INVT GD20-09 Series Drive Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
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| OUt1 Inverter unit U phase protection | Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; To-ground short-circuit occurs. Remedy:
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| OUt2 Inverter unit V phase protection | Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; To-ground short-circuit occurs. Remedy:
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| OUt3 Inverter unit W phase protection | Cause: Acceleration is too fast; IGBT module is damaged; Misacts caused by interference; Drive wires are poorly connected; To-ground short-circuit occurs. Remedy:
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| OV1 Overvoltage during acceleration | Cause: Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake is not enabled. Remedy:
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| OV2 Overvoltage during deceleration | Cause: Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake is not enabled. Remedy:
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| OV3 Overvoltage during constant speed | Cause: Exception occurred to input voltage; Large energy feedback; Lack of braking units; Dynamic brake is not enabled. Remedy:
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| OC1 Overcurrent during acceleration | Cause: Acceleration is too fast; The voltage of the grid is low; The power of the VFD is low; Load transient or exception occurred; To-ground short circuit or output phase loss occur; Strong external interference. Remedy:
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| OC2 Overcurrent during deceleration | Cause: Deceleration is too fast; The voltage of the grid is low; The power of the VFD is low; Load transient or exception occurred; To-ground short circuit or output phase loss occur; Strong external interference. Remedy:
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| OC3 Overcurrent during constant speed | Cause: The voltage of the grid is low; The power of the VFD is low; Load transient or exception occurred; To-ground short circuit or output phase loss occur; Strong external interference. Remedy:
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| UV Bus undervoltage | Cause: The voltage of the grid is low; Overvoltage stall protection is not enabled. Remedy:
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| OL1 Motor overload | Cause: The voltage of the grid is too low; The rated current is set improperly; Motor stall or load jumps violently. Remedy:
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| OL2 VFD overload | Cause: The acceleration is too fast; The rotating motor is restarted; The voltage of the grid is too low; The load is too heavy; The motor power is too large, and the power of the VFD is too small. Remedy:
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| SPI Phase loss on the input side | Cause: Phase loss or violent fluctuation occurred to R, S and T input. Remedy:
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| SPO Phase loss on the output side | Cause: Phase loss occurred to U, V, W output (or the three phases of the load are seriously asymmetrical). Remedy:
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| OH1 Rectifier module overheat | Cause: Air duct is blocked or fan is damaged; Ambient temperature is too high; Long-time overload. Remedy:
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| OH2 Inverter module overheat | Cause: Air duct is blocked or fan is damaged; Ambient temperature is too high; Long-time overload. Remedy:
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| EF External fault | Cause: SI external fault input terminal acts. Remedy:
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| CE 485 communication fault | Cause: Baud rate is set improperly; The communication line is faulty; Communication address error; Communication suffers from strong interference. Remedy:
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| ItE Current detection fault | Cause: The connector of control board is in poor contact; Exception occurred to amplification circuit. Remedy:
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| tE Motor autotuning fault | Cause: Motor capacity does not match with the VFD capacity; Motor parameters are set improperly; The parameters gained from autotuning deviate sharply from the standard parameters; Autotuning timeout. Remedy:
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| EEP EEPROM operation fault | Cause: R/W error occurred to the control parameters; EEPROM is damaged. Remedy:
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| bCE Brake unit fault | Cause: Brake circuit fault or brake tube is damaged; The resistance of external braking resistor is too small. Remedy:
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| END Running time reached | Cause: The actual running time of the VFD is larger than the preset running time. Remedy:
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| OL3 Electronic overload fault | Cause: The VFD performs overload pre-alarm based on the set value. Remedy:
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| PCE Keypad communication error | Cause: The keypad wire is poorly contacted or disconnected; The keypad wire is too long and suffers strong interference; Circuit fault occurred to the keypad or communication part of the main board. Remedy:
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| UPE Parameter upload error | Cause: The keypad wire is poorly contacted or disconnected; The keypad wire is too long and suffers strong interference; Circuit fault occurred to the keypad or communication part of the main board. Remedy:
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| DNE Parameter download error | Cause: The keypad wire is poorly contacted or disconnected; The keypad wire is too long and suffers strong interference; Data storage error occurred to the keypad. Remedy:
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| 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:
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| ETH2 To-ground short circuit fault 2 | 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:
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| LL Electronic underload fault | Cause: The VFD performs underload pre-alarm based on the set value. Remedy:
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| LC Current limiting fault | Cause: The VFD performs current limit pre-alarm based on the set current limit value. Remedy:
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| FAE Brake feedback fault | Cause: The brake feedback circuit is disconnected or poorly contacted; The brake feedback detection time is too short. Remedy:
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| tPF Torque verification fault | Cause: The torque verification current, moment force setting, and torque verification fault detection time are set improperly. Remedy:
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| StC Operating lever fault | Cause: After the zeroing function is enabled, the operating lever restarts the VFD operation when it does not return to the zero position successfully. Remedy:
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| LSP Low-speed running protection fault | Cause: The running frequency is too low; Frequency for low-speed running protection is set to too high. Remedy:
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| tCE Terminal command exception | Cause: Forward and reverse running commands are given simultaneously. Remedy:
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| POE Terminal command exception at power-on | Cause: The wiring of running command terminals has been short-circuited before power-on, or the polarity of terminals is set to be wrong; The state of the input terminal is inconsistent with the actual input. Remedy:
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| SFE Set frequency fault | Cause: After the brake control is enabled, set P27.18 to 1 to enable the reference frequency detection. Set frequency is less than the value set in P27.19. Remedy:
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| PTCE PTC motor overtemperature fault | Cause: The terminal selects PTC signal, and the terminal is valid due to too high motor temperature. Remedy:
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| dIS Failure to enable the VFD | Cause: The input terminal selects VFD enabling, but the terminal signal is invalid. Remedy:
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| A-OL Overload protection alarm | Cause: The load is too heavy. Remedy:
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| A-LvP Low voltage alarm | Cause: The bus voltage is too low. Remedy:
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| 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:
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| 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:
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| A-Pt PT100 disconnection alarm | Cause: PT100 wiring circuit is disconnected. Remedy:
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| A-Ot P100 overtemperature alarm | Cause: The current ambient temperature is too high; PT100 overtemperature prealarm setting is improper. Remedy:
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| A-PTC PTC overtemperature alarm | Cause: The current ambient temperature is too high. Remedy:
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| A-SSF Set frequency before brake release too small | Cause: Set frequency before brake release is less than brake release frequency. Remedy:
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| A-rSF Set frequency after brake release too small | Cause: Set frequency after brake release is less than brake closing frequency. Remedy:
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| 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:
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| PoFF System power failure | Cause: The system is powered off or the bus voltage is too low. Remedy:
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