Brake check failed

What does 28 mean?

This warning/alarm indicates that a brake check procedure has failed, suggesting that the brake resistor is either not connected to the frequency converter or is not functioning correctly. This condition prevents the drive from effectively controlling the mechanical brake, which can be critical for safety and operational integrity in certain applications.

Complete Troubleshooting Guide

1. 1

   Verify that parameter 2-15 (Brake Check) is configured correctly and that the brake check function is enabled and appropriately set up.

2. 2

   Physically inspect all wiring and connections between the frequency converter and the brake resistor to ensure they are secure and intact.

3. 3

   Measure the resistance of the brake resistor directly to confirm its integrity and that its value falls within the manufacturer's specifications.

4. 4

   Check for any loose terminals or damaged wiring that could interrupt the circuit to the brake resistor.