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98 • vacon

FAULT TRACING

Real time record

If real time is set to run on the frequency converter the data items T1 and T2 will appear as follows:

T.1

Date

yyyy-mm-dd

T.2

Time

hh:mm:ss,

sss

Note: When contacting your Vacon partner because of a fault condition, always write down all texts

and codes on the keypad display before.

11.2 Fault codes
The fault codes, their causes and correcting actions are presented in the table below. The shadowed

faults are A faults only. The items written in white on black background present faults for which you
can program different responses in the application. See parameter group Protections.

Note: When contacting distributor or factory because of a fault condition, always write down all texts
and codes on the keypad display.

Fault

code

Fault

Possible cause

Correcting measures

Overcurrent

Frequency converter has detected too

high a current (>4*I

) in the motor

cable:

sudden heavy load increase
short circuit in motor cables
unsuitable motor

Subcode in T.14:

S1 = Hardware trip
S2 = Current cutter supervision (NXS)

S3 = Current controller supervision

Check loading.

Check motor.
Check cables.

Overvoltage

The DC-link voltage has exceeded the

limits defined in Table 4-5.

too short a deceleration time
high overvoltage spikes in supply

Subcode in T.14:

S1 = Hardware trip
S2 = Overvoltage control supervision

Make the deceleration time longer. Use

brake chopper or brake resistor (avail-
able as options)

Earth fault

Current measurement has detected that
the sum of motor phase current is not

zero.

insulation failure in cables or motor

Check motor cables and motor.

Charging

switch

The charging switch is open, when the

START command has been given.

faulty operation
component failure

Reset the fault and restart.

Should the fault re-occur, contact your
local distributor.

Emergency

stop

Stop signal has been given from the

option board.

Check emergency stop circuit

Saturation trip

Various causes:

defective component
brake resistor short-circuit or
overload

Cannot be reset from the keypad.

Switch off power.
DO NOT RE-CONNECT POWER!

Contact your local distributor.

If this fault appears simultaneously with
Fault 1, check motor cables and motor

Clearwater Tech - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.clrwtr.com - Email: [email protected]

Содержание NXP series

Страница 1: ...nxp c frequency converters user s manual Clearwater Tech Phone 800 894 0412 Fax 208 368 0415 Web www clrwtr com Email info clrwtr com...

Страница 2: ...ways confirm by press ing the Enter button If the Start Up wizard is not active follow the instructions 7a and 7b 7a Select the language of the keypad from the Menu M6 page 6 1 Instructions on using t...

Страница 3: ...OF DELIVERY 4 TECHNICAL DATA 5 MOUNTING 6 CABLING AND CONNECTIONS 7 LOW HARMONIC REGENERATIVE CABINET DRIVE 8 INSTALLATION INSTRUCTIONS 9 CONTROL KEYPAD 10 COMMISSIONING 11 FAULT TRACING Clearwater T...

Страница 4: ...4 TECHNICAL DATA 14 4 1 Power ratings 14 4 1 1 Vacon NXP C Mains voltage 380 500 V 14 4 1 2 Vacon NXC Regenerative low harmonic drives Mains voltage 380 500 V 15 4 1 3 Vacon NXP C 6 Mains voltage 500...

Страница 5: ...Control terminal signals 59 8 3 Connecting power supply and internal control cables 63 8 4 Optic fibre cables signal listing and connections 64 9 CONTROL KEYPAD 65 9 1 Indications on the Keypad displ...

Страница 6: ...mage the components 1 2 Safety instructions 1 The components of the power unit of the frequency converter and all cabinet mounted devices are potentially live when Vacon NX is connected to mains poten...

Страница 7: ...bols For your own safety please pay special attention to the instructions marked with the following symbols Dangerous voltage General warning Hot surface Risk of burn MOTOR RUN CHECK LIST 1 Before sta...

Страница 8: ...on the installation of the drive in a cabinet can be found in manuals NXP Frequency Converters IP00 Module Installation Frames FR10 to FR14 ud00908 as well as Frequency Inverter UD01063 and Active Fro...

Страница 9: ...2250 6 has been designed and manufactured in accordance with the following standards Safety FR9 FR10 FR12 EN60204 1 2009 as relevant FR11 FR13 14 EN61800 5 1 2007 EMC EN61800 3 2004 and conforms to th...

