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nx frequency converters

asfiff12

high speed application

NXS

user’s manual

Содержание asfiff12

Страница 1: ...nx frequency converters asfiff12 high speed application NXS user s manual ...

Страница 2: ...or control parameters Control keypad Menu M2 Æ G2 6 13 4 8 Protections Control keypad Menu M2 Æ G2 7 16 4 9 Autorestart parameters Control keypad Menu M2 Æ G2 8 17 4 10 High Speed Special parameters Control keypad Menu M2 Æ G2 9 18 4 11 Field bus parameters Control keypad Menu M2 Æ G2 10 18 4 12 Keypad control Control keypad Menu M3 19 4 13 System menu Control keypad M6 20 4 14 Expander boards Con...

Страница 3: ...2 is based on the Standard Application of the All In One package This application requires licence key if it mend to be used above 1900 Hz When above 1900 Hz is going to be used contact factory and give description about need Note that some situations need NXP drive to be used NXP drive can reach higher frequency than NXS drive ...

Страница 4: ...ed 2 1 2 Fine tuning It is possible to tune the motor controller for smoother run especially in high speed mode and for PMS motors See parameter group 9 And separate parameters 2 1 17 2 1 18 2 4 14 2 4 15 2 4 16 2 6 14 2 1 3 Trial Time It is possible to run the drive over 1900Hz without license key for 2 weeks When these 2 weeks has expired will the drive trip and it is not longer possible to run ...

Страница 5: ...art reverse 10 DIN3 External fault input programmable Contact open no fault Contact closed fault 11 CMA Common for DIN 1 DIN 3 Connect to GND or 24V 12 24V Control voltage output Voltage for switches see 6 13 GND I O ground Ground for reference and controls 14 DIN4 Multi step speed select 1 DIN4 DIN5 Frequency ref 15 DIN5 Multi step speed select 2 Open Closed Open Closed Open Open Closed Closed Re...

Страница 6: ...Ctrl Reference 2 1 13 Fieldbus Ctrl Reference 2 1 14 Preset Speed 1 2 1 15 Preset Speed 2 3 1 Control place Internal frequency reference Start forward programmable Start reverse programmable Programmable Start Stop and reverse logic Start Stop Reverse Internal Start Stop Internal reverse Internal fault reset Fault reset input External fault input programmable Reset button Start Stop buttons Refere...

Страница 7: ...eters and signals as well as statuses and measurements Monitoring values cannot be edited See the procut s User s Manual for more information Code Parameter Unit ID Description V1 1 Output frequency Hz 1 Output frequency to motor V1 2 Frequency reference Hz 25 Frequency reference to motor control V1 3 Motor speed Rpm krpm 2 The unit for motor speed is depending on Frequency Scale P2 1 17 V1 4 Moto...

Страница 8: ...ion G1 21 Fieldbus V1 20 1 Motor Current 1D A 45 Motor current drive independ ent given with one decimal point V1 24 5 Last Active Fault 37 Table 4 3 Fieldbus monitoring values 4 1 3 Application Status Word Application Status Word combains different drive statuses to one data word See monitoring value V1 20 4 Status Word Application Status Word FALSE TRUE b0 b1 Not in Ready state Ready b2 Not Runn...

Страница 9: ... the motor P2 1 8 Nominal speed of the motor rpm krpm 112 The default applies for a 4 pole motor and a nominal size frequency converter The unit for motor speed is depending on Frequency Scale P2 1 17 P2 1 9 Nominal current of the motor 0 1x IH 2 x IH A IH 113 Check the rating plate of the motor 2 1 10 Motor cosϕ 0 30 1 00 0 85 120 Check the rating plate of the motor 2 1 11 I O reference 0 3 0 117...

Страница 10: ... to fieldbus 8 Rvs if P2 2 1 3 P2 2 3 Current reference offset 0 1 1 302 0 0 20mA 1 4 20mA P2 2 4 Reference scaling minimum value P2 2 5 Hz 303 Selects the frequency that corresponds to the min reference signal 0 00 No scaling P2 2 5 Reference scaling maximum value Hz 304 Selects the frequency that corresponds to the max reference signal 0 00 No scaling P2 2 6 Reference inversion 0 1 0 305 0 Not i...

