描述
安川616G5,3.7kW的變頻器,故障現(xiàn)象為三相輸出正常,但在低速時電動機抖動,無法進(jìn)行正常運行。首先估計多數(shù)為變頻器驅(qū)動電路損壞,正確的解決辦法應(yīng)該是確定故障現(xiàn)象后將變頻器打開,將IGBT逆變模塊從印刷電路板上卸下,使用電子示波器觀察六路驅(qū)動電路打開時的波形是否一致,找出不一致的那一路驅(qū)動電路,更換該驅(qū)動電路上的光耦,一般為PC923或者PC929,若變頻器使用年數(shù)超過3年,推薦將驅(qū)動電路的電解電容全部更換,然后再用示波器觀察,待六路波形一致后,裝上IGBT逆變模塊,進(jìn)行負(fù)載實驗,抖動現(xiàn)象消除。
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