Страница 10: ...d added IP or EMC protection level changed mark the change in the sticker 3 1 Type designation code 3 1 1 NX type designation NXC 0000 A 2 L 0 SSG A1A20000C3 IFD 5 nk3_2 fh11 Product range NXC cabinet...

Страница 11: ...nput Device I group ILS Load switch IFD Fused disconnecting switch With aR Fuses ICO Contactor IFU Fused With aR Fuses ICB Moulded case circuit breaker 3 2 4 Main Circuit M group MDC DC bus bar connec...

Страница 12: ...VAC customer socket With 30mA leak current prot 3 2 9 Door Mounted D group DLV Pilot light Control voltage on 230VAC DLD Pilot light DO1 24VDC DO1 DLF Pilot light FLT 230VAC RO2 DLR Pilot light RUN 23...

Страница 13: ...nals DC voltage must be adjusted to nominal DC voltage level of the unit 1 35 Un AC and supplied at least for 1 hour If DC voltage is not available and the unit has been stored de energized much longe...

Страница 14: ...utside the rated specifications Neither can the manufacturer be held responsible for consequential damages The Manufacturer s time of warranty is 18 months from the delivery or 12 months from the comm...

Страница 15: ...71 NX_0460 5 460 506 385 578 693 250 200 315 250 FR10 606x2275x605 403 NX_0520 5 520 572 460 690 828 250 250 355 315 FR10 606x2275x605 403 NX_0590 5 590 649 520 780 936 315 250 400 355 FR11 806x2275x6...

Страница 16: ...200 FI10 FI10 1006x2275x605 700 NXC0520 5 520 572 460 690 828 250 250 FI10 FI10 1006x2275x605 700 NXC0650 5 650 715 590 885 1062 355 315 2xFI10 FI12 2006x2275x605 1400 NXC0730 5 730 803 650 975 1170...

Страница 17: ...250 300 250 FR10 606x2275x605 371 NX_0385 6 385 424 325 488 585 355 315 400 300 FR10 606x2275x605 371 NX_0416 6 416 416 325 488 585 400 315 450 300 FR10 606x2275x605 403 NX_0460 6 460 506 385 578 693...

Страница 18: ...606x2275x605 371 NXC0385 6 385 424 325 488 585 355 315 FI10 FI10 606x2275x605 371 NXC0416 6 416 416 325 488 585 400 315 FI10 FI10 606x2275x605 403 NXC0460 6 460 506 385 578 693 450 355 2xFI10 FI12 806...

Страница 19: ...30 TN without brake option flux braking Ambient conditions Ambient operating temperature 10 C no frost 40 C Storage temperature 40 C 70 C Relative humidity 0 to 95 RH non condensing non corrosive no...

Страница 20: ...load 10mA Analogue output 0 4 20mA RL max 500 Resolution 10 bit Accuracy 2 Digital outputs Open collector output 50mA 48V Relay outputs 2 programmable change over relay outputs Switching capacity 24V...

Страница 21: ...1 Dimensions mm IP54 W1 H1 D1 W1 H1 D1 0261 0520 5 0125 0416 6 606 2275 605 606 2400 605 0650 0730 5 0460 0590 6 806 2275 605 806 2400 605 0820 1030 5 0650 0820 6 1206 2275 605 1206 2400 605 1150 5 14...

Страница 22: ...s mm IP21 Dimensions mm IP54 W1 H1 D1 W1 H1 D1 0261 0520 5 0125 0416 6 1006 2275 605 1006 2405 605 0590 1030 5 0460 0820 6 2006 2275 605 2006 2405 605 1150 1450 5 0920 1180 6 2206 2275 605 2206 2445 6...

Страница 23: ...Figure 5 2 Lifting the unit Note Location of lifting lugs varies between different frames Recycle the packaging material according to local regulations 5 3 Fixing the unit to the floor or to the wall...

Страница 24: ...e cabinet section fix all sections in the same way Figure 5 3 Fixing the cabinet to the floor and to the wall 5 3 2 Fixing to the floor only Note This option is not available for FR13 and bigger units...

Страница 25: ...nput is always connected to terminal 1 see picture below and should not be changed The output of the choke should be connected to terminal 2 or 3 see picture below according to the table below The ter...

