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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

10028

Encoder not ready to operate

ABB · Application Error ABB Motion Drives Error trouble shoo

What does 10028 mean?

The drive (MotiFlex e100, MotiFlex e180, MicroFlex e190) is configured to use a Serial Encoder but is unable to provide position information. This error is generated if an attempt is made to enable the axis before the encoder is ready (which can take several seconds) or if the resolution configured on the drive is not compatible with the encoder. The axis will be crash stopped and disabled.

Common Causes

  • Attempt to enable the axis before the serial encoder has completed its readiness sequence.
  • The encoder resolution configured on the drive is not compatible with the connected serial encoder.
  • An internal fault within the encoder preventing it from providing valid position information.
  • Wiring issues or poor connections for the serial encoder.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow several seconds for the serial encoder to become ready after power-up before attempting to enable the axis.

  2. 2

    Verify that the encoder resolution configured in the drive's parameters matches the specifications of the connected serial encoder.

  3. 3

    Connect to the drive with Mint Workbench, navigate to "Parameters > Encoder > Channel 0 > Encoder Parameter(Encoder0, Fault Register)", and check for a non-zero value. Consult the help file subject "ENCODERPARAMETER" for specific fault details.

  4. 4

    Inspect all encoder wiring and connections for integrity, proper shielding, and secure termination according to the installation manual.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

-Initialization error (check memory unit insertion)10019Motor temperature trip (_ecMOTOR_TEMP_INPUT)10020Phase search failure (_ecPHASE_SEARCH_FAILED)
Source: Application Error ABB Motion Drives Error trouble shoo
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