Fault solution (for invt vfd)

Only qualified electricians are allowed to maintain the VFD. Read the safety instructions in chapter Safety precautions before working on the VFD.

  Alarm and fault indications
Fault is indicated by LEDs. See Operation Procedure. When TRIP light is on, an alarm or fault message on the panel display indicates abnormal VFD state. Using the information given in this chapter, most alarm and fault cause can be identified and corrected. If it cannot be fixed, please contact our technical support department from invt communication section..

   How to reset
The VFD can be reset by pressing the keypad key STOP/RST, through digital input, or by switching the power light. When the fault has been removed, the motor can be restarted.

 Fault instruction and solution
Do as the following after the VFD fault:
1. Check to ensure there is nothing wrong with the keypad. If it cannot be fixed, please contact our technical support department from invt communication section..
2. If there is nothing wrong, please check P07 and ensure the corresponding recorded fault parameters to confirm the real state when the current fault occurs by all parameters.
3. See the following table for detailed solution and check the corresponding abnormal state.
4. Eliminate the fault and ask for relative help.
5. Check to eliminate the fault and carry out fault reset to run the VFD.

OUt1 IGBT Ph-U fault
OUt2 IGBT Ph-V fault
OUt3 IGBT Ph-W fault

- Acceleration is too fast;
- IGBT module damaged;
- Misacts caused by interference;
- The connection of the drive wire is not good;
To-ground short circuit Increase acceleration time;
Replace the power unit;
Check drive wires;
Check whether there is strong interference caused by external equipment
///
OC1 Over-current during acceleration
OC2 Over-current during deceleration
OC3 Over-current when running at constant speed
- Acceleration is too fast;
- Grid voltage is too low;
- VFD power is too small;
- Load transients or is abnormal;
To-ground short circuit or output phase loss occur;
There is strong external interference;
The overvoltage stall protection is not open ncrease acceleration time;
Check input power;
Select the VFD with a larger power;
Check if the load is short circuited (to-ground short circuit or line-to-line short circuit) or the rotation is not smooth;
Check the output wiring;
Check if there is strong interference;
Check the setting of related function codes. If it cannot be fixed, please contact our technical support department from invt communication section.
///
OV1 Over-voltage during acceleration
OV2 Over-voltage during deceleration
OV3 Over-voltage when running at constant speed
- The input voltage is abnormal;
- There is large energy feedback;
- No brake components;
Braking energy is not open
Check the input power;
Check if the load deceleration time is too short or the VFD starts during the rotation of the motor or it is necessary to install dynamic braking components;
Install the brake resistor components;
Check the setting of related function codes
///
UV DC bus under-voltage
The voltage of the power supply is too low
Check the input power of the supply line
///
OL1 Motor overload
1. The voltage of the power supply is too low.
2. The motor setting rated current is incorrect.
3. The motor stall or load transients is too strong.
1. Check grid voltage
2. Reset the rated current of the motor
3. Check the load and adjust the torque lift
///
OL2 VFD overload
1. Acceleration is too fast
2. Restart the rotating motor
3. Grid voltage is too low.
4. The load is too heavy.
5. The rated power is much larger than the power actually needed
1. Increase acceleration time
2. Avoid restarting after stopping.
3. Check the grid voltage
4. Select an VFD with larger power.
5. Select a proper motor.
///
OL3 Electrical overload
The VFD will report overload pre-alarm according to the set value.
Check the load and the overload pre-alarm point.
///
SPI Input phase loss
Phase loss or fluctuation of input R, S, T
1. Check input power or dc bus
2. Check installation wiring
///
SPO Output phase loss
U, V, W phase loss output (or serious asymmetrical three phase of the load)
1. Check the output wiring
2. Check the motor and cable
///
OH1 Rectify overheat
OH2 IGBT overheat
- Air duct is blocked or fan is damaged;
- Ambient temperature is too high;
- The time of overload running is too long;
Refer to the overcurrent solution;
Redistribute; dredge the wind channel or change the fan;
