0190-02815 XYCOM系統(tǒng)卡件
0190-02815 XYCOM系統(tǒng)卡件
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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
      變頻器的線路維護,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)問題擴大化,所以會涉及到變頻器的進線開關(guān)器材、熔斷器的裝備,詳細器材的容量的挑選,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斷路器作為進線維護。

      圖1 S120的整流側(cè)結(jié)構(gòu)圖

      關(guān)于進線側(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,其實有些因小失大。

      1、 空氣斷路器的呼應(yīng)時刻是維護不了變頻器的整流橋的。比方,進線不加快速熔斷器,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線端子上,實際上這種規(guī)劃從維護視點是不完善的, 當變頻器直流發(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線端子上,從安全視點也是存在危險的,可能對操作工形成傷害,實際上這種規(guī)劃從操作視點是不便利的,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,還可以自動分斷進線側(cè)的接觸器, 防止毛病擴大化 。

      3、 有關(guān)變頻器線路維護,進線側(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不了,從系統(tǒng)維護的可靠性方面剖析,開關(guān)器材也存在失效的可能,并且各自的功用也不一樣,所以變頻器進線維護器材不能省,不能因小失大。

      4、 進線沒有維護損失慘重,血的經(jīng)驗。

      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,當變頻器運轉(zhuǎn)過程中到達或許挨近變頻器的答應(yīng)規(guī)模,就會宣布報警或許毛病信號,進行預(yù)警或許停機維護;變頻器的維護功用許多,這兒以最常見維護功用舉例,比方過壓、欠壓、過流、過熱、缺相等等。

      1、 過壓維護(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倍的溝通進線電壓核算,一般為DC 520V-DC 540V之間,當變頻器所驅(qū)動的負載慣量比較大,快速降速時,或許變頻器拖動位能性負載下放時,電機轉(zhuǎn)子實際轉(zhuǎn)速高于變頻器輸出給電機的轉(zhuǎn)速,形成負載反拖電機,電機 處于發(fā)電運轉(zhuǎn)狀況,機械能轉(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,因為直流母線的電容容量固定, 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(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,再分斷進線開關(guān),防止人為形成欠電壓毛病。

      3、 過流維護(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區(qū)別于電機的過流維護,一般滯后于電機的過流維護。

      4 、過熱維護(F4):變頻器運轉(zhuǎn)過程中,功率器材會發(fā)熱,正常情況下,變頻器的散熱風機可以使得變頻器發(fā)熱散熱平衡,不至于變頻器報毛病,可是當環(huán)境溫度過高,變頻器過載運轉(zhuǎn),冷卻風機毛病、冷卻風道不通暢,也會導(dǎo)致變頻器過熱,極點情況會導(dǎo)致功率器材損壞;一般引發(fā)過熱毛病,大都因為變頻器柜裝置環(huán)境差,風道阻塞所造成的。


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