Regenerative brake pre-alarm

What does RB mean?

This pre-alarm appears if the regenerative brake duty reaches or exceeds 85% of the value set in Pr.70 (Special regenerative brake duty). It's a warning that the regenerative braking capacity is nearing its limit, and a regenerative overvoltage (E.OV[]) fault may occur if it reaches 100%.

Complete Troubleshooting Guide

1. 1

   Set the deceleration time longer to reduce the instantaneous regenerative energy and duty.

2. 2

   Check the brake resistor duty to ensure it is not too high for the application, possibly requiring a larger resistor.

3. 3

   Verify the settings of Pr.30 (Regenerative function selection) and Pr.70 (Special regenerative brake duty).