Delta Uoc fault code meaning

Series: MH300

Short circuit in phase U detected before operation

AC motor drive

Meaning: A short circuit in phase U is detected during output wiring detection 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 caused Aoc.
• B1 corresponds to U, V, and W; DC- corresponds to U, V, and W
• Corresponds to U, V, and W

Source: MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P293