Страница 11: ...warning 6 Ext fault or warning 7 Ref fault or warning 8 Warning 9 Reversed 10 Preset speed 1 11 At speed 12 Mot regulator active 13 OP freq limit 1 superv 14 Control place IO 15 Thermistor fault warng 16 Fieldbus input data P2 3 8 Relay output 1 function 0 16 2 313 As parameter 2 3 7 P2 3 9 Relay output 2 function 0 16 3 314 As parameter 2 3 7 P2 3 10 Output frequency limit 1 supervision 0 2 0 315...

Страница 12: ... 0 0 500 0 Linear 0 S curve ramp time P2 4 2 Ramp 2 shape 0 0 10 0 s 0 0 501 0 Linear 0 S curve ramp time P2 4 3 Acceleration time 2 0 1 3000 0 s 10 0 502 P2 4 4 Deceleration time 2 0 1 3000 0 s 10 0 503 P2 4 5 Brake chopper 0 4 0 504 0 Disabled 1 Used when running 2 External brake chopper 3 Used when stopped running 4 Used when running no testing P2 4 6 Start function 0 1 0 505 0 Ramp 1 Flying st...

Страница 13: ...tomatic torque boost P2 6 3 U f ratio selection 0 3 0 108 0 Linear 1 Squared 2 Programmable 3 Linear with flux optim P2 6 4 Field weakening point Hz 602 P2 6 5 Voltage at field weakening point 10 00 200 00 100 00 603 n x Unmot P2 6 6 U f curve midpoint frequency P2 6 4 Hz 604 P2 6 7 U f curve midpoint voltage 0 00 100 00 100 00 605 n x Unmot Parameter max value P 2 6 5 P2 6 8 Output voltage at zer...

Страница 14: ...at stop 0 32000 ms 100 616 P2 6 15 11 Start up torque 0 3 0 621 0 Not used 1 Torque memory 2 Torque reference 3 Start up torque fwd rev P2 6 15 12 Start up torque FWD 300 0 300 0 s 0 0 633 P2 6 15 13 Start up torque REV 300 0 300 0 s 0 0 634 P2 6 15 15 Encoder filter time 0 1000 ms 0 618 P2 6 15 17 Current control P gain 0 00 100 00 40 00 617 P2 6 15 18 Current control I gain 0 00 100 00 40 00 657...

Страница 15: ...6 3 P2 6 17 10 Flux 100 0 2500 100 136 4 P2 6 17 11 Flux 110 0 2500 110 136 5 P2 6 17 12 Flux 120 0 2500 120 136 6 P2 6 16 13 Flux 130 0 2500 130 136 7 P2 6 17 14 Flux 140 0 2500 140 136 8 P2 6 17 15 Flux 150 0 2500 150 136 9 P2 6 17 16 Rs voltage drop 0 30000 Varies 662 Used for torque calculation in open loop P2 6 17 17 Ir add zero point voltage 0 30000 Varies 664 P2 6 17 18 Ir add generator sca...

Страница 16: ...ctor at zero speed 0 0 150 0 40 0 706 P2 7 11 Motor thermal time constant 1 200 min Varies 707 P2 7 12 Motor duty cycle 0 100 100 708 P2 7 13 Stall protection 0 3 0 709 0 No response 1 Warning 2 Fault stop acc to 2 4 7 3 Fault stop by coasting P2 7 14 Stall current 0 1 InMotor x 2 A IL 710 P2 7 15 Stall time limit 1 00 120 00 s 15 00 711 P2 7 16 Stall frequency limit P2 1 2 Hz 712 P2 7 17 Underloa...

Страница 17: ... 1 Wait time 0 10 10 00 s 0 50 717 P2 8 2 Trial time 0 00 60 00 s 30 00 718 P2 8 3 Start function 0 2 0 719 0 Ramp 1 Flying start 2 According to P 2 4 6 P2 8 4 Number of tries after undervoltage trip 0 10 0 720 P2 8 5 Number of tries after overvoltage trip 0 10 0 721 P2 8 6 Number of tries after overcurrent trip 0 3 0 722 P2 8 7 Number of tries after 4mA reference trip 0 10 0 723 P2 8 8 Number of ...

