User's Manual
Contents
1. Secret code settings page 14 Unit calilbration state factory setting Save settings and exit from configuration Undo i Undo changes and exit from configuration Configuration parameters Sense Typical sensor sensivity is 2 mV V which you will find in label of sensors Change SET value according to sensivity of sensors Changing this value will have reserved effect on display For example changing default selecetivity 2 mV V to 2 2 mVIV display reading will reduce 10 Measuring range is defined from selectivity as follows Sensor selectivity 2 mV V is multiplied with the bridge voltage If selectivity is 2 mV V and the bridge voltage is 10 V the input measuring range will be 20 mV 2mV V x 10V 20 mV Load Set or Teach Youcan make scaling by two different ways as follows SET selection indicates the weighing value which gives the maximum signal from the bridge Unit uses this value to calculate the maximum mV signal with maximum load on sensor If display value is e g 5 too low you can fix the display by increasing the Load value 5 Teach selection gives possibility to use reference loads for scaling see page 9 Dec Number of decimals in display Select 0 5 with st keys and accept with H key Filter Display filtering Filtering damps restless display by large number values Measuring interval is 0 4 s Value setting between 1 min 0 010 max 1 000 no filter 0 200 normal filtering e g 0 2 1 52. character 03h lt BCC gt Finally the checksum is calculated using XOR opera tion on the byte characters of the actual command including the ETX excluding ADDR byte In the example the ASCII codes have been presented in hexadecimal e g One wants the measurement result from the display unit address 1 An inquiry is sent MEA CH 1 ASCII codes shown for lt BCC gt calculation M EA C H 1 4Dx45x41x20x43x48x20x31x20x3F x03 P lt ETX gt lt BCC gt 6F XOR operation is presended with a character x ASCII code 20h corresponds to space character So the following bytes are sent to 2041 81 4D 45 41 20 43 48 20 31 20 3F 03 6F RETURN MESSAGE The answer from the panelmeter 2041 is obtained in the following format lt ACK gt RETURN MESSAGE lt ETX gt lt BCC gt lt ACK gt The first byte of the answer contains the start of the answer lt ACK gt ASCII code 06h and the answer itself endmark lt ETX gt ASCII 03h and the checksum of the answer which is calculated from all the byte characters of the answer including lt ACK gt and lt ETX gt 2041 counts the checksum in which case the receiver does not need necessarily to care about it e g e g When a measurement result is for example 21 3 it will be obtained from the panelmeter in the following form lt ACK gt 2 1 3 lt ETX gt lt BCC gt Answer 06 32 31 2E 33 03 1B Secret code You can enter secret code by pressing six time keys 1 4 in wishe
3. A Data sheet of each type of meter dictates the possible combinations Recalibration of card is not needed only scaling and other settings must be set by front panel keys memory i al 7 Ti P o A p 3 N 7 m C H 4 Pe a P gt mi A a A o Y y La E E 4 gt m a DI P ES m n Oj Gi E Ad EJ n DI mo A 7 TE Slots A C A B c 7 Power supply 12 32 VDC hl Green connector or 85 240 VAC E ei Y Grey connector Change of meter type Additional slots Power supply Input card is placed always to slot A By changing input card you can get an other type of meter You can change meter with pulse input to meter with current input thermocouple strain gage etc Additional cards provide output 4 20 mA alarms serial interface BCD output etc Meter data sheet dictates possible combinations grey connectors allow line voltage 110 240 VAC relay contacts There are two different mother boards power supply 85 240VAC and 12 32 VDC mother board accepts 24 VAG Connectors are colour coded Nokeval Oy Yrittajakatu 12 37100 NOKIA FINLAND Tel 358 3 342 4800 email support nokeval com Fax 358 3 342 2066 http www nokeval com
