DS200TCPAG1A
作者:2020/7/20 8:18:20

DS200TCPAG1A

有的热继电器有自动复位功能,即热继电器动作后电机停转,串接在主回路中的热继电器的热元件冷却,热继电器的触点自动***原状。如果这种热断电器的常闭触点仍然接在PLC的输出回路,电机停转后过一段时间会因热继电器的触点***原状而自动重新运转,可能会造成设备和人身事故。因此有自动复位功能的热继电器的常闭触点不能接在PLC的输出回路,必须将它的触点接在PLC的输入端(可接常开触点或常闭触点),用梯形图来实现电机的过载保护。如果用电子式电机过载保护器来代替热继电器,也应注意它的复位方式。

 

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