ABB A791 fault code meaning
ABB / A791
Series: ACH531, ACQ531, ACS880
Braking resistor
drive
Meaning: The braking resistor is damaged or not connected.
Possible causes
Source: ACH531 Firmware Manual P130; ACQ531 Firmware Manual P111; ACS880 Basic Control Program Firmware Manual P458
Series: ACH580
Braking resistor
drive
Meaning: The holding brake resistor is damaged or not connected.
Possible causes
Source: ACH580 HVAC Control Program Firmware Manual P280
Series: ACM510-S, ACP510, ACS280, ACS380, ACS530, ACS880-M04, ACS880-POS, ACS880-WINCH
Braking resistor
drive
Meaning: The braking resistor is damaged or not connected.
Possible causes
Source: ACM510-01S_04S Drive Firmware Manual P358; ACP510 Standard Control Program Firmware Manual P358; ACS280 Firmware Manual P334; ACS380 Machinery Control Program Firmware Manual P430; ACS530 Firmware Manual P263; ACS880-M04 Machinery Control Program Firmware Manual P420; ACS880 Position Control Program P446; ACS880 Winch Control Program P552
Series: ACS180
Braking resistor
drive
Meaning: The braking resistor is damaged or not connected.
Possible causes
Source: ACS180 Machinery Control Program Firmware Manual P316