When PB-ON is pressed, then K1, T1, and K3 will be ON. K1-NOcontact function sebagaipengunci so K1, T1, and K3 will remainON even though the PB-ON has been removed. At this time the motor running with STAR configuration.
Furthermore, the T1 will count up timer count value reaches the target. When T1 reaches the target T1-NO output contact will be ON. Thus, K3 K2 will be OFF and ON, and the motor running with the configuration of DELTA.
Contact K2-K3-NC and NC function as interlock which ensuresthat the star contactor and delta contactor active in turn.
The duration of practical on-delay timer approximately between 3-5 seconds. But To be more precise, you can find out moreabout the series of Star-Delta, because there are still manydetails that are not discussed in this paper that only give an example circuit and it works just a little bit of principle.
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