電氣專業(yè)如何計(jì)算DCS控制系統(tǒng)點(diǎn)數(shù)
(1)降壓?jiǎn)?dòng)電氣控制的DCS控制系統(tǒng)點(diǎn)數(shù)
每個(gè)降壓?jiǎn)?dòng)回路電機(jī)全壓運(yùn)行狀態(tài)信號(hào)(來自于主接觸器1KM1輔助觸點(diǎn))計(jì)算DI輸入1個(gè)點(diǎn),DCS啟動(dòng)/停止控制信號(hào)(接接觸器線圈)計(jì)算DO輸出1個(gè)點(diǎn),電氣故障信號(hào)(來自熱繼電器或者電機(jī)保護(hù)器過載信號(hào))計(jì)算DI輸入1個(gè)點(diǎn),電機(jī)電流信號(hào)(來自三相電流變送器)計(jì)算AI輸入點(diǎn)數(shù)3個(gè)點(diǎn)(電機(jī)A、B、C相電流變送器);如電機(jī)需多地控制,則控制地點(diǎn)選擇開關(guān)狀態(tài)(選擇DCS系統(tǒng)控制時(shí))計(jì)算DI輸入1個(gè)點(diǎn)。
(2)變頻器控制的DCS控制系統(tǒng)點(diǎn)數(shù)
每個(gè)變頻器運(yùn)行狀態(tài)信號(hào)(來自于中間繼電器觸點(diǎn))計(jì)算DI輸入1個(gè)點(diǎn),DCS系統(tǒng)啟動(dòng)/停止控制信號(hào)(接中間繼電器線圈)計(jì)算DO輸出1個(gè)點(diǎn), 變頻故障信號(hào)(來自變頻器)計(jì)算DI輸入1個(gè)點(diǎn),故障復(fù)位計(jì)算DO輸出1個(gè)點(diǎn),變頻頻率反饋信號(hào)計(jì)算AI輸入點(diǎn)數(shù)1個(gè)點(diǎn);變頻頻率給定信號(hào)計(jì)算AO輸出1個(gè)點(diǎn)。
(3)電機(jī)正反轉(zhuǎn)控制的DCS控制系統(tǒng)點(diǎn)數(shù)
電機(jī)正轉(zhuǎn)運(yùn)行狀態(tài)/反轉(zhuǎn)運(yùn)行狀態(tài)(來自接觸器輔助觸點(diǎn))計(jì)算D1輸入2個(gè)點(diǎn),正轉(zhuǎn)故障/反轉(zhuǎn)故障信號(hào)(來自熱繼電器)計(jì)算DI輸入2個(gè)點(diǎn),正轉(zhuǎn)控制/反轉(zhuǎn)控制(接接觸器線圈)計(jì)算DO輸 出2點(diǎn),電機(jī)電流反饋信號(hào)最多計(jì)算AI輸入3個(gè)點(diǎn)(無電流反饋不計(jì)算該點(diǎn))。
(4)DCS系統(tǒng)兼容PLC功能,復(fù)雜的邏輯控制按照實(shí)際工程要求來計(jì)算DCS系統(tǒng)I/O點(diǎn)數(shù)(計(jì)算方法與計(jì)算PLC點(diǎn)數(shù)方法相同)。
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