Страница 26: ...of the transformer have to be set according to the mains voltage The tappings of the transformer in 500V drives is by default set to 400V and in 690V drives to 690V unless otherwise ordered Locate the...

Страница 27: ...nt temperature of the converter Figure 5 7 Space to be left free above left and in front of right the cabinet Type Cooling air required m3 h 0261 0300 5 0125 0208 6 1000 0385 0520 5 0261 0416 6 2000 0...

Страница 28: ...0416 6 3100 0590 1030 5 0460 0820 6 6200 1150 1450 5 0920 1180 6 7700 1770 2700 5 1500 2250 6 15400 Table 5 5 Required cooling air for NXC regenerative low harmonic drives Clearwater Tech Phone 800 8...

Страница 29: ...l as with the switching frequency used For dimensioning of cooling or ventilation equipment for electri cal rooms the following generic formula gives a good approximation of the heat losses at nominal...

Страница 30: ...6 2 6 The 12 pulse drives always have a double set of inputs The motor connection is size dependent as described above and in Figure 6 1 M M M ud1011k4 fh11 M M M NFE NFE NFE INU NFE NFE NFE INU INU I...

Страница 31: ...INU AFE Double input Double output FI14 INU AFE M du dt du dt Figure 6 2 Topology of mechanical sizes NXC regenerative low harmonic drives FI9 FI14 Note Some options affect the wiring direction and pr...

Страница 32: ...s disconnected from the input power Figure 6 3 Vacon LCL filter wiring diagram 6 2 1 1 Removing HF capacitors If a mains rectifier of another manufacturer is connected to the same input transformer th...

Страница 33: ...mechanical sizes Fi9 Fi10 and Fi12 LCL filter Figure 6 5 HF capacitors in NXC regenerative low harmonic drive mechanical sizes Fi13 Fi14 LCL filter Remove Remove Remove Remove Remove Remove Remove Rem...

Страница 34: ...d only The minimum motor cable length is 5m If a safe switch between the frequency converter and the motor is used make sure that it is switched on before setting the frequency converter in run state...

Страница 35: ...llelly per block in bigger units each cable requires a separate overload protection Cable type Level L 2nd environment Level T Mains cable 1 1 Motor cable 2 1 2 Control cable 4 4 Table 6 1 Cable types...

Страница 36: ...ble screen Strip 1 Strip 2 Figure 6 7 Routing of power cables 6 and 12 pulse drives bottom cabling frames FR10 FR12 FR10 ILS as example Connect mains cables to terminals L1 L2 and L3 behind the plexig...

Страница 37: ...of power cables bottom cabling frame FR14 PE Connect motor cables to terminals U V and W on converter using cable lugs EMC earthing clamp for motor cable screen Strip 1 Strip 2 Connect mains cables to...

Страница 38: ...he PE bar Figure 6 11 Routing of power cables bottom cabling frame Fi12 ODU optional Connect motor cables to terminals U V and W on converter Connect mains cables to terminals L1 L2 and L3 behind the...

Страница 39: ...through the cabinet bottom as shown in Figure 6 14 To conform to the EMC requirements a particular cable gland shall be used The cable glands are designed to be used together with screened cables when...

Страница 40: ...ce the fastening spring is rather stiff we recommend to use a cone shaped tool to fit the metal sock in the bush ring and then to clamp it with the spring bent into a ring shape Draw the sock over the...

Страница 41: ...40 vacon CABLING AND CONNECTIONS Clearwater Tech Phone 800 894 0412 Fax 208 368 0415 Web www clrwtr com Email info clrwtr com...

Страница 42: ...additionally attenuated by installing a common mode choke on the motor output The simplest way is to use ferrite rings with a diameter large enough to allow the motor phase conductors to be slipped t...

Страница 43: ...les Vacon 6 and 12 pulse frequency converters can optionally be equipped with terminals for DC supply and with an external brake resistor These terminals are marked with B B R and R The DC bus connect...

Страница 44: ...s NH2UD69V700PV 6 pcs 700 Cu 4 3 95 50 Al 4 3 150Al 41Cu Even Even Odd NX0730 5 730 170M5813 6 pcs NH2UD69V700PV 6 pcs 700 Cu 4 3 120 70 Al 4 3 185Al 57Cu Even Even Odd FR12 NX0820 5 820 170M8547 6 pc...

