INVT GD350-19 Series Drive

INVT GD350-19 Series Drive Fault Codes:

Fault Code and MeaningCause and Remedy
OUt1
Inverter unit Phase-U protection
Cause: Acceleration is too fast.



Remedy:

  • Increase acceleration time.
OUt2
Inverter unit Phase-V protection
Cause:
IGBT module is damaged; Misacts caused by interference; drive wires are poorly connected; To-ground short circuit occurs.



Remedy:

  • Replace the power unit.

  • Check drive wires.

  • Check whether there is strong interference surrounding the peripheral equipment.
OUt3
Inverter unit Phase-W protection
Cause:
IGBT module is damaged; Misacts caused by interference; drive wires are poorly connected; To-ground short circuit occurs.



Remedy:

  • Replace the power unit.

  • Check drive wires.

  • Check whether there is strong interference surrounding the peripheral equipment.
OV1
Over-voltage during acceleration
Cause:
Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake 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
Over-voltage during deceleration
Cause:
Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake 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
Over-voltage during constant speed running
Cause:
Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake is not enabled.



Remedy:

  • Check input power.

  • Check the setup of related function codes.
OC1
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 occur; Strong external interference sources; Overvoltage stall protection is not enabled.



Remedy:

  • Increase acceleration 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
Over-current during deceleration
Cause:
Deceleration 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 occur; Strong external interference sources.



Remedy:

  • Increase deceleration time.

  • Check input power.

  • Select the VFD with larger power.

  • Check if the load is short circuited.

  • Check the output wiring.

  • Check if there is strong interference.
OC3
Over-current during constant speed running
Cause:
Grid voltage is too low; Load transient or exception occurred; To-ground short circuit or output phase loss occur; Strong external interference sources.



Remedy:

  • Check input power.

  • Check if the load is short circuited.

  • Check the output wiring.

  • Check if there is strong interference.
UV
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
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
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
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
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
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
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
External fault
Cause:
SI external fault input terminal acts.



Remedy:

  • Check external device input.
CE
485 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
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
Motor autotuning fault
Cause:
Motor capacity does not match with VFD capacity (difference exceeds five power classes); Motor parameter set improperly; Autotuning parameters deviate sharply from standard; 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
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
PID feedback offline fault
Cause:
PID feedback offline; PID feedback source disappears.



Remedy:

  • Check PID feedback signal wires.

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



Remedy:

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

  • Increase brake resistance.
END
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
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
Keypad communication fault
Cause:
Keypad wire poorly contacted or disconnected; Keypad wire too long or suffers strong interference; Circuit fault to keypad/comms part of 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
Parameter upload error
Cause:
Keypad wire poorly contacted or disconnected; Keypad wire too long or suffers strong interference; Circuit fault to keypad/comms part of main board.



Remedy:

  • Check the surroundings to rule out interference source.

  • Replace the hardware and ask for maintenance service.
DNE
Parameter download error
Cause:
Keypad wire poorly contacted or disconnected; Keypad wire too long or suffers 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
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
To-ground short circuit fault 1 (2)
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
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
Maladjustment fault
Cause:
Control parameters of synchronous motor is set improperly; The parameter gained from autotuning is inaccurate; The VFD is not connected to motor.



Remedy:

  • Check whether load is proper.

  • Check whether control parameters are set correctly.

  • Increase maladjustment detection time.
LL
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
Encoder offline fault
Cause:
Encoder line sequence is wrong, or signal wires are poorly connected.



Remedy:

  • Check the encoder wiring.
ENC1D
Encoder reversal fault
Cause:
The encoder speed signal is contrary to the motor running direction.



Remedy:

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



Remedy:

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



Remedy:

  • Check the wiring of motor over-temperature input terminal (terminal function 57).

  • Check whether temperature sensor is proper.

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



Remedy:

  • N/A
STL1
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.

  • Replace the control board.
STL2
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.

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



Remedy:

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



Remedy:

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



Remedy:

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

  • Check the type of extension card, and remove one card after power down.
ENCUV
Encoder UVW loss fault
Cause: No electric level variation occurred to UVW signal.



