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為避免plc和變頻器之間的控制信號線受空間電磁場的煩擾，可在這些控制信號線的外層接屏蔽線，以跋涉系統的抗煩擾才華。此種接線必定要留意，對屏蔽的接地址只能選取一點。不管是在PLC一邊，仍是在變頻器的一邊。通常選在信號接納端，即變頻器一邊。這么，可跋涉系統的抗煩擾才華。假設屏蔽線在兩端都接地，會使屏蔽線上有電流流過，不但不能跋涉系統的抗煩擾的才華，反而會加重外界對PLC的煩擾。
（1）松下變頻器上電無閃現
在DV707系列變頻器修補中，筆者常常會碰到的缺點便是上電無閃現，打掃外部電源，閃現器等要素，大都情況下是開關電源的損壞，在修補中我們可以留意到DV707系列變頻器的脈沖變壓器是較易損壞的器材，因為遭到高頻導磁材料，帶負載才華，開關電源短路過流維護電路計劃等一些要素的影響，在脈沖變壓器的初級繞組側易出現燒壞景象，因為脈沖變壓器的骨架計劃不一樣于通常的升/降壓變壓器，不易拆開，通常在拆開后也會出現導磁材料裂開，聯接處閉合磁場出現空地，脈沖變壓器不能正常工作。通常情況下更換脈沖變壓器。 

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