Страница 45: ...1250 1000 Cu 4 3 150 70 Al 4 3 185Al 57Cu Even Even NX0920 5 920 170M8547 6 pcs NH3UD69V1000PV 6 pcs 1250 1000 Cu 4 3 150 70 Al 4 3 240Al 72Cu Even Even NX1030 5 1030 170M8547 6 pcs NH3UD69V1000PV 6...

Страница 46: ...pcs 1250 1000 Cu 4 3 150 70 Al 4 3 240Al 72Cu Even Even NX1030 5 1030 170M8547 6 pcs NH3UD69V1000PV 6 pcs 1250 1000 Cu 4 3 185 95 Al 4 3 300Al 88Cu Even Even Fi13 NX1150 5 1150 No additional drive fu...

Страница 47: ...7 3 pcs NH3UD69V1000PV 3 pcs 1250 Cu 2 3 185 95 Al 2 3 300Al 88 Cu Even Odd Even Odd NX0590 6 590 170M5813 6 pcs NH2UD69V700PV 6 pcs 700 Cu 2 3 240 120 Al 4 3 120Al 41Cu Even Even Odd FR12 NX0650 6 65...

Страница 48: ...6 pcs NH2UD69V700PV 6 pcs 700 Cu 4 3 95 50 Al 4 3 150Al 41Cu Even Even NX0750 6 750 170M5813 6 pcs NH2UD69V700PV 6 pcs 700 Cu 4 3 120 70 Al 4 3 150Al 41Cu Even Even NX0820 6 820 170M5813 6 pcs NH2UD6...

Страница 49: ...n NX0750 6 750 170M5813 6 pcs NH2UD69V700PV 6 pcs 700 Cu 4 3 120 70 Al 4 3 150Al 41Cu Even Even NX0820 6 820 170M5813 6 pcs NH2UD69V700PV 6 pcs 700 Cu 4 3 150 70 Al 4 3 185Al 57Cu Even Even Fi13 NX092...

Страница 50: ...ontrol can be selected with the REM MAN AUTO selector switch S6 The three possible control places ways are MAN Manual operation by the 0 1 Start switch on the cabinet door REM Remote operation with si...

Страница 51: ...nected to the AFE unit and there are no active faults The AFE ready LED works in the same way irrespective of the operation manner place Figure 7 3 AFE Ready indicator The Run command has to be given...

Страница 52: ...s reached a certain level and the AFE READY LED will illuminate The unit will re charge automatically and close the circuit breakers if the main supply voltage has been cut and turned back on e g volt...

Страница 53: ...he push button S6 when the S11 REM MAN AUTO switch is in MAN position Figure 7 6 MCCB Reset push button S11 This will reset the circuit breaker and at the same time in FR9 FR10 or FR12 solution rechar...

Страница 54: ...g parallel lines with other cables If the motor cables run in parallel with other cables note the minimum distances between the motor cables and other cables given in table below The given distances a...

Страница 55: ...power cable to the earth terminals of the frequency converter motor and the supply centre 7 IMPORTANT If an output filter ODU ODC or OSI is used note that the switching frequency of the converter para...

Страница 56: ...Disconnect the brake resistor cable from terminals R and R of the frequency converter and from the brake resistor Measure the insulation resistance of the cable between each conductor as well as betwe...

Страница 57: ...l descriptions The I O boards mounted at the factory are indicated in the type code For more information on the option boards see Vacon NX option board manual ud741 The control board can be powered ex...

Страница 58: ...1 2 2 RO2 3 ac dc 21 22 23 24 25 26 NX6_6 fh8 21 22 23 25 26 RO1 1 1 2 RO1 3 2 1 RO2 2 ac dc 28 29 TI1 TI1 t Switching 8A 24Vdc 0 4A 125Vdc 2kVA 250Vac Continuously 2Arms Basic relay board OPT A2 Swi...

Страница 59: ...arriers The control connections are isolated from the mains potential and the GND terminals are permanently connected to ground See Figure 8 6 The digital inputs are galvanically isolated from the I O...

Страница 60: ...p for the control unit and fieldbus 7 GND I O ground Ground for reference and controls 8 DIN1 Digital input 1 Ri min 5k 18 30V 1 9 DIN2 Digital input 2 10 DIN3 Digital input 3 11 CMA Digital input com...

