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因?yàn)檎�本系統(tǒng)中多塊SDC控制表面出現(xiàn)缺點(diǎn)，在維修中選用plc對(duì)原系統(tǒng)做更換改造。正本控制系統(tǒng)結(jié)束對(duì)潔凈房室內(nèi)溫度、濕度、室內(nèi)外壓差進(jìn)行查看并控制。室內(nèi)空氣懇求為100級(jí)。空氣通過過濾后成為潔凈空氣，滿足出產(chǎn)線對(duì)空氣潔凈度、溫濕度的懇求。
一． 系統(tǒng)工作原理
新風(fēng)機(jī)鼓入的新風(fēng)經(jīng)加熱交流器、制冷交流器、加濕器進(jìn)入房間。房間內(nèi)有溫度、濕度、差壓查看器測(cè)的信號(hào)反響給控制器。由反響信號(hào)通過數(shù)字控制儀來控制加熱、制冷交流器控制室內(nèi)溫度。當(dāng)濕度低時(shí)，由加濕器輸出蒸汽；濕度高時(shí)，制冷交流器要降溫以使空氣溫度降低，到達(dá)除濕目的。正本的濕度、溫度信號(hào)還要通過高選處理。當(dāng)溫度信號(hào)高時(shí)，以溫度控制優(yōu)先；當(dāng)濕度信號(hào)高時(shí)，以濕度控制優(yōu)先。正本表面調(diào)試比照冗繁，調(diào)試不簡(jiǎn)略滿足懇求。加熱、制冷、加濕器的控制信號(hào)是4-20mA信號(hào)。壓力系統(tǒng)正本是由變頻器控制。本次改造并沒有觸及。
二． 改造計(jì)劃
溫度、濕度信號(hào)是變送器送出的DC 4-20mA 的信號(hào)。輸入的信號(hào)通過比照判別，當(dāng)輸入的溫度信號(hào)小于12mA時(shí)，要實(shí)行加熱邏輯，當(dāng)大于12mA時(shí)，要實(shí)行制冷邏輯。當(dāng)輸入的濕度信號(hào)小于12mA時(shí)，要實(shí)行加濕邏輯，當(dāng)大于12mA時(shí)，要實(shí)行除濕邏輯。而制冷和除濕信號(hào)中要選大的來控制制冷交流器。因?yàn)镻LC有極好的邏輯判別才華及數(shù)據(jù)處理才華，改造中選用了臺(tái)達(dá)DVPSS系列PLC。SS系列是模塊式構(gòu)造，可以根據(jù)懇求裝備不一樣的仿照模塊和數(shù)字量模塊。因?yàn)槭歉脑欤�我們運(yùn)用的數(shù)字量很少，僅用做缺點(diǎn)報(bào)警。DVP14SS CPU有8點(diǎn)輸入/6點(diǎn)輸出。根據(jù)我們需求又裝備了DVP04AD-S仿照輸入模塊和DVP04DA-S仿照輸出模塊。

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