InverterFR-F800Verification pending — cross-check with the official manual
FR-F800 E.OV3 — Regenerative overvoltage trip during deceleration or stop
Trip — immediate stop
CAUSE
Why does it occur?
- If regenerative power causes the inverter's internal main circuit DC voltage to reach or exceed the specified value, the protection circuit is activated to stop the inverter output
- The circuit may also be activated by a surge voltage produced in the power supply system. Check for sudden speed reduction. Check if the stall prevention operation is frequently activated in an application with a l
REMEDY · Step by step
How to fix it?
- Set the deceleration time longer. (Set the deceleration time which matches the moment of inertia of the load.) Make the brake cycle longer. Use the regeneration avoidance function (Pr
- 882 to Pr
- 886). (Refer to page 5-540.) Use the brake unit or power regeneration common converter (FR-CV) as required. Set Pr
- 154 "Voltage reduction selection during stall prevention operation" = "10, 11"
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.