Страница 18: ...lux Circle Stabilizer Table 1 11 Autorestart parameters G2 8 4 11 Field bus parameters Control keypad Menu M2 Æ G2 10 Code Parameter Min Max Unit Default Cust ID Note P2 10 1 Fieldbus min scale Hz 850 P2 10 2 Fieldbus max scale Hz 851 P2 10 3 Fieldbus process data out 1 selection 0 10000 1 852 Choose monitoring data with parameter ID Def Output Frequency P2 10 4 Fieldbus process data out 2 selecti...

Страница 19: ...e listed below See the Keypad control menu in the Vacon NX User s Manual Code Parameter Min Max Unit Default Cust ID Note P3 1 Control place 1 3 1 125 1 I O terminal 2 Keypad 3 Fieldbus R3 2 Keypad reference P2 1 1 P2 1 2 Hz P3 3 Direction on keypad 0 1 0 123 0 Forward 1 Reverse R3 4 Stop button 0 1 1 114 0 Limited function of Stop button 1 Stop button always enabled Table 4 17 Keypad control para...

Страница 20: ...equency converter such as application and language selection customised parameter sets or information about the hardware and software see the product s User s Manual 4 14 Expander boards Control keypad Menu M7 The M7 menu shows the expander and option boards attached to the control board and board related information For more information see the product s User s Manual ...

Страница 21: ...3 Acceleration time 1 2 1 3 104 Deceleration time 1 2 1 4 These limits correspond to the time required for the output frequency to accelerate from the zero frequency to the set maximum frequency P ID102 105 Preset speed 1 2 1 14 106 Preset speed 2 2 1 15 Parameter values are automatically limited between the minimum and maximum frequencies P ID101 ID102 Note the use of TTF programming method in th...

Страница 22: ...r runs undermagnetised below the field weakening point and produces less torque and electro mechanical noise Squared U f ratio can be used in applications where torque demand of the load is proportional to the square of the speed e g in centrifugal fans and pumps Figure 5 1 Linear and squared change of motor voltage Programmable U f curve 2 The U f curve can be programmed with three different poin...

Страница 23: ...point voltage frequency in parameter group 2 6 so that the motor takes enough current at low frequencies First set ID108 to Programmable U f curve value 2 Increase zero point voltage ID606 to get enough current at zero speed Set then the midpoint voltage ID605 to 1 4142 ID606 and midpoint frequency ID604 to value ID606 100 ID111 NOTE In high torque low speed applications it is likely that the moto...

Страница 24: ... Motor cos phi 2 1 10 Find this value cos phi on the rating plate of the motor 121 Keypad frequency reference selection 2 1 12 Defines which frequency reference source is selected when controlled from the keypad Applic Sel ASFIFF12 0 Analogue volt ref Terminals 2 3 1 Analogue curr ref Terminals 4 5 2 Keypad reference Menu M3 3 Fieldbus reference 4 AI3 Table 5 3 Selections for parameter ID121 FBSpe...

Страница 25: ...change e If Start forward DIN1 and Start reverse DIN2 signals are active simultaneously the Start forward signal DIN1 has priority 1 DIN1 closed contact start open contact stop DIN2 closed contact reverse open contact forward See below Figure 5 4 Start Stop Reverse 2 DIN1 closed contact start open contact stop DIN2 closed contact start enabled open contact start disabled and drive stopped if runni...

Страница 26: ...nable Run Enable False or when the control place is changed The Start Stop contact must be opened before the motor can be started 4 DIN1 closed contact start forward Rising edge required to start DIN2 closed contact start reverse Rising edge required to start 5 DIN1 closed contact start Rising edge required to start open contact stop DIN2 closed contact reverse open contact forward 6 DIN1 closed c...

Страница 27: ...ve control place are used reference according to parameters ID117 ID121 and ID122 Note The value of parameter ID125 Keypad Control Place does not change When DIN3 opens the control place is selected according to parameter 3 1 8 Reverse contact open Forward contact closed Reverse 302 Reference offset for current input 2 2 3 0 No offset 0 20mA 1 Offset 4 mA living zero provides supervision of zero l...

Страница 28: ...iltered signal Unfiltered signal 305 Reference inversion 2 2 6 Inverts reference signal Max ref signal Min set freq Min ref signal Max set freq 0 No inversion 1 Reference inverted Figure 5 7 Reference invert 306 Reference filter time 2 2 7 Filters out disturbances from the incoming analogue Uin signal Long filtering time makes regulation response slower Figure 5 8 Reference filtering ...

