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haibin9964
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樓主  發(fā)表于: 2015-05-10 17:18
220vAC/DC24V開(kāi)關(guān)電源上電后幾分鐘，內部R18被燒壞，后面輸出24VDC負載就接了一個(gè)s7-200cpu224。之后換了一個(gè)75w的還是R18被燒，求各位高手指點(diǎn)。什么原因造成的。
輸入電壓237v左右。
gdj-gdj
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1樓  發(fā)表于: 2015-05-11 14:09
是不是電源輸入檔位選擇不對啊，有的24V電源上面有110V和220V輸入電壓選擇開(kāi)關(guān)的，如果選擇110V的檔位而輸入了220V的話(huà)，電源就會(huì )燒壞的，我以前遇到過(guò)。

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