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路龍遠
老師：有了您們的指教又使我在學(xué)習工控上又上了一個(gè)新的臺階！
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樓主  發(fā)表于: 2012-04-01 20:04
廠(chǎng)里一臺37kw變頻，最近出現欠電壓而保護停機，查輸入電壓385三相電壓正常，負載電流為恒流40A，如果說(shuō)是輸入電壓?jiǎn)?wèn)題可同一電柜另三臺（一臺30Kw，一臺7.5Kw，另一臺5.5Kw)又沒(méi)有出現故障，為了不花錢(qián)維修，決定和另一臺30Kw的互換主板和控制板，互換后設定參數開(kāi)機有一星期還沒(méi)有出現故障。請教這是什么原因？
jaby
一個(gè)不看書(shū)的人
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1樓  發(fā)表于: 2012-04-07 13:05
我也遇到過(guò)！吹一下機內灰塵，將螺絲再固定緊，往接線(xiàn)端子內加干凈機油或變壓油。如果不行就是電容老化，或可控硅有損壞現象。再就是主板的電壓保護有問(wèn)題！一般采用代換法是最好的維修方法！少走彎路

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