描述

3.2恒壓供水的控制原理

SAMISTAR變頻器具有REMOTE和LOCAL兩種操作方式。LOCAL操作方式下，通過LOCALSTART/STOP開關(guān)啟停變頻器，通過fREFLOCALINPUT0輸入端口的電位開關(guān)人工調(diào)節(jié)變頻器工作頻率；通過LOCAL/REMOTE輸入點(diǎn)可以將變頻器切換到REMOTE操作方式下，在REMOTE方式下，通過REMOTESTART/STOP輸入點(diǎn)進(jìn)行PLC遠(yuǎn)程啟停變頻器，通過fREFREMOTEINPUT0端口輸入頻率控制信號(hào)（百分比）控制變頻器工作頻率。根據(jù)供水量情況，我們把變頻器的工作頻率上限設(shè)定為水泵基頻，即頻率變化范圍控制在0~50Hz，在此范圍內(nèi)水泵運(yùn)行頻率和定子相壓成正比（及與變頻器輸入頻率成正比），這使得變頻器輸入、水泵運(yùn)行頻率和泵的輸出壓力成較好的線形關(guān)系，可得到較好的控制效果。SAMISTAR變頻器對用戶開放的I/0接口位于TERMINALBLOCKCARD上，主要使用的有：X11-1（REMOTESTART/STOP）；X11-4（LOCAL/REMOTE）；X11-13/14（fREFREMOTEINPUT0、4~20mA信號(hào)輸入）；X11-15/16（輸出4~20mA變頻器運(yùn)行頻率信號(hào)）；X11-17/18（輸出4~20mA變頻泵運(yùn)行電流信號(hào)）。變頻器由PLC遠(yuǎn)程控制時(shí)，啟動(dòng)是由PLC向X11-4輸出信號(hào)，使變頻器切換到外部設(shè)備控制方式（REMOTE方式），再向X11-1輸出信號(hào)，啟動(dòng)變頻器。在恒壓調(diào)節(jié)時(shí)，PLC處理器把檢測到的壓力信號(hào)作為反饋值，與PID運(yùn)算的壓力設(shè)定值（由調(diào)度人員根據(jù)情況在REView上設(shè)定）進(jìn)行比較，再經(jīng)過PID運(yùn)算得到調(diào)節(jié)后的修正值，通過模擬量輸出模板（1771-OFE）輸出到X11-13/14，作為REMOTE方式下變頻器的頻率控制信號(hào)，由于該信號(hào)是相對變頻器工作頻率上限的百分比，所以變頻器將輸入信號(hào)進(jìn)行內(nèi)部運(yùn)算后轉(zhuǎn)為真實(shí)工作頻率。

為了使三期變頻恒壓供水自動(dòng)控制系統(tǒng)與全廠自動(dòng)控制網(wǎng)絡(luò)有機(jī)地結(jié)合起來，全面實(shí)現(xiàn)對恒壓供水系統(tǒng)的運(yùn)行情況和設(shè)備運(yùn)行進(jìn)行監(jiān)視和遠(yuǎn)程控制，更加安全可靠地實(shí)現(xiàn)恒壓供水，我們使用PLC進(jìn)行PID運(yùn)算和監(jiān)控

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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