Cause : PG feedback stall comes when the motor frequency exceeds the encoder observer stall level and starts to count, the fault time is longer than the detection time of encoder observer stall, then PGF3 fault occurs.

1. Incorrect setting of encoder parameter. Reset encoder parameter (Pr.10-01).
2. Set proper value for Pr.01-00.
3. Reset ASR parameters.
4. Set correct accel./decel. time.
5. Reset proper values for Pr.10-10 and Pr. 10-11.