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Fault list and diagnosis
Date: 2015-03-24
Browse the number: 41
Fault No.Fault codeFault descriptionPotential causesSolutions
    Operation panel no display after power onR\S\T terminal without input terminal Use a multimeter to check input power whether the normal
Operation panel abnormal connect with control boardCheck the connecting line between operation panel and control board
Operation panel extension line abnormalReplace operation panel extension line
Inverter 75kW and below power class without short circuited with copper bus
Inverter 90kW and above power class without connecting DC reactor
Inverter 75kW and below power class should short circuited with copper bus between +1 and +2 terminal, Inverter 90kW and above power class should connecting DC reactor between +1 and +2 terminal
Flat cable of control board poor contactFlat cable between control board and function board should be sonnected reliable.
  8.8.8.8 Operation panel display 8.8.8.8Operation panel abnormal connect with control boardCheck the connecting line between operation panel and control board
Operation panel extension line abnormalReplace operation panel extension line
Operation panel extension line wiring is incorrectPlease check the wiring is correct
Handshaking failed between inverter and host computerPlease check the communication protocol
1 E.oc1 Over current protection when acceleration operationLow grid voltageCheck input power supply
Startup too fast during motor rotatingRestart after the motor stops rotating
Rotating inertial of load is too large and shock load is very heavyIncrease the acceleration timeand reduce the occurrences ofsudden change of load
Improper setting of motorparametersSet motor parameters properly
Set start-up frequency toohighDecrease start-up frequency
Acceleration time is tooshortLengthen acceleration time
V/F curve ratio too large Adjust V/F curve setting andtorque boost
Power class of inverter issmallReplace with inverter withproper model
2 E.oc2 Over currentprotection whendecelerationoperationLow grid voltageCheck input power supply
Rotating inertial of load istoo largeChoose appropriate energybraking components
Improper setting of motorparametersSet motor parameters properly
Deceleration time is tooshortLengthen deceleration time
Power level of inverter issmallReplace to inverter with propermodel
3 E.oc3 Over currentprotection whenoperation withconstant speedSudden change of loadduring operationDecrease load’s abruptfrequency change andamplitude
Improper setting of motorparametersSet motor parameters properly
Power level of inverter issmallReplace to inverter with propermodel
4 E.oV1 Over voltageprotection whenaccelerationoperationMotor short to groundCheck motor wiring
Abnormal input powersupply voltageCheck input power supply
Fast start-up again whenmotor operates with highspeedStart again after the motor stoprotating
5 E.oV2 Over voltageprotection whendecelerationoperationMotor short to groundCheck motor wiring
Rotating inertial of load istoo largeChoose appropriate energy braking components
Deceleration time is tooshortLengthen deceleration time
6 E.oV3 Over voltageprotection whenoperation withconstant speedMotor short to groundCheck motor wiring
Abnormal input power supplyCheck input power supply
Rotating inertial of load istoo largeChoose appropriate energybraking components
7 E.PCU InterferenceprotectionSeverely Interfered byexterior signalAsk professional technicians tomaintain
8 E.rEF AbnormalcomparisonbenchmarkLoose connection ofconnectors inside theinverterSeek for technical support
Abnormal internalswitching power supplySeek for technical support
Abnormal signal samplingand comparison circuitSeek for technical support
9 E.AUt Auto-tuning faultEnable auto-tuningfunction during motorspiningPerform auto-tuning after themotor stops to rotate
Auto-tuning overtimeCheck whether motor wiringsare well connected
Length of motor wiring within 100m
Incorrect setting of motorparameters in group P9 Please reset the parametersaccording to the nameplateparameters on the motor
10 E.FAL Module protectionOutput over currentCheck whether the motor theoutput connection are shortcircuited, whether the ground isshort circuited and whether theload is too heavy
DC terminal overvoltageCheck the mains power supplyand whether the large inertiaload has no function of quickstop at energy consumptionbrake.
