描述
?如果變頻器周圍存在干擾源，它們將通過輻射或電源線侵入變頻器的內(nèi)部，引起控制回路誤動作，造成工作不正常或停機，嚴重時甚至損壞變頻器。減少噪聲干擾的具體方法有：變頻器周圍所有繼電器、接觸器的控制線圈上，加裝防止沖擊電壓的吸收裝置，如RC浪涌吸收器，其接線不能超過20cm；盡量縮短控制回路的配線距離，并使其與主回路分離；變頻器控制回路配線絞合節(jié)距離應(yīng)在15mm以上，與主回路保持10cm以上的間距；變頻器距離電動機很遠時（超過100m），這時一方面可加大導線截面面積，保證線路壓降在2%以內(nèi)，同時應(yīng)加裝變頻器輸出電抗器，用來補償因長距離導線產(chǎn)生的分布電容的充電電流。（http://www.diangon.com/版權(quán)所有）變頻器接地端子應(yīng)按規(guī)定進行接地，必須在專用接地點可靠接地，不能同電焊、動力接地混用；變頻器輸入端安裝無線電噪聲濾波器，減少輸入高次諧波，從而可降低從電源線到電子設(shè)備的噪聲影響；同時在變頻器的輸出端也安裝無線電噪聲濾波器，以降低其輸出端的線路噪聲。?變頻器的生產(chǎn)廠家在設(shè)計或制造變頻器時，其內(nèi)部印制板、金屬件等構(gòu)件的材料很多都未經(jīng)過防潮濕和防霉變的處理。如果此類變頻器長期在潮濕的環(huán)境下工作，就容易導致變頻器內(nèi)部的金屬構(gòu)件發(fā)生銹蝕，特別是導電銅排在高溫情況下運行，更會加劇銹蝕的發(fā)生。本文介紹了如何防止變頻器備件的防潮濕霉變：變頻器發(fā)生銹蝕之后很容易降低使用壽命或造成徹底損壞，特別是變頻器內(nèi)部的微機控制板和驅(qū)動電源板上的細小銅質(zhì)導線，最易發(fā)生銹蝕。變頻器如果需要在潮濕的環(huán)境中工作，則需要對內(nèi)部的部件進行防潮濕、防霉變處理，以應(yīng)對銹蝕的發(fā)生。變頻器的防潮濕和防霉變處理方法有很多，例如在印刷電路板是對其進行三防漆噴涂處理，或在處理結(jié)構(gòu)件時使用鍍鎳鉻等工藝處理。變頻器的控制柜對變頻器的防潮濕和防霉變也有一定的作用，例如采用防塵控制柜。變頻器的控制柜可以采用防塵設(shè)計，包括采用防護網(wǎng)、防塵網(wǎng)和防護頂蓋出風口等。變頻器防塵控制柜的安裝可以是在單獨的密閉空調(diào)機房內(nèi)，這樣的安裝方式更適合控制多設(shè)備，且建立機房的成本低于柜體單獨密閉處理的場合。變頻器控制柜的進風口應(yīng)獨立設(shè)置在柜體的底部，進風口與地溝相通，地溝的設(shè)計要求是獨立、密閉，并在防塵柜進風口的位置安裝防塵網(wǎng)。變頻器控制柜所連接的地溝如果超過5米以上，則應(yīng)考慮安裝鼓風機以保持通風。變頻器的控制柜內(nèi)還可以放置干燥機或活性炭，以保證吸收濕氣或其他有毒氣體，避免變頻器材料的銹蝕，干燥劑或活性炭需要及時更換。
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