为避免plc和变频器之间的控制信号线受空间电磁场的烦扰，可在这些控制信号线的外层接屏蔽线，以跋涉系统的抗烦扰才华。此种接线必定要留意，对屏蔽的接地址只能选取一点。不管是在PLC一边，仍是在变频器的一边。通常选在信号接纳端，即变频器一边。这么，可跋涉系统的抗烦扰才华。假设屏蔽线在两端都接地，会使屏蔽线上有电流流过，不但不能跋涉系统的抗烦扰的才华，反而会加重外界对PLC的烦扰。
（1）松下变频器上电无闪现
在DV707系列变频器修补中，笔者常常会碰到的缺点便是上电无闪现，打扫外部电源，闪现器等要素，大都情况下是开关电源的损坏，在修补中我们可以留意到DV707系列变频器的脉冲变压器是较易损坏的器材，因为遭到高频导磁材料，带负载才华，开关电源短路过流维护电路计划等一些要素的影响，在脉冲变压器的初级绕组侧易出现烧坏景象，因为脉冲变压器的骨架计划不一样于通常的升/降压变压器，不易拆开，通常在拆开后也会出现导磁材料裂开，联接处闭合磁场出现空地，脉冲变压器不能正常工作。通常情况下更换脉冲变压器。 

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