| Fault No. | Fault code | Fault description | Potential causes | Solutions |
| | | Operation panel no display after power on | R\S\T terminal without input terminal | Use a multimeter to check input power whether the normal |
| Operation panel abnormal connect with control board | Check the connecting line between operation panel and control board |
| Operation panel extension line abnormal | Replace 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 contact | Flat cable between control board and function board should be sonnected reliable. |
| | 8.8.8.8 | Operation panel display 8.8.8.8 | Operation panel abnormal connect with control board | Check the connecting line between operation panel and control board |
| Operation panel extension line abnormal | Replace operation panel extension line |
| Operation panel extension line wiring is incorrect | Please check the wiring is correct |
| Handshaking failed between inverter and host computer | Please check the communication protocol |
| 1 | E.oc1 | Over current protection when acceleration operation | Low grid voltage | Check input power supply |
| Startup too fast during motor rotating | Restart after the motor stops rotating |
| Rotating inertial of load is too large and shock load is very heavy | Increase the acceleration timeand reduce the occurrences ofsudden change of load |
| Improper setting of motorparameters | Set motor parameters properly |
| Set start-up frequency toohigh | Decrease start-up frequency |
| Acceleration time is tooshort | Lengthen acceleration time |
| V/F curve ratio too large | Adjust V/F curve setting andtorque boost |
| Power class of inverter issmall | Replace with inverter withproper model |
| 2 | E.oc2 | Over currentprotection whendecelerationoperation | Low grid voltage | Check input power supply |
| Rotating inertial of load istoo large | Choose appropriate energybraking components |
| Improper setting of motorparameters | Set motor parameters properly |
| Deceleration time is tooshort | Lengthen deceleration time |
| Power level of inverter issmall | Replace to inverter with propermodel |
| 3 | E.oc3 | Over currentprotection whenoperation withconstant speed | Sudden change of loadduring operation | Decrease load’s abruptfrequency change andamplitude |
| Improper setting of motorparameters | Set motor parameters properly |
| Power level of inverter issmall | Replace to inverter with propermodel |
| 4 | E.oV1 | Over voltageprotection whenaccelerationoperation | Motor short to ground | Check motor wiring |
| Abnormal input powersupply voltage | Check input power supply |
| Fast start-up again whenmotor operates with highspeed | Start again after the motor stoprotating |
| 5 | E.oV2 | Over voltageprotection whendecelerationoperation | Motor short to ground | Check motor wiring |
| Rotating inertial of load istoo large | Choose appropriate energy braking components |
| Deceleration time is tooshort | Lengthen deceleration time |
| 6 | E.oV3 | Over voltageprotection whenoperation withconstant speed | Motor short to ground | Check motor wiring |
| Abnormal input power supply | Check input power supply |
| Rotating inertial of load istoo large | Choose appropriate energybraking components |
| 7 | E.PCU | Interferenceprotection | Severely Interfered byexterior signal | Ask professional technicians tomaintain |
| 8 | E.rEF | Abnormalcomparisonbenchmark | Loose connection ofconnectors inside theinverter | Seek for technical support |
| Abnormal internalswitching power supply | Seek for technical support |
| Abnormal signal samplingand comparison circuit | Seek for technical support |
| 9 | E.AUt | Auto-tuning fault | Enable auto-tuningfunction during motorspining | Perform auto-tuning after themotor stops to rotate |
| Auto-tuning overtime | Check 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 protection | Output over current | Check whether the motor theoutput connection are shortcircuited, whether the ground isshort circuited and whether theload is too heavy |
| DC terminal overvoltage | Check the mains power supplyand whether the large inertiaload has no function of quickstop at energy consumptionbrake. |
| Loose connection ofconnectors inside theinverter | Ask professional technicians tomaintain |
| 11 | E.oH1 | Heatsink 1 overtemperatureprotection | Ambientover-temperature | Lower the ambient temperatureand strengthen ventilation andradiation |
| Blockage of air duct | Clean the dusts, wools andother foreign objects in the airduct |
| Fan failure | Check whether fan wirings arewell connected.
Replace a new fan of the samemodel. |
| Inverter module failure | Seek for technical support |
| Temperature detectioncircuit failure | Seek for technical support |
| 12 | E.oH2 | Heatsink 2 overtemperatureprotection | Ambient over-temperature | Lower the ambient temperatureand strengthen ventilation andradiation |
| Blockage of air duct | Clean the dusts, wools andother foreign objects in the airduct |
| Fan failure | Check whether fan wirings arewell connected.
