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F109-146

Voltage supply of encoder faulty (E3405 = encoder 1 and E3406 = encoder 2)

SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive

What does F109-146 mean?

The voltage supply of the encoder (E3405 or E3406) is not within the defined range (min. DC 20 V / max. DC 29 V). This may be due to an overload, causing the internal polyswitch fuse to trip.

Common Causes

  • Voltage supply to encoder 1 (E3405) or encoder 2 (E3406) is out of operating specifications.
  • Faulty power wiring to the encoders.
  • Defective internal voltage regulator supplying the encoders.
  • Intermittent voltage drop affecting encoder operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check supply voltage of DCS..B option.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
Open Manual (Page 217)Search more codes in this manual