Hello guys,
I'm studing one control circuit diagram and need your help. It's star-delta changeover control circuit and I need one clarification. I know how this circuit works. K1T is special electronic timer that has adjustable starting time and fixed transition time (about 50 ms) for the transition between astar and delta contactor connection. I'm not 100% sure about right K1 contact (13-14) and don't know why is important to be in paralel with K2 contact (13-14). One explanation is that "I" contact (start contact 13-14) is just push button (momentary), and in order to energize K2, K1 NO (13-14 is needed), because, K1 is energized when "I" is pressed, and after "I" is released, K2 is energized through K1 NO (13-14). I wonder if that is real explanation, because, when "I" is pressed, almost immediately K1 is energized, and K2 can be energized through path (K2 NC 21-22, K1 NO 43-44, K1T) before operater release start button ("I"), since this action performs very quickly. When K2 is energized, K2 NO (13-14) is closed and thus coil K2 remain energized through its 13-14 contact.
Please can you give me more information?
I hope you understand my dilemma.
Thanks.
I'm studing one control circuit diagram and need your help. It's star-delta changeover control circuit and I need one clarification. I know how this circuit works. K1T is special electronic timer that has adjustable starting time and fixed transition time (about 50 ms) for the transition between astar and delta contactor connection. I'm not 100% sure about right K1 contact (13-14) and don't know why is important to be in paralel with K2 contact (13-14). One explanation is that "I" contact (start contact 13-14) is just push button (momentary), and in order to energize K2, K1 NO (13-14 is needed), because, K1 is energized when "I" is pressed, and after "I" is released, K2 is energized through K1 NO (13-14). I wonder if that is real explanation, because, when "I" is pressed, almost immediately K1 is energized, and K2 can be energized through path (K2 NC 21-22, K1 NO 43-44, K1T) before operater release start button ("I"), since this action performs very quickly. When K2 is energized, K2 NO (13-14) is closed and thus coil K2 remain energized through its 13-14 contact.
Please can you give me more information?
I hope you understand my dilemma.
Thanks.