F7995 fault in siemens sinamics V90 drive indicates a Motor identification failure. This means the drive could not successfully perform its initial pole position identification, typically because the motor was not fully stopped before being energized.
Cause:
For incremental motor, needs pole position identification when first SON. If motor already in run (i.e. by external force) position identification may failure.
Remedy:
Stop motor before SON.
