Mitsubishi FR-E Series- FR-E800 & FR-E700 Drive
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Apr 02, 2024 7:41 am
Cause : Output side earth (ground) fault overcurrent comes when the inverter trips if an earth (ground) fault overcurrent flows due to an earth (ground) fault that occurred on the inverter's output side (load side).
- Check for an earth (ground) fault in the motor and connection cable.
- Remedy the earth (ground) fault portion.
2 Replies
Oct 15, 2025 7:56 am
Halo, i have same problem E.GF for my Inverter A800 series.
I have done doing several action, such as:
- Check earth (ground) fault in the motor and connection cable. (all OK)
- cycle power for a minute, inverter can running again with no fault, but still alarm E.GF or E.OC1 occurs in random time
- Replacement inverter with the new one (problem solved, alarm not appears again)
can you help me what the root cause for this inverter problem, i want to repair my problem inverter
hoping u can help, thanks
Oct 18, 2025 11:10 am
This fault comes due to faulty IGBT or IGBT driving circuit and also faulty CT.
- First check physically for flash or burn mark.
- Check IGBT using multimeter.
