电路分析:按下启动按钮SB2,1号电机启动,按下SB4,2号电动机启动。此时按下停止按钮SB3是无效的,要想2号电动机停止,必须先停止1号电机,1号电机停止,KM1的辅助常开点复位,再按SB3,2号电机停止。
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