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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.

FF51

LINE CONV

ABB · ACS800 Standard Firmware

What does FF51 mean?

A fault has been detected on the line side converter. Specific details regarding this fault are typically documented in the dedicated line side converter manual.

Common Causes

  • Error related to the line converter or AC input stage.
  • Incorrect input voltage or frequency.
  • Faulty components in the AC-DC conversion circuit.
  • Power quality issues on the supply line.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Shift the control panel from the motor side converter control board to the line side converter control board to access its specific status.

  2. 2

    Refer to the line side converter manual for a detailed description of the active fault and troubleshooting procedures.

Browse all codes in this manual (33)
Verified technical data. Last updated: April 2026

Related Faults

2211Current Measurement Failure2330Earth Fault / Current Unbalance3210DC OVERVOLT
Source: ABB ACS800 Standard Firmware
Open Manual (Page 244)Search more codes in this manual