Cause : Output phase loss comes when open phase is present in the motor or when you run drive without motor. An "LF" fault code- "output phase loss fault" indicate that one of the phases in the output of a three-phase electrical system is lost or disconnected.

1. A loose connection or splice is present.
2. An external device between the motor and drive has failed.
3. An open phase is present in the motor.
4. Check U-V-W motor wiring.
5. Check the load.