Stall

The Stall function detects high current intensity, typically associated with a locked or stalled motor, while in the Start state.

If enabled, this protection function triggers a Stall trip when the motor is in the Start state, and the maximum phase current exceeds the specified Stall Trip Level for a time longer than the specified Stall Trip Delay.

NOTE: No Stall detection alarm is associated with this function.

Stall and Trip

I1	Phase 1 Current	I2	Phase 2 Current
I3	Phase 3 Current	A	Imax
B	Imax ≥ Stall Trip Level	C	Start State
D	Stall Trip	T	Stall Trip Delay

This function is typically enabled in addition to the Long Start protection function, setting a higher acceptable current intensity level and a shorter trip delay.

Stall Trip Versus Long Start Trip

D	Stall Trip	E	Stall Level
F	Long Start Trip Level	G	Long Start Trip Delay
I	Current	Ir	Rated Current
t	Time	T	Stall Trip Delay

NOTE: In this illustration, the Stall protection function triggers a trip—while the Long Start protection function does not (because the Long Start Trip Delay has not elapsed yet).