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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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

2. 4

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