INVT GD350 Series Drive

INVT GD350 Series Drive Fault Codes:

Fault Code and MeaningCause and Remedy
OUt1
[1] Inverter unit phase-U protection
Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; Shorted to ground.



Remedy:

  • Increase acceleration time.

  • Replace the power unit.

  • Check drive wires.

  • Check whether there is strong interference surrounding the peripheral equipment.
OUt2
[2] Inverter unit phase-V protection
Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; Shorted to ground.



Remedy:

  • Increase acceleration time.

  • Replace the power unit.

  • Check drive wires.

  • Check whether there is strong interference surrounding the peripheral equipment.
OUt3
[3] Inverter unit phase-W protection
Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; Shorted to ground.



Remedy:

  • Increase acceleration time.

  • Replace the power unit.

  • Check drive wires.

  • Check whether there is strong interference surrounding the peripheral equipment.
OV1
[7] Over-voltage during acceleration
Cause: Deceleration time is too short; Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic braking is not enabled.



Remedy:

  • Check input power.

  • Check whether load deceleration time is too short.

  • Check if the motor starts during rotating.

  • Install dynamic braking units.

  • Check the setup of related function codes.
OV2
[8] Over-voltage during deceleration
Cause: Deceleration time is too short; Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic braking is not enabled.



Remedy:

  • Check input power.

  • Check whether load deceleration time is too short.

  • Install dynamic braking units.

  • Check the setup of related function codes.
OV3
[9] Over-voltage during constant speed running
Cause: Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic braking is not enabled.



Remedy:

  • Check input power.

  • Install dynamic braking units.

  • Check the setup of related function codes.
OC1
[4] Over-current during acceleration
Cause: Acceleration is too fast; Grid voltage is too low; VFD power is too small; Load transient or exception occurred; To-ground short circuit or output phase loss; Strong external interference; Overcurrent stall protection is not enabled.



Remedy:

  • Increase acceleration/deceleration time.

  • Check input power.

  • Select the VFD with larger power.

  • Check if the load is short circuited (to-ground or line-to-line) or if rotation is not smooth.

  • Check the output wiring.

  • Check if there is strong interference.

  • Check the setup of related function codes.
OC2
[5] Over-current during deceleration
Cause: Similar to OC1 (Deceleration too fast; Load transient; Short circuit; etc).



Remedy:

  • Increase deceleration time.

  • Check input power and output wiring.

  • Select VFD with larger power.

  • Check for interference.
OC3
[6] Over-current during constant speed running
Cause: Load transient; Grid voltage low; Short circuit; Interference; VFD power too small.



Remedy:

  • Check input power.

  • Select VFD with larger power.

  • Check if load is short circuited.

  • Check output wiring and interference.
UV
[10] Bus undervoltage fault
Cause: Grid voltage is too low; Overvoltage stall protection is not enabled.



Remedy:

  • Check grid input power.

  • Check the setup of related function codes.
OL1
[11] Motor overload
Cause: Grid voltage is too low; Rated motor current is set improperly; Motor stall or load jumps violently.



Remedy:

  • Check grid voltage.

  • Reset rated motor current.

  • Check the load and adjust torque boost.
OL2
[12] VFD overload
Cause: Acceleration is too fast; The motor in rotating is restarted; Grid voltage is too low; Load is too large; Power is too small.



Remedy:

  • Increase acceleration time.

  • Avoid restart after stop.

  • Check grid voltage.

  • Select the VFD with larger power.

  • Select proper motor.
SPI
[13] Phase loss on input side
Cause: Phase loss or violent fluctuation occurred to R, S and T input.



Remedy:

  • Check the input power.

  • Check installation wiring.
SPO
[14] Phase loss on output side
Cause: Phase loss occurred to U, V, W output (or the three phases of motor is asymmetrical).



Remedy:

  • Check the output wiring.

  • Check the motor and cable.
OH1
[15] Overheat of rectifier module
Cause: Air duct is blocked or fan is damaged; Ambient temperature is too high; Long-time overload running.



Remedy:

  • Ventilate the air duct or replace the fan.

  • Lower the ambient temperature.
OH2
[16] Overheat of inverter module
Cause: Air duct is blocked or fan is damaged; Ambient temperature is too high; Long-time overload running.



Remedy:

  • Ventilate the air duct or replace the fan.

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



Remedy:

  • Check external device input.
CE
[18] Modbus/Modbus TCP communication fault
Cause: Baud rate is set improperly; Communication line fault; Communication address error; Communication suffers from strong interference.



Remedy:

  • Set proper baud rate.

  • Check the wiring of communication interfaces.

  • Set proper communication address.

  • Replace or change the wiring to enhance anti-interference capacity.
ItE
[19] Current detection fault
Cause: Poor contact of the connector of control board; Hall component is damaged; Exception occurred to amplification circuit.



Remedy:

  • Check the connector and re-plug.

  • Replace the hall component.

  • Replace the main control board.
tE
[20] Motor autotuning fault
Cause: Motor capacity does not match VFD (diff > 5 classes); Motor parameter set improperly; Autotuning params deviate sharply; Autotuning timeout.



Remedy:

  • Change the VFD model, or adopt V/F mode for control.

  • Set proper motor type and nameplate parameters.

  • Empty the motor load and carry out autotuning again.

  • Check motor wiring and parameter setup.

  • Check whether upper limit frequency is larger than 2/3 of the rated frequency.
EEP
[21] EEPROM fault
Cause: R/W error occurred to the control parameters; EEPROM is damaged.



Remedy:

  • Press STOP/RST to reset.

  • Replace the main control board.
PIDE
[22] PID feedback offline fault
Cause: PID feedback offline; PID feedback source disappears.



Remedy:

  • Check PID feedback signal wires.

