Two contactors - one for each winding set. Essentially two 175hp motors. Energize first contactor - motor comes part way up to speed. Energize second contactor - motor accelerates two running speed. Supposedly cuts down the inrush current and voltage drop - and it should some.
I've only dealt with one in my career. If I get a choice, that will be enough
Why does the motor only come part way up to speed with the one winding set energized? Is this because the one winding only produces half of the torque and therefore the the load will have a slip where the reduced torque intersects the motor torque?
Why will there be less current during starting with only 1 winding set? Something to do with the reduced flux with only 1 winding?