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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。
李志華
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1樓  發(fā)表于: 2015-05-10 21:17
不同品牌不同型號的開(kāi)關(guān)電源電路都不盡相同，怎么知道阻止有多大呢？你拆一個(gè)新的看看不就知道了

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