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PLC和變頻器采用串行總線方式通訊的變頻恒壓供水系統(tǒng)的構(gòu)成和工作原理。系統(tǒng)采用變頻調(diào)速方式自動(dòng)調(diào)節(jié)水泵電機(jī)轉(zhuǎn)速,保持供水壓力的恒定,在用水低谷時(shí)投入小流量泵,降低電能損耗。變頻器故障時(shí)仍能自動(dòng)運(yùn)行,保證不間斷供水,同時(shí)故障消除后能自啟動(dòng),實(shí)現(xiàn)無人值守全自動(dòng)運(yùn)行。關(guān)鍵詞:可編程控制器 變頻調(diào)速 串行通訊 小流量泵 在居民生活用水、工業(yè)用水、各類自來水廠、油田、油庫、鍋爐定壓供熱和恒壓補(bǔ)水噴淋及消防等供水系統(tǒng)中,采用傳統(tǒng)的水塔、高位水箱、氣壓增壓等設(shè)備,不但占地面積和設(shè)備投資大,維護(hù)困難,且不能滿足高層建筑、工業(yè)、消防等高水壓、大流量的快速供水需求。另一方面,由于供水量的隨機(jī)性,采用傳統(tǒng)方法難以保證供水的實(shí)時(shí)性,且水泵的選取往往是按Zui大供水量來確定,而高峰用水時(shí)間較短,這樣水泵在很長(zhǎng)一段時(shí)間內(nèi)有較大余量,不僅水泵效率低,供水壓力不穩(wěn),而且造成大量電力浪費(fèi)。這里介紹一種由可編程控制器控制的變頻恒壓供水系統(tǒng),它既能解決人工操作的繁雜勞動(dòng)和精神壓力,又能節(jié)約能源。系統(tǒng)介紹 [align=center] 圖1[/align] 變頻恒壓供水控制系統(tǒng)由PLC控制器、觸摸屏顯示器、變頻調(diào)速器、壓力變送器、水位變送器、交流接觸器等其它電控設(shè)備以及3臺(tái)水泵(水泵數(shù)量可以根據(jù)需要設(shè)置)和一臺(tái)小流量泵等構(gòu)成,如圖1所示。在供水系統(tǒng)總出水管上安裝壓力變送器檢測(cè)出水壓力,在蓄水池安裝液位變送器,PLC具有模擬量輸入檢測(cè)模塊,檢測(cè)壓力變送器和液位變送器輸出的4-20mA信號(hào),將檢測(cè)的壓力信號(hào)與設(shè)定的壓力信號(hào)經(jīng)過PID運(yùn)算后,通過控制變頻器的輸出頻率來調(diào)整電動(dòng)機(jī)的轉(zhuǎn)速,保持供水壓力的恒定,這樣就構(gòu)成了以設(shè)定壓力為基準(zhǔn)的壓力閉環(huán)系統(tǒng);自動(dòng)檢測(cè)水池水位信號(hào)與設(shè)定的水位低限比較,輸出水位低報(bào)警信號(hào)或直接停機(jī)。觸摸屏顯示器可以顯示電源電壓、電流、變頻器輸出頻率、實(shí)際供水壓力和設(shè)定供水壓力和各泵的工作狀態(tài)等信息;可以通過觸摸屏在線修改設(shè)定供水壓力和控制水泵的運(yùn)行。該系統(tǒng)還設(shè)有多種保護(hù)功能,尤其是強(qiáng)電邏輯硬件互鎖功能,從而保證正常供水,且可以做到無人值守。
工作原理 該系統(tǒng)具有手動(dòng)和自動(dòng)兩種運(yùn)行方式: 2.1手動(dòng)運(yùn)行方式 選擇此方式時(shí),按啟動(dòng)按鈕泵或停止按鈕,可根據(jù)需要而分別啟停各水泵。這種方式僅供檢修或控制系統(tǒng)出現(xiàn)故障時(shí)使用?! ?.2自動(dòng)運(yùn)行方式 2.2.1啟動(dòng)程序 在自動(dòng)運(yùn)行方式下開始啟動(dòng)運(yùn)行時(shí),首先檢測(cè)水池水位,若水池水位符合設(shè)定水位要求,1#泵變頻交流接觸器吸合,電機(jī)與變頻器連通,變頻器輸出頻率從0Hz開始上升,此時(shí)壓力變送器檢測(cè)壓力信號(hào)反饋PLC,由PLC經(jīng)PID運(yùn)算后控制變頻器的頻率輸出;如壓力不夠,則頻率上升至50Hz,延時(shí)一定時(shí)間后,將1#泵切換為工頻,2#泵變頻交流接觸器吸合,變頻啟動(dòng)2#水泵,頻率逐漸上升,直至出水壓力達(dá)到設(shè)定壓力,依次類推增加水泵。
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