Mitsubishi FR-A Series- FR-A800, FR-A770/A701, FR-A700, FR-A800-E, FR-A741 Drive
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Apr 01, 2024 5:04 am
Cause : Regenerative brake pre-alarm comes when the regenerative brake duty reaches or exceeds 85% of the Pr.70 Special regenerative brake duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E. OV[ ]) occurs.
- Check if the brake resistor duty is not too high.
- Check that the Pr.30 Regenerative function selection and Pr.70 settings are correct.
- Set the deceleration time longer.
- Check the Pr.30 and Pr.70 settings.
