A16B-1210-0470

A16B-1210-0470 这种线路仅适应于功率在13kW以下△形接法的小容量电动机，否则由于KM2接触器常闭辅助触点接在主电路中，容量小，很易烧损。

十五、用3个接触器实现Y-△降压启动控制

用3个接触器的Y-△降压启动控制线路如图15所示。按下启动按钮SB1，KM1、KT、KM3获电动作，电动机绕组接成Y形降压启动。时间继电器达到整定延时时间后，延时闭合的常开触点闭合，延时断开的常闭触点断开，KM3失电释放，这时KM3常闭辅助触点闭合，使KM2获电动作，电动机绕组由Y形接法转换成△形接法，启动过程结束。

这种控制线路适用于55kW以下、13kW以上的△形接法的电动机。

A16B-1210-0470 

A16B-1210-0470

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