In this tutorial we will show the star delta y δ 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. R y b red yellow blue 3 phase linescb general circuit breakermain mai supplyy starδ deltac1 c2 c3 contatcors power diagramol over load relayno normally opennc normally closed k1 contactor contactor coil k1no contactor holding coil.
Star Delta Why Amp How
Automatic star delta starter control circuit diagram with timer. Next the circuit goes through the nc terminals of the thermal over load relay. The star contactor becomes energized and t he timer coil gets supply at the same time. As you see in the above star delta starter diagram first an nc push button switch is connected to stop the operation. Star delta starter control circuit diagram is today topic. A simple circuit diagram of contactor with three phase motor. Its not 100 accurate but at lease we can get the approximate time for change over timer of star delta starternormally the base line for timer setting is around 10 until 20 second.
In the above star delta starter control circuit wiring diagram with timer and normally close push buttonnormally open push button switch. Power control wiring diagram of star delta starter. The star contactor coil gets supply through phase r off push button on push button t nc star contactor coil d1 nc of delta coil phase y. Here you can see the control circuit diagram of automatic star delta starter. Automatic star delta starter design normally consists of three contactors an overload relay or circuit breaker and a timer for setting the time in the star position starting. In this post you will learn complete star delta starter wiring with timer normally open push button switch and normally close push button switch.
A 8 pin timer are used. The control circuit consists of push button switches auxiliary contacts and a timer. Control circuit of star delta starter open transition. For star delta 3 phase motor automatic starter with timer r y b red yellow blue 3 phase lines cb general circuit breaker main mai supply y star δ delta 1a timer c1 c2 c3 contatcors for power control diagram ol over load relay no normally open. In control wiring diagram all magnetic contactors coils are rated 220 vac. In my last post i share a star delta starter wiring diagram 3 phase motor connection.
The on delay timer diagram is also shown in the diagram. 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. Star delta starter without timer for 3 phase induction motor. As soon as the star contactor on its auxiliary contact s1 becomes nc and s2 becomes no. This equipmentappliance reduces starting current and starting torque. These two method that id explained above is a basic measurement technique that we can use to determine the approximate time for change over of star delta starter.
Gallery of Automatic Star Delta Starter Control Circuit Diagram With Timer
