描述

MIC-3D-4XGE-XFP

造成驅(qū)動(dòng)損壞的原因是各種各樣的，一般來說，出現(xiàn)的問題也無非是U、V、W三相無輸出或輸出不平衡，或輸出平衡但是在低頻時(shí)抖動(dòng)，還有啟動(dòng)報(bào)警等。當(dāng)一臺(tái)變頻器大電容后的快速熔斷器斷開，或者是IGBT逆變模塊損壞的情況下，驅(qū)動(dòng)電路基本都不可能完好無損，切不可換上好的快速熔斷器或IGBT逆變模塊，這樣很容易造成剛換上的新器件再次損壞。這時(shí)應(yīng)該著重檢查驅(qū)動(dòng)電路上是否有打火的印記?？梢韵葘GBT逆變模塊的驅(qū)動(dòng)腳連線拔掉，用萬用表電阻擋測量六路驅(qū)動(dòng)是否阻值都相同（但是極個(gè)別的變頻器驅(qū)動(dòng)電路不是六路阻值都相同的，如三菱、富士等變頻器）。如果六路阻值都基本相同也不能完全證明驅(qū)動(dòng)電路是完好的，接著需要使用電子示波器測量六路驅(qū)動(dòng)電路上電壓是否相同，當(dāng)給定一個(gè)起動(dòng)信號(hào)時(shí)六路驅(qū)動(dòng)電路的波形是否一致。如果沒有電子示波器，也可以嘗試使用數(shù)字式電子萬用表來測量驅(qū)動(dòng)電路六路的直流電壓。一般來說，未起動(dòng)時(shí)的每路驅(qū)動(dòng)電路上的直流電壓約為10V，起動(dòng)后的直流電壓為2耀3V，如果測量結(jié)果一切正常的話，基本可以判斷此變頻器的驅(qū)動(dòng)電路是好的。接著就將IGBT逆變模塊連接到驅(qū)動(dòng)電路上，但是記住在沒有100%把握的情況下，最穩(wěn)妥的方法還是將IGBT逆變模塊的P從直流母線上斷開，中間串聯(lián)一組燈泡或一個(gè)功率大一點(diǎn)的電阻，這樣能在電路出現(xiàn)大電流的情況下，保護(hù)IGBT逆變模塊不被大電容的放電電流燒壞。下面介紹幾個(gè)在維修變頻器時(shí)和驅(qū)動(dòng)電路有關(guān)的實(shí)例。

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