OUt1

Inverter 

unit U 

phase 

protection

The   acceleration is too fast

There is   damage to the internal to IGBT of the phase

lMisoperation   is caused by interference.

The   connection of the driving wires is not good

Short-to-ground   occurs.

Increase the   ACC time

Change   the power unit

Check the   driving wires

Check if   there is strong interference to the external equipment

OUt2

Inverter 

unit V 

phase 

protection

OUt3

Inverter 

unit W 

phase 

protection

OV1

Accelerating overvoltage

The input   voltage is abnormal

There is   large energy feedback

No   braking components

Braking   energy is not open

Check the   input power

Check if   the DEC time of the load is too short or the VFD starts during the rotation   of the motor or it needs to increase the energy consumption components

Install   the dynamic braking components

Check the   setting of related function codes

OV2

Decelerating overvoltage

OV3

Constant overvoltage

OC1

Accelerating overcurrent

The   acceleration or deceleration is too fast

The   voltage of the grid is too low

The power   of the VFD is too low

The load transients   or is abnormal

The   grounding is short circuited or the output is phase loss

There is   strong external interference

The   overvoltage stall protection is not open

Increase   the ACC/DEC time

lCheck the   input power

Select   the VFD with a larger power

Check if   the load is short circuited (the grounding short circuited or the wire short   circuited) or the rotation is not smooth

Check the   output configuration.

Check if   there is strong interference

Check the   setting of related function codes

OC2

Decelerating overcurrent

OC3

Constant overcurrent

UV

Bus 

under-

voltage 

fault

The   voltage of the grid is too low

The   overvoltage stall protection is not open

Check the   input power of the grid

Check the   setting of related function codes

OL1

Motor 

overload

The   voltage of the grid is too low

The rated   current of the motor is not correctly set

The motor   stall or load transients is too strong

Check the   power of the grid

Reset the   rated current of the motor

Check the   load and adjust the torque lift

OL2

VFD 

overload

The acceleration   is too fast

Reset the   rotating motor

The   voltage of the grid is too low.

The load   is too heavy.

The motor   power is too small

Increase   the ACC time

Avoid the   restarting after stopping.

Check the   power of the grid

Select a VFD   with bigger power.

Select a   proper motor.

SPI

Input 

phase 

loss

Phase   loss or fluctuation of input R,S,T

Check   input power

Check   installation distribution

SPO

Output 

phase loss

U,V,W   phase loss input (or serious asymmetrical three phase of the load)

Check the   output distribution

Check the motor and cable

OH1

Rectifier module overheated

Air duct   jam or fan damage

Ambient   temperature is too high.

The time   of overload running is too long.

Dredge   the vent duct or replace the fan

Lower the   ambient temperature

OH2

Inverter module overheated

EF

External 

fault

SI   external fault input terminals action

Check the   external device input

CE

485 

commun-

ication 

fault

The baud   rate setting is incorrect.

Fault   occurs to the communication wiring.

The   communication address is wrong.

There is   strong interference to the communication.

Set   proper baud rate

Check the   communication connection distribution

Set   proper communication address.

Change or   replace the connection distribution or improve the anti-interference   capability.

ItE

Current-

detecting

 fault

The connection   of the control board is not good

Hall components   are broken

The   modifying circuit is abnormal.

Check the   connector and repatch

Change   the Hall

Change   the main control panel

tE

Motor-autotuning fault

The motor   capacity does not comply with the VFD capability

The rated   parameter of the motor does not set correctly.

The   offset between the parameters from autotune and the standard parameter is   huge

Autotune   overtime

Change   the VFD mode

lSet the ratedparameter   according to the motor name plate

Empty the   motor load and reindentify

Check the   motor connection and set the parameter.

Check if   the upper limit frequency is above 2/3 of the rated frequency.

EEP

EEPROM 

operation

 fault

Error of   controlling the write and read of the parameters

Damage to   EEPROM

Press STOP/RST   to reset

Change   the main control panel

PIDE

PID 

feedback

 outline 

fault

PID   feedback offline

PID   feedback source disappear

Check the   PID feedback signal

Check the   PID feedback source

bCE

Braking 

unit fault

Braking   circuit fault or damage to the braking pipes

The external   braking resistor is not sufficient

Check the   braking unit and change new braking pipe

Increase   the braking resistor

END

Running

 time arrival

The   actual running time of the VFD is above the internal setting running time.

Ask for   the supplier and adjust the setting running time.

OL3

Electrical overload

The VFD   will report overload pre-alarm according to the set value.

Check the   load and the overload pre-alarm point.

PCE

Keypad 

commun-

ication 

fault

The   connection of the keypad wires is not good or broken.

The   keypad wire is too long and affected by strong interference.

There is   circuit fault on the communication of the keypad and main board.

Check the   keypad wires and ensure whether there is mistake.

Check the   environment and avoid the interference source.

Change   the hardware and ask for service.

UPE

Parameters uploading fault

The   connection of the keypad wires is not good or broken.

The   keypad wire is too long and affected by strong interference.

There is circuit   fault on the communication of the keypad and main board.

Check the   keypad wires and ensure whether there is mistake.

Change   the hardware and ask for service.

Change   the hardware and ask for service.

DNE

Parameters downloading fault

The   connection of the keypad wires is not good or broken.

The   keypad wire is too long and affected by strong interference.

There is   mistake on the data storage of the keypad.

Check the   keypad wires and ensure whether there is mistake.

Change   the hardware and ask for service.

Repack-up   the data in the keypad.

E-DP

PROFIBUS communication fault

Communication   address is not correct.

Corresponding   resistor is not dialed

The files   of main stop GSD does not set sound

The   peripheral interference is too large.

Check   related setting

Check the   surrounding environment, and eliminate interference effects.

E-NET

Ethernet communication fault

The   Ethernet address is not set right.

The   Ethernet communication is not selected to right.

The peripheral   interference is too large.

Check the   related setting.

Check the   communication method selection.

Check the   surrounding environment, and eliminate interference effects.

E-CAN

CANopen communication fault

The   connection is not sound

Corresponding   resistor is not dialed

The   communication baud rate is not matched

The   peripheral interference is too large.

Check the   connection

Draw out   the correspond resistor

Set the   same baud rate

Check the   surrounding environment, and eliminate interference effects.

ETH1

Grounding shortcut fault 1

The   output of the VFD is short circuited with the ground.

There is   fault in the current detection circuit.

The   actual motor power sharply differs from the VFD power.

Check if   the connection of the motor is normal or not

Change   the hall

Change   the main control panel

Set motor   parameters correctly.

ETH2

Grounding shortcut fault 2

The   output of the VFD is short circuited with the ground.

There is   fault in the current detection circuit.

The   actual motor power sharply differs from the VFD power.

Check if   the connection of the motor is normal or not

Change   the Hall

Change   the main control panel

Set motor   parameters correctly.

dEu

Speed deviation fault

The load   is too heavy or stalled.

Check the   load and ensure it is normal.

Increase   the detection time.

Check   whether the control parameters are normal.

STo

Maladjustment fault

The   control parameters of the synchronous motors not set properly.

The   autoturn parameter is not right.

The VFD   is not connected to the motor.

Check the   load and ensure it is normal.  

Check   whether the control parameter is set properly or not.

Increase   the maladjustment detection time.

LL

Electronic underload fault

The VFD   will report the underload pre-alarm according to the set value.

Check the   load and the underload pre-alarm point.

PoFF

System power failure

The system is powered off or the bus   voltage is too low.

Check the grid conditions.

Failure of communication betweem the keypad   and main control panel

The keypad is not properly connected.

Check the installation environment of the   keypad.