determines scaling of the remote set point input 0 0VDC and 4mA input are equal to Range Low rL of your input type Set point is linearly scaled between rL and rH See Chart 2 on Page 26 te es Range High Selects the high limit of the operating range See the model number and specification information in the Appendix for your range values For units with process input it determines scaling of the remote set point input The 5 OVDC and 20mA input are equal to the Range High rH of your input type Set point is linearly scaled between rL and rH See Chart 2 on Page 26 Ot Output 1 Selects the output action for the primary output The range of this parameter is Ht Heating or CL Cooling Default is Ht Output 2 Selects the output action for the secondary output The range of this parameter is Ht Heating CL Cooling AL Alarm or no None Default is AL Alarm Type Selects the alarm type when Output 2 has been selected as an AL
52. range of the process signal 24 wattow Series 980 985 User s Manual Chapter 4 How To Setup The Series 9801985 Setting up the Series 980 985 is a simple process First configure the 980 985 s features to your application in the Setup Menu and then enter values in the Operating Menu Both tasks use the MODE key to move through the menus and the UP DOWN keys to select data Entering the Setup Menu The Setup Menu displays the parameters that configure the Series 980 985 s features to your application To enter the Setup Menu press the UP and DOWN keys simultaneously for 3 seconds See Figure 27 The Lower display shows the LOC parameter and the Upper display shows its current level All keys are inactive until you release both keys You can get to the LOC parameter from anywhere Use the MODE key to cycle through the menu use the UP DOWN keys to select Setup data You may not see all the parameters in this menu depend ing on the unit s configuration and model number After stepping through the menu you will return to the control set point parameter under the Operation menu P T Mode Key Prompt appears or not according to control configuration Aa Control Set Point Setup Chapter 4 Setup Parameters Setup At the top of the menu the Series 980 985 displays the user level of operation in the Upper display and the LOC parameter in the Lower display When pressing the MODE key the value of the nex
53. rm High Represents the high process alarm or high deviation alarm Displayed only when Ot2 parameter is AL CAL Calibration Offset The range is 99 F 55 C The default is 0 Calibration Offset adds or subtracts degrees from the input signal Auto Tune The range of this parameter is 0 3 off 0 slow 1 medium 2 and fast 3 A value other than 0 initiates the auto tune Fe Local Remote Selects a local or remote set point for the Series 980 985 Local set point is adjustable directly from the 980 985 while remote can only be changed from an external device The signal must be within O 5V or 4 20mA process input This parameter appears if the LOC parameter 0 1 or 2 Chart 3 and rSP 0 5 or 420 If L r f the remote set point is displayed in place of the Operation Menu internal set point ea T Use this page as a master copy for your Series 980 985 Operation Parameters i Do not enter any values here make photocopies instead Operation Parameters Range Facto Default 0 to 999 F 0 to 555 or 0 to 99 9 F 0 to 55 5 C 0 ON OFF control with 3 F or 1 7 C switching differential 0 3 F or 0 17 C for 0 10 units eee Same as Pol Only appears if 0 F 0 C 3 or 4 digit Hi CL or CL Ht operation 0 00 to 9 99 repeats min 0 00 repeats min 0 00 No Reset Action Same as rE1 Only appears if 0 00 repeats min Ht CL or aan Pea 0 00 No Rate Action al Same as rA1 Only appears 0 00 min if H CL or
54. rocessor based 1 8 DIN Mounting 0 Horizontal 5 Vertical Input 1 Type J thermocouple 3 digit only 2 Typed K T N PT 2 thermocouple RTD 1 420mA 0 5VDC 4 digit 3 Typed K T N PT 2 thermocouple RTD 0 1 4 20mA 0 5VDC 4 digit 1 output Solid state relay Form A 0 5A RC suppression Switched DC open collector non isolated Electromechanical relay Form C 6A Warranted to 100 000 cycles Process 0 10VDC non isolated Process 4 20mA non isolated Process 0 20mA non isolated Process 0 5VDC non isolated Solid state relay Form A 0 5A without contact suppression AIO Tnm 0 Ww 2 output Type None Solid state relay Form A 0 5A RC suppressed Switched DC open collector non isolated Electromechanical relay Form A 6A Warranted to 100 000 cycles Solid state relay Form A 0 5A without contact suppression L Electromechanical relay Form B 6A Warranted to 100 000 cycles XR VOWS Front Panel 00 XX Standard Special label consult Watlow representative 36 WATLOW Series 980 985 User s Manual Appendix Calibration Menu In the Calibration Menu various input signals must be supplied in order for the control to go through its auto calibration The calibration menu can only be entered from the LOC parameter in the Setup menu Press the UP DOWN keys simultaneously for 3 seconds 1 second The CAL parameter appears HATLEN _ d Any inadvertent chang
