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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.

InF1

Unknown Drive Rating

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does InF1 mean?

The drive has detected an unknown drive rating. This implies a critical internal inconsistency where the drive cannot identify its own power or voltage characteristics, preventing safe and proper operation. This usually points to an internal hardware issue.

Common Causes

  • The drive's power rating is not recognized or is outside the supported range.
  • Incorrect model number selected in configuration parameters (e.g., P1-01).
  • Incompatible firmware flashed to the drive.
  • Physical damage to the drive's rating identification components.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the drive.

  2. 2

    Perform a factory reset to attempt to restore internal calibration data.

  3. 3

    If the fault persists, it indicates an internal hardware fault, likely requiring replacement of the control board or the entire drive unit.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

ASFAngle ErrorCFFIncorrect ConfigurationCFI2Configuration Transfer Error
Source: Schneider Electric Altivar Machine ATV320 Variable Speed Drive
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