007-2002-02
007-2002-02
007-2002-02

　采用變頻器實(shí)現(xiàn)恒壓供水已經(jīng)算不上是新穎的應(yīng)用，在自動(dòng)控制領(lǐng)域這也算不上新課題，但是大多數(shù)恒壓供水都是采用PLC 邏輯編程，使用變頻器控制電機(jī)變頻調(diào)速來(lái)實(shí)現(xiàn)恒壓供水。本文詳細(xì)介紹PowerFlex 400交流變頻器在無(wú)需PLC控制器的情況下，完實(shí)現(xiàn)恒壓供水的應(yīng)用，將恒壓供水這種典型的應(yīng)用低成本化、益化。
　　二、解決方案說(shuō)明：
　　在制定方案的選擇上，本著節(jié)約能源、控制簡(jiǎn)單、應(yīng)用方便的原則。該方案以恒壓變頻供水為控制核心，利用變頻器的變頻控制實(shí)現(xiàn)的恒壓變頻控制系統(tǒng)。
　　主要優(yōu)點(diǎn)：
　　1. 無(wú)需PLC 控制器，變頻器獨(dú)立完成變頻、工頻之間的接觸器切換;
　　2. 采用AB變頻器實(shí)現(xiàn)變頻調(diào)速和PID整定調(diào)節(jié);
　　3. 電機(jī)的變頻控制與工頻控制之間可以周期性自動(dòng)切換;
　　4. 對(duì)于電機(jī)設(shè)備可能出現(xiàn)的異?；蚴枪收希鞠到y(tǒng)提供較好的備用處理方式：
　?、僮冾l器故障時(shí)，可以切換到工頻直接啟動(dòng)電機(jī);
　?、陔姍C(jī)故障時(shí)，可以切換到備用電機(jī)(3#電機(jī)為備用電機(jī))，繼續(xù)正常工作。
　　三、解決方案核心設(shè)備清單：
變頻器介紹:
　　羅克韋爾自動(dòng)化旗下艾倫-布拉德利PowerFlex400變頻器擁有眾多內(nèi)置特性支持變頻器與樓宇控制系統(tǒng)之間的無(wú)縫連接，大大方便了風(fēng)機(jī)和泵類在商業(yè)領(lǐng)域的應(yīng)用。本系統(tǒng)中主要應(yīng)用PowerFlex 400變頻器的以下功能特點(diǎn)：
　　5.1 PowerFlex 400變頻器自帶兩路模擬量輸入，兩路模擬量輸出;解決方案拓展討論：
　　7.1 本方案只以2臺(tái)電機(jī)變頻、工頻自動(dòng)切換為主，介紹PowerFlex 400在恒壓供水應(yīng)用中的優(yōu)勢(shì)。實(shí)際上，在配置了輔助繼電器卡后，多可以實(shí)現(xiàn)4臺(tái)電機(jī)的切換控制;
　　7.2 本方案中變頻器在啟動(dòng)2#工頻電機(jī)時(shí)，對(duì)管道壓力會(huì)有一個(gè)波動(dòng)產(chǎn)生，對(duì)此可以通過(guò)變頻器內(nèi)部的基準(zhǔn)值補(bǔ)償?shù)姆椒?，控制這種波動(dòng)的影響到;
　　7.3 單獨(dú)變頻器實(shí)現(xiàn)恒壓供水的控制方案有別于其方案，無(wú)須邏輯編程。在方案實(shí)施過(guò)程中，要注意各個(gè)接觸器之間的連鎖控制，否則可能會(huì)造成設(shè)備的損壞。
　　八、結(jié)束語(yǔ)
　　變頻器PowerFlex 400實(shí)現(xiàn)的恒壓供水控制系統(tǒng)有著低成本、益、簡(jiǎn)單易用的優(yōu)勢(shì)，無(wú)需復(fù)雜的邏輯編程。
　　本文介紹的PowerFlex 400變頻器的這一典型應(yīng)用更突出了它的水泵應(yīng)用的靈活性、性。這一特性為它在同行業(yè)的應(yīng)用提供了可靠地實(shí)用案例和寶貴經(jīng)驗(yàn)。

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