5D32022G01西屋
DCS系統的接地原則
2.1 DCS系統設置的接地裝置
(1) 操作臺、打印臺、服務器柜：設有保護地螺釘。
(2) 繼電器柜、UPS柜、配電柜：設有保護地螺釘。
(3) DCS的I/O機柜：設有屏蔽接地匯流排，保護地螺釘。系統地（+24V地）懸浮。
(4) 儀表柜、手操盤臺：設有屏蔽地接地匯流排，保護地螺釘。
(5) 安全柵柜：設有屏蔽地接地匯流排，本安地接地匯流排，保護地螺釘。
2.2 信號屏蔽及其接地
(1) 根據有關技術規定要求，計算機或 DCS系統信號電纜的屏蔽層不得浮空，必須接地，其接地方式應符合下列規定：
a. 當信號源浮空時，屏蔽層應在計算機側接地；
b. 當信號源接地時，屏蔽層應在信號源側接地；
c. 當放大器浮空時，屏蔽層的一端與屏蔽罩相連，另一端宜接共模地（當信號源接地時，接信號地。當信號源浮空時接現場地）。
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