Controlling the interchanging star connection and delta connection of an ac induction motor is achieved by means of a star delta or wye delta control circuit the control circuit consists of push button switches auxiliary contacts and a timer control circuit of star delta starter open transition. Wye delta and solid state starters figure 5 sample wye delta connection diagram as noted in figure 4 a for connecting the motor for full voltage leads 1 and 6 are connected together forming t1 and are connected to l1 correspondingly leads 3 5 and 2 4 ar e connected together forming t3 and t2 respectively when. Star delta connection diagram and working principle descriptions a dual starter connects the motor terminals directly to the power supply hence the motor is subjected to the full voltage of the power supply consequently high starting current flows through the motor this type of starting is. In this tutorial we will show the star delta y 3 phase induction ac motor starting method by automatic star delta starter with timer with schematic power control and wiring diagram as well as how star delta starter works and their applications with advantages and disadvantages
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