Currently, the water level control in a large part of the electrical pumps are not towing gear shift system, no gear shift most of the electrical energy consumed in the water supply to the frequent changes in the pumps stopped. This not only makes the electrical work in inefficient zones, cut short the useful life of electrical and electrical equipment for the frequent failure to stop the high rate, leading to serious waste of water resources, system maintenance, repairs larger workload.
With high living water and industrial water gradually increased, the traditional control methods that are outdated. Originally used for artificial water level control, water level due to the lack of accurate positioning hour monitoring, it is difficult to accurately control the pumps have stopped; Using buoys or mechanical control devices such as water supply situation has made some changes, but because of mechanical failure more devices, poor reliability to maintenance will face great trouble.


目前，在水位控制中有很大一部分水泵電機(jī)是不變速拖動(dòng)系統(tǒng)，不變速電機(jī)的電能大多消耗在適應(yīng)供水量的變化而頻繁的開停水泵中。這樣不但使電機(jī)工作在低效區(qū)、減短電機(jī)的使用壽命，而且電機(jī)的頻繁開停使設(shè)備故障率很高，導(dǎo)致水資源嚴(yán)重浪費(fèi)，系統(tǒng)的維護(hù)、維修工作量較大。
隨著高位生活用水和工業(yè)用水逐漸增多，傳統(tǒng)的控制方法已經(jīng)落后。原先用人工進(jìn)行水位控制，由于無(wú)法每時(shí)每刻對(duì)水位進(jìn)行準(zhǔn)確的定位監(jiān)測(cè)，很難準(zhǔn)確控制水泵的起停；使用浮標(biāo)或機(jī)械等水位控制裝置使供水狀況有了一些改變，但由于機(jī)械裝置的故障多，可靠性差，給維修帶來(lái)很大的麻煩。