Over-current during steady operation (ocn)

Output current exceeds 2.4 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.

Short-circuit at motor output due to poor insulation wiring - Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.

The ocn occurs due to 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, W; DC- corresponds to U, V, W; corresponds to U, V, W.

Check drive rectifier & IGBT using multimeter.
Check wiring.
Check drive hardware using multimeter.