Страница 29: ...t filter time 2 3 3 Defines the filtering time of the analogue output signal Setting this parameter value 0 will deactivate filtering Figure 5 9 Analogue output filtering 309 Analogue output inversion 2 3 4 Inverts the analogue output signal Maximum output signal Minimum set value Minimum output signal Maximum set value See parameter ID311 below Figure 5 10 Analogue output invert 310 Analogue outp...

Страница 30: ...fault or warning Fault or warning depending on P ID701 7 4mA reference fault or warning Fault or warning depending on P ID700 if analogue reference is 4 20 mA and signal is 4mA 8 Warning Always if a warning exists 9 Reversed The reverse command has been selected 10 Preset speed 1 Applications 2 10 Jogging speed Applications 3456 The preset speed has been selected with digital input The jogging spe...

Страница 31: ...s ID312 ID314 316 Output frequency limit supervision value 2 3 11 Selects the frequency value supervised by parameter ID315 See Figure 5 12 Figure 5 12 Output frequency supervision 377 AI1 signal selection 2 2 8 Connect the AI1 signal to the analogue input of your choice with this parameter For more information about the TTF programming method 388 AI2 signal selection 2 2 9 Connect the AI2 signal ...

Страница 32: ...r the output frequency to accelerate from the zero frequency to the set maximum frequency ID102 These parameters give the possibility to set two different acceleration deceleration time sets for one application The active set can be selected with the programmable signal DIN3 ID301 504 Brake chopper 2 4 5 0 No brake chopper used 1 Brake chopper in use and tested when running Can be tested also in R...

Страница 33: ... according to the set deceleration parameters If the regenerated energy is high it may be necessary to use an external braking resistor for faster deceleration Normal stop Ramp Run Enable stop coasting 2 After the Stop command the speed of the motor is decelerated according to the set deceleration parameters However when Run Enable is selected the motor coasts to a halt without any control from th...

Страница 34: ...determines the braking time When the frequency is 10 of the nominal the braking time is 10 of the set value of parameter ID508 Figure 5 14 DC braking time when Stop mode Coasting ID506 1 Stop function Ramp After the Stop command the speed of the motor is reduced according to the set deceleration parameters as fast as possible to the speed defined with parameter ID515 where the DC braking starts Th...

Страница 35: ...t frequency at which the DC braking is applied See Figure 5 16 516 DC braking time at start 2 4 11 DC brake is activated when the start command is given This parameter defines the time before the brake is released After the brake is released the output frequency increases according to the set start function by parameter ID505 518 Acceleration deceleration ramp speed scaling ratio between prohibit ...

Страница 36: ...s where additional brake resistors are not needed When braking is needed the frequency is reduced and the flux in the motor is increased which in turn increases the motor s capability to brake Unlike DC braking the motor speed remains controlled during braking The flux braking can be set ON or OFF 0 Flux braking OFF 1 Flux braking ON Note Flux braking converts the energy into heat at the motor and...

Страница 37: ...motor speed very accurately comparing the actual speed received from the tachometer to the speed reference accuracy 0 01 4 Torque crtl closed loop The I O terminal and keypad references are torque references and the frequency converter controls the motor torque 5 Frequency control advanced open loop Frequency control with better performance at lower speeds 6 Speed control advanced open loop Speed ...

Страница 38: ...programmable U f curve has been selected with the parameter ID108 this parameter defines the middle point voltage of the curve See Figure 5 2 606 Output voltage at zero frequency 2 6 8 If the programmable U f curve has been selected with the parameter ID108 this parameter defines the zero frequency voltage of the curve NOTE If the value of parameter ID108 is changed this parameter is set to zero S...

Страница 39: ...hing the zero speed when a stop command is given This parameter has no effect if the selected stop function ID506 is Coasting See chapter 6 1 617 CL Current control P gain 2 6 14 17 Sets the gain for the current controller This controller is active only in closed loop and advanced open loop modes The controller generates the voltage vector reference to the modulator See chapter 6 1 618 CL Encoder ...

Страница 40: ...r 6 2 623 AOL Flux reference 2 6 15 3 Reference for flux below the frequency limit Larger value gives more torque but increases losses See chapter 6 2 625 AOL Zero speed current 2 6 15 1 At very low frequencies this parameter defines the constant current reference to the motor See chapter 6 2 626 CL Acceleration compensation 2 6 14 5 Sets the inertia compensation to improve speed response during a...