55. rs are documented See Setup and Operation Charts Pages 26 and 26 Connect the AC line voltage LI L2 and ground to the proper terminals of the 980 985 See Chapter 2 2 Connect the multimeter across the 20K ohm resistor to Terminai 1 and 3 for 0 5VDC or 0 10VDC units on the Series 980 985 terminal strip Use regular 20 24 gauge wire 3 Apply power to the unit and allow it to warm up for 15 minutes After warm up put the unit in the CAL menu Seq Figure 33 on Page 37 Press the MODE key until the 4A0 prompt is displayed IMPORTANT When the MANUAL LED is ON the unit is automatically calibrating Your sequence is VERY important Always move to the next prompt before changing the calibration equipment 4 Press the AUTO MAN key twice to enter the MANUAL mode The unit is calibrating when the MANUAL LED is ON At the 4A0 prompt the multimeter should read approximately 0 000V Allow at least 10 seconds to stabilize Use the UP DOWN keys reverse acting to adjust the reading on the multimeter for 0 0V 0 10V Press the MODE key At the 2A0 prompt the multimeter should read approximately 5 000V for 0 5 volt units or 1 0 000V for 0 10 volt units Allow at least 10 seconds to stabilize Use the UP DOWN keys reverse acting to adjust the reading on the multimeter for 5 0V 0 10V on 0 5V units and 10 0V 0 1 OV on 0 1 OV units Press the AUTO MAN key twice to exit the MANUAL mode This pauses calibration to exit the
56. stributor Electrical Ratings Part Number Common Mode Line Filter 250V 3 Amp 0804 0196 0000 a i Table 1 Differential Mode Line Filter Refer to the Islatrol listing above NoiseSuppresslon Device Ratings Metal Oxide Varistor 150V 80 Joule 0802 0273 0000 MOV 130V 38 Joule 0802 0304 0000 MOV 275V 75 Joule 0802 0266 0000 MOV 275V 140 Joule 0802 0405 0000 Install and Wire Chapter 2 WATLOW Series 980 985 User s Manual 9 Noise Guidelines Line Filtering Configurations For Controls These three diagrams show you filter configurations for removing input power noise Choose the one best suited for your system For very dirty or critical applications use a microcomputer regulated powersupply or Uninterruptable Power Supply U P S Don t fasten common mode line filters or filters with metal cases to metal that is at ground potential This prevents ground loops Figure 3 and maintains filter effectiveness Differential Mode Filter Wiring J 7 2 NOTE Keep filters 12 inches or less from the control Minimize the line distance where nolse can bere introduced to control D M Line Filter Load Line Figure 4 Common Mode Filter Wiring l iP NOTE To prevent ground loops do not fasten common mode line filters or filters with metal cases to metal that is at ground poten tlal Doing so will reduce filter effec tiveness Ground Figure 5 Combination Differential Co
57. t Please be attentive to them Here are explanations A The Caution symbol exclamation point in the wide text column alerts you to a CAUTION a safety or functional hazard which could affect your eguipment or its performance A full explanation is in the narrow column on the outside of the page The Warning symbol lightning bolt in the wide text column alerts you to a WARNING a safety hazard which could affect you and the equipment A full explanation is in the narrow column on the outside of the page Your Feedback Your comments or suggestions on this manual are welcome please send them to Technical Writer Watlow Winona Inc 1241 Bundy Blvd Winona MN 55987 or phone 507 454 5300 The Watlow Series 9801985 User s Manual and integral software are copyrighted by Watlow Winona Inc 1988 with all rights reserved blrO293 How to Use the Manual Chapters page aut amp SOND DD OD 10 13 21 22 22 23 24 24 25 26 27 28 29 29 30 31 31 32 34 34 36 37 38 38 4 42 42 43 43 Item Chapter 1 Starting Out With The Watlow Series 980 985 General Description Putting Your Control To Work Overview of the Series 980 985 Menus Chapter 2 How To Install And Wire The Series 980 985 System Planning Sensor Installation Guidelines Installation Guidelines For Preventing Noise Noise Checking For Ground Loops Noise Suppression Devices Available Line Filtering Configurat
