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    如何上電檢修變頻器的主電路?

    2017-06-08下載文件:暫時(shí)沒(méi)有下載文件

    ? ? 變頻器維修好試機(jī)時(shí),啟動(dòng)瞬間是“最要命”的一個(gè)瞬間,如果在沒(méi)有一點(diǎn)防護(hù)措施下匆忙上電,很容易使新?lián)Q上的價(jià)值昂貴的模塊剎那間損壞。不僅以前所付出的檢修的努力白廢了,而且還造成更大的損失,甚至有可能使故障范圍擴(kuò)大。那么我們應(yīng)該如何上電檢修變頻器的主電路呢?

    ????首先,將逆變模塊的供電斷開,其實(shí)電路中為連接銅排,拆去一段連接銅排,即將三相逆變電路的正供電端斷開。(注意:斷開點(diǎn)必須在儲(chǔ)能電容之后!如果在KM之前斷開,儲(chǔ)能電容上的儲(chǔ)存電量,會(huì)在逆變電路故障發(fā)生時(shí),釋放足夠的能量將逆變模塊炸毀?。┻B接簡(jiǎn)圖如下:

    變頻器逆變回路的上電檢修電路接線圖1

    ? ? ? 可以在斷開處串入兩只25W交流220V燈泡,因變頻器直流電壓約為530V左右,一只燈泡的耐壓不足(故障情況下),須兩只串聯(lián)以滿足耐壓要求。這樣即使逆變電路有短路故障存在,由于燈泡的降壓限流作用,將逆變電路的供給電流限于100mA以內(nèi),所以逆變模塊也不會(huì)再有損壞的危險(xiǎn)。

    ? ? 變頻器空載,U、V、W端子不接任何負(fù)載。先切斷驅(qū)動(dòng)電路的模塊OC信號(hào)輸出回路,避免CPU做出停機(jī)保護(hù)動(dòng)作,中斷試機(jī)過(guò)程。上電后可能出現(xiàn)如下種情況:

    ????1、變頻器在停機(jī)狀態(tài),燈泡亮。三只模塊有一只上、下臂IGBT漏電,如Q1和Q2。此種漏電在低電壓情況下不易暴露,如萬(wàn)用表不能測(cè)出,但引入直流高壓后,出現(xiàn)了較大的漏電,說(shuō)明模塊內(nèi)部有嚴(yán)重的絕緣缺限。(購(gòu)買的拆機(jī)品模塊有時(shí)候就會(huì)出現(xiàn)這種情況。)可用排除法檢修,如拆除U相模塊(Q1、Q2)后燈泡不亮了,說(shuō)明該模塊已損壞。

    ????2、上電后,燈泡不亮,但接受運(yùn)行信號(hào)后,燈光隨頻率的上升同步閃爍發(fā)亮,說(shuō)明三相逆變模塊中,出現(xiàn)一相上臂或下臂IGBT損壞故障。如當(dāng)Q1激勵(lì)信號(hào)而開通時(shí),已損壞的Q2與導(dǎo)通的Q1一起,形成了對(duì)供電電源的短路。兩只串聯(lián)燈泡承受530V直流電壓而發(fā)出亮光。

    ????3、上電后,燈泡不亮,接受運(yùn)行信號(hào)后,燈泡仍不亮;用指針式萬(wàn)用表的交流500V檔,測(cè)量U、V、W端子輸出電壓,隨頻率上升而均勻上升,三相輸出電壓平衡。說(shuō)明逆變輸出模塊基本上是好的,可以帶些負(fù)載試驗(yàn)了。

    ????4、上電后,燈泡不亮,啟動(dòng)變頻器后,燈泡仍不亮。但測(cè)量三相輸出電壓,不平衡,嚴(yán)重偏相。故障原因:a、某一臂IGBT管子內(nèi)部已呈開路性損壞;b、某一臂IGBT管子導(dǎo)通內(nèi)阻變大,接近開路狀態(tài)了。


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