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ErrorLib — Industrial Fault Code Library

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20

Torque Prove Speed Band

Allen-Bradley · PowerFlex 700

What does 20 mean?

The difference between the [Commanded Speed] and [Encoder Speed] has exceeded the level set in [Spd Dev Band] for a time period greater than [Spd Band Integrat]. This indicates that the motor is not following the speed command accurately, likely due to a mechanical issue or encoder problem.

Common Causes

  • Actual motor speed deviates significantly from the commanded speed band.
  • Encoder feedback inaccurate or missing.
  • Controller unable to maintain target speed.
  • Excessive mechanical load causing speed drop.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wiring between the drive and the motor for loose connections or damage.

  2. 2

    Check for proper release and operation of the mechanical brake.

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