Страница 61: ...stor input 29 TI1 Table 8 5 Control I O terminal signals on basic relay board OPT A3 8 2 2 1 Digital input signal inversions The active signal level depends on which potential the common inputs CMA an...

Страница 62: ...he jumpers on the OPT A1 board The positions of the jumpers determine the signal type of analogue and digital inputs On the A1 basic board there are four jumper blocks X1 X2 X3 and X6 each containing...

Страница 63: ...put 10 10V Jumper block X2 AI2 mode AI2 mode 0 20mA Current input AI2 mode Voltage input 0 10V AI2 mode Voltage input 0 10V differential AI2 mode Voltage input 10 10V Jumper block X3 CM A and CMB grou...

Страница 64: ...ed on the cable shield at both cable ends Connect each cable to the connectors marked with the same number on the ASIC board and on the rear side of the control unit Additionally you may have to conne...

Страница 65: ...SIC to control board Terminals on ASIC board of power module 2 H8 Trip signal from power module 1 H7 VaconBus data from ASIC 1 to control board H6 VaconBus data from control board to ASIC 1 H5 ADC syn...

Страница 66: ...potential 9 1 Indications on the Keypad display Figure 9 1 Vacon control keypad and drive status indications 9 1 1 Drive status indications The drive status indications tell the user what the status o...

Страница 67: ...READY is lit up Illuminates when the drive is running Blinks when the STOP button has been pushed and the drive is ramping down Blinks when unsafe operating conditions were encountered due to which t...

Страница 68: ...2 fault history reset 2 3 seconds Browser button up Browse the main menu and the pages of different submenus Edit values Browser button down Browse the main menu and the pages of different submenus Ed...

Страница 69: ...e entered from the main menu using the Menu buttons When there still are pages to enter under the currently displayed menu or page you can see an arrow in the lower right corner of the display and by...

Страница 70: ...5 READY I Oterm 13 95 Hz READY Loc al P1 P3 READY I Oterm STOP READY I Oterm STOP enter enter F0 STOP FAULT I Oterm Parameters Basic parameters Min Frequency 11 Output phase Operation days 17 Fault hi...

Страница 71: ...or current V1 5 Motor torque Calculated motor shaft torque V1 6 Motor power Calculated motor shaft power V1 7 Motor voltage V Calculated motor voltage V1 8 DC link voltage V Measured DC link voltage V...

Страница 72: ...right once again Now you will be able to edit the value digit by digit This editing manner may come in handy when a relatively greater or smaller value than that on the display is desired Confirm the...

Страница 73: ...ad P1 P18 READY Keypad 13 95 Hz READY Keypad G1 G8 Keypad READY Keypad 13 95 Hz enter READY Keypad 14 45 Hz Parameters Basic parameters Min Frequency Input signals Min Frequency Min Frequency Clearwat...

Страница 74: ...ent places sources which the frequency converter can be controlled from For each control place a different symbol will appear on the alphanumeric display Control place Symbol I O terminals Keypad pane...

Страница 75: ...the STOP button will stop the motor only when the keypad has been selected as the active control place Note Additional information on controlling the motor with the keypad is given in Chapters 9 2 1 a...

Страница 76: ...mory of active faults can store the maximum of 10 faults in the order of appearance The display can be cleared with the Reset button and the read out will return to the same state it was before the fa...

Страница 77: ...is displayed By pushing the Menu button right here you will enter the Fault time data record menu indicated by T 1 T 13 In this menu some selected important data valid at the time of the fault are re...

Страница 78: ...der of appearance The number of faults currently in the fault history is shown on the value line of the main page H1 H The order of the faults is indicated by the location indication in the upper left...

Страница 79: ...Pump and Fan Control Appl S6 3 Copy parameters S6 3 1 Parameter sets Store set 1 Load set 1 Store set 2 Load set 2 Load factory defaults S6 3 2 Load up to keypad All parameters S6 3 3 Load down from k...

Страница 80: ...ter S6 8 3 Software info S6 8 3 1 Software package S6 8 3 2 System software version S6 8 3 3 Firmware interface S6 8 3 4 System load S6 8 4 Applications S6 8 4 Name of application D6 8 4 1 Application...

Страница 81: ...on page S6 2 This is done by pushing the Menu button right when on the first page of the System menu Change then the application by pushing the Menu button right once again The name of the application...

