Cause : Inverter output fault comes when the inverter output is shutoff when a fault occurred on the inverter output side (load side) during operation when "1 (initial value)" is set in Pr.631 Inverter output fault detection enable/disable selection. The inverter may not be able to detect errors when the carrier frequency or running frequency is too high.

1. Check for a ground fault in the motor and connection cable.
2. Remedy the earth (ground) fault portion.
3. Check the Pr.631 setting.