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0190-02815 XYCOM系統(tǒng)卡件
0190-02815 XYCOM系統(tǒng)卡件
0190-02815 XYCOM系統(tǒng)卡件
一、變頻器的線路維護(hù)
變頻器的線路維護(hù)，可以了解成在變頻器發(fā)作短路毛病時，變頻器可以從電網(wǎng)上別離，防止電網(wǎng)問題擴(kuò)大化，所以會涉及到變頻器的進(jìn)線開關(guān)器材、熔斷器的裝備，詳細(xì)器材的容量的挑選，西門子小功率變頻器的規(guī)范裝備是刀熔開關(guān)加接觸器的方式，大功率的變頻器選用3WL斷路器作為進(jìn)線維護(hù)。
關(guān)于進(jìn)線側(cè)的開關(guān)熔斷器等，一些規(guī)劃人員考慮本錢問題， 總想盡可能的省去一些東西，其實(shí)有些因小失大。
1、 空氣斷路器的呼應(yīng)時刻是維護(hù)不了變頻器的整流橋的。比方，進(jìn)線不加快速熔斷器，在變頻器前端配上一個空氣斷路器，后邊直接就連接到變頻器的進(jìn)線端子上，實(shí)際上這種規(guī)劃從維護(hù)視點(diǎn)是不完善的， 當(dāng)變頻器直流發(fā)作短路毛病時，大電流流經(jīng)變頻器的整流橋，很簡單形成整流側(cè)的損壞。
2、 操作空氣開關(guān)瞬間，可能發(fā)作拉弧現(xiàn)象。比方，不加進(jìn)線接觸器，在變頻器前端配上一個空氣斷路器，后邊直接就連接到變頻器的進(jìn)線端子上，從安全視點(diǎn)也是存在危險(xiǎn)的，可能對操作工形成傷害，實(shí)際上這種規(guī)劃從操作視點(diǎn)是不便利的，打開變頻器柜門，操作變頻器上電掉電；如果在變頻器的柜門經(jīng)過按鈕操作接觸器，既便利又安全；另外在變頻器發(fā)作毛病時，還可以自動分?jǐn)噙M(jìn)線側(cè)的接觸器， 防止毛病擴(kuò)大化 。
3、 有關(guān)變頻器線路維護(hù)，進(jìn)線側(cè)必要的器材不能省去， 雖然說變頻器毛病后會封閉輸出， 可是變頻器前端整流橋、直流回路的有些問題，變頻器自身可能維護(hù)不了，從系統(tǒng)維護(hù)的可靠性方面剖析，開關(guān)器材也存在失效的可能，并且各自的功用也不一樣，所以變頻器進(jìn)線維護(hù)器材不能省，不能因小失大。
4、 進(jìn)線沒有維護(hù)損失慘重，血的經(jīng)驗(yàn)。
由變頻器自身的條件所限，功率器材的耐壓、電流的約束、作業(yè)溫度等等，當(dāng)變頻器運(yùn)轉(zhuǎn)過程中到達(dá)或許挨近變頻器的答應(yīng)規(guī)模，就會宣布報(bào)警或許毛病信號，進(jìn)行預(yù)警或許停機(jī)維護(hù)；變頻器的維護(hù)功用許多，這兒以最常見維護(hù)功用舉例，比方過壓、欠壓、過流、過熱、缺相等等。
１、 過壓維護(hù)（F2）：此功用是為了防止呈現(xiàn)直流母線電壓過高，形成電容或許IGBT等器材損壞，變頻器判斷過壓的檢測點(diǎn)在直流母線，以3AC380-480V 溝通電壓等級為例， 正常直流母線電壓約為1.35倍的溝通進(jìn)線電壓核算，一般為DC 520V-DC 540V之間，當(dāng)變頻器所驅(qū)動的負(fù)載慣量比較大，快速降速時，或許變頻器拖動位能性負(fù)載下放時，電機(jī)轉(zhuǎn)子實(shí)際轉(zhuǎn)速高于變頻器輸出給電機(jī)的轉(zhuǎn)速，形成負(fù)載反拖電機(jī)，電機(jī) 處于發(fā)電運(yùn)轉(zhuǎn)狀況，機(jī)械能轉(zhuǎn)化為電能，經(jīng)過變頻器的逆變橋IGBT反并聯(lián)二極管回饋到變頻器的直流母線，因?yàn)橹绷髂妇€的電容容量固定， 隨著回饋能量的增加，直流母線電壓隨之升高，到達(dá)必定的限值可能導(dǎo)致器材的損壞，所以此刻有必要按捺過壓趨勢，比方投入制動單元制動電阻，激活直流電壓操控器等等。
２、 欠壓維護(hù)（F3）：此功用檢測出變頻器直流母線電壓低于某個值，比方正常1.35倍的溝通電壓，如果電壓再低10%，此刻變頻器可能發(fā)作欠電壓報(bào)警或毛病，欠壓毛病直接反映的是溝通側(cè)可能呈現(xiàn)了問題，欠壓維護(hù)的功用是防止變頻器直流母線電壓過低時，輸出功率受限，功率器材的作業(yè)特性發(fā)作變化，操控電壓異常，防止變頻器硬件呈現(xiàn)損壞，一般操作也要先中止變頻器輸出，再分?jǐn)噙M(jìn)線開關(guān)，防止人為形成欠電壓毛病。
３、 過流維護(hù)（F1）：一般變頻器的輸出電流超越變頻器的額定輸出電流某個約束值，一般是變頻器廠家研制層面的細(xì)節(jié)，與IGBT功率器材選型規(guī)劃裕量有關(guān)， 不同廠家，不同功率段也不一樣。變頻器自身的過流維護(hù)區(qū)別于電機(jī)的過流維護(hù)，一般滯后于電機(jī)的過流維護(hù)。
4 、過熱維護(hù)（F4）：變頻器運(yùn)轉(zhuǎn)過程中，功率器材會發(fā)熱，正常情況下，變頻器的散熱風(fēng)機(jī)可以使得變頻器發(fā)熱散熱平衡，不至于變頻器報(bào)毛病，可是當(dāng)環(huán)境溫度過高，變頻器過載運(yùn)轉(zhuǎn)，冷卻風(fēng)機(jī)毛病、冷卻風(fēng)道不通暢，也會導(dǎo)致變頻器過熱，極點(diǎn)情況會導(dǎo)致功率器材損壞；一般引發(fā)過熱毛病，大都因?yàn)樽冾l器柜裝置環(huán)境差，風(fēng)道阻塞所造成的。
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