Description
主电路中KM三个常开主触头闭合,电动机M就起动运行。随着水泵的工作,水塔中水位逐渐上升,浮球上升又使撞块向下离开行程开关SQ2,行程开关一旦不受压就会复位,从而使SQ2常开触头断开,如果控制电路只受SQ2常开触头的控制
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