4. Light gray 8 3 Polykarbonate Glands PG 11 3 8 2 Lb Removable mounting brackets RT Terminal connections 10V exitation sense input sense Bridge sensor Max 4 x 350 ohm 150 mA L 0 10V Common 3 B c 6 6 5 5 4 4 20mA 4 3 3 2 2 1 1 i Toe aa input An a A Ta Ree RE ETE Tf E nr Card slot B for optional card analog output Exitation voltage from terminals 6 10V and 1 OV Sensor cable protective sheath is connected only in one point into terminal 1 Power 85 240 VAC 7 amp 8 or 12 32 VDC 7 amp 9 Connecting bridge sensor with 4 or 6 wires Bridge sensors exitation voltage is measured directly from sensor poles Processor corrects display value if voltage differs from 10 Volts Selected 6 wire con nection technique enables also use of separate volt age supply which voltage may vary between 7 13 V Unit accepts also 4 wire connection but then the sense wires must be connected to voltage supply terminals short cut 5 6 and 1 2 This 4 wire connec tion can be used if the accuracy demand is unimpor tant or if the sensor lead wire error is corrected by rescaling the display with known error If the sensror is not connected with 6 wires the lead wire resistance will reduce the exitation vol
5. Nokeval No 050307 User s Manual Field display 2800 2041 for strain gauge sensors Index EE RO A 3 Technical specifications eric iaia air 4 DIMENSIONS cicala ia A anna 4 Terminal connections sansene I A RIN RIA 5 Frontpanel and Keys EE EE eni 6 ENN T Contig ration parameters sosie oido eee 8 Output 0 4 20 mA and 0 10 V option 10 OUTPULCONMEGCIOMS sra danita it pipa 10 ET 11069 A 11 Alarm relay connections ensien E AA 11 Serial output RS 485 RS 232 option i 12 Serialoutputconnections nascendo aa a OR AIR ARIA EEA 12 Serial COMMUNICATION asesan eaea a E A AS A R A 13 Serial protocol SCL Lariana 13 SEO 14 Field display 2800 CONSTITUCION Vase ea dedizahli 15 Manufacturer Nokeval 0y Yrittajakatu 12 FIN 37100 NOKIA Tel 358 3 342 4800 Fax 358 3 342 2066 Field display 2800 2041 for strain gauge sensors 6 digit processor based LED display Settings via front panel keys Output 0 4 20 mA 0 10 V Serial output RS 232 or RS 485 2 4 alarm relays Display taring via front panel key Measuring accuracy lt 0 05 of span The versatile display 2041 is designed for strain gauge sensors Strain gauge sensors can be connected with 4 or 6 wires The 6 wire connection removes the lead wire resistance as bridge voltage is measured from the sensor poles and therefore it is recommended for applications requiring very high accuracy The panelmeter provides 10 V excita
6. RS 232 option Meter may be provided with optional serial output and you can read measurements by e g PC Display programming can not be made via serial port Addi tional card provides serial signal RS232 and RS485 only one of those can be selected Serial signal is isolated from both input signal and power supply Meters with RS485 can be max 31 in same loop and longest distance 1000m RS232 en ables only connection of one meter and max distance 10 20 m Main menu gt gt In config state you can first select card type serial mounted to slot B or C and then address and Baud rate baud rates are 300 1200 2400 4800 9600 19200 and addresses 0 127 Program remembers card type mounted if it has been saved by save command when leaving pro gram In case you can not choose serial card slot has automatically recognized card plug and play Serial output RS485 not used Serial output card installed to the Slot B Serial address selection 0 127 Baud rate selection accept and return to main menu Serial output connections FT A B RS 485 NE ala o When using serial signal RS485 last unit must be terminated 110 ohm resistor You can make termination atterminal connectors or connecting jumper Term to ON position Serial output card 2000 RS yo uo S4 o C0 w o CA Term terminated resistor Fs F
7. Setting starts from largest number from left to right You may go to next number by key Number setting A 400 00 AV Numbers 0 9 and decimal Configuration You can enter configuration state by pressing two level with key You may set alarms in configuration seconds A and keys at same time By arrow keys or in display stage Alarm levels can be set in configu A and Y you can move upwards and downwardsin ration state or measuring state You can cancel changes main menu By pressing key you can enter by selecting text UnDo to display and by pressing gt configuration state at wished point From setting key Next page describes in more details configuration state you can skip direct to save state orto previous functions Configuration start Press two second A and keys at same time A Sens F Na Load Save _ _ Description Select sensor selectivity Default 2mV V Select display value with 6 digits for max load of sensors number of decimals are selected separately Select number of decimals 0 no decimals in display Digital filter for input signal damping selectable 0 01 1 0 1 0 no filter i a e g onrange 0 5 0 display should be showed zero set Halt 5 0 Display brightness 1 15 brightest Default 7 Output settings page 10 Alarm 1 settings page 11 Alarm 2 settings 4 relays selectable in menu Serial output settings page 12
