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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.

OSF

MAINS OVERVOLTAGE

Schindler · Altivar 312 Drive

What does OSF mean?

This fault indicates that the incoming line voltage supply to the drive is too high or disturbed. Operating the drive with excessive input voltage can damage internal components.

Common Causes

  • Line supply voltage is consistently above the drive's rated input voltage.
  • Transient voltage disturbances or spikes on the line supply.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the incoming line voltage at the drive's power input terminals and verify it is within the specified operating range.

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 108)Search more codes in this manual