Delta ACE fault code meaning
Delta / ACE
Series: C2000 Plus, MH300, MS300
ACI open
AC motor drive
Meaning: Analog current input open (including all analog 4~20 mA signals)
Possible causes
- ACI Loose or open wiring.
- Retighten the terminals.
- External device fault
- Hardware fault
Source: C2000 Plus Series User Manual (DELTA_IA-MDS_C2000 Plus_UM_TC_20250522) P421; MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P293; MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P246
Series: C2000-R
ACI open
AC motor drive
Meaning:
Possible causes
Source: C2000-R User Manual P218
Series: CFP2000, CH2000, CP2000, DPD-K, MH300-HS
ACI open
AC motor drive
Meaning: Analog current input open circuit (including all analog 4~20 mA signals)
Possible causes
- ACI Loose or open wiring.
- Retighten the terminals.
- External device fault
- Hardware fault
Source: CFP2000 Series User Manual (DELTA_IA-MDS_CFP2000_UM_SC_20250731) P284; CH2000 Series User Manual (DELTA_IA-MDS_CH2000_UM_SC_20251030) P382; CP2000 Series User Manual (DELTA_IA-MDS_CP2000_UM_SC_20250704) P392; DPD-K Series User Manual (DPD-K user manual_20211224) P316; MH300 Series (High-Speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P252
Series: CT2000, VFD-VE, VFD-VL
Analog current input open
AC motor drive
Meaning:
Possible causes
Source: CT2000 Series User Manual (DELTA_IA-MDS_CT2000_UM_SC_20250522) P247; Delta VFD-VE Manual P66; Delta VFD-VL Manual P62
Series: ME300
ACI open
AC motor drive
Meaning: Analog current input open circuit (including all analog 4~20mA signals)
Possible causes
- ACI Loose or open wiring.
- Retighten the terminals.
- External device fault
- Hardware fault
Source: ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P180
Series: MP300
ACI open
AC motor drive
Meaning: Analog current input open (including all analog 4~20mA signals).
Possible causes
- ACI Loose or open wiring.
- Retighten the terminals.
- External device fault
- Hardware fault
Source: MPD_MP300 Series User Manual (DELTA_IA-MDS_MPD_UM_SC_20260326) P145
Series: MS300-HS
Analog current input open
AC motor drive
Meaning:
Possible causes
Source: MS300 (High-speed Models) (DELTA_IA-MDS_VFD MS300_high_UM_TC_20170306) P141
Series: MX300
AI2 open
AC motor drive
Meaning: Analog current input open (including all analog 4~20mA signals)
Possible causes
- Loose or open wiring
- Retighten the terminals
- External device fault
- Hardware fault
- 8-75
Source: MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P138
Series: VP3000
AI1 open
AC motor drive
Meaning: Analog current input open (including all analog 4~20 mA signals)
Possible causes
- AI1 wiring is loose or open
- Retighten the terminals.
- External device fault
- Hardware fault
Source: VP3000 Series User Manual (DELTA_IA-MDS_VP3000_UM_TC_20250523) P437
Series: VP3000-E
AI1 open
AC motor drive
Meaning: Analog current input open circuit (including all analog 4~20 mA signals)
Possible causes
- AI1 wiring is loose or open
- Retighten the terminals.
- External device fault
- Hardware fault
Source: VP3000-E & VP3000-EHS User Manual (DELTA_IA-MDS_VP3000-E-VP3000-EHS_UM_SC_20260306) P402