西门子S300系列6ES7321-1FH00-0AA0

6ES7321-1FH00-0AA0

点动正转控制线路是用按钮、接触器来控制电动机运转的简单的正转控制线路。所谓点动控制是指：按下按钮，电动机就得电运转；松开按钮，电动机就失电停转。

典型的三相异步电动机的点动控制电气原理图如图(a)所示。点动正转控制线路是由转换开关QS、熔断器FU、启动按钮SB、接触器KM及电动机M组成。其中以转换开关QS作电源隔离开关，熔断器FU作短路保护，按钮SB控制接触器KM的线圈得电、失电，接触器KM的主触头控制电动机M的启动与停止。

点动控制原理：当电动机需要点动时，先合上转换开关QS，此时电动机M尚未接通电源。按下启动按钮SB，接触器KM的线圈得电，带动接触器KM的三对主触头闭合，电动机M便接通电源启动运转。当电动机需要停转时，只要松开启动按钮SB，使接触器KM的线圈失电，带动接触器KM的三对主触头恢复断开，电动机M失电停转。在生产实际应用中，电动机的点动控制电路使用非常广泛，把启动按钮SB换成压力接点、限位节点、水位接点等，就可以实现各种各样的自动控制电路，控制小型电动机的自动运行。

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