Cause : Stall prevention (overvoltage) comes when the output voltage of the inverter increases, the stall prevention (overvoltage) function activates. The regeneration avoidance function activates due to excessive regenerative power of the motor.

The following section explains the stall prevention (overvoltage) function:

1. During deceleration: If the regenerative power of the motor becomes excessive to exceed the regenerativ power consumption capability, this function stops decreasing the frequency to prevent overvoltage trip. As soon as the regenerative power has reduced, deceleration resumes.

2. Check for sudden speed reduction.

3. Check if the regeneration avoidance function (Pr.882 to Pr.886) is being used.

4. The deceleration time may change. Increase the deceleration time using Pr.8 Deceleration time.