Found this online, don't know if it will help or not.
The wye-delta is a full-voltage starter that requires a 6-lead motor and contactors that allow the motor winding to be connected in wye configuration during acceleration. Wye-connected motor windings experience phase voltage rather than full-line voltage. Efficiency is good; inrush current and initial torque is reduced; but switching to full line is not a smooth transition.
Last edited by Kuhn86; 09/21/15 09:23 PM.
