Since winding is connected in Star, hence each phase will get √3 times less than the line voltage i.e. Thus C1 Contactor is also energized and Three Phase Supply will reach to the motor. When C3 is energized, its auxiliary open links will be closed and vice versa (i.e. Contactor coil C3 and timer coil (I1) is energized at once and the motor winding then connected in Star.This way, the circuit is completed, as a result Operation & Working of Automatic Star Delta Starterįrom L1 The phase current flows to thermal overload contact through fuse, then OFF push button, On push button Interlocking contact 2, and then C3. Control 3-Phase Motor from more than Two Places – Power & Control Diagrams.STAR/DELTA Starter Without Timer Power, Control Diagrams & Wiring Diagrams.Characteristics & Features of Star-Delta StarterĪutomatic Star Delta Starter with Timer Wiring & Installation Diagram Automatic Star Delta Starter with Timer For Three Phase MotorĮxplanation of the working and operation of Star Delta Automatic Starter with Timer Wiring Installation:įrom the left you have the main contactor with the pneumatic timer because your main contactor is always energized, in the Middle you have the Delta contactor with a thermal overload for motor protection in case the motor exceeds the ampere rating set on the thermal overload, on the right you have the Star contactor which is the first contactor to be energized with the main contactor then when the timer reaches its time limit the Star contactor de-energizes and the Delta contactor energizes and the Motor is running at full load.Advantages & Disadvantages of Star Delta Starter with Timer.Wiring Diagram of Star Delta Starter with Timer.Control Diagram of Star Delta Starter with Timer.
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