Cause : Ground Fault comes when a current short to ground exceeded 50% of rated current on the output side of the drive. Setting L8-09 to 1 enables ground fault detection.

1. Motor insulation is damaged:

• Check the insulation resistance of the motor.
• Replace the motor.

2. A damaged motor cable is creating a short circuit:

• Check the motor cable.
• Remove the short circuit and reapply power to the drive
• Check the resistance between the cable and the ground terminal .
• Replace the cable.

3. Excessive leakage current at the drive output:

• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.

4. The drive performed a current offset adjustment while the motor was rotating:
• The set value exceeds the allowable setting range while the drive automatically adjusts the current offset. This generally only happens when attempting to restart a PM motor that is coasting to stop.
• Set b3-01 to 1 to enable Speed Search at Start.
• Perform Speed Search 1 or 2 (H1-oo = 61 or 62) via one of the external terminals.

5. Hardware problem

- if the problem continues, replace the control board or the entire drive