原理:用接近开关(24V)控制中间继电器(24V线圈),中间继电器主触点控制电磁阀。
接线方法:
1、接近开关一般都是三线制(PNP或NPN,另外需要一个24V开关电源),分别为正极电源线、地线、信号线。按照接近开关接法,电源线接24V开关电源的正负,信号线接中间继电器的线圈输入端(控制线圈的吸合或者断开)。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/060828381f30e924a1ac5de542086e061c95f7de?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、继电器的输出输出端接24V电源的负极(PNP和NPN的信号输出电压不同,信号是低有效,则接电源正极)。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/4afbfbedab64034f8bbb03d2a1c379310b551df4?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、将220V电源与中间继电器的常开触点,电磁阀串成回路组成主电路(也可以用常闭,根据需求选择),这样接近开关工作,电磁阀动作,反之,不工作。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/43a7d933c895d143449825f77df082025baf077c?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)