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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.

SOF

OVERSPEED

Schindler · Altivar 312 Drive

What does SOF mean?

This overspeed fault indicates that the motor speed has exceeded its commanded or permissible limits. This typically results from system instability or an excessively high driving load, which can lead to loss of control.

Common Causes

  • Instability or driving load too high

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the motor, gain and stability parameters.

  2. 2

    Add a braking resistor.

  3. 3

    Check the size of the motor/drive/load.

Browse all codes in this manual (32)
Verified technical data. Last updated: April 2026

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Source: Schindler Altivar 312 Drive
Open Manual (Page 107)Search more codes in this manual