Over-current during steady operation (ocn)

Output current exceeds three times of the rated current
during constant speed.
When ocn occurs, the drive closes the gate of the output
immediately, the motor runs freely, and the display
shows an ocn error.

The ocn occurs due to the short circuit or ground fault at the output side of the
drive.
Check for possible short circuit between terminals with the electric meter:
B1 corresponds to U, V and W; DC- corresponds to U, V, and W;
corresponds to U, V, and W.