Delta Coc fault code meaning

Series: MP300

Short circuit in phase W detected before operation

AC motor drive

Meaning: A short circuit in phase W is detected during the output wiring check before the AC motor drive starts running.

Possible causes

• Motor wiring error
• Check whether faulty insulation in the motor wiring causes the output
• Short circuit
• Malfunction due to interference
• The motor cable wiring length is long.
• Increase the capacity of the AC motor drive.
• U/V/W Install a AC reactor on the output side.
• Hardware fault
• A short circuit or ground fault on the output side of the AC motor drive causes Coc.
• B1 corresponds to U, V, and W; DC- corresponds to U, V, and W
• Corresponds to U, V, and W

Source: MPD_MP300 Series User Manual (DELTA_IA-MDS_MPD_UM_SC_20260326) P433