Loose connection ofconnectors inside theinverterAsk professional technicians tomaintain
11 E.oH1 Heatsink 1 overtemperatureprotectionAmbientover-temperatureLower the ambient temperatureand strengthen ventilation andradiation
Blockage of air ductClean the dusts, wools andother foreign objects in the airduct
Fan failureCheck whether fan wirings arewell connected.
Replace a new fan of the samemodel.
Inverter module failureSeek for technical support
Temperature detectioncircuit failureSeek for technical support
12 E.oH2 Heatsink 2 overtemperatureprotectionAmbient over-temperatureLower the ambient temperatureand strengthen ventilation andradiation
Blockage of air ductClean the dusts, wools andother foreign objects in the airduct
Fan failureCheck whether fan wirings arewell connected.
Replace a new fan of the samemodel
Rectifier module failureSeek for technical support
Temperature detectioncircuit failureSeek for technical support
13 E.oL1 Inverter overloadprotectionInput power under voltageCheck input power supply
Fast start-up when motoroperates with high speedStart again after the motor stoprotating
Keep overloading for along period of timeShorten the overloading timeand reduce load
Acceleration anddeceleration time is tooshortProlong theacceleration/deceleration time
V/F curve ratio is set toolarge Adjust V/F curve setting andtorque boost
Power level of inverter issmallReplace to inverter with propermodel
14 E.oL2 Motor overloadprotectionInput power under voltageCheck input power supply
Motor rotation is blocked orload mutation occursPrevent the motor rotation fromblocking and reduce the loadmutation
Common motor maintainsrunning under heavy loadfor a long period of timeReplace the common motorwith variable frequency motoror improve the runningfrequency
Motor overload protectiontime is set too smallIncrease the motor overloadprotection time
V/F curve ratio is set toolarge Adjust V/F curve setting andtorque increment
DC braking current is settoo highReduce the DC brake current
15 E.oUt Peripheral protectionExternal failure terminalenableCheck the external failureterminal status
The speed incorrect because over current when accelerationCheck whether the externalload is normal
The speed incorrect because over current when decelerationCheck whether the externalload is normal
Over voltage protrection because the speed incorrectCheck whether the externalload is normal
The speed incorrect because over current or over voltage, and last more than 1 minute.Check whether the externalload is normal
19 E.CUr Current detectionabnormalCurrent detection circuitfailureSeek for technical support
20 E.GdF Output to groundshort circuitWrong connectionCorrect the connection error asper the user’s manual
Motor abnormalReplace the motor afterperforming ground insulationtest
Invert module failureSeek for technical support
Ground leakage current atthe output side of theinverter is too highSeek for technical support
21 E.LV1 Abnormal powerfailure during runningMains power fluctuation ormomentary power failureCheck the local mains power
22 E.ILF Input power failureThere is abnormalconnection, missingconnection ordisconnection at the powerterminal of the inverterCheck the power connectionsas per the operationalregulations and eliminate theerrors of missing connectionand disconnection
Serious unbalance of three phases inputpowerCheck whether the unbalance ofthree phasescomply with the requirements
Burning of capacitor of theinverterSeek for technical support
The power-on buffer circuitof the inverter is faultySeek for technical support
23 E.oLF Abnormal outputphaseThere is abnormalconnection, missingconnection ordisconnection at the outputside of the inverterCheck the power connectionsat the output side of theinverter as per the operationalregulations and eliminate theerrors of missing connectionand disconnection
Unbalance of output threephasesCheck whether motor is kept well
Shut down the power supply tocheck whether the terminalcharacteristics both at theoutput side and DC side of theinverter are consistent
24 E.EEP EEPROM failure EEPROM reading andwriting failure Seek for technical support
25 E.dL3 Relay contact failureLoose connection ofconnectors inside theinverterAsk professional technicians to maintain
The power-on buffer circuitis faultySeek for technical support