Lower down the ambient temperature;
Check and reconnect;
Change the power;
Change the power unit;
Change the main control panel
///
EF External fault
SI external fault digital input terminals acts
Check the external device input
///
CE Communication error
- The baud rate setting is incorrect;
- Fault occurs to the communication circuit;
- The communication address is wrong;
- There is strong interference to the communication
Set proper baud rate;
Check the wiring of communication connection interface;
Set proper communication address;
Chang or replace the wiring or improve the anti-interference capability
///
ItE Current detection fault
- The connection of the control board is not good;
- Assistant power is bad;
- Hall components is broken;
- The magnifying circuit is abnormal
Check the connector and plug wire again;
Change the hall;
Change the main control panel
///
tE Autotuning fault
- The motor capacity does not match with VFD capacity;
- The rated parameter of the motor is set improperly;
- The deviation between the parameters from autotune and the standard parameter is huge;
Autotune overtime Change the VFD model;
Set the rated parameter according to the motor nameplate;
Empty the motor load;
Check the motor connection and set the parameter;
Check if the upper limit frequency is above 2/3 of the rated frequency.
///
EEP EEPROM fault
- Error occurred to R/W of the control parameter;
EEPROM is damaged Press STOP/RST to reset;
Change the main control panel
///
PIDE PID feedback fault
- PID control feedback offline;
- PID feedback source disappear
Check the PID feedback signal wire;
Check the PID feedback source
///
bCE Brake unit fault
- Braking circuit fault or damage to the brake pipes;
- The external brake resistor is not sufficient
Check the brake unit and change to new brake pipe;
Increase the brake resistor
///
END Time reach of factory setting
- The actual running time of the VFD is larger than the internal setting running time
Ask for the supplier and adjust the setting running time
///
PCE Keypad communication error
- The keypad is not in good connection or offline;
- The keypad cable is too long and there is strong interference;
- Part of the communication circuits of the keypad or main board have fault
Check the keypad cable and ensure it is normal;
Check the environment and eliminate the interference source;
Change hardware and ask for maintenance service. If it cannot be fixed, please contact our technical support department from invt communication section.
///
UPE Parameter upload error
- The keypad is not in good connection or offline;
- The keypad cable is too long and there is strong interference;
- Part of the communication circuits of the keypad or main board have fault
Check the environment and eliminate the interference source;
Replace the hardware and ask for maintenance service;
Change hardware and ask for maintenance service
///
DNE Parameter download error
- The keypad is not in good connection or offline;
- The keypad cable is too long and there is strong interference;
- Data storage error in keypad Check the environment and eliminate the interference source;
Replace the hardware and ask for maintenance service;
Backup data in the keypad again
///
ETH1 Grounding shortcut fault 1
ETH2 Grounding shortcut fault 2
- The output of the VFD is short circuited to the ground;
- There is fault in the current detection circuit;
- There is a great difference between the actual motor power setting and the VFD power
Check if the connection of the motor is normal or not;
Replace the hall;
Replace the main control panel;
Reset motor parameters and ensure those parameters are correct;
Check whether motor power parameters in P2 group are consistent with the motor power actually used
///
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.
///
STO Safe torque off

- STO function operates normally
- STL1 Channel H1 abnormal
Fault or internal hardware circuit fault occurred to H1 channel
- STL2 Channel H2 abnormal Fault or internal hardware circuit fault occurred to H2 channel
- STL3 Internal circuit abnormal
Fault or internal hardware circuit fault occurred to H1 and H2 channels simultaneously
Replace STO switch; if problem persists after replacement, contact the manufacturer.
///
CrCE Safe code
- FLASH CRC check fault
Error occurred to STO safe code FLASH CRC check
Contact the manufacturer
///
PoFF System power off
- System power off or low DC voltage
Check the grid

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