INVT GD20-UL Series Drive

INVT GD20-UL Series Drive Fault Codes:

Fault Code and MeaningCause and Remedy
OUt1
[1] Inverter unit U phase protection
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.



Remedy:

  • Increase ACC time.

  • Change the power unit.

  • Check the driving wires.

  • Inspect external equipment and eliminate interference.
OUt2
[2] Inverter unit V phase protection
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.



Remedy:

  • Increase ACC time.

  • Change the power unit.

  • Check the driving wires.

  • Inspect external equipment and eliminate interference.
OUt3
[3] Inverter unit W phase protection
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.



Remedy:

  • Increase ACC time.

  • Change the power unit.

  • Check the driving wires.

  • Inspect external equipment and eliminate interference.
OC1
[4] Overcurrent during acceleration
Cause:
The acceleration is too fast; Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference; Overvoltage stall protection not open.



Remedy:

  • Increase the ACC time.

  • Check the input power.

  • Select VFD with larger power.

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

  • Check output configuration.

  • Check if there is strong interference.

  • Check the setting of relative function codes.
OC2
[5] Overcurrent during deceleration
Cause:
The deceleration is too fast; Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference; Overvoltage stall protection not open.



Remedy:

  • Increase the deceleration time.

  • Check the input power.

  • Select VFD with larger power.

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

  • Check output configuration.

  • Check if there is strong interference.

  • Check the setting of relative function codes.
OC3
[6] Overcurrent during constant speed running
Cause:
Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference.



Remedy:

  • Check the input power.

  • Select VFD with larger power.

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

  • Check output configuration.

  • Check if there is strong interference.
OV1
[7] Overvoltage during acceleration
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.



Remedy:

  • Check the input power.

  • Check if DEC time is too short.

  • Check if VFD starts during motor rotation.

  • Increase energy consumption components.

  • Install braking components.

  • Check the setting of relative function codes.
OV2
[8] Overvoltage during deceleration
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.



Remedy:

  • Check the input power.

  • Check if DEC time is too short.

  • Check if VFD starts during motor rotation.

  • Increase energy consumption components.

  • Install braking components.

  • Check the setting of relative function codes.
OV3
[9] Overvoltage during constant speed running
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.



Remedy:

  • Check the input power.

  • Install braking components.

  • Check the setting of relative function codes.
UV
[10] Bus undervoltage
Cause:
The voltage of the power supply is too low; The overvoltage stall protection is not open.



Remedy:

  • Check the input power of the supply line.

  • Check the setting of relative function codes.
OL1
[11] Motor overload
Cause:
Power supply voltage too low; Motor rated current setting incorrect; Motor stall or load transients too strong.



Remedy:

  • Check the power of the supply line.

  • Reset the rated current of the motor.

  • Check the load and adjust the torque lift.
OL2
[12] VFD overload
Cause:
Acceleration too fast; Resetting rotating motor; Power supply voltage too low; Load too heavy; Close loop vector control reverse direction/long low-speed operation.



Remedy:

  • Increase the ACC time.

  • Avoid restarting after stopping.

  • Check the power of the supply line.

  • Select a VFD with bigger power.

  • Select a proper motor.
SPI
[13] Phase loss on input side
Cause:
Phase loss or fluctuation of input R,S,T.



Remedy:

  • Check input power.

  • Check installation distribution.
SPO
[14] Phase loss on output side
Cause:
U,V,W phase loss input (or serious asymmetrical three phase of the load).



Remedy:

  • Check the output distribution.

  • Check the motor and cable.
OH1
[15] Rectifier module overheat
Cause:
Air duct jam or fan damage; Ambient temperature is too high; The time of overload running is too long.



Remedy:

  • Dredge the vent duct or replace the fan.

  • Lower the ambient temperature.
OH2
[16] Inverter module overheat
Cause:
Air duct jam or fan damage; Ambient temperature is too high; The time of overload running is too long.



Remedy:

  • Dredge the vent duct or replace the fan.

  • Lower the ambient temperature.
EF
[17] External fault
Cause:
SI external fault input terminals action.



