F6

Motor Stalled

Allen-Bradley · PowerFlex 4 Adjustable Frequency

What does F6 mean?

A motor stalled fault occurs when the motor's speed drops significantly while the drive is commanding output, indicating an excessive mechanical load. This causes the drive's output current to exceed the limit set by parameter A089 [Current Limit].

Common Causes

  • Motor is not rotating despite a run command.
  • Excessive motor torque demand without movement.
  • Motor shaft jammed or obstructed.
  • Starting torque insufficient for the load.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reduce the mechanical load applied to the motor to allow it to accelerate or run freely.

  2. 2

    Increase parameter P039 [Accel Time1] or A067 [Accel Time2] to provide more time for the motor to accelerate and reduce peak current demand.

  3. 3

    Verify parameter A089 [Current Limit] is set appropriately for the motor and application, ensuring it does not exceed the drive's capacity (DriveAmps * 1.8).

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley PowerFlex 4 Adjustable Frequency