通過水泵變頻柜完成長沙恒壓供水設備與(yu)傳統的(de)(de)(de)水(shui)塔或(huo)樓頂的(de)(de)(de)高位水(shui)箱供水(shui)相比(bi)，不管(guan)是在投資與(yu)能耗(hao)方面都(dou)有明顯降低(di)(di)、而且能夠(gou)有效降低(di)(di)對(dui)水(shui)質(zhi)的(de)(de)(de)二(er)次污染的(de)(de)(de)機會少等(deng)優點，越(yue)來越(yue)多的(de)(de)(de)城(cheng)市(shi)和生(sheng)活(huo)小區(qu)已經或(huo)正打算采用(yong)變頻調(diao)速(su)恒壓供水(shui)。

變頻調速長沙恒壓供水設備工作原理是：控(kong)制(zhi)(zhi)器(qi)通過檢測(ce)實(shi)(shi)際水(shui)(shui)(shui)壓(ya)值(zhi)，比(bi)較設定水(shui)(shui)(shui)壓(ya)值(zhi)和(he)實(shi)(shi)際水(shui)(shui)(shui)壓(ya)值(zhi)的(de)(de)差別(bie)，按PID控(kong)制(zhi)(zhi)規律運算后(hou)，輸(shu)出控(kong)制(zhi)(zhi)信號至VFD，VFD則根(gen)據(ju)控(kong)制(zhi)(zhi)器(qi)的(de)(de)輸(shu)入信號調節水(shui)(shui)(shui)泵電(dian)(dian)機(ji)的(de)(de)供電(dian)(dian)電(dian)(dian)壓(ya)和(he)頻率。當用水(shui)(shui)(shui)量(liang)(liang)(liang)增加(jia)時，控(kong)制(zhi)(zhi)器(qi)控(kong)制(zhi)(zhi)VFD使(shi)電(dian)(dian)動機(ji)的(de)(de)電(dian)(dian)壓(ya)和(he)頻率加(jia)大(da)，水(shui)(shui)(shui)泵轉速升高(gao)，出水(shui)(shui)(shui)量(liang)(liang)(liang)增加(jia);當用水(shui)(shui)(shui)量(liang)(liang)(liang)減少(shao)時，控(kong)制(zhi)(zhi)器(qi)控(kong)制(zhi)(zhi)VFD使(shi)電(dian)(dian)動機(ji)的(de)(de)電(dian)(dian)壓(ya)和(he)頻率降(jiang)低，水(shui)(shui)(shui)泵轉速下降(jiang)，出水(shui)(shui)(shui)量(liang)(liang)(liang)減少(shao)。恒壓(ya)供水(shui)(shui)(shui)設備通過這種(zhong)控(kong)制(zhi)(zhi)方(fang)式，就可以使(shi)自(zi)來水(shui)(shui)(shui)管(guan)道壓(ya)力(li)保(bao)持在設定值(zhi)上。

由于VFD的價格較高，變頻調速長沙恒壓供水設備通常采用(yong)多(duo)臺(tai)水(shui)泵(beng)并聯運(yun)行(xing)(xing)，幾臺(tai)水(shui)泵(beng)共用(yong)一(yi)臺(tai)VFD。工(gong)(gong)作時，控(kong)制器(qi)根據(ju)用(yong)水(shui)量的(de)大小，控(kong)制配電系統自動選(xuan)擇所需投入運(yun)行(xing)(xing)的(de)水(shui)泵(beng)數(shu)量，一(yi)般方法是(shi)保(bao)持(chi)其中一(yi)臺(tai)水(shui)泵(beng)處于VFD控(kong)制下，其它水(shui)泵(beng)則根據(ju)供水(shui)量的(de)變化，在工(gong)(gong)頻下全速運(yun)行(xing)(xing)或停(ting)機待命。