Delta ovn fault code meaning
Delta / ovn
Series: C2000 Plus, CFP2000, CH2000, CP2000, ME300, MH300-HS, MH300, VP3000-E, VP3000
Overvoltage during constant-speed operation
AC motor drive
Meaning: During constant speed operation, the AC motor drive detects overvoltage on the internal high-voltage DC side. When ovn occurs, the AC motor drive output is immediately shut off, the motor coasts, and the panel displays error ovn.
Possible causes
- Rapid load change
- 1. Connect a braking resistor, braking resistor unit, or common DC bus to the AC motor drive.
- Check whether the stall prevention action condition setting is less than
- No-load current
- The stall prevention action condition setting should be greater than the no-load current.
- Motor inertia voltage rise
- Supply voltage too high
- A power factor correction capacitor is being switched within the same power supply system.
- Action
- If a power factor correction capacitor or an active power supply device operates within the same power supply system, the input voltage may briefly rise abnormally and sharply. Install a AC reactor.
Source: C2000 Plus Series User Manual (DELTA_IA-MDS_C2000 Plus_UM_TC_20250522) P420; CFP2000 Series User Manual (DELTA_IA-MDS_CFP2000_UM_SC_20250731) P283; CH2000 Series User Manual (DELTA_IA-MDS_CH2000_UM_SC_20251030) P381; CP2000 Series User Manual (DELTA_IA-MDS_CP2000_UM_SC_20250704) P391; ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P180; MH300 Series (High-Speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P252; MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P292; VP3000-E & VP3000-EHS User Manual (DELTA_IA-MDS_VP3000-E-VP3000-EHS_UM_SC_20260306) P402; VP3000 Series User Manual (DELTA_IA-MDS_VP3000_UM_TC_20250523) P437
Series: C2000-R
Overvoltage during constant-speed operation
AC motor drive
Meaning:
Possible causes
Source: C2000-R User Manual P217
Series: CT2000
Overvoltage during constant-speed operation
AC motor drive
Meaning:
Possible causes
Source: CT2000 Series User Manual (DELTA_IA-MDS_CT2000_UM_SC_20250522) P247
Series: DPD-K, MP300
Overvoltage during constant-speed operation
AC motor drive
Meaning: During constant-speed operation, the AC motor drive detects overvoltage on the internal high-voltage DC side. When ovn occurs, the AC motor drive output is immediately disabled, the motor coasts, and the panel displays the ovn error.
Possible causes
- Rapid load change
- 1. Connect a braking resistor, braking resistor unit, or common DC bus to the AC motor drive.
- Check whether the stall prevention action level setting is less than
- No-load current
- The stall prevention action level setting should be greater than the no-load current.
- Motor inertia voltage rise
- Supply voltage too high
- A power factor correction capacitor is being switched within the same power supply system.
- Action
- If a power factor correction capacitor or an active power supply device operates within the same power supply system, the input voltage may briefly rise abnormally and sharply. Install a AC reactor.
Source: DPD-K Series User Manual (DPD-K user manual_20211224) P316; MPD_MP300 Series User Manual (DELTA_IA-MDS_MPD_UM_SC_20260326) P144
Series: HES-C
Overvoltage at constant speed
hydraulic servo drive
Meaning:
Possible causes
Source: HES-C Technical Manual (DELTA_IA-MDS_VFD-HES_UM_TC_20250715) P100
Series: MS300
Overvoltage during constant-speed operation
AC motor drive
Meaning: During constant-speed operation, the AC motor drive detects overvoltage on the internal high-voltage DC side. When ovn occurs, the AC motor drive output is immediately shut off, the motor coasts, and the panel displays the ovn error.
Possible causes
- Rapid load change
- 1.
- Connect a braking resistor, braking resistor unit, or common DC bus to the AC motor drive.
- 2.
- 3.
- 4.
- Check whether the stall prevention action level setting is less than
- No-load current
- The stall prevention action level setting should be greater than the no-load current.
- Motor inertia voltage rise
- Supply voltage too high
Source: MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P246
Series: MS300-HS, VFD-DD, VFD-VL
Overvoltage at constant speed
AC motor drive
Meaning:
Possible causes
Source: MS300 (high-speed model) (DELTA_IA-MDS_VFD MS300_high_UM_TC_20170306) P141; VFD-DD (Ver. F, S, T & V ) (DELTA_IA-MDS_VFD-DD_UM_TC_20170609) P35; Delta VFD-VL Manual P61
Series: MX300
Overvoltage during constant-speed operation
AC motor drive
Meaning: During constant speed operation, the AC motor drive detects overvoltage on the internal high-voltage DC side. When ovn occurs, the AC motor drive output is immediately disabled, the motor coasts, and the panel displays the ovn error.
Possible causes
- Rapid load change
- 1. Connect a braking resistor, a braking resistor unit, or a common DC bus to the AC motor drive.
- Check whether the stall prevention action condition setting is less than
- No-load current
- The stall prevention action condition setting should be greater than the no-load current.
- Motor inertia voltage rise
- Supply voltage too high
Source: MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P137
Series: REG2000
Overvoltage during regeneration
regenerative unit
Meaning:
Possible causes
Source: REG2000 Series User Manual (DELTA_IA-MDS_REG2000_UM_SC_20251117) P92
Series: VFD-ED
Overvoltage during constant-speed operation
AC motor drive
Meaning:
Possible causes
Source: VFD-ED Series User Manual (DELTA_IA-MDS_VFD-ED_UM_SC_20170315) P125