F108-91

Internal CPU fault

SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive

What does F108-91 mean?

An internal fault has been detected within the CPU of the DCS..B option. This indicates a critical hardware or firmware issue with the processing unit.

Common Causes

  • CPU internal error detected by self-test routines.
  • Persistent stack overflow in CPU operations.
  • Data corruption within CPU registers.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace DCS..B option.

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Verified technical data. Last updated: March 2026

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Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
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