Fault number

Fault Code

Fault Description

Possible Causes

Countermeasure

1

E.oc1

Over current protection when acceleration operation

Low grid voltage

Check input power supply

Startup during motor free rotation

Restart after the motor standstill

Rotating inertial of load is too large or shock load is too heavy

Increase the acceleration time and reduce the sudden change of load

Improper setting motor parameters

Set motor parameters properly

Set start−up frequency too high

Decrease start−up frequency

Acceleration time is too short

Prolong acceleration time

Set V/F curve ratio too large

Adjust V/F setting and torque boost

Power level of inverter is small

Replace inverter with proper model

2

E.oc2

Over current protection when deceleration operation

Low grid voltage

Check input power supply

Rotating inertial of load is too large

Choose appropriate dynamic braking unit and braking resistor

Improper setting motor parameters

Set motor parameters properly

Deceleration time is too short

Prolong deceleration time

Power level of inverter is small

Replace inverter with proper model

3

E.oc3

Over current protection when operation with constant speed

Sudden change of load during operation

Decrease load’s abrupt frequency change and amplitude

Improper setting motor parameters

Set motor parameters properly

Power level of inverter is small

Replace inverter with proper model

4

E.oV1

Over voltage protection when acceleration operation

Motor short to ground

Check motor wiring

Abnormal input power supply

Check input power supply

Startup during motor free rotation

Restart after the motor standstill

5

E.oV2

Over voltage protection when deceleration operation

Motor short to ground

Check motor wiring

Rotating inertial of load is too large

Choose appropriate dynamic braking unit and braking resistor

Deceleration time is too short

Prolong deceleration time

6

E.oV3

Over voltage protection when operation with constant speed

Motor short to ground

Check motor wiring

Abnormal input power supply

Check input power supply

Rotating inertial of load is too large

Choose appropriate dynamic braking unit and braking resistor

7

E.PCU

Interference protection

Severely Interfered by exterior signal

Ask professional technicians to maintain

8

E.rEF

Abnormal comparison benchmark

Loose connection of connectors inside the inverter

Ask professional technicians to maintain

Abnormal switching power supply

Seek for technical support

Abnormal signal sampling and comparison circuit

Seek for technical support

9

E.AUt

Auto−tuning failure

Enabled auto−tuning function during motor spining

Perform auto−tuning after the motor stops to rotate

Auto−tuning overtime

Check whether motor wirings are well connected

Length of motor wiring within 100m

Incorrect setting of motor parameters in group P9

Please reset the parameters according to the nameplate parameters on the motor.

10

E.FAL

Module protection

Output over current

Check whether the motor the output connection are short circuited, whether the ground is short circuited and whether the load is too hea

DC terminal overvoltage

Check the mains power supply and whether the large inertia load has no function of quick stop at energy consumption brake.

Loose connection of connectors inside the inverter

Ask professional technicians to maintain

11

E.oH1

Heatsink 1 over temperature protection

Ambient over−temperature

Lower the ambient temperature and strengthen ventilation and heat dissipation.

Blockage of air duct

Clean the dusts, wools and other foreign objects in the air duct.

Fan failure

Check if the fan power cable and fan are normal.

Inverter module failure

Seek for technical support

Temperature detection circuit failure

Seek for technical support

12

E.oH2

Heatsink 2 over temperature protection

Ambient over−temperature

Lower the ambient temperature and strengthen ventilation and heat dissipation.

Blockage of air duct

Clean the dusts, wools and other foreign objects in the air duct.

Fan failure

Check if the fan power cable and fan are normal.

Rectifier module failure

Seek for technical support

Temperature detection circuit failure

Seek for technical support

13

E.oL1

Inverter overload protection

Input power under voltage

Check input power supply

Fast start−up when motor operates with high speed

Start again after the motor stop rotating

Keep overloading for a long period of time

Shorten the overloading time and reduce load

Too short  acceleration or deceleration time

Prolong the acceleration or deceleration time

V/F curve ratio is set too large

Adjust V/F curve setting and torque boost

Power level of inverter is small

Replace to inverter with proper model

14

E.oL2

Motor overload protection

Input power under voltage

Check input power supply

Motor rotation is blocked or load mutation occurs

Prevent the motor rotation from blocking and reduce the load mutation

Common motor maintains running under heavy load for a long period of time

Replace the common motor with variable frequency motor or improve the running frequency

Motor overload protection time is set too small

Increase the motor overload protection time

V/F curve ratio is set too large

Adjust V/F curve setting and torque increment

DC braking current is set too high

Reduce the DC brake current

15

E.oUt

Peripheral protection

External failure terminal enabled

Check the external failure terminal status

Stall over voltage or over current and the time lasts for more than one minute

Check whether the external load is normal

19

E.CUr

Current detection fault

Current detection circuit failure

Seek for technical support

20

E.GdF

Output to ground short circuit

Wrong connection

Correct the connection error as per the user’s manual

Motor failure

Replace the motor after performing ground insulation test

Invert module failure

Seek for technical support

Ground leakage current at the inverter output side is too large

Seek for technical support

21

E.LV1

Abnormal power failure during running

Mains power fluctuation or momentary power failure

Check the local mains power

22

E.ILF

Input power failure

Abnormal connection, missing connection or disconnection at the power terminal of the inverter

