3HAC
一定要重视负载容量。
输出端口须遵循容许大电流绑缚,以确保输出端口的发热绑缚在容许规划。继电器的运用寿数与负载容量有关,当负载容量添加时,触点寿数将大大下降,因而要特别重视。
一定要重视负载性质,
理性负载在开合瞬间会发生瞬间高压,因而表面上看负载容量可能并不大,可是实际上负载容量很大,继电器的寿数将大大缩短,因而当驱动理性负载时应在负载两头接入吸收维护电路。尤其在作业频率比较高时有必要添加维护电路。从客户的运用状况来看,添加吸收维护电路后的改善作用非常显着。
依据电容的特性,如果直接驱动电容负载,在导通瞬间将发生冲击浪涌电流,因而原则上输出端口不宜接入容性负载,若有必要,需确保其冲击浪涌电流小于标准阐明中的大电流。
一定要重视动作频率。
当动作频率较高时,建议选择晶体管输出类型,如果一同还要驱动大电流则能够运用晶体管输出驱动中心继电器的方法。当操控步进电机/伺服系统,或许用到高速输出/PWM波,或许用于动作频率高的节点等场合,只能选用晶体管型PLC
对扩展模块与主模块的输出类型并不要求一同,因而当系统点数较多而功用各异时,能够考虑继电器输出的主模块扩展晶体管输出或晶体管输出主模块扩展继电器输出以抵达佳协作。
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