the circuit for preventing outdoor people from press the button in chaos

Published:2011/7/5 11:08:00 Author:John | Keyword: outdoor people, button | From:SeekIC

The circuit shown in the figure is for electric control systems of lifting loading and unloading machinery. It is reversible to run two motors. During the operating process, the circuit breaker QF is connected. Hold down the selected button on the left hand (for example, ST2). Thus, the corresponding AC contactor suctions. Afterwards, the starting button ST1 is turned on with the right hand. Besides, these two buttons are pressed to start the motor. The outsiders do not know that the motor can not be turned up only by conventional press on the button with one hand.



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