AC contactor power saving and silent running circuit 4

Published:2012/11/4 21:23:00 Author:Ecco | Keyword: AC contactor , power saving, silent running | From:SeekIC

The circuit is shown in Figure, it uses Y-△ manually buck starter to realize AC contactor high voltage (380V) start and low-voltage (220V) operation, then it will get the power-saving and silent effect. Pressing the start button ST, 1KM is energized, its normally open contact is closed, 3KM is energized. The 3KM normally closed auxiliary contacts disconnects, the main contacts are closed, then the motor M winding is connected into a Y-shaped connection for the buck start. When the motor speed is up to or near rated speed, pressing the running button STN can make 3KM lose power and release, then 2KM gets electric (380V) and pulls, the motor M is switched to △ pick operation.



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