SIEMENS 505-6108
SIEMENS 505-6108
SIEMENS 505-6108
SIEMENS 505-6108
(1) 熱工人員檢查發(fā)現(xiàn)，DCS 1號柜的24VDC電源有一個跳閘，該電源為SCS(順序控制系統(tǒng))站的開關(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)機組跳閘的直接原因。
導(dǎo)致電源跳閘的主要原因是過載。事實上，只要有任何一個I/O通道出現(xiàn)接地，而對應(yīng)的分保險不能及時燒斷的話，就可能導(dǎo)致總電源過載跳閘。
(2) SDM的開關(guān)量輸入通道要求高低電平信號，輸入的無源接點需經(jīng)過外部電源轉(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)榈碗娖剑?0"。
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