Remedy:

  • Check the wiring of UVW.

  • Encoder is damaged.
F1-Er
Failed to identify the extension 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 extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
F2-Er
Failed to identify the extension card in card slot 2
Cause: There is data transmission in interfaces of card slot 2, however, it cannot read the card type.



Remedy:

  • Confirm whether the extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
F3-Er
Failed to identify the extension card in card slot 3
Cause: There is data transmission in interfaces of card slot 3, however, it cannot read the card type.



Remedy:

  • Confirm whether the extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
C1-Er
Communication timeout occurred to the extension card in card slot 1
Cause: There is no data transmission in interfaces of card slot 1.



Remedy:

  • Confirm whether the extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
C2-Er
Communication timeout occurred to the extension card in card slot 2
Cause: There is no data transmission in interfaces of card slot 2.



Remedy:

  • Confirm whether the extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
C3-Er
Communication timeout occurred to the extension card in card slot 3
Cause: There is no data transmission in interfaces of card slot 3.



Remedy:

  • Confirm whether the extension card inserted can be supported.

  • Stabilize the extension card interfaces after power down, and confirm whether fault still occurs at next power-on.

  • Check whether the insertion port is damaged, if yes, replace the insertion port after power down.
E-DP
Profibus card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

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



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-CAN
CANopen card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-PN
Profinet card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-CAT
EtherCat card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-BAC
BACNet card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
E-DEV
DeviceNET card communication timeout fault
Cause: There is no data transmission between the communication card and the host computer (or PLC).



Remedy:

  • Check whether the communication card wiring is loose or dropped.
ESCAN
Can master/slave communication card communication timeout fault
Cause: There is no data transmission between the CAN master and slave communication cards.



Remedy:

  • Check whether the communication card wiring is loose or dropped.
S-Err
Master-slave synchronous CAN slave fault
Cause: Fault occurred to one of the CAN slave VFDs.



Remedy:

  • Detect the CAN slave VFD and analyze the corresponding fault cause of the VFD.
dIS
Failure to enable the VFD
Cause: The input terminal selects VFD enabling, but the terminal signal is invalid.



Remedy:

  • Check the input terminal setting and terminal signal.
tbE
Contactor feedback fault
Cause: The contactor feedback circuit is disconnected or in poor contact. The contactor feedback detection time is too short.



Remedy:

  • Check the contactor feedback circuit.

  • Increase the detection time P91.05 to a proper value.
FAE
Brake feedback fault
Cause: The brake feedback circuit is disconnected or in poor contact. The brake feedback detection time is too short.



Remedy:

  • Check the brake feedback circuit.

  • Increase the detection time P90.32 to a proper value.
tPF
Torque verification fault
Cause: The torque verification current, moment force setting, and torque verification fault detection time are set improperly.



Remedy:

  • Set the torque verification current, moment force setting, and torque verification fault detection time P90.30 properly.
StC
Operating lever zero-position fault
Cause: The operating lever does not return to the zero position. The operating lever zero-position signal is adhered.



Remedy:

  • Put the operating lever to the zero position.

  • Check out the operating lever zero-position signal.
LSP
Low-speed running protection fault
Cause: The running speed is too low.



Remedy:

  • Check whether the running speed is continuously lower than P92.03.
tCE
Terminal command exception
Cause: The terminal gives both the upward and downward commands at the same time.



Remedy:

  • Check the input terminal signal.
POE
Terminal command exception at power-on
Cause: The terminal command is detected at power-on.



Remedy:

  • Check whether P01.18 is set to enable the VFD reports a fault when a terminal command is valid at power-on.

  • Check the input terminal signal.
SLE
Loose rope protection fault
Cause: The hook rope is abnormal. The downward loose rope parameter setting is improper.



Remedy:

  • Check whether the hook rope is normal.

  • Check whether the downward loose rope detection torque is proper.
bE
Brake failure
Cause: The brake force is insufficient. The brake detection parameter setting is improper.



Remedy:

  • Check whether the brake is normal.

  • Check whether the brake slip parameter setting is proper.
ELS
Master/salve position synchronization fault
Cause: The encoder pulse difference between the master and slave is too great. The pulse threshold setting is improper.



