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wangqiang82
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樓主  發(fā)表于: 2010-11-25 13:48
情況是這樣的：控制柜用的24VDC電源是通過(guò)開(kāi)關(guān)電源從380VAC轉換為24VDC的，控制柜上有DC24V的燈泡。剛通上380VAC電源的時(shí)候，燈泡亮了1分鐘左右就滅了；測量了開(kāi)關(guān)電源的輸入端是380VAC，而輸出端DC則很小，幾乎為零。請問(wèn)這是為什么��？

380VAC是從電機的三相取了兩相火線(xiàn)。

按照有些大哥說(shuō)的我把負載斷掉了，輸出為18-19VDC，是不是開(kāi)關(guān)電源壞了？
[ 此帖被wangqiang82在2010-11-25 17:17重新編輯 ]
zyfzxh
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1樓  發(fā)表于: 2010-11-25 15:32
2樓,5樓說(shuō)的很對，先將負載斷開(kāi)看看輸出電壓是否有變正常

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