58. t alarm The range of this parameter is Pr Process Alarm or dE Deviation Alarm A process alarm is set at an absolute temperature to prevent over underrange Deviation tracks your process set point The default is Pr This only appears if the Ot2 parameter is AL SetupChapter4 WATLOW Series 980 985 User s Manual 25 Setup Latching Selects whether the output is latching or non latching when Output 2 is an alarm Latching alarms must be cleared before the alarm output will reset Non latching automatically resets the alarm output when the condition clears The range is LAt or nLA default is nLA This only appears if the Ot2 AL ps Silencing Selects alarms silencing alarm inhibit Appears only when ALt dE If LAt press the Auto Man key to reset the alarm output If nLA alarm automatically resets 5 seconds after power is applied rtd RTD Selects the RTD calibration curve JIS 0 003916 PC DIN 0 003850 Snar T Setup Menu Setup Menu Prompts and Use this page as a master copy for configuring your Series 980 elects the low Descriptions limit of the Operating range See the model number and specification informa ete Parameters Parameters factory eui __ Default J K appears as H t n Pt2 rtd rt d 0 5 4 4 Dependent on model number C A 0 0 0 Or 0 00 Dependent on input type C F CorF Will not appear if In 0 5 or 420 wooo f f f R dependent a S E inp seteton dependent selection depe
59. t parameter appears in the Upper display and the parameter itself is in the Lower display Lock Selects the level of operator lock out This parameter s range is from 0 3 The default is 0 The levels of operator lock out are defined as follows z LOC 0 All operating parameters may be viewed or changed Manual operation is permitted LOC 1 The set point and actual are the only visible parameters the set point is adjustable in this level of lock out Manual operation is permitted LOC 2 The set point and actual are the only visible parameters set point is adjustable in this level of lock out Manual operation is not permitted Bumpless transfer is defeated LOC 3 The set point and actual are the only visible parameters the set point is not adjustable in this level of lock out Manual operation is not permitted Bumpless transfer is defeated Input Selects the sensor input type This parameter s range is J K t n Pt2 rtd rt d 0 5 and 420 The default is Type J Only those input types compat ible with your unit appear See the model number information for your type Remote Set Point Enables the Series 980 985 to accept a remote set point signal from another device This parameter only appears on models 98XA 2XXX 0000 or 98XA 3XXX 0000 and if In Thermocouple or RTD input Range OFF 05 420 Default OFF V Decimal Selects the location of the decimal point for ail process related data The
60. the head of the screw facing the back of the control Refer to Figure 8 for screw and bracket placement 6 To attach place the bracket into the slots head of the screw facing the back of the control and push backward securing the brackets to the control case Do the same for the other side of the control 7 Make sure the Series 980 985 case is seated properly Tighten the installa tion screws firmly against the panel to secure the unit in place 8 To remove the unit from its enclosure loosen the captive screw at the bottom of the 980 985 s front panel with a Phillips screwdriver Pull the unit from its case 9 To release the mounting brackets push the brackets forward and pull out to release them from the control case Installand Wire Chapter 2 WATLOW Series 980 985 User s Manual 11 Dimensions Pea ni Thickness 0 50 12 7mm Figure 6 Series 980 985 Panel Cutout Dimensions 3 82 0 03 0 00 92mm 0 8 177 Dit a0 Aen GUE Load Power indicators LOAD 1 LOAD F WAT ILA A MDCOORE am 48 0 mmi l roj Seriy Tol Figure 7 Series 980 985 Dimensions Adpahe danm Panel bisun ng Brecker a ii ie renting Hochst Aldi 1525 mm we 18 lita 12 WATLOW Series 9801985 User s Manual Install and Wire Chapter 2 Power W nng How to Wire the Series 980 985 The Series 980 985 wiring is illustrated by model
61. uple Input Terminals 18 amp 20 Model 98 A 1 _ 0 0000 Figure 10 98 A 2 0 0000 Input Options 1 98_A 3 0 0000 2 amp 3 Thermo couple Wiring Diagram F NOTE You must use an isolated or ungrounded thermocouple if an external 4 20mA output device with a non isolated circuit common is connected to the 4 20mA output Extension wire for thermocouples must be of the same alloy as the thermocouple itself to limit errors These input connections are used in conjunction with your units sensor type Thermocouple and RTD only Input Options 2 amp 3 Process or Remote Set Point Input Terminals 15 17 Figure 11 Input Options 2 amp 3 Process Input Model 98 A 2 0 0000 Wlring Diagram 98 A 3 _0 0000 My NOTE 1 15 0 5VDC 4 20mA INPUT Process When using a4 Jumper Terminal 16 Input 20mA process to Terminal 17 when Voltage Input the input using a 4 20mA 0 5VDC 4 20mA INPUT impedance is input 249 ohms id NOTE When using a process input such as 0 5VDC or 4 20mA the rL and tH settings scale the display to match the measured range of the process signal When using a Q5VDC process input the input impedance is 100K ohms An example of this is A pressure transducer operates over a range of 0 300 PSI delivering a4 20mA output signal for this range By setting rL 0 and rH 300 the Series 980 985 is now displayed as a direct reading of pressure 14 W

Series 985 User`s Manual, Feb 1993

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