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ErrorLib — Industrial Fault Code Library

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3

Power Loss

Allen-Bradley · PowerFlex 700

What does 3 mean?

The DC bus voltage remained below 85% of nominal for longer than the configured [Power Loss Time]. This indicates a sustained sag or interruption of the incoming AC line power. This fault can be enabled/disabled with [Fault Config 1].

Common Causes

  • Loss of primary power supply to the industrial equipment.
  • Internal power supply unit failure.
  • Tripped circuit breaker or blown fuse.
  • Interruption of power during operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Monitor the incoming AC line for low voltage conditions or power interruptions.

Browse all codes in this manual (49)
Verified technical data. Last updated: April 2026

Related Faults

100Parameter Checksum Error101UserSet1 Chksum102UserSet2 Chksum
Source: Allen-Bradley PowerFlex 700
Open Manual (Page 88)Search more codes in this manual