Delta ocA fault code meaning

Series: C2000-R, CT2000, MS300-HS, VFD-BP, VFD-BW, VFD-DD, VFD-E, VFD-ED, VFD-EL-W, VFD-FE, VFD-L2, VFD-M-D, VFD-MP, VFD-VE, VFD-VL

Overcurrent during acceleration

AC motor drive

Meaning:

Possible causes

Source: C2000-R User Manual P217; CT2000 Series User Manual (DELTA_IA-MDS_CT2000_UM_SC_20250522) P246; MS300 (High-speed Models) (DELTA_IA-MDS_VFD MS300_high_UM_TC_20170306) P140; Delta VFD-BP Manual P51; Delta VFD-BW Manual P72; VFD-DD (Ver. F, S, T & V) (DELTA_IA-MDS_VFD-DD_UM_TC_20170609) P35; Delta VFD-E Manual P52; VFD-ED Series User Manual (DELTA_IA-MDS_VFD-ED_UM_SC_20170315) P124; VFD-EL-W Series User Manual P57; Delta VFD-FE Manual P41; Delta VFD-L2 Manual P2; Delta VFD-M-D Manual P44; Delta VFD-MP Manual P41; Delta VFD-VE Manual P65; Delta VFD-VL Manual P61

Series: HES-C

Overcurrent during acceleration

hydraulic servo drive

Meaning:

Possible causes

Source: HES-C Technical Manual (DELTA_IA-MDS_VFD-HES_UM_TC_20250715) P100

Series: MS300

Overcurrent during acceleration

AC motor drive

Meaning: During acceleration, the output current exceeds 3 times the rated current of the AC motor drive. When ocA occurs, the AC motor drive output is immediately shut off, the motor coasts, and the panel displays the ocA error.

Possible causes

1.
2.
3.
4.
5.
Check whether faulty insulation in the motor wiring causes the output
Short circuit

Source: MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P246

Series: MX300

Overcurrent during acceleration

AC motor drive

Meaning: During acceleration, the output current exceeds 2.5 times the rated current of the AC motor drive. When ocA occurs, the AC motor drive output is immediately disabled, the motor coasts, and the panel displays the ocA error.

Possible causes

1.
2.
3.
4.
5.
Faulty motor wiring insulation causes an output short circuit.
Used on the AC motor drive output side (U/V/W)
Electromagnetic contactor opening and closing control

Source: MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P137