Replace a new fan of the samemodel |
| Rectifier module failure | Seek for technical support |
| Temperature detectioncircuit failure | Seek for technical support |
| 13 | E.oL1 | Inverter overloadprotection | Input power under voltage | Check input power supply |
| Fast start-up when motoroperates with high speed | Start again after the motor stoprotating |
| Keep overloading for along period of time | Shorten the overloading timeand reduce load |
| Acceleration anddeceleration time is tooshort | Prolong theacceleration/deceleration time |
| V/F curve ratio is set toolarge | Adjust V/F curve setting andtorque boost |
| Power level of inverter issmall | Replace to inverter with propermodel |
| 14 | E.oL2 | Motor overloadprotection | Input power under voltage | Check input power supply |
| Motor rotation is blocked orload mutation occurs | Prevent the motor rotation fromblocking and reduce the loadmutation |
| Common motor maintainsrunning under heavy loadfor a long period of time | Replace the common motorwith variable frequency motoror improve the runningfrequency |
| Motor overload protectiontime is set too small | Increase the motor overloadprotection time |
| V/F curve ratio is set toolarge | Adjust V/F curve setting andtorque increment |
| DC braking current is settoo high | Reduce the DC brake current |
| 15 | E.oUt | Peripheral protection | External failure terminalenable | Check the external failureterminal status |
| The speed incorrect because over current when acceleration | Check whether the externalload is normal |
| The speed incorrect because over current when deceleration | Check whether the externalload is normal |
| Over voltage protrection because the speed incorrect | Check 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 detectionabnormal | Current detection circuitfailure | Seek for technical support |
| 20 | E.GdF | Output to groundshort circuit | Wrong connection | Correct the connection error asper the user’s manual |
| Motor abnormal | Replace the motor afterperforming ground insulationtest |
| Invert module failure | Seek for technical support |
| Ground leakage current atthe output side of theinverter is too high | Seek for technical support |
| 21 | E.LV1 | Abnormal powerfailure during running | Mains power fluctuation ormomentary power failure | Check the local mains power |
| 22 | E.ILF | Input power failure | There is abnormalconnection, missingconnection ordisconnection at the powerterminal of the inverter | Check the power connectionsas per the operationalregulations and eliminate theerrors of missing connectionand disconnection |
| Serious unbalance of three phases inputpower | Check whether the unbalance ofthree phasescomply with the requirements |
| Burning of capacitor of theinverter | Seek for technical support |
| The power-on buffer circuitof the inverter is faulty | Seek for technical support |
| 23 | E.oLF | Abnormal outputphase | There is abnormalconnection, missingconnection ordisconnection at the outputside of the inverter | Check the power connectionsat the output side of theinverter as per the operationalregulations and eliminate theerrors of missing connectionand disconnection |
| Unbalance of output threephases | Check 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 failure | Loose connection ofconnectors inside theinverter | Ask professional technicians to maintain |
| The power-on buffer circuitis faulty | Seek for technical support |
| 26 | E.dL2 | Temperaturesamplingdisconnection | Ambient undertemperature | Check whether the ambienttemperature complies with the requirements |
| The temperature samplingcircuit inside the inverter isfaulty | Seek for technical support |
| 27 | E.dL1 | Encoder cabledisconnection | Encoder connection isincorrect | Change the encoder cableconnection |
| Encoder has no signaloutput | Check whether the encoderand power supply are normal |
| Encoder cabledisconnection | Reconnect |
| Abnormal function codesetting | Confirm 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 abnormal | Analog input voltage is toohigh | Check whether the analoginput voltage complies with therequirements |
| Analog input circuit failure | Seek for technical support |
| Analog input circuit signalinterfered | Increase the P6.22～P6.24 AIfiltering time |
| 30 | E.Ptc | Motor over temperature（PTC） | The motor temperaturesignal reaches the alarmsetting value | Strengthen ventilation andradiation |
| Thermistor resistance failure | Check the thermistor |
| The sensor protectionthreshold of the motor isset improperly | Adjust the sensor protectionthreshold of the motor |
| 31 | E.SE1 | Communicationabnormal 1(Operation panel485) | The communication ofoperation panel 485 isdisconnected | Check the connection of theequipment communications |
| The communication ofoperation panel 485 isfaulty | Check 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 mode | Set the inverter to slave mode |
| 32 | E.SE2 | Communicationabnormal 2(Terminal 485) | The communication ofterminal 485 isdisconnected | Check the connection of theequipment communications |
| The baud rate is setimproperly | Set compatible baud rate |
| The communication ofterminal 485 is faulty | Check 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-out | Check whether thecommunication timeout is setproperly and confirm thecommunication cycle of theapplication program |
| The failure alarmparameter is setimproperly | Adjust the failure alarmparameter |
| The inverter is set tomaster mode | Set the inverter to slave mode |
| 33 | E.VEr | Version compatibilityabnormal | The software version of theoperation panel isincompatible | Seek for technical support |
| 34 | E.CPy | Copy failure | The data error appearswhen copying the inverterparameters to theoperation panel | Check the connections of the operation panel |
| The data error appearswhen copying theparameters from theoperation panel to theinverter | Check the connections of theoperation panel |
| The parameters aredirectly downloadedwithout undergoing copyand upload operations | Perform download beforeuploading the parameters |
| Control board softwareversion incompatible | Check if d1.09 is consistent |
| 36 | E.dL4 | Expansion card connection abnormal | Expansion card connectionis loosened | Ask professional technicians to maintain |
| Expansion card failure | Seek for technical support |
| 37 | E.IoF | Terminal mutualexclusion checkfailed | The 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 protection | Load failure | Check whether motor isblocked
Replace inverter with propermodel |
| Input failure | Check whether there is phaseloss |
| Output failure | Check whether there arephase loss or short circuit |
| 63 | −LU− | Power under voltage | The power voltage is lowerthan the minimumoperating voltage of theequipment | Check input power supply |
| Input power terminal is not connected tightly | Tightening 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 contact | Please check the flat cable connecting |
| Abnormal internalswitching power supply | Seek for technical support |