Fault No. 

Fault display on panel

Fault description

Possible causes

Corrective actions

1

E.oc1

Over current during acceleration

Low grid voltage

Check input power supply

Start when the motor is spinning

Restart after the motor at 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 frequency too high

Decrease start frequency

Acceleration time too short

Prolong acceleration time

V/F curve setting are not correct

Adjust V/F setting and torque boost

Output power is too small

Replace inverter with higher model

2

E.oc2

Over current during deceleration

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

Output power is too small

Replace inverter with higher model

3

E.oc3

Over current at constant speed

Sudden load change of during operation

Decrease load’s abrupt frequency change and amplitude

Improper setting motor parameters

Set motor parameters properly

Output power is too small

Replace inverter with higher model

4

E.oV1

Over voltage during acceleration

Motor short-circuit to ground

Check motor wiring

Abnormal input power supply

Check input power supply

Start when the motor is still rotating

Restart after the motor at standstill

5

E.oV2

Over voltage during deceleration

Motor short-circuit 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 at constant speed

Motor short-circuit 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 level

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

Motor data identification failure

Enabled motor data identification function during motor spinning

Perform motor data identification after the motor at standstill

Motor data identification overtime

Check whether motor wiring are well connected

Length of motor wiring within 100m

Incorrect setting of motor parameters in group P9

Set motor parameters according to the nameplate on the motor

10

E.FAL

Module protection

Output over current

Check whether the motor the output connection are short circuited

Check whether ground is short circuited and whether the load is too heavy

DC BUS over-voltage

Check the mains power supply

Check whether the large inertia load and quickly stop

Check the braking unit and braking resistor is property selected 

Output terminal short circuited to ground

Check the motor wiring

Loose connection of connectors inside the inverter

Ask professional technicians to maintain

11

E.oH1

Heat-sink 1 over temperature protection

Ambient over−temperature

Lower the ambient temperature and strengthen ventilation and heat dissipation.

Blockage of air duct

Clean the dusts, wool and other foreign matters in the air duct.

Fan failure

Check whether fan wiring are well connected

Replace a new fan  

Inverter module failure

Seek for technical support

Temperature detection circuit failure

Seek for technical support

12

E.oH2

Heat-sink 2 over temperature protection

Ambient over−temperature

Lower the ambient temperature and strengthen ventilation and heat dissipation.

Blockage of air duct

Clean the dusts, wool and other foreign objects in the air duct

Fan failure

Check whether fan wiring is well connected.

Replace a new fan of the same model

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

Start when motor is spinning

Start again after the motor at standstill

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 setting are not correct

Adjust V/F curve setting and torque boost

Output power is too small

Replace with higher model

14

E.oL2

Motor overload protection

Input power under voltage

Check input power supply

Motor rotation is blocked or load suddenly changed

Prevent the motor rotation from blocking and reduce the load suddenly changed

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

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

Motor overload protection time is set too small

Increase the motor overload protection time

V/F curve setting are not correct

Adjust V/F curve setting and torque boost

DC braking current is set too high

Reduce the DC braking current

15

E.oUt

Peripheral protection

External terminal fault active

Check the external failure terminal status

Over voltage stall or over current stall 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 short circuited to ground

Wrong connection

Correct the connection error as per the user manual

Motor abnormal

Replace the motor after performing ground insulation test

Invert module fault

Seek for technical support

Ground leakage current at the output side is too large

Seek for technical support

21

E.LV1

Abnormal power off in running status

Mains power fluctuation or momentary power failure

Check the mains power supply

22

E.ILF

Input power fault

Abnormal connection, missing connection or disconnection at the power supply

Check the power connections as per the operational regulations and eliminate the errors of missing connection and disconnection

Serious imbalance of three phases power supply

Check whether the imbalance of three phases power comply with the requirements

Capacitor aging

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

Check the three phase output whether exits missing connection or disconnection

Imbalance of output three phases

Check whether motor is kept well

Switch off the power supply to check whether the terminal characteristics at the output side and DC side are consistent

24

E.EEP

EEPROM failure

EEPROM reading and writing failure

Seek for technical support

25

E.dL3

Pre-charging contactor  contact failure

Loose connection inside the inverter

Ask professional technicians to maintain

Abnormal snubber circuit

Seek for technical support

26

E.dL2

Temperature sensor disconnection

Ambient under temperature

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 parameter setting

Confirm the relevant parameters of encoder are set properly

28

E.P10

+10V power output abnormal

+10V power overload

Increase +10V power load impedance

Use 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 is interfered

Increase the P6.22 - P6.24 AI filter 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 whether the data receiving and transmission complies with the protocol, whether the check sum is correct and whether the receiving and transmission interval complies with the requirements

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

Failure of terminal Communication RS485

Check whether the data receiving and transmission complies with the protocol, whether the check sum is correct and whether the receiving and transmission interval complies with the requirements

The communication of terminal RS485 is time−out

Check whether the communication timeout is set properly and confirm the communication cycle of the application program

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 incompatibility

Incompatible software version of the operation panel

Seek for technical support

34

E.CPy

Copy fault

The data error when uploading

Check connection of operation panel

The data error when downloading

Check connection of operation panel

Operation panel no parameters is uploaded

Upload the parameters to operation panel first

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 a same function

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

Abnormal load

Check whether motor is stalled

Replace inverter with higher model

Abnormal input power supply

Check whether there is phase loss

Output failure

Check whether the output phase loss or short circuit

63

−LU−

Power supply under voltage

The power supply voltage is lower than the minimum operating voltage

Check input power supply

Abnormal internal switching power supply

Seek for technical support