Delta Aoc fault code meaning
Delta / Aoc
Series: ME300, MH300-HS, MS300, MX300
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
- 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: ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P181; MH300 Series (High-speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P253; MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P247; MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P139
Series: MH300
FH Short circuit in phase U detected before operation
AC motor drive
Meaning:
Possible causes
Source: MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P896
Series: MP300
Short circuit in phase U detected before operation
AC motor drive
Meaning: A short circuit in phase U 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 caused Aoc.
- 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) P145