Hardware Overcurrent
Allen-Bradley · PowerFlex 4M Adjustable Frequency AC Drive
What does F12 mean?
This critical fault signifies that the instantaneous output current from the drive has surpassed a predefined hardware current limit, indicating a severe and immediate overcurrent condition. This can be caused by a short circuit in the motor or motor wiring, an extremely sudden and heavy mechanical load, incorrect motor parameters, or excessive DC braking. This fault is a protective measure to prevent damage to the drive's internal power devices. Unresolved, it poses a risk of catastrophic drive failure.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Review drive programming parameters related to motor control, such as A453 [Boost Select] and DC braking voltage settings, ensuring they are appropriate for the application.
- 4
Temporarily disconnect the motor and perform a no-load test on the drive if possible to rule out motor or wiring issues.