RB

Regenerative brake pre-alarm

Mitsubishi Electric · Mitsubishi FR-E800 Variable Frequency Drive

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%.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

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

Source: Mitsubishi FR-E800 Variable Frequency Drive
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