General Troubleshooting

    Condition: Is the motor not running?
    Checkpoint: Is power applied to L1(L), L2, and L3(N) terminals (is the charge indicator on)?
    Solution: Is power applied? Turn OFF the power and then turn it ON again. Make sure the power voltage is correct. Ensure that the screws are tightly secured.

    Condition: Is there voltage between output terminals T1, T2, and T3?
    Solution: Turn OFF the power and then turn it ON again.

    Condition: Is there an overload due to motor jamming?
    Solution: Reduce the load to allow the motor to operate.

    Condition: Is there any abnormality in the inverter?
    Checkpoint: Is a forward or reverse running command given?
    Solution: Check and correct the wiring according to error descriptions.

    Condition: Is the analog frequency signal input?
    Checkpoint: Is the wiring of the analog frequency input signal correct? Is the voltage of the frequency input correct?
    Solution: Is the operating mode setting correct? Perform operations on the digital panel.

     Condition: Is the motor running but in the reverse direction?
    Checkpoint: Is the wiring correct for output terminals T1, T2, and T3?
    Solution: Ensure that the wiring matches the motor's U, V, and W terminals. Is the wiring correct for forward and reverse signals? Check the wiring if necessary.

    Condition: Can't adjust the motor speed?
    Checkpoint: Is the wiring correct for analog frequency inputs?
    Solution: Check the wiring if necessary. Is the operating mode setting correct? Check the operator's operating mode.

    Condition: Is the motor operating speed too high or too low?
    Checkpoint: Is the load too heavy?
    Solution: Reduce the load. Are the motor specifications (poles, voltage...) correct? Confirm the motor specifications. Is the gear ratio correct? Confirm the gear ratio. Is the maximum output frequency setting correct? Confirm the maximum output frequency.

    Condition: Is the motor speed changing unusually?
    Checkpoint: Is the load too heavy?
    Solution: Reduce the load. Is the load changing significantly? Minimize the change in load. Increase the capacities of the inverter and motor. Is the input power phase missing? Add an AC reactor on the power input side (if single-phase power is used). Check the wiring (if three-phase power is used).

Error Display and Solution

Errors Not Corrected Manually

CPF - Program Problem
    Cause: External noise interference
    Solution: Connect a parallel RC surge absorber to the magnetizing coil of the magnetic contactor

EPR - EEPROM Problem
    Cause: Faulty EEPROM
    Solution: Replace the EEPROM

-OV- - Ou/ Over Voltage during Stop
    Cause: Detection circuit failure
    Solution: Send the inverter for repair

-LV- - Lu/Low Voltage during Stop
    Cause: 1. Power voltage too low 2. Limiting resistor or fuse blown 3. Detection circuit failures
    Solution: 1. Check if the power voltage is correct 2. Replace the limiting resistor or fuse 3. Send the inverter for repair

-OH- - Overheating of Inverter during Stop
    Cause: 1. Detection circuit failures 2. Ambient temperature too high or poor ventilation
    Solution: 1. Send the inverter for repair 2. Improve ventilation conditions

CTER - Current Sensor Detection Error
    Cause: Current sensor error or circuit failures
    Solution: Send the inverter for repair

OC-S - Overcurrent at Start
    Cause: 1. Motor winding and casing short circuit 2. Motor connections and ground short circuit 3. IGBT module damaged
    Solution: 1. Examine the motor 2. Examine the wiring 3. Replace the transistor module

OC-D - Overcurrent during Deceleration
    Cause: Preset deceleration time too short
    Solution: Set a longer deceleration time

OC-A - Overcurrent during Acceleration
    Cause: 1. Acceleration time too short 2. Motor capacity higher than inverter capacity 3. Short circuit between motor winding and casing 4. Short circuit between motor wiring and ground 5. IGBT module damaged
    Solution: 1. Set a longer acceleration time 2. Replace with an inverter of the same capacity as the motor 3. Check the motor 4. Check the wiring 5. Replace the IGBT module

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