MULTIMODE STARTERS FOR THREE PHASE INDUCTION MOTOR USING MICROCONTROLLER

In this Paper microcontroller based multi mode starter is very interesting one. In this Paper consists of three types of starters. To reduce the starting current we need different types of starters for start the induction Motor. The type of the starter is varied with respect to motor ratings and type of supply voltages. DOL, semi automatic Star-Delta and automatic Star-Delta starters are used for start the three phase induction motors. But these motors are needed separate hard wired control circuits and enclosures. The objective of this Paper is to design a simple, easy to install, microcontroller-based circuit to control the contactors through relays. The control circuit for various types of the starters is programmed in a single microcontroller IC. Relay switches are provide to select the mode of the starter like DOL, semi automatic Star-Delta and automatic Star-Delta starters of the motor. Hardware part contains contactors/relays. These relays are control by microcontroller for different contactor programming of starters. The controller used is a low power, cost efficient chip manufactured by 16F877 having 8K bytes of on-chip flash memory. This Paper provides one electronic circuit for various starters, hence reduce the cost of starter and one starter can operate different starter mode.