8. ail safe RS232 RS485 RS485 other units on bus Last unit on Factory settings bus o o 3 ool s ojlol S Ojo O O OJ C oloj amp ollo amp o0 7a 73 73 3 3 3 Termination 110 ohm on last units Address 1 Address 2 5620 0 E 5620 0 i Address 0 Data acquisition with PC 5620 0 15610 Twisted pair cable Serial communication Baud rate 300 1200 2400 4800 9600 and 19 200 1 Start 8 Data and 1 Stop bit no parity Serial protocol SCL MESSAGES When asking the measurement data from the panelmeter 2041 through the serial port a command sequence which is in accordance with the SCL protocol is used for the inquiry lt ADDR 80h gt COMMAND STRING lt ETX gt lt BCC gt lt ADDR gt The first byte character to be sent contains the ad dress of the destination device and at the same time functions as the start indicator of the command The uppermost bit of this byte is set in other words 80H 128 in decimal is added to the address COMMAND STRING When measurement data is requested the actual command is MEA CH 1 in which 1 means the channel number there is only one channel in the panelmeter 2041 so the number is always 1 lt ETX gt lt ETX gt mean the end mark of the command ASCII
9. d order lines goes forward in display Setting must be repeated in same order before new 9 setting is accepted For example Press one after Alv x p another keys A x gt A A and once more 1 2 3 A A gt A A You may think the keys as numbers from left to right 1 2 3 4 in order to help recording and AAX gt AA remembering In menu position Code press key and move on to selection state Main menu Secret code not used A Ent Co Enter secret code 6 marks Ent Co Enter same secret code again accept and return to main menu Field display 2800 construction The 2800 series field displays are modular and easy to assemble According to customers wishes The basic construction consists of mother board with tree slots A B and C Slot A determines meter type and provides always input signal Slot B and C are inter changeable As factory delivery input signal is always installed into slot A mA output into slot B and alarms into slot C In case of f ex 4 alarms and relay card with 2 change over contact 2 2 relays are used you must place second relay card into slot B If you accept All cards have calibration only closing or opening relay contacts you need only one relay card with 4 relays placed into slot C The slot B is now usable for other optional outputs You can have different types of meters by only changing the input card in slot
10. e below description Output type selection Set display value on min output 0 V OmA or 4mA e g display 0 0 kg 4 mA Set display value on max output 10 V or 20mA e g 2000 0 kg 20 mA Output signal calibration Output card is calibrated in the factory and only scaling of output is needed Output connections Output 0 10V 0 10V Slot B Output 4 20 mA Alarm option Meter may be provided optional alarm relay card 2000 REL2 In REL2 card is two relays with change over contact Both relays can be setting in configura tion state alarm level hysteresis alarm type and Main menu accept and return to main menu relay direction When all alarm settings is done in configuration mode alarm levels can be easily changed with frontpanel keys in normal measuring state See chapter Front panel and keys Alarm not used Alarm level settings Hysteresis settings Alarm type selection LO low level HI High level Alarm reset manual or automatic User manual reset by front panel key x Auto automatic reset On Off controller Alarm relay direction NO or NC Alarm level settings can be changed in normal measuring state ON used OFF not used Alarm relay connections max 260 VAC 2A 2000 REL2 2000 REL3 2000 1 0 Relay 1 Reay Relay 1 Relay 2 cae Relay 2 Relay 3 asi 4 max 260 VAC 2A max 60 V 100 mA Serial output RS 485
