SIEMENS 505-6108

　(1) 熱工人員檢查發(fā)現(xiàn)，DCS 1號(hào)柜的24VDC電源有一個(gè)跳閘，該電源為SCS(順序控制系統(tǒng))站的開(kāi)關(guān)量I/O模板SDM的各通道提供外部電源。經(jīng)分析，該電源跳閘是引發(fā)機(jī)組跳閘的直接原因。

　　導(dǎo)致電源跳閘的主要原因是過(guò)載。事實(shí)上，只要有任何一個(gè)I/O通道出現(xiàn)接地，而對(duì)應(yīng)的分保險(xiǎn)不能及時(shí)燒斷的話，就可能導(dǎo)致總電源過(guò)載跳閘。

　　(2) SDM的開(kāi)關(guān)量輸入通道要求高低電平信號(hào)，輸入的無(wú)源接點(diǎn)需經(jīng)過(guò)外部電源轉(zhuǎn)換成高低電平。如圖1中所示的SDM輸入通道接線原理，如果24VDC電源跳閘，各輸入通道變?yōu)榈碗娖?，?0"。

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