Delta ocn fault code meaning

Series: C2000-R, VFD-ED

Overcurrent during constant-speed operation

AC motor drive

Meaning:

Possible causes

Source: C2000-R User Manual P217; VFD-ED Series User Manual (DELTA_IA-MDS_VFD-ED_UM_SC_20170315) P124

Series: CT2000

Overcurrent at constant speed

AC motor drive

Meaning:

Possible causes

Source: CT2000 Series User Manual (DELTA_IA-MDS_CT2000_UM_SC_20250522) P247

Series: HES-C

Overcurrent during operation

hydraulic servo drive

Meaning:

Possible causes

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

Series: MS300

Overcurrent during constant-speed operation

AC motor drive

Meaning: During constant-speed operation, the output current exceeds 3 times the rated current of the AC motor drive. When ocn occurs, the AC motor drive output is immediately shut off, the motor coasts, and the panel displays the ocn error.

Possible causes

• Check whether faulty insulation in the motor wiring causes the output
• Short circuit
• B1 corresponds to U, V, and W; DC- corresponds to U, V, and W
• Corresponds to U, V, and W
• Used on the output side of the AC motor drive (U / V / W)
• Electromagnetic contactor opening and closing control

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

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

Overcurrent at constant speed

AC motor drive

Meaning:

Possible causes

Source: MS300 (high-speed model) (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-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: MX300

Overcurrent during constant-speed operation

AC motor drive

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

Possible causes

• 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
• Corresponds to U, V, and W
• 8-42

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

Series: REG2000

Overcurrent during regeneration

regenerative unit

Meaning:

Possible causes

Source: REG2000 Series User Manual (DELTA_IA-MDS_REG2000_UM_SC_20251117) P92

Series: VFD-S

Overcurrent at constant speed

AC motor drive

Meaning: Current exceeds 2 times the rated current

Possible causes

Source: Delta VFD-S Instruction Manual P47