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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.

81

Start condition/output open

SEW Eurodrive · MOVIFIT-FC Inverter

What does 81 mean?

This fault indicates an issue with the start condition, specifically relevant in hoist operation mode, or an open circuit in the output. It could be due to a phase failure in the motor lead preventing proper startup or operation.

Common Causes

  • Start command sent but output contact failed to close.
  • Feedback signal from output contact is missing or incorrect.
  • Wiring issue preventing output contact closure.
  • Mechanical obstruction of the output contact.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the motor lead for phase failure.

  2. 2

    Reset the fault by switching off the DC 24 V supply voltage.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

Related Faults

01Overcurrent in output stage04Thermal overload of motor / Overcurrent in brake chopper06Phase failure
Source: SEW Eurodrive MOVIFIT-FC Inverter
Open Manual (Page 127)Search more codes in this manual