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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.

InF3

Internal Serial Link Interruption

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does InF3 mean?

An interruption in the internal serial link communication. This refers to communication between internal sub-components of the drive (e.g., control board and I/O board). This critical internal fault can lead to unpredictable behavior or complete operational failure.

Common Causes

  • Loss of communication over the internal serial link between drive modules.
  • Faulty serial cable or connector between the control and power sections.
  • Electromagnetic interference disrupting serial data transmission.
  • Failure of the serial transceiver on one of the connected modules.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the drive to attempt re-establishment of the internal link.

  2. 2

    Check for any visible damage or loose connections between internal boards and ribbon cables.

  3. 3

    If the fault persists, it suggests an internal hardware issue on one of the boards, possibly requiring replacement.

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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