Страница 82: ...6 3 1 The Vacon NX frequency converter features a possibility for the user to load back the factory default parameter values and to store and load two customised parameter sets all parameters included...

Страница 83: ...drive provided that the drive is in STOP status Enter the From keypad page S6 3 3 from the Parameter copy menu Push the Menu button right to enter the edit mode Use the Browser buttons to select eithe...

Страница 84: ...lications are changed If you want to transfer the parameters from one application to another you have to upload them first to the keypad 9 3 6 4 Parameter comparison In the Parameter comparison submen...

Страница 85: ...its Then push the Menu button left and you can set the tens etc Finally confirm the password setting with the Enter button After this you have to wait until the Timeout time P6 6 3 see page 87 has exp...

Страница 86: ...s as well as for a set of application dependent parameters Always accept the value with the Enter button scroll options or change values with the Browser buttons up and down arrows Set the Start up Wi...

Страница 87: ...w has expired or as the power is switched on to the keypad If the Default Page value is 0 the function is not activated i e the last displayed page remains on the keypad display Press the Menu button...

Страница 88: ...3 6 7 Hardware settings NOTE The Hardware settings submenu is protected with a password see chapter Password S6 5 1 Store the password in a safe place In the Hardware settings submenu S6 7 under the S...

Страница 89: ...blink Use the Browser buttons to change the fan mode Accept the change with the Enter button or return to the previous level with the Menu button left Figure 9 22 Fan control function HMI acknowledge...

Страница 90: ...blink Use the Browser buttons to change the amount of retries Accept the change with the Enter button or return to the previous level with the Menu button left See Figure 9 23 for the procedure of ch...

Страница 91: ...e counter Example When you want to reset the operation counters you should do the following Figure 9 24 Counter reset Software S6 8 3 The Software information page includes information on the followin...

Страница 92: ...t 6 8 5 1 Nominal power of the unit 6 8 5 2 Nominal voltage of the unit 6 8 5 3 Brake chopper 6 8 5 4 Brake resistor Table 9 10 Hardware information pages Expander boards S6 8 6 In the Expander boards...

Страница 93: ...enu S6 8 7 This menu is meant for advanced users and application designers Contact factory for any assistance needed E1 E5 READY I Oterm A NXOPTA1 I Oterm READY B NXOPTA2 I Oterm E1 E2 I Oterm READY I...

Страница 94: ...gure 9 27 Expander board parameters Code Parameter Min Max Default Cust Selections P7 1 1 1 AI1 mode 1 5 3 1 0 20 mA 2 4 20 mA 3 0 10 V 4 2 10 V 5 10 10 V P7 1 1 2 AI2 mode 1 5 1 See P7 1 1 1 P7 1 1 3...

Страница 95: ...doing any work on Vacon NX connections Do not even open the cabinet door or cover before this time has expired 6 Before connecting the frequency converter to mains make sure that the Vacon NX front co...

Страница 96: ...pad as advised in Chapter 9 3 3 1 b Push the Start button on the keypad start c Move over to the Keypad control menu M3 and Keypad Reference submenu Chapter 9 3 3 2 and change the frequency reference...

Страница 97: ...t was run without the motor being connected a Before running the tests make sure that this can be done safely b Inform your co workers of the tests c Repeat test 8A or 8B Clearwater Tech Phone 800 894...

Страница 98: ...e fault table below A1 Application generated fault See table below or application specific documentation T 15 Module code Indicates where the fault was detected Power Power unit of the converter sizes...

Страница 99: ...pervision NXS S3 Current controller supervision Check loading Check motor Check cables 2 Overvoltage The DC link voltage has exceeded the limits defined in Table 4 5 too short a deceleration time high...

Страница 100: ...supply voltage fuses and cable 11 Output phase supervision Current measurement has detected that there is no current in one motor phase Check motor cable and motor 12 Brake chopper supervision no brak...

Страница 101: ...load current Check loading Check motor size 32 Fan cooling Cooling fan of the frequency converter does not start when ON command is given Contact your local distributor 34 CAN bus communication Sent m...

Страница 102: ...ccurred in the application program Contact your distributor If you are application programmer check the application program 50 Analogue input Iin 4mA sel signal range 4 to 20 mA Current at the analogu...

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