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  在使用继电器接点时，常常因为接触不良而带来误动作；使用晶体管进行连接时，则需考虑晶体管本身的电压、电流容量等因素，以保证系统的可靠性。

  在设计变频器的输入信号电路时还应该注意，当输入信号电路连接不当时也会造成变频器的误动作。例如，当输入信号电路采用继电器等感性负载时，继电器开闭产生的浪涌电流有可能引起变频器内部元器件的损坏或失效进而导致变频器误动作，因此应尽量避免这种情况的发生。

 当输入开关信号进入变频器时，有时会发生外部电源和变频器控制电源（DC24V）之间的串扰。正确的连接是利用PLC电源，将外部晶体管的集电极经过二极管接到PLC。

另外，在使用PLC进行顺序控制时，由于进行数据处理需要时间，以及程序编写时排列的顺序不同和指令的使用不同等都会导致系统在运行时存在一定的时间延迟，故在较精确的控制时应予以考虑以上因素。

  因为变频器在运行中会产生较强的电磁干扰，为保证PLC不因为变频器主电路断路器及开关器件等产生的噪音而出现故障，故将变频器与PLC相连接时应该注意以下几点：

  （1）对PLC本身应按规定的接线标准和接地条件进行接地，而且应注意避免和变频器使用共同的接地线，且在接地时使二者尽可能分开。

  （2）当电源条件不太好时，应在PLC的电源模块及输入/输出模块的电源线上接入噪音滤波器、电抗器和能降低噪音用的器件等，另外，若有必要，在变频器输入一侧也应采取相应的措施。

  （3）当把变频器和PLC安装于同一操作柜中时，应尽可能使与变频器有关的电线和与PLC有关的电线分开。

  （4）通过使用屏蔽线和双绞线达到提高噪音干扰的水平。



产品型号：

(NEW) MSS POWER SYSTEMS 60 TON CRIMPING HEAD MSS-RH60 CABAC
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MAQ09B127V ALSTHOM MAQ 09B 127V / BOARD 16 OUTPUTS TOR 127V CONTINUOUS USED
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