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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.

55

Wrong run fault (FWD/REV conflict)

Vacon · 20 Compact

What does 55 mean?

This fault occurs when both the run forward and run backward commands are simultaneously active (high) via the digital input signals. This is a conflicting command input that prevents proper motor operation.

Common Causes

  • Emergency stop button has been activated.
  • External safety device has triggered an emergency stop.
  • Internal safety circuit condition requires an emergency stop.
  • Emergency stop signal is continuously active.
  • Fault in the wiring of the emergency stop circuit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the I/O control signals (e.g., DI1 for Start forward, DI2 for Start reverse) to ensure that both forward and reverse commands are not active at the same time.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

Related Faults

1Overcurrent11Output phase fault111Temperature fault
Source: Vacon 20 Compact
Open Manual (Page 57)Search more codes in this manual