  • Check PID feedback source.
bCE
[23] Braking unit fault
Cause: Braking circuit fault or braking tube is damaged; The resistance of external braking resistor is too small.



Remedy:

  • Check the braking unit, replace with new braking tubes.

  • Increase braking resistance.
END
[24] Running time is up
Cause: The actual running time of the VFD is larger than the set running time.



Remedy:

  • Ask help from the supplier.

  • Adjust the set running time.
OL3
[25] Electronic overload fault
Cause: The VFD releases overload pre-alarm based on the set value.



Remedy:

  • Check the load and overload pre-alarm threshold.
PCE
[26] Keypad communication fault
Cause: Keypad wire poorly contacted or disconnected; Wire too long/strong interference; Circuit fault on keypad or main board.



Remedy:

  • Check the keypad wires to confirm whether fault exists.

  • Check the surroundings to rule out interference source.

  • Replace the hardware and ask for maintenance service.
UPE
[27] Parameter upload error
Cause: Keypad wire poorly contacted or disconnected; Wire too long/strong interference; Circuit fault on keypad or main board.



Remedy:

  • Check the surroundings to rule out interference source.

  • Replace the hardware and ask for maintenance service.
DNE
[28] Parameter download error
Cause: Keypad wire poorly contacted or disconnected; Wire too long/strong interference; Data storage error occurred to the keypad.



Remedy:

  • Check the surroundings to rule out interference source.

  • Replace the hardware and ask for maintenance service.

  • Re-backup keypad data.
ETH1
[32] To-ground short circuit fault 1
Cause: VFD output is short connected to the ground; Current detection circuit is faulty; Actual motor power setup deviates sharply from the VFD power.



Remedy:

  • Check whether motor wiring is proper.

  • Replace the hall component.

  • Replace the main control board.

  • Reset the motor parameters properly.
ETH2
[33] To-ground short circuit fault 1
Cause: VFD output is short connected to ground; Current detection circuit is faulty; Actual motor power setup deviates sharply from the VFD power.



Remedy:

  • Check whether motor wiring is proper.

  • Replace the hall component.

  • Replace the main control board.

  • Reset the motor parameters properly.
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] Maladjustment fault
Cause: Control parameters of synchronous motor set improperly; Parameter gained from autotuning is inaccurate; The VFD is 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 performs underload pre-alarm based on the set value.



Remedy:

  • Check the load and overload pre-alarm threshold.
ENC1o
[37] Encoder offline fault
Cause: Encoder line sequence is wrong, or signal wires are poorly connected.



Remedy:

  • Check the encoder wiring.
ENC1d
[38] Encoder reversal fault
Cause: The encoder speed signal is contrary to the motor running direction.



Remedy:

  • Reset encoder direction.
ENC1Z
[39] Encoder Z pulse offline fault
Cause: Z signal wires are disconnected.



Remedy:

  • Check the wiring of Z signal.
OT
[59] Motor over-temperature
Cause: Motor over-temperature input terminal is valid; Exception occurred to temperature detection; Long-time overload running.



Remedy:

  • Check whether temperature sensor is proper.

  • Check the wiring of motor over-temperature input terminal.

  • Check the motor and perform maintenance on the motor.
STO
[40] Safe torque off
Cause: Safe torque off function is enabled by external forces.



Remedy:

  • (Status Indication)
STL1
[41] Exception occurred to safe circuit of channel H1
Cause: The wiring of STO is improper; Fault occurred to external switch of STO; Hardware fault occurred to safety circuit of channel H1.



Remedy:

  • Check whether terminal wiring of STO is proper and firm enough.

  • Check whether external switch of STO can work properly and restart it.

  • Replace the control board.
STL2
[42] Exception occurred to channel H2 safe circuit
Cause: The wiring of STO is improper; Fault occurred to external switch of STO; Hardware fault occurred to safety circuit of channel H2.



Remedy:

  • Check whether terminal wiring of STO is proper and firm enough.

  • Check whether external switch of STO can work properly and restart it.

  • Replace the control board.
STL3
[43] Exception occurred to channel H1 and channel H2
Cause: Hardware fault occurred to STO circuit.



Remedy:

  • Replace the control board.
CrCE
[44] Safety code FLASH CRC check fault
Cause: Control board is faulty.



Remedy:

  • Replace the control board.
E-Err
[55] Repetitive expansion card type
Cause: The two inserted expansion cards are of the same type.



Remedy:

  • You should not insert two cards with the same type.

  • Check the type of expansion card, and remove one card after power down.
ENCUV
[56] Encoder UVW loss fault
Cause: No electric level variation occurred to UVW signal; Encoder is damaged.



Remedy:

  • Check the wiring of UVW.
F1-Er
[60] Failed to identify the expansion card in card slot 1
Cause: There is data transmission in interfaces of card slot 1, however, it cannot read the card type.



Remedy:

  • Confirm whether the expansion card inserted can be supported.

  • Stabilize the expansion card interfaces after power down.

  • Check whether the insertion port is damaged.
C1-Er
[63] Communication timeout occurred to expansion card in slot 1
Cause: There is no data transmission in interfaces of card slot 1.



Remedy:

  • Confirm whether the expansion card inserted can be supported.

  • Stabilize the expansion card interfaces after power down.

  • Check whether the insertion port is damaged.
E-DP
[29] PROFIBUS card communication timeout fault
Cause: There is no data transmission between the communication card and the host controller (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-NET
[30] Ethernet card communication timeout fault
Cause: There is no data transmission between the communication card and the host controller.



Remedy:

  • Check whether the communication card wiring is loose or dropped.
PoFF
System power failure
Cause: The system is powered off or the bus voltage is too low.



Remedy:

  • Check the grid conditions.