PLC應用于恒壓供水系統(tǒng)發(fā)布時間：13-01-21 來源： 上海智忱科技發(fā)展有限公司 點擊量：44323 更多
一、MDD090C-N-030-N2M-110PA1恒壓供水系統(tǒng)的簡介
MDD090C-N-030-N2M-110PA1恒壓供水系統(tǒng)對于生活小區(qū)是非常重要的，例如在生活小區(qū)供水過程中，若自來水供水因故壓力不足或短時斷水，可能影響居民生活。又如當發(fā)生火警時，若供水壓力不足或無水供應，不能迅速滅火，可能引起重大損失和人員傷亡。所以，生活小區(qū)采用生活 / 消防雙恒壓供水系統(tǒng)，具有較大的經(jīng)濟和社會意義。
基于上述情況，我公司對某生活小區(qū)供水系統(tǒng)進行改造，上海正航的CN系列PLC 作為主控單元，利用正航變頻器，根據(jù)系統(tǒng)狀態(tài)可快速調整供水系統(tǒng)的工作壓力，達到恒壓供水的目的。
二、MDD090C-N-030-N2M-110PA1恒壓供水控制系統(tǒng)的基本控制工藝
MDD090C-N-030-N2M-110PA1采用電動機調速裝置與可編程控制器(PLC)構成控制系統(tǒng)，進行優(yōu)化控制泵組的調速運行，并自動調整泵組的運行臺數(shù)，完成供水壓力的閉環(huán)控制，在管網(wǎng)流量變化時達到穩(wěn)定供水壓力和節(jié)約電能的目的。系統(tǒng)的控制目標是泵站總管的出水壓力，系統(tǒng)設定的給水壓力值與反饋的總管壓力實際值進行比較，其差值輸入CPU運算處理后，發(fā)出控制指令，控制泵電動機的投運臺數(shù)和運行變量泵電動機的轉速，從而達到給水總管壓力穩(wěn)定在設定的壓力值上。恒壓供水就是利用變頻器的PID或PI功能實現(xiàn)的工業(yè)過程的閉環(huán)控制。即將壓力控制點測的壓力信號(4-20mA)直接輸入到變頻器中，由變頻器將其與用戶設定的壓力值進行比較，并通過變頻器內(nèi)置PID運算將結果轉換為頻率調節(jié)信號調整水泵電機的電源頻率，從而實現(xiàn)控制水泵轉速。供水系統(tǒng)選用原則是水泵揚程應大于實際供水高度，水泵流量總和應大于實際最大供水量。
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