在图1是三相异步电动机正反转控制的主电路和继电器控制电路图，图2与3是功能与它相同的PLC控制系统的外部接线图和梯形图，其中，KM1和KM2分别是控制正转运行和反转运行的交流接触器。
武汉路易达自动化设备有限公司
联系人：李先生
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地址：武汉市东西湖区走马岭汇通公路港信息交易中心3-035
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