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yb6byl
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樓主  發(fā)表于: 2018-04-18 15:16
ABB變頻器ACS510 4kw，靜態(tài)測量該變頻器正常。直流母線(xiàn)之間也沒(méi)有短路。給變頻器上380v電源，發(fā)現變頻發(fā)出吱吱的響聲，但是屏幕不亮，判斷是開(kāi)關(guān)電源損壞。測量開(kāi)關(guān)管損壞，有個(gè)10歐姆電阻燒斷，將他們更換，上電沒(méi)有30秒，電路板冒煙，斷電檢查發(fā)現是啟動(dòng)電阻燒毀，并且開(kāi)關(guān)管k2225又被擊穿。是什么原因導致這種情況發(fā)生？要是大電流的話(huà)有可能是哪里產(chǎn)生的大電流？
wanghuhong
級別: 網(wǎng)絡(luò )英雄

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1樓  發(fā)表于: 2018-04-23 11:57
你換上去的電阻值正確不?

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