Stall Prevention Trip

What does E.OLT mean?

This fault occurs when the inverter's output frequency drops to 1Hz due to stall prevention operation and remains at that level for 3 seconds, ultimately leading to an inverter trip. The display shows "OL" during active stall prevention. This indicates that the motor is experiencing a continuous overload condition that the stall prevention function cannot overcome. Sustained overload can lead to motor and inverter damage.

Complete Troubleshooting Guide

1. 1

   Reduce the mechanical load on the motor; check the driven equipment for binding, excessive friction, or increased weight.

2. 2

   Check the motor itself for any internal issues (e.g., bearing problems, winding damage) that could increase its current draw under load.

3. 3

   Review the Pr. 22 (Stall prevention operation level) setting; adjust it if necessary, but be cautious not to set it too high, which could allow sustained overload.

4. 4

   Consider upsizing the motor or inverter if the load conditions are consistently at the limit of the current setup.