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為解決諧波干擾，主要采取以下措施：1）縮短控制線路長度。PLC系統采用集散結構，例如在起重機各部位設置PLC從站，共用一個PLC主站來實現集中控制與分布式布置，同時各PLC之間通過屏蔽電纜通訊，拖動部位可采用光纜。這樣，各部位控制線只需在內部走線，大大縮短了線路長度，降低了高次諧波干擾。2）控制信號通過中間繼電器輸入PLC，可**解除諧波干擾。3）控制信號線采用屏蔽電纜。4）變頻器輸出端加濾波器，變頻電機動力線采用屏蔽電纜。5）把PLC裝置做成柜或置于單獨的PLC室中，可降低變頻器等驅動裝置對PLC裝置的影響。
dⅡC電機隔爆性能的工藝的探究。針對dⅡC系列隔爆電機批量生產而研制的全套新工藝技術，經過多年的驗證、改進、完善、提高，特別是解決對發熱抱軸的質量攻關成功，使其更加成熟和穩定，為大批量投產dⅡC系列電機創造了條件。
　　dⅡC電機嚴密的隔爆結構要素帶來的制造技術難點分析。與一般隔爆電機（dⅡA、dⅡB系列）相比，dⅡC系列隔爆電機的隔爆接合面間隙參數W僅相當于前者的1/2～1/4。為此，按照GB3836《爆炸性氣體環境用電氣設備》標準所設計的dⅡC產品圖紙，其隔爆零部件的尺寸公差、形位公差和整機裝配精度，普遍較dⅡA、dⅡB系列圖紙要求提高1.5～2.5個等級，**的提高3級以上。水壓試驗值較dⅡA、dⅡB高1.5倍。

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資訊來源：漳州鼎晟達自動化設備有限公司