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松川中间继电器型号选型

2016/8/8 10:01:58点击:

中间继电器顾名思义就是放在中间环节使用的,用在低电压启动高电压的过渡环节,一般我们使用的中间继电器电压都是DC24V(直流24V是人体安全电压,当然也不绝对),比如用plc控制大功率的电机,PLC触点承载的电流比较小,所以用PLC的触点驱动中间继电器的线圈;用中间继电器的触点控制接触器的线圈,接触器的触点控制电机的电源
中间继电器的电压一般选用DC24V,触点的电流一般是交流5A左右。比如欧姆龙品牌的选用MY2N-J就可以了,如果使用的触点多可以选用MY4N-J(有4组常开常闭触点),记得购买底座哦,分开销售的。
中间继电器的作用是将一个输入信号变成一个或多个输出信号的继电器。它的输人信号为线圈的通电或断电,当通电后电磁线圈产生的磁力便开始吸合触头。它的输出是触头的动作,将信号同时传给几个控制原件或回路。
常用的中间继电器有JZ7系列和JZ8系列两种,JZ7系列继电器的结构下右图所示,它与接触器相似。由线圈、静铁芯、动铁芯、触头系统及反作用弹簧组成。它的触头较多,一般有8对,可组成4对常开、4对常闭或六对常开、2对常闭或8对常开三种形式。


中间继电器的选择主要依据被控制电路的电压等级,以及所需触头的数量、种类及容量等要求来选择。