11. emperature sensors pulse sensors serial inputs etc The modification does not require any calibration The optional cards are the same for all the instruments in this product family Each panelmeter type has its own datasheet Modular panelmeter 2041 6 digit bright red LED panel meter Options B C Option cards slots B or C Alarm relays B or C Alarms Configuration and 2 to 4 relays Serial communication B or C display scaling via front panel keys 60 000 Output B Outputs 0 4 20 mA 0 10 V gt DAC RS 232 or RS 485 n 10 V I max 150MA Sense mV output Sense 1 4 sensors Input card 2041 Input card A microprocessor bus control panel key reading display control output and alarms Power supply 85 240VAC or 12 32 VDC 24 VAC The panel meter can easily be modified to accept other sensors by only changing the input card A Technical specifcation Sensor strain gauge max 3500hm parallel Sensorconnection 4 or 6 wire connection Bridge connection full bridge or half bridge Bridge supply 10 VDC max 150 mA Measuringrange 25 50 mV Sensitivity settings mV V freely selectable Accuracy lt 0 05 FS Repeatability lt 0 02 of span Temperature drift 0 0028 C Output option Outputs 0 20 mA 4 20 mA and 0 10 VDC Outp
12. especting minimum load ran with 6 digits Showed decimals are only 10 0000 i er borte I for setting Display desimal setting is made in main menu E Accept setting by key Load 2 Set maximum reference load Mittaus Hi gt Accept min load by key Set value respecting maximum load Pea with 6 digits Showed decimals are only 100000 for setting Display desimal setting is made in main menu n J Accept teaching by pressing key Lo Zero shifting factory setting 0 Zero This function is recomended only when taring or teaching functions can not be made You can shift the display to zero or other values by using zero shifting Typical application is level measurement based on buoyancy in whrere max level of tank zero v load and min level of tank max load opposite to normal weighing Output 0 4 20 mA and 0 10 V option The display may be provided with isolated output ranges 0 20 mA 4 20 mA or 0 10 V which are programmable You can mount output card to slot B or C default B Calibration information is saved to card and no cali Main menu OFF Output 0 20 mA 4 20 mA 0 10 V n N Zero F Y Span I Cal gt Current Voltage accept and return to main menu brationis needed in configuration You need not select card in programming because meter recognizes the mounted card Programming select Output selection in main menu and press key Se
13. idge connection Front panel and keys Conf light indicates program stage Alarm lights A1 and A2 With AW keys You can move on or change 5620 0 numbers and values in programming menu Accptance of chosen stage of program Entering Display Tare procedure Press and hold until display shows 0000 approximately for 3 s Press again and display is tared and ready to measure Configuration You can enter configuration stage by pressing two seconds A and keys at same time In program stage f ex scaling of display sensor selection and alarm mode are chosen See closer in chapter programming Setting of alarms By first pressing of key you can see setpoint of alarm one A1 correspondingly by second pressing setpoint of alarm two A2 etc Third pressing returns display to normal stage Alarm indication light blinks showing that alarm has been set if you do not touch keys you come to normal stage automatically When indication light blinks A1 or A2 you can change alarm value by pressing 4 and V key You may have optional alarm relays for each alarm level Alarm mode hysteresis and other settings must be set in configuration menu If you do not touch keys during 8 seconds display returns to normal state automatically and save settings Setting of alarm value Exit by key You can set alarm value by W keys number by number
14. one new value 4 old values or 0 1 1 10 one new 9 old values very steady Halt Display can be set to show zero below Halt value e g the display should be showed zero when weighing value is under 10 set halt value 10 You can use also negative values Bri Display brightness 1 15 brightest Default 7 Output option Output settings See chapter Output Alarm 1 and 2 option Alarm settings See chapter Alarm Serial option Serial output settings See chapter Serial output Code Secret code settings See chapter Secret code Cal For factory settings Undo Save Exit from configuration stage without saving changes Undo or save and exit Save Scaling of display Display can be scaled on two different ways Select LOAD in menu and press key SET Enter display value on max loading signal from bridge Example If sensor gives 2 mV V and supply voltage for sensor is 10 V max signal from bridge is 2 mV V x 10V 20 mV If you like to show 5000 for max input signal 20mV SET value 5000 The display range is now 0 5000 on input 0 20 mV TEACH You can teach scaling of display by using two reference loads Main menu Set Set display value on max input Load H gt Hi Set signal Teach You can teach display using two reference loads Teach H gt Bf Load 1 Set minimum reference load Return by Mittaus Lo gt Accept min load by pressing key key y Set value r
