Brake resistor power limit
Danfoss · VLT HVAC Drive High Power
What does 26 mean?
This warning/alarm indicates that the average power dissipated by the brake resistor over the last 120 seconds has exceeded 90% of its rated capacity. The calculation is based on the DC-link voltage and the brake resistor value set in parameter 2-16 (AC brake Max. Current). If parameter 2-13 (Brake Power Monitoring) is configured for [2] Trip, the drive will fault and stop when the dissipation reaches 100%, signifying continuous excessive braking and potential overheating of the resistor.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Consider installing a brake resistor with a higher power rating or a larger duty cycle if the application genuinely demands frequent or heavy braking.
- 4
Check the DC-link voltage during braking events to ensure it is within expected operational limits and not contributing to excessive power dissipation.