Страница 41: ...tifi cation run ID110 Nominal voltage of the motor par 2 1 6 ID111 Nominal frequency of the motor par 2 1 7 ID112 Nominal speed of the motor par 2 1 8 ID113 Nominal current of the motor par 2 1 9 ID120 Motor cos phi par 2 1 10 When in closed loop and with an encoder installed also the parameter for pulses revolutions in Menu M7 has to be set The automatic identification is activated by setting thi...

Страница 42: ...p This parameter defines the motor stator resistance as a voltage drop at the nominal current Parameter value is defined according to motor nominal voltage and the current and the actual stator resistance as s n R U I rop RsVoltageD n 2560 662 Measured voltage drop 2 6 5 18 The measured voltage drop at stator resistance between two phases with the nominal current of the motor This parameter is ide...

Страница 43: ...programmable digital inputs DIN3 The information can also be programmed into digital output DO1 and into relay outputs RO1 and RO2 702 Output phase supervision 2 7 6 0 No response 1 Warning 2 Fault stop mode after fault according to ID506 3 Fault stop mode after fault always by coasting Output phase supervision of the motor ensures that the motor phases have an approximately equal current 703 Eart...

Страница 44: ...e default value Setting this parameter does not affect the maximum output current of the drive which is determined by parameter ID107 alone See chapter 6 3 F i g u r e 5 1 8 M o t or thermal current IT curve 707 Motor thermal protection Time constant 2 7 11 This time can be set between 1 and 200 minutes This is the thermal time constant of the motor The bigger the motor the bigger the time constan...

Страница 45: ... the protection and reset the stall time counter See chapter 6 4 710 Stall current limit 2 7 14 The current can be set to 0 1 InMotor 2 For a stall stage to occur the current must have exceeded this limit See Figure 5 20 The software does not allow entering a greater value than InMotor 2 If parameter ID113 Nominal current of motor is changed this parameter is automatically restored to the default ...

Страница 46: ...state to occur the output frequency must have remained below this limit See chapter 6 4 713 Underload protection 2 7 17 0 No response 1 Warning 2 Fault stop mode after fault according to ID506 3 Fault stop mode after fault always by coasting If tripping is set active the drive will stop and activate the fault stage Deactivating the protection by setting the parameter to 0 will reset the underload ...

Страница 47: ...al up down counter counts the accumulated underload time If the underload counter value goes above this limit the protection will cause a trip according to parameter ID713 If the drive is stopped the underload counter is reset to zero See Figure 5 23 and chapter 6 5 Figure 5 23 Underload time counter function 717 Automatic restart Wait time 2 8 1 Defines the time before the frequency converter tri...

Страница 48: ...restart Start function 2 8 3 The Start function for Automatic restart is selected with this parameter The parameter defines the start mode 0 Start with ramp 1 Flying start 2 Start according to ID505 720 Automatic restart Number of tries after undervoltage fault trip 2 8 4 This parameter determines how many automatic restarts can be made during the trial time set by parameter ID718 after and underv...

Страница 49: ...mber of tries after 4mA reference trip 2 8 7 This parameter determines how many automatics restarts can be made during the trial time set by ID718 0 No automatic restart after 4mA reference fault trip 0 Number of automatic restarts after the analogue current signal 4 20mA has returned to the normal level 4mA 725 Automatic restart Number of tries after external fault trip 2 8 9 This parameter deter...

Страница 50: ...ponse 1 Warning 2 Fault stop mode after fault according to ID506 3 Fault stop mode after fault always by coasting Setting the parameter to 0 will deactivate the protection 733 Response to fieldbus fault 2 7 22 Set here the response mode for the fieldbus fault if a fieldbus board is used For more information see the respective Fieldbus Board Manual See parameter ID732 734 Response to slot fault 2 7...

Страница 51: ...PT100 input 2 3 5 PT100 input 3 Note If the selected value is greater than the actual number of used PT100 inputs the display will read 200ºC If the input is short circuited the displayed value is 30ºC 740 Response to PT100 fault F56 2 7 25 0 No response 1 Warning 2 Fault stop mode after fault according to ID506 3 Fault stop mode after fault always by coasting 741 PT100 warning limit 2 7 26 Set he...

