InverterFR-F800Verification pending — cross-check with the official manual
FR-F800 E.OLT — Stall prevention STP
Trip — immediate stop
CAUSE
Why does it occur?
- If the output frequency has fallen to 0.5 Hz by stall prevention operation and remains for 3 s, a fault (E.OLT) appears and the inverter trips
- OL appears while stall prevention is being activated
- During speed control, a fault (E.OLT) appears and the inverter trips if the frequency value converted from the motor rotation speed drops to 1.5 Hz or lower by stall prevention operation and the output
REMEDY · Step by step
How to fix it?
- Reduce the load. Change the Pr
- 22, and Pr
- 874 values. (Check the Pr
- 22 setting under V/F control and Advanced magnetic flux vector control.) For a test run without connecting a motor, select the PM motor control test operation. (Refer to page 5-39.) Also check that the stall prevention (overcurrent) warning (OL) or the stall prevention (overvoltage) warning (oL) countermeasure is taken
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.