Check the power wiring according to the operating procedures

Serious imbalance of input power at three phases

Check the three-phase unbalance of the power supply

Burning of capacitor of the inverter

Seek for technical support

Abnormal snubber circuit

Seek for technical support

23

E.oLF

Abnormal output phase loss

Abnormal connection, missing connection or disconnection at the output side of the inverter

Check the output side of the inverter

Imbalance of output three phases

Check whether motor is kept well

Shut down the power supply to check whether the terminal characteristics both at the output side and DC side of the inverter are consistent

24

E.EEP

EEPROM failure

EEPROM reading and writing failure

Seek for technical support

25

E.dL3

Relay contact failure

Loose connection of connectors inside the inverter

Ask professional technicians to maintain

Abnormal snubber circuit

Seek for technical support

26

E.dL2

Temperature sensor taking sample anomaly

Ambient temperature is too low

Check whether the ambient temperature complies with the requirements

The temperature sampling circuit inside the inverter is faulty

Seek for technical support

27

E.dL1

Encoder cable disconnection

Encoder connection is incorrect

Change the encoder cable connection

Encoder has no signal output

Check whether the encoder and power supply are normal.

Encoder cable disconnection

Reconnect

Abnormal function code setting

Confirm that the relevant function codes of encoder are set properly

28

E.P10

+10V power output abnormal

+10V power overload

Increase +10V power load impedance

Utilize externally independent power supply

+10V and GND is short circuited

Eliminate the short circuit failure

+10V power terminal circuit failure

Seek for technical support

29

E.AIF

Analog input abnormal

Analog input voltage is too large

Check whether the analog input voltage complies with the requirements

Analog input circuit failure

Seek for technical support

Analog input circuit signal interfered

Increase the P6.22～P6.24 AI filtering time

30

E.Ptc

Motor over temperature(PTC)

The motor temperature signal reaches the alarm setting value

Strengthen ventilation and heat dissipation

Thermistor resistance failure

Check the thermistor

The sensor protection threshold of the motor is set improperly

Adjust the sensor protection threshold of the motor

31

E.SE1

Communication abnormal 1

(Operation panel RS485)

The communication of operation panel RS485 is disconnected

Check the connection of the equipment communications

Communication failure of operation panel RS485

Check if the sending and receiving data meets the agreement

The inverter is set to master mode

Set the inverter to slave mode

32

E.SE2

Communication abnormal 2

(Terminal 485)

The communication of terminal RS485 is disconnected

Check the connection of the equipment communications

The baud rate is set improperly

Set compatible baud rate

Communication failure of terminal RS485

Check if the sending and receiving data meets the agreement

The communication of terminal RS485 is time−out

Check if the communication timeout setting is appropriate

Improper setting of failure alarm parameters

Adjust the failure alarm parameter

The inverter is set to master mode

Set the inverter to slave mode

33

E.VEr

Version compatibility abnormal

Incompatible software version of the operation panel

Seek for technical support

34

E.CPy

Copy failure

The data error when upload

Check connection of operation panel

he data error when download

Check connection of operation panel

Parametric copy download without parameter upload

Perform download before uploading the parameters

Software version incompatible

Check if d1.09 is consistent

36

E.dL4

Expansion card connection abnormal

Expansion card disconnection

Ask professional technicians to maintain

Expansion card failure

Seek for technical support

37

E.IoF

Terminal mutual exclusion check

failed

The functions of X1 to X7, AI1, AI2 and DI terminals are set in a repeated manner

Modify the settings of X1 to X7, AI1, AI2 and DI terminals and ensure the setting functions are not repeated (excluding null function)

38

E.oL3

Hardware overload protection

Load failure

Check whether motor is blocked

Replace inverter with proper model

nput failure

Check whether there is phase loss

Output failure

Check whether there are phase loss or short circuit

39

E.tPF

Torque verification

failure

output torque does not reach the

brake open torque

Check the torque verify value if

normal

Check the validation failure

detection time if too short

40

E.bLF

Brake failure

With brake release command but

did not received open feedback

Check the brake for malfunction

41

E.bEF

Brake set failure

With brake engaged command

but did not received a close

feedback

Check the brake for malfunction

42

E.oPF

Overspeed failure

Speed exceed the setting

maximum speed

Check if the given is normal

Check if the parameter settings are too small

Check if the encoder is normal

Check if the inverter is running normally

43

E.PbF

Stall failure

The running speed of the inverter is deviated from the actual speed.

Check if the machine is faulty

44

E.0cF

Zero current failure

Motor output current is less than zero current detection value

Check if the motor cable is connected properly

Check if the setting value is too large

63

−LU−

Power under voltage

The power supply voltage is lower than the minimum operating voltage of the inverter

Check input power supply

Abnormal internal switching power supply

Seek for technical support