Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
4
Ground fault
(GFF)
When the drive detects grounding short circuit on
the output terminals (U/V/W), the drive closes the
gate of the output immediately, the motor runs
freely, and the display shows a GFF error.
Action and Reset
Action condition N/A
Action time N/A
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset in five seconds after the fault is cleared
Record Yes
Cause Corrective Actions
Motor burnout or aging
insulation occurred
Check the motor insulation value with megger.
Replace the motor if the insulation is poor.
Short circuit due to broken
cable
Troubleshoot the short circuit.
Replace the cable.
Larger stray capacitance of the
cable and terminal
If the motor cable length exceeds 100 m, decrease the setting value for
the carrier frequency.
Take remedies to reduce stray capacitance.
Malfunction caused by
interference
Verify the grounding and wiring of the communication circuit. It is
recommended to separate the communication circuit from the main
circuit, or wire in 90 degree for effective anti-interference performance.
Hardware failure
Cycle the power after checking the status of motor, cable and cable
length. If GFF still exists, return to the factory for repair.
Over-current at constant speed Refer to the corrective actions for ocn.
Over-current during
acceleration
Refer to the corrective actions for ocA.
Over-current during
deceleration
Refer to the corrective actions for ocd.
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