26 E.dL2 TemperaturesamplingdisconnectionAmbient undertemperatureCheck whether the ambienttemperature complies with the requirements
The temperature samplingcircuit inside the inverter isfaultySeek for technical support
27 E.dL1 Encoder cabledisconnectionEncoder connection isincorrectChange the encoder cableconnection
Encoder has no signaloutputCheck whether the encoderand power supply are normal
Encoder cabledisconnectionReconnect
Abnormal function codesettingConfirm that the relevantfunction codes of the encoderare set properly
28 E.P10 +10V power outputabnormal +10V power overload Increase +10V power loadimpedance
Utilize externally independentpower supply
+10V power supply andGND is short circuited Eliminate the short circuitfailure
+10V power terminalcircuit failure Seek for technical support
29 E.AIF Analog input abnormalAnalog input voltage is toohighCheck whether the analoginput voltage complies with therequirements
Analog input circuit failureSeek for technical support
Analog input circuit signalinterferedIncrease the P6.22~P6.24 AIfiltering time
30 E.Ptc Motor over temperature(PTC)The motor temperaturesignal reaches the alarmsetting valueStrengthen ventilation andradiation
Thermistor resistance failureCheck the thermistor
The sensor protectionthreshold of the motor isset improperlyAdjust the sensor protectionthreshold of the motor
31 E.SE1 Communicationabnormal 1(Operation panel485)The communication ofoperation panel 485 isdisconnectedCheck the connection of theequipment communications
The communication ofoperation panel 485 isfaultyCheck whether the datareceiving and transmissioncomplies with the protocol,whether the check sum iscorrect and whether thereceiving and transmissioninterval complies with therequirements
The inverter is set tomaster modeSet the inverter to slave mode
32 E.SE2 Communicationabnormal 2(Terminal 485)The communication ofterminal 485 isdisconnectedCheck the connection of theequipment communications
The baud rate is setimproperlySet compatible baud rate
The communication ofterminal 485 is faultyCheck whether the datareceiving and transmissioncomplies with the protocol,whether the check sum iscorrect and whether thereceiving and transmissioninterval complies with therequirements
The communication ofterminal 485 is time-outCheck whether thecommunication timeout is setproperly and confirm thecommunication cycle of theapplication program
The failure alarmparameter is setimproperlyAdjust the failure alarmparameter
The inverter is set tomaster modeSet the inverter to slave mode
33 E.VEr Version compatibilityabnormalThe software version of theoperation panel isincompatibleSeek for technical support
34 E.CPy Copy failureThe data error appearswhen copying the inverterparameters to theoperation panelCheck the connections of the operation panel
The data error appearswhen copying theparameters from theoperation panel to theinverterCheck the connections of theoperation panel
The parameters aredirectly downloadedwithout undergoing copyand upload operationsPerform download beforeuploading the parameters
Control board softwareversion incompatibleCheck if d1.09 is consistent
36 E.dL4 Expansion card connection abnormalExpansion card connectionis loosenedAsk professional technicians to maintain
Expansion card failureSeek for technical support
37 E.IoF Terminal mutualexclusion checkfailedThe functions of X1 to X7,AI1, AI2 and DI terminalsare set in a repeatedmanner Modify the settings of X1 to X7,AI1, AI2 and DI terminals andensure the setting functionsare not repeated (excludingnull function)
38 E.oL3 Hardware overload protectionLoad failureCheck whether motor isblocked
Replace inverter with propermodel
Input failureCheck whether there is phaseloss
Output failureCheck whether there arephase loss or short circuit
63 −LU− Power under voltageThe power voltage is lowerthan the minimumoperating voltage of theequipmentCheck input power supply
Input power terminal is not connected tightlyTightening the input power terminals
Use the multimeter to measure the input power and DC bus voltage
If startup LU failure appeared Please check the grid capacity
Flat cable of control board poor contactPlease check the flat cable connecting
Abnormal internalswitching power supplySeek for technical support
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