Delta b4GFF fault code meaning

Delta / b4GFF

Series: ME300, MH300-HS, MH300, MS300, MX300

Ground fault detected before operation

AC motor drive

Meaning: A ground fault is detected during output wiring detection before the AC motor drive starts running

Possible causes

Motor wiring error
Check whether faulty insulation in the motor wiring causes the output
Short circuit

Source: ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P181; MH300 Series (High-Speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P253; MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P294; MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P247; MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P139

Series: MP300

Ground fault detected before operation

AC motor drive

Meaning: A ground fault is detected during the output wiring check before the AC motor drive starts running.

Possible causes

Motor wiring error
Check whether faulty insulation in the motor wiring causes the output
Short circuit

Source: MPD_MP300 Series User Manual (DELTA_IA-MDS_MPD_UM_SC_20260326) P145

Series: MS300-HS

GFF ground fault before start

AC motor drive

Meaning:

Possible causes

Source: MS300 (High-speed model) (DELTA_IA-MDS_VFD MS300_high_UM_TC_20170306) P142