施耐德模块140CPS21400C Quantum

140CPS21400C Quantum

合上开关QS，使钥匙式按钮SB1闭合，接触器KM线圈得电，接触器主触点闭合，电动机启动运行，同时时间继电器KT1线圈得电，开始计时；

时间继电器KT1整定时间到，延时闭合触点闭合，使中间继电器KA线圈得电，其常闭触点KA断开，使交流接触器KM线圈失电，主触点断开，电动机停止运行；

同时中间继电器KA常开触点闭合，使KT2线圈得电并计时，KT2整定时间到，延时断开触点断开，中间继电器KA和时间继电器KT2线圈失电，中间继电器常闭触点复位，接触器KM线圈得电，电动机开始运行，不断循环实现了间歇运行控制。

电路中时间继电器 KT1的作用是控制运行时间，KT2的作用是控制停止时间。电动机停止工作时断开按钮SB1即可。

常见故障分析

电动机不能启动

按下钥匙式按钮SB1时若电动机不能启动，应首先检查电源电压，然后检查主电路和控制电路。主电路正常时，其可能原因是控制电路中熔断器FU2熔体熔断、热继电器常闭触点未闭合、交流接触器KM线圈断线等。

电动机不能停歇

原因可能为时间继电器KT1线圈断线，触点不能延时闭合。或中间继电器KA线圈断线，常闭触点KA不能断开。

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