Remedy:

  • Check the external device input.
CE
[18] 485 communication fault
Cause:
Baud rate setting incorrect; Fault in communication wiring; Communication address wrong; Strong interference.



Remedy:

  • Set proper baud rate.

  • Check the communication connection distribution.

  • Set proper communication address.

  • Change or replace the connection distribution or improve anti-interference capability.
ItE
[19] Current detection fault
Cause:
Control panel connector poor contact; Exception on the magnifying circuit.



Remedy:

  • Check the connector and re-plug.

  • Change the main control panel.
tE
[20] Motor autotuning fault
Cause:
Motor capacity not compatible with VFD; Rated parameter of motor not set correctly; Offset parameters huge; Autotune overtime.



Remedy:

  • Change the VFD mode.

  • Set the rated parameter according to the motor name plate.

  • Empty the motor load.

  • Check the motor connection.

  • Check if the upper limit frequency is above 2/3 of rated frequency.
EEP
[21] EEPROM operation fault
Cause:
Error of controlling the write and read of parameters; Damage to EEPROM.



Remedy:

  • Press STOP/RST to reset.

  • Change the main control panel.
PIDE
[22] PID feedback offline fault
Cause:
PID feedback offline; PID feedback source disappear.



Remedy:

  • Check the PID feedback signal.

  • Check the PID feedback source.
bCE
[23] Braking unit fault
Cause:
Braking circuit fault or damage to braking pipes; External braking resistor not sufficient.



Remedy:

  • Check the braking unit and change new braking pipe.

  • Increase the braking resistor.
END
[24] Running time reached
Cause:
The actual running time of the VFD is above the internal setting running time.



Remedy:

  • Ask for the supplier and adjust the setting running time.
OL3
[25] Electronic overload
Cause:
The VFD will report overload pre-alarm according to the set value.



Remedy:

  • Check the load and the overload pre-alarm point.
PCE
[26] Keypad communication error
Cause:
Keypad not in good connection or offline; Keypad cable too long or strong interference; Keypad/Main board circuit fault.



Remedy:

  • Check the keypad cable and ensure it is normal.

  • Check the environment and eliminate the interference source.

  • Change hardware and ask for maintenance service.
UPE
[27] Parameter upload error
Cause:
Keypad not in good connection or offline; Keypad cable too long or strong interference; Communication circuit fault.



Remedy:

  • Check the environment and eliminate the interference source.

  • Change hardware and ask for maintenance service.
DNE
[28] Parameter download error
Cause:
Keypad not in good connection or offline; Keypad cable too long/interference; Data storage error in keypad.



Remedy:

  • Check the environment and eliminate the interference source.

  • Change hardware and ask for maintenance service.

  • Backup data in the keypad again.
ETH1
[32] To-ground short-circuit fault 1
Cause:
Output of VFD is short circuited with ground; Fault in current detection circuit; Great difference between motor power setting and VFD power.



Remedy:

  • Check if the connection of the motor is normal or not.

  • Change the hall.

  • Change the main control panel.

  • Reset the correct motor parameter.
ETH2
[33] To-ground short-circuit fault 2
Cause:
Output of VFD is short circuited with ground; Fault in current detection circuit; Great difference between motor power setting and VFD power.



Remedy:

  • Check if the connection of the motor is normal or not.

  • Change the hall.

  • Change the main control panel.

  • Reset the correct motor parameter.
dEu
[34] Speed deviation fault
Cause:
Load is too heavy, or stall occurred.



Remedy:

  • Check the load to ensure it is proper, increase the detection time.

  • Check whether control parameters are set properly.
STo
[35] Mal-adjustment fault
Cause:
Control parameters of synchronous motor are set improperly; Autotuning parameter inaccurate; VFD not connected to motor.



Remedy:

  • Check the load to ensure it is proper.

  • Check whether control parameters are set correctly.

  • Increase maladjustment detection time.
LL
[36] Electronic underload fault
Cause:
The VFD will report the underload pre-alarm according to the set value.



Remedy:

  • Check the load and the underload pre-alarm point.
PoFF
System power off
Cause:
System power off or low DC voltage.



Remedy:

  • Check the grid.