F111

Safety Hardware

Allen-Bradley · PowerFlex 520-series Adjustable Frequency AC Drive

What does F111 mean?

A malfunction in the safety input enable hardware has been detected, specifically that one of the required safety inputs (S1 or S2) is not enabled. This indicates a problem within the drive's integrated safety circuit or incorrect external safety wiring, preventing safe operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect wiring to the safety inputs for breaks, loose connections, or damage.

  2. 4

    If the fault persists after verifying inputs and jumpers, replace the control module as the safety hardware may be internally faulty.

Source: Allen-Bradley PowerFlex 520-series Adjustable Frequency AC Drive
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