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闵佳宏4223km2主触头相序为什么跟km1相反,后面的电路主电路都是这样 -
彭振翔13315907300 ______ (1)这是交流接触器.控制的三相交流电动机正反转电路.通过km1和km2主触头改变电动机电源的相序,实现正反转.(2)km1和km2的常开辅助触头分别与正反转启动按钮并联,松开按钮后,通过辅助触头为接触器线圈供电实现自锁.km1和km2的常闭触头分别与对方接触器线圈串联,在其中一个接触器吸合的同时,切断另一个接触器线圈的电源而不得吸合,实现互锁.(3)实现过载保护的是热继电器FR.
闵佳宏4223动合(常开)主触头和动合(常开)辅助触头 动断(常闭)主触头和动断(常闭)辅助触头 的作用是什么? -
彭振翔13315907300 ______ 当按下正转启动按钮SB2后,电源相通过热继电器FR的动断接点、停止按钮SB1的动断接点、正转启动按钮SB2的动合接点、反转交流接触器KM2的常闭辅助触头、正转交流接触器线圈KM1,使正转接触器KM1带电而动作,其主触头闭合使电...
闵佳宏4223在同一电气控制原理图中,KM1,等电子原件出现多次,都以同样的名字出现?是怎么回事? -
彭振翔13315907300 ______ 因为KM1表示接触器,接触器中有线圈,常开辅助点,常闭辅助点.它们在原理图中都参加接线.所以不管是接触器的线圈还是接触器的辅助也好,都标KM1
闵佳宏4223在控制电路中,有km1常开,常闭触点,那是不是线圈得电后常开变闭合,和变开 -
彭振翔13315907300 ______ 是的.非常正确!