F2
Auxiliary Input
Allen-Bradley · PowerFlex 4 Adjustable Frequency AC Drive
What does F2 mean?
This fault indicates an issue with the auxiliary input signal. This input is typically configured via parameter A051 or A052 (Digital In1 Sel/Digital In2 Sel) with option 3 ('Aux Fault'). It signals an abnormal condition detected by the auxiliary input circuit.
Source: Allen-Bradley PowerFlex 4 Adjustable Frequency AC Drive
Open Manual (Page 15)