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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.

34

CAN bus communication

Vacon · 100 FLOW Application Guide

What does 34 mean?

A message sent on the CAN bus was not acknowledged, indicating a communication issue. This could be due to an inactive device on the bus or a mismatch in configuration.

Common Causes

  • Brake chopper resistor temperature too high.
  • Brake chopper circuit fault detected.
  • Excessive braking energy causing overload on the chopper.
  • Supervision of brake chopper capacitor bank failure.
  • Faulty brake chopper activation signal.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure that there is another active device on the CAN bus.

  2. 2

    Verify that the other device on the bus has the same CAN bus configuration.

Browse all codes in this manual (73)
Verified technical data. Last updated: April 2026

Related Faults

1Overcurrent10Input Phase Fault101PID Feedback Supervision Fault (PID1)
Source: Vacon 100 FLOW Application Guide
Open Manual (Page 108)Search more codes in this manual