廈門市泰尼電器有限公司
主營產品: AB模塊PLC |
廈門市泰尼電器有限公司
主營產品: AB模塊PLC |
參考價 | 面議 |
1.DCS接地分類
在一般情況下,DCS控制系統(tǒng)需要兩種接地:保護地和工作地(邏輯地、屏蔽地等)。對于裝有安全柵防爆措施的系統(tǒng)如化工行業(yè)所用的系統(tǒng),還要求有本安地。
(1) 保護地(CG,Cabinet Grounding) 是為了防止設備外殼的靜電荷積累、避免造成人身傷害而采取的保護措施。DCS系統(tǒng)所有的操作員機柜、現場控制站機柜、打印機、端子柜等均應接保護地。保護地應接至廠區(qū)電氣專業(yè)接地網,接地電阻小于4Ω。
(2) 邏輯地:也叫機器邏輯地、主機電源地,是計算機內部的邏輯電平負端公共地,也是+5V等的電源輸出地。如CPU的正負5伏、正負12伏的負端。需要接入公共接地極。
1746-ITV16---1746-ITV16
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(3) 屏蔽地(AG,Analog Grounding) 也叫模擬地,它可以把現場信號傳輸時所受到的干擾屏蔽掉,以提高信號精度。DCS系統(tǒng)中信號電纜的屏蔽層應做屏蔽接地。線纜屏蔽層必須一端接地,防止形成閉合回路干擾。鎧裝電纜的金屬鎧不應作為屏蔽保護接地,必須是銅絲網或鍍鋁屏蔽層接地。接入公共接地極。
(4) 本安地 應獨立設置接地系統(tǒng),接地電阻≤4Ω。本安地的接地系統(tǒng)應保持獨立,與廠區(qū)電氣地網或其它儀表系統(tǒng)接地網的距離應在5m以上。
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