6 Troubleshooting
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6.2 Fault Codes and Troubleshooting
Display Fault Name Possible Causes Solutions
Overcurrent during
acceleration
Ground fault or short circuit exists in the output
circuit.
Check whether short-circuit occurs on the motor,
the motor cable or contactor.
Acceleration time is too short. Increase acceleration time.
Customized torque boost or V/F curve is not
appropriate.
Adjust the customized torque boost or V/F curve.
The voltage is too low. Adjust the voltage to normal range.
The spinning motor is started.
Enable the catching a spinning motor function or
start the motor after it stops.
A load is applied suddenly during acceleration. Cancel the suddenly added load.
The rated AC drive power is low. Replace the drive by one with higher rated power.
The braking resistor resistance is small.
The braking resistor is short circuited.
Replace a new braking resistor.
Overcurrent during
deceleration
Ground fault or short circuit exists in the output
circuit.
Check whether short-circuit occurs on motor,
motor cable or contactor.
Acceleration time is too short. Increase acceleration time.
The voltage is too low. Adjust the voltage to normal range.
A load is added suddenly during deceleration. Cancel the suddenly added load.
Braking unit and braking resistor are not
installed.
Install the braking unit and braking resistor.
The braking resistor resistance is small.
The braking resistor is short circuited.
Replace a new braking resistor.
Overcurrent at
constant speed
Ground fault or short circuit exists in the output
circuit.
Check whether short-circuit occurs on the motor,
motor cable or contactor.
The voltage is too low. Adjust the voltage to normal range.
A load is added suddenly during running. Cancel the suddenly added load.
The rated AC drive power is low. Replace the drive by one with higher rated power.
The braking resistor resistance is small.
The braking resistor is short circuited.
Replace a new braking resistor.
Overvoltage during
acceleration
Input voltage is too high. Adjust input voltage to normal range.
An external force drives motor during
acceleration.
Cancel the external force.
Braking unit and braking resistor are not
installed.
Install the braking unit and braking resistor.
Acceleration time is too short. Increase acceleration time.
Overvoltage during
deceleration
Input voltage is too high. Adjust input voltage to normal range.
An external force drives motor during
deceleration.
Cancel the external force or install the braking
resistor.
Deceleration time is too short. Increase deceleration time.
Braking unit and braking resistor are not
installed.
Install the braking unit and braking resistor.
Overvoltage at
constant speed
Input voltage is too high. Adjust input voltage to normal range.
An external force drives motor during running.
Cancel the external force or install a braking
resistor
Control power fault
Input voltage is not within the permissible
range.
Adjust the input voltage in the permissible range.
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