ABB 7A9C fault code meaning

ABB / 7A9C

Series: ACH531, ACQ531

FSx STODiagnostic fault

drive

Meaning:

Possible causes

Source: ACH531 Firmware Manual P142; ACQ531 Firmware Manual P124

Series: ACS530

FSx STO Diagnostic fault

drive

Meaning:

Possible causes

Source: ACS530 Firmware Manual P277