Remedy:

  • Check the encoders for the master and slave.

  • Check whether the pulse threshold of the slave is too small.
AdE
Analog speed reference deviation fault
Cause: If the speed is given by analog, the analog voltage is greater than 1.0V after zero-position detection is complete.



Remedy:

  • Check the analog wiring and current voltage value.
OtE1
PT100 overtemperature fault
Cause: The current environment temperature is too high. PT100 detection circuit is abnormal. PT100 overtemperature protection setting is improper.



Remedy:

  • Check the current environment temperature.

  • Check PT100 circuit.

  • Check whether PT100 overtemperature protection point is too small.
OtE2
PT1000 overtemperature fault
Cause: The current environment temperature is too high. PT1000 detection circuit is abnormal. PT1000 overtemperature protection setting is improper.



Remedy:

  • Check the current environment temperature.

  • Check PT1000 circuit.

  • Check whether PT1000 overtemperature protection point is too small.
SFE
Set frequency fault
Cause: The set frequency is too small.



Remedy:

  • Check whether the frequency reference is smaller than the set frequency protection point.
PtcE
PTC overtemperature fault
Cause: The current environment temperature is too high.



Remedy:

  • Check the current environment temperature.
A-SPI
Input phase loss alarm
Cause: During stop, a loss of either input phase R, S, or T occurs or fluctuation is great.



Remedy:

  • Check the input power source and wiring.
A-LU
Upward position limit alarm
Cause: The input terminal has set the upward limited position reaching function, and there is a signal reference to the terminal.



Remedy:

  • Check whether the allowed highest position point has been reached.

  • Check the input terminal signal.
A-Ld
Downward position limit alarm
Cause: The input terminal has set the downward limited position reaching function, and there is a signal reference to the terminal.



Remedy:

  • Check whether the allowed lowest position point has been reached.

  • Check the input terminal signal.
A-LvP
Low voltage alarm
Cause: The bus voltage is too low.



Remedy:

  • Check whether the voltage protection point is too high.

  • Check whether the grid voltage or rectifier module is abnormal.
A-OL
Overload protection alarm
Cause: The load is too heavy. The overload protection parameter is set improperly.



Remedy:

  • Check whether the load is too heavy.

  • Check whether the overload protection point is too small.
A-bS
Brake failure alarm
Cause: The brake force is insufficient. The encoder is abnormal. The zero servo detection parameter is set improperly.



Remedy:

  • Check whether the brake works normally.

  • Check whether the encoder works normally.

  • Check whether the zero servo tolerance pulse threshold is too small.
A-FA
Brake feedback alarm
Cause: The brake feedback circuit is disconnected or in poor contact. The brake feedback detection time is too short.



Remedy:

  • Check the brake feedback circuit.

  • Increase the detection time P90.32 to a proper value.
A-SL
Loose rope protection alarm
Cause: The hook rope is abnormal. The downward loose rope parameter setting is improper.



Remedy:

  • Check whether the hook rope is normal.

  • Check whether the downward loose rope detection torque is proper.
A-Ot1
PT100 overtemperature alarm
Cause: The current environment temperature is too high. PT100 overtemperature protection setting is improper.



Remedy:

  • Check the current environment temperature.

  • Check whether PT100 overtemperature protection point is too small.
A-Ot2
PT1000 overtemperature alarm
Cause: The current environment temperature is too high. PT1000 overtemperature alarm setting is improper.



Remedy:

  • Check the current environment temperature.

  • Check whether PT1000 overtemperature protection point is too small.
A-Pt1
PT100 disconnection alarm
Cause: PT100 connection circuit is opened.



Remedy:

  • Check PT100 connection circuit.
A-Pt2
PT1000 disconnection alarm
Cause: PT1000 connection circuit is opened.



Remedy:

  • Check PT1000 connection circuit.
A-Ptc
PTC overtemperature alarm
Cause: The current environment temperature is too high.



Remedy:

  • Check the current environment temperature.
PoFF
System power failure
Cause: The system is powered off or the bus voltage is too low.



Remedy:

  • Check the grid conditions.