Страница 52: ...eter value from the fieldbus Enter the ID number of the item you wish to monitor for the value of these parameters See chapter 6 6 See monitoring signals for full detail of ID numbers Some typical values 1 Output frequency 15 Digital inputs 1 2 3 statuses 2 Motor speed 16 Digital inputs 4 5 6 statuses 3 Motor current 17 Digital and relay output statuses 4 Motor torque 25 Frequency reference 5 Moto...

Страница 53: ...the speed oscillations which occur especially at light loads by damping the torque oscillations This parameter defines the damping coefficient for the torque stabilizer In general the higher the inertia of the system with respect the motor torque the lower the oscillations are in frequency and the closer the value should be 1000 The torque stabilizer affects directly the output frequency of the dr...

Страница 54: ...se encoder speed for slip compensation B2 Disable encoder supervision B3 Disable slip compensation for reverse direction B4 Increase output frequency range up to 3900Hz B5 Increment 1512 Synchronous Asynchronous Modulation In a synchronous modulation mode the ratio of the switching frequency and the drive output frequency i e the pulse number is an integer 1513 Symmetrical Asymmetrical Modulation ...

Страница 55: ... variable Sel Advanced options 2 B0 Sensor less control 1 B1 1 Master controlled Id control in sync master follower applications 0 independent Id control in master and followers B2 Reserved B3 Reserved B4 PM motor 1 enable start positioning damping B5 Enable 1517 Advanced Options 4 By changing the value of this WORD type variable is it possible to activate different bits of the Advanced Options 4 ...

Страница 56: ...on see the product s User s Manual Pushing the Start button for 3 seconds selects the control keypad as the active control place and copies the Run status information Run Stop direction and reference 123 Keypad Direction 3 3 0 Forward The rotation of the motor is forward when the keypad is the active control place 1 Reverse The rotation of the motor is reversed when the keypad is the active contro...

Страница 57: ...connected to slot C of the control unit Set the encoder P R parameter P7 3 1 1 Run in open loop and check the encoder speed and direction V7 3 2 2 Change the direction parameter P7 3 1 2 or switch the phases of motor cables if necessary Do not run if encoder speed is wrong Program the no load current to parameter ID612 and set parameter ID619 Slip Adjust to get the voltage slightly above the linea...

Страница 58: ...th parameters The thermal current IT specifies the load current above which the motor is overloaded This current limit is a function of the output frequency The thermal stage of the motor can be monitored on the control keypad display See the product s User s Manual CAUTION The calculated model does not protect the motor if the airflow to the motor is reduced by blocked air intake grill 6 4 Parame...

Страница 59: ...ween the zero frequency and the field weakening point The protection is not active below 5Hz the underload time counter is stopped The torque values for setting the underload curve are set in percentage which refers to the nominal torque of the motor The motor s name plate data parameter motor nominal current and the drive s nominal current IH are used to find the scaling ratio for the internal to...

Страница 60: ...he deceleration time longer Use brake chopper or brake resistor available as options Activate over voltage controller Check input voltage 3 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 5 Charging switch The charging switch is open when the START command has been given faulty operation...

Страница 61: ...atsink temperature is under 10 C 14 Frequency con verter over temperature Heatsink temperature is over 90 C Overtemperature warning is issued when the heatsink temperature exceeds 85 C Check the correct amount and flow of cooling air Check the heatsink for dust Check the ambient temperature Make sure that the switching frequency is not too high in relation to ambient tem perature and motor load 15...

Страница 62: ...n Unknown option board or drive Subcode in T 14 S1 Unknown device S2 Power1 not same type as Power2 Contact the distributor near to you 41 IGBT temperature IGBT Inverter Bridge overtemperature protection has detected too high a short term overload current Check loading Check motor size Make Identification run 43 Encoder fault Problem detected in encoder signals Sub code in T 14 1 Encoder 1 channel...

Страница 63: ... Brake Actual status of the brake is opposite than control signal Check mechanical brake condition and connections 59 Follower Communication SystemBus or CAN communication is broken between master and follower Check parameters from expanderboard and optical fibre or CAN cable 60 Cooling Liquid cooled drive cooling circulation have been failed Check reason for cooling failure from external system 6...

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