15. tage and display shows too low values How big this error is depends on the current level in wires and on line resistance An example If the line resistance on each sensor is 2 ohms it means that four 350 ohm bridges in parallel causes 87 5 ohm load to 10 V exitation voltage Half bridge connection Model 2041 accepts also half bridge sensor This is an optional function which must be specified when ordering the unit Unit which is ordered for half bridge sensor can be used with full bridge connection by replacing the short cut jumber as drawn below Riviliitin Half bridge Short cut connected Full bridge No short cut default 4 wire connection Sense wire connection N 10V exitation q input NI A O O gt ov input Bridge sensor Sensor current can be calculated as 10V 87 5 ohm 114 2 mA Voltage in bridge poles is then 10V 114 2 mA x 2 ohm 9 776V Sensor message is 2 24 too low compared to 10 000V exitation voltage Bridge exitation voltage is directly comparable to received mV input and vice versa Model 2041 has continuous exitation voltage measurement function and therefore voltage don t have to be exact in bridge poles Half bridge connection in below picture Terminal 3 is not connected Sensor cable protective sheath is connected only in one point into terminal 1 10V exitation sense input Half br
16. tion voltage for sensors max four 350 ohm sensors Options to the 2041 include output 0 4 20 mA 0 10V 2 4 alarms or serial output RS 485 232 Display scaling and taring is easy via front panel keys Scaling can be carried out in two different ways either by applying the mV values of the bridge or using the teaching function The teaching is done by first loading the sensors with the min weight and then with the max weight after which the meter will automatically count the scaling In applications where the sensor loading is not in balance a separate serial connection unit of the sensors 20 SA 4 can be used to prevent the nonlinearity caused by the imbalance There are two power supply alternatives one for line voltage 85 240 VAC and the other 12 32 VDC 24 VAC both Strain gauge sensors with 4 or 6 wire connection Excitation voltage 10V to sensors max 150 mA Power supply 85 240 VAC or 12 32 VDC 24 VAC galvanically isolated from input and output Analog conversion is done by a 16 bit AD converter resolution 1 64000 and the number of measurements is 3 per second Separate passwords can be set for access to the configuration menu and alarms The display can be damped with a digital filter if necessary The number of decimals on the display is selectable Field display 2800 protection rating is IP65 The series 2000 is very flexible and easy to modify by changing input cards for different kinds of sensors such as t
17. ut range scaleable on the whole display range scaling via front panel Accuracy 0 05 of the scaled display range Galvanic isolation Load resistance test voltage 2000 VDC maximum 7000hm Alarms option Relays 2 4 alarm relays max 230 VAC 2A Optional cards 2000 REL2 or 2000 REL3 4 relays 2x 2000 REL2 prevent the use of other options Serial output option Serial output RS 232 and RS 485 Only for measurement reading or setting of alarms 300 1200 2400 4800 9600 or19200 Baud rate General Display range 6 digits bright red LED digit height 20 mm brightness selectable Display scaling on the whole range via front panel Display taring via front panel keys Teachingfunction applying min max weights Configuration via front panel keys Case 130 x 180 x 80 mm Front panel protection IP65 Operatingtemp 0 60 C Terminals detachable max 1 5 mm Power supply 85 240 VAC or 12 32 VDC 24VAC Weight 5009 How to order 2800 2041 OUT REL2 24VDC Type o Output OUT Alarm card REL2 Power supply 85 240VAC or 12 32 VDC 24VAC Optional cards 2 options available at a time Output card 2000 OUT Alarm card 2 relays 2000 REL2 Alarm card 3 relays 2000 REL3 Serialoutput RS 232 485 2000 RS When ordering a field display the 2000 of the cards is left out Case dimensions 180 80 O O Enclosure
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