Delta EF1 fault code meaning

Delta / EF1

Series: AFE3000

External terminal error 1

active front end

Meaning: When the contact status of the MI function terminal assigned to the EF1 function is ON, output stops immediately and EF1 is displayed on the digital operator.

Possible causes

Source: AFE3000 Series User Manual (DELTA_IA-PQ_AFE3000_UM_TC_20260330) P133

Series: C2000 Plus

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the MI function terminal assigned to function EF1 is ON, output stops immediately and the digital operator displays EF1. The motor coasts.

Possible causes

Source: C2000 Plus Series User Manual (DELTA_IA-MDS_C2000 Plus_UM_TC_20250522) P421

Series: C2000-R, CT2000, MS300-HS, VFD-B, VFD-ED, VFD-VE, VFD-VL

Emergency stop

AC motor drive

Meaning:

Possible causes

Source: C2000-R User Manual P202; CT2000 Series User Manual (DELTA_IA-MDS_CT2000_UM_SC_20250522) P248; MS300 (High-Speed Models) (DELTA_IA-MDS_VFD MS300_high_UM_TC_20170306) P141; Delta VFD-B Instruction Manual P2; VFD-ED Series User Manual (DELTA_IA-MDS_VFD-ED_UM_SC_20170315) P153; Delta VFD-VE Instruction Manual P66; Delta VFD-VL Instruction Manual P62

Series: CFP2000

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the MI function terminal assigned to function EF1 is ON, output stops immediately and the digital operator displays EF1. The motor coasts.

Possible causes

Source: CFP2000 Series User Manual (DELTA_IA-MDS_CFP2000_UM_SC_20250731) P284

Series: CH2000, CP2000, DPD-K

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the MI function terminal assigned to function EF1 is ON, output stops immediately and the digital operator displays EF1. The motor coasts.

Possible causes

Source: 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) P317

Series: ME300

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the function terminal with MI = EF1 is (ON), output stops immediately and EF1 is displayed on the digital operator. The motor coasts.

Possible causes

Source: ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P180

Series: MH300

Emergency stop via external terminal

AC motor drive

Meaning: When the contact state of the function terminal configured as MI = EF1 is ON, output stops immediately and EF1 is displayed on the digital operator. The motor coasts.

Possible causes

Source: MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P293

Series: MH300-HS

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the terminal assigned to function MI = EF1 is ON, output stops immediately and EF1 is displayed on the digital operator. The motor coasts.

Possible causes

Source: MH300 Series (High-speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P241

Series: MS300

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status of the MI function terminal assigned to the EF1 function is ON, output stops immediately, EF1 appears on the digital operator, and the motor coasts.

Possible causes

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

Series: MX300

Emergency stop via external terminal

AC motor drive

Meaning: When the contact status (ON) of the function terminal with MI = EF1 is met: immediately stop the output and display EF1 on the digital operator. Coasting is in progress.

Possible causes

Source: MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P138

Series: VFD-BP, VFD-BW, VFD-F, VFD-FE

External emergency stop

AC motor drive

Meaning:

Possible causes

Source: Delta VFD-BP Manual P51; Delta VFD-BW Manual P72; Delta VFD-F Manual P1; Delta VFD-FE Manual P41

Series: VP3000

Emergency stop

AC motor drive

Meaning: When the MI function terminal is assigned to the emergency stop function and its contact status is ON, output stops immediately and EF1 is displayed on the digital operator. The motor coasts.

Possible causes

Source: VP3000 Series User Manual (DELTA_IA-MDS_VP3000_UM_TC_20250523) P437

Series: VP3000-E

Emergency stop

AC motor drive

Meaning: When the contact status of the MI multifunction terminal assigned to the emergency stop function is ON, output stops immediately and the digital operator displays EF1. The motor coasts.

Possible causes

Source: VP3000-E & VP3000-EHS User Manual (DELTA_IA-MDS_VP3000-E-VP3000-EHS_UM_SC_20260306) P402