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ErrorLib — Industrial Fault Code Library

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81

Start condition

SEW Eurodrive · MCBSM

What does 81 mean?

Immediate switch-off with inhibit, specifically in "VFC hoist" operating mode. The motor could not be supplied with the correct current during pre-magnetizing time, possibly due to rated motor power being too small for the inverter or undersized motor cables. This prevents proper motor startup and can stress the inverter.

Common Causes

  • The drive cannot enter a run state due to unmet conditions.
  • Safety interlock circuits not enabled (e.g., P0-26).
  • Required command signal not present (e.g., enable input).
  • Fault or warning status preventing startup.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the connection between the inverter and the motor, ensuring all phases are securely connected.

  2. 2

    Check startup data and perform a new startup if necessary, verifying the rated motor power and other motor parameters.

  3. 3

    Check the cross-section of the motor cable and increase it if necessary to ensure adequate current delivery without excessive voltage drop.

Browse all codes in this manual (50)
Verified technical data. Last updated: April 2026

Related Faults

100Vibration/warning Display error101Oscillation fault102Oil aging/warning Display error
Source: SEW Eurodrive MCBSM
View Official PDFSearch more codes in this manual