4 Troubleshooting
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4 Troubleshooting
4�1 Faults and Solutions
Display Fault Name Possible Causes Solutions
Err02 Overcurrent during
acceleration
1� The output circuit is short circuited�
2� The acceleration time is too short�
3� Manual torque boost or V/F curve is not
appropriate�
4� The power supply is too low�
5� The startup operation is performed on the
rotating motor�
6� A sudden load is added during acceleration�
7� The AC drive model is of too small power
class�
1: Eliminate short circuit�
2: Increase the acceleration time�
3: Adjust the manual torque boost or V/F curve�
4: Check that the power supply is normal�
5: Select speed tracking restart or start the motor
after it stops�
6: Remove the added load�
7: Select a drive of higher power class�
Err03 Overcurrent during
deceleration
1� The output circuit is short circuited�
2� The deceleration time is too short�
3� The power supply is too low�
4� A sudden load is added during deceleration�
5� The braking resistor is not installed�
1: Eliminate short circuit�
2: Increase the deceleration time�
3: Check the power supply, and ensure it is
normal�
4: Remove the added load�
5: Install the braking resistor�
Err04 Overcurrent at
constant speed
1� The output circuit is short circuited�
2� The power supply is too low�
3� A sudden load is added during operation�
4� The AC drive model is of too small power
class�
1: Eliminate short circuit�
2: Adjust power supply to normal range�
3: Remove the added load�
4: Select a drive of higher power class�
Err05 Overvoltage during
acceleration
1� The DC bus voltage is too high�
2� An external force drives the motor during
acceleration�
3� The acceleration time is too short�
4� The braking resistor is not installed�
1: Replace with a proper braking resistor�
2: Cancel the external force or install braking
resistor�
3: Increase the acceleration time�
4: Install a braking resistor�
Err06 Overvoltage during
deceleration
1� The DC bus voltage is too high�
2� An external force drives the motor during
deceleration�
3� The deceleration time is too short�
4� The braking resistor is not installed�
1: Replace with a proper braking resistor�
2: Cancel the external force or install braking
resistor�
3: Increase the deceleration time�
4: Install the braking resistor
Err07 Overvoltage at
constant speed
1� The DC bus voltage is too high�
2� An external force drives the motor during
deceleration�
1: Replace with a proper braking resistor�
2: Cancel the external force�
Voltage thresholds
Voltage Class DC Bus Overvoltage DC Bus Undervoltage Braking Unit Operation Level
Single-phase 220 V 400V 200V 381V
Three-phase 220 V 400V 200V 381V
Three-phase 380 V 810V 350V 700V
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