三、MDD093C-N-060-N2L-110GL0恒壓供水系統(tǒng)的控制要求
小區(qū)變頻恒壓供水系統(tǒng)采用一臺變頻器拖動四臺0.75KW功率電動機，可在變頻和工頻兩種方式下運行。用戶通過人機界面對水壓設(shè)定，并可通過觸摸屏對電極轉(zhuǎn)速，頻率，運行狀態(tài)和水壓等參數(shù)進行監(jiān)視。
MDD093C-N-060-N2L-110GL0啟動方式：為避免啟動時的沖擊電流，電機采用變頻啟動方式，從變頻器的輸出端得到逐漸上升的頻率和電壓。啟動前變頻器要復(fù)位。
變頻調(diào)速：根據(jù)供水管網(wǎng)流量、壓力變化自動控制變頻器輸出頻率，從而調(diào)節(jié)電動機和水泵的轉(zhuǎn)速，實現(xiàn)恒壓供水。如設(shè)備的輸出電壓和頻率上升到工頻仍不能滿足供水要求時，PLC發(fā)出指令1號泵自動切換到工頻電源運行，待1號泵完全退出變頻運行，對變頻器復(fù)位后，2號泵投入變頻運行。
MDD093C-N-060-N2L-110GL0多泵切換：根據(jù)恒壓的需要，采取無主次切換，即“先開先停”的原則接入和退出。在PLC的程序中，通過設(shè)置變頻泵的工作號和工頻泵的臺數(shù)，由給定頻率是否達到上限頻率或下限頻率來判斷增泵或減泵。在用水量較小的情況下，采用輔助泵工作。
為了避免一臺泵長期工作，任一泵不能連續(xù)變頻運行超過3小時。當(dāng)工頻泵臺數(shù)為零，有一臺運行于變頻狀態(tài)時，啟動計時器，當(dāng)達到3小時時，變頻泵的泵號改變，即切換到另一臺泵上。當(dāng)有泵運行于工頻狀態(tài)，或輔助泵啟動時，計時器停止計時并清零。
故障處理：能對水位下限，變頻器、PLC故障等報警。PLC故障，系統(tǒng)從自動轉(zhuǎn)入手動方式。
監(jiān)控程序：系統(tǒng)主窗體四個按鈕控件，分別為參數(shù)設(shè)置、實時監(jiān)測、啟動和關(guān)閉系統(tǒng)。用戶可根據(jù)實際情況修改壓力設(shè)定值。
四、MDD093C-N-060-N2L-110GL0主要控件功能包括:
(1) 壓力設(shè)定值：壓力設(shè)定值范圍:0.30-0.60Mpa。
(2) 校正系數(shù)：主要是對壓力顯示進行校正，使壓力顯示與壓力表顯示一致。
(3) 復(fù)位按鈕：運行中按下，將使系統(tǒng)重新啟動，各參數(shù)回到初始設(shè)置。
(4) 設(shè)定按鈕：在文本框輸入壓力設(shè)定值和校正系數(shù)后，按下此按鈕，壓力設(shè)定值和校正系數(shù)才能通過串口發(fā)送給下位機。
----商務(wù)熱線---廈門興銳達自動化設(shè)備有限公司
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