有時(shí)候制動(dòng)功率欠好斷定，或?yàn)榱舜_保安全，可挑選制動(dòng)功率較大的電阻
?因?yàn)楸緛眢w系中多塊SDC操控儀表呈現(xiàn)毛病，在維修中選用plc對(duì)原體系做替換改造。本來操控體系完結(jié)對(duì)潔凈房室內(nèi)溫度、濕度、室內(nèi)外壓差進(jìn)行查看并操控。室內(nèi)空氣請(qǐng)求為100級(jí)�？諝饨�(jīng)過過濾后變成潔凈空氣，滿意出產(chǎn)線對(duì)空氣潔凈度、溫濕度的請(qǐng)求。
一． 體系作業(yè)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)反響給操控器。由反響信號(hào)經(jīng)過數(shù)字操控儀來操控加熱、制冷交流器操控室內(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)除濕意圖。本來的濕度、溫度信號(hào)還要經(jīng)過高選處理。當(dāng)溫度信號(hào)高時(shí)，以溫度操控優(yōu)先；當(dāng)濕度信號(hào)高時(shí)，以濕度操控優(yōu)先。本來儀表調(diào)試對(duì)比冗雜，調(diào)試不簡(jiǎn)單滿意請(qǐng)求。加熱、制冷、加濕器的操控信號(hào)是4-20mA信號(hào)。壓力體系本來是由變頻器操控。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)經(jīng)過對(duì)比判別，當(dāng)輸入的溫度信號(hào)小于12mA時(shí)，要履行加熱邏輯，當(dāng)大于12mA時(shí)，要履行制冷邏輯。當(dāng)輸入的濕度信號(hào)小于12mA時(shí)，要履行加濕邏輯，當(dāng)大于12mA時(shí)，要履行除濕邏輯。而制冷和除濕信號(hào)中要選大的來操操控冷交流器。因?yàn)镻LC有極好的邏輯判別才干及數(shù)據(jù)處理才干，改造中選用了臺(tái)達(dá)DVPSS系列PLC。SS系列是模塊式結(jié)構(gòu)，能夠依據(jù)請(qǐng)求配備不相同的模仿模塊和數(shù)字量模塊。因?yàn)槭歉脑�，咱們運(yùn)用的數(shù)字量極少，僅用做毛病報(bào)警。DVP14SS CPU有8點(diǎn)輸入/6點(diǎn)輸出。依據(jù)咱們需求又配備了DVP04AD-S模仿輸入模塊和DVP04DA-S模仿輸出模塊。
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司
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