F2
Auxiliary Input
Allen-Bradley · PowerFlex 4 Adjustable Frequency
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.
Common Causes
- Auxiliary input signal status is unexpected or faulty.
- External auxiliary device signaling an error.
- Auxiliary control signal not received.
- Fault detected on an auxiliary control channel.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify all conductors connected to the digital input terminal(s) configured for 'Aux Fault' (P-A051 or P-A052, option 3) are securely terminated and free from damage.
- 2
Check the state of the external device connected to the auxiliary input terminal to ensure it is functioning correctly and providing the expected signal.
Verified technical data. Last updated: March 2026
Related Faults
Source: Allen-Bradley PowerFlex 4 Adjustable Frequency