ABB FA90 fault code meaning
ABB / FA90
Series: ACS530
STO Diagnostics
drive
Meaning: STO Software section CRC is damaged.
Possible causes
Source: ACS530 Firmware Manual P280
Series: ACS580MV
STO diagnostic failure
drive
Meaning: This fault is triggered by internal program diagnostics.
Possible causes
Source: ACS580MV Firmware Manual P344