ABB A3C2 fault code meaning
ABB / A3C2
Series: ACH531, ACQ531
BU voltage difference
drive
Meaning: Informational warning from the main voltage branch device difference check.
Possible causes
Source: ACH531 Firmware Manual P126; ACQ531 Firmware Manual P108
Series: ACS530
BU voltage difference
drive
Meaning: Branch unit mains voltage difference detection warning.
Possible causes
Source: ACS530 Firmware Manual P260