InverterFR-A800Verification pending — cross-check with the official manual
FR-A800 RB — Regenerative brake pre-alarm (Standard models only)
Alarm — operational, inspection needed
CAUSE
Why does it occur?
- Appears if 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 functio
REMEDY · Step by step
How to fix it?
• Set the deceleration time longer. • Check the Pr.30 and Pr.70 settings. (Refer to page 743.)
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Mitsubishi Electric manual. For accurate and complete information, always consult the official manual.
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