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.

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Verified technical data. Last updated: March 2026

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Source: SEW Eurodrive MOVIFIT-FC Inverter