外文文獻(xiàn)翻譯--變頻器在供水控制系統(tǒng)的應(yīng)用(完整版)
【正文】 e system used all has each time carried on the low speed to start, the high speed movement enhanced the operating efficiency. Uses the frequency changer PLC constant pressure water supply installment to have following several merits: A:The electricity saving benefit is high. The traditional water pump electrical machinery uses the large capacity electrical machinery, is constant with the valve control water volume, creates the electrical energy waste. Frequency conversion system, regardless of the operational parameter how, the electrical machinery efficiency can39。 (2) 智能化 包括兩個(gè)方面：盡量減少硬件，實(shí)現(xiàn)硬件軟件化；采用智能電力電子器件和其他智能化部件。系統(tǒng)還采用軟啟動(dòng)方式，不存在電氣沖擊，不污染電網(wǎng)，而且變頻器自帶欠壓、過(guò)壓、過(guò)流、過(guò)載、過(guò)熱以及失速等各種保護(hù)功能。系統(tǒng)的結(jié)構(gòu)如圖一所示，利用安置在的生活用水中的壓力變送器將水的壓力信號(hào)傳輸?shù)秸{(diào)節(jié)器，根據(jù)與調(diào)節(jié)器的設(shè)定值和報(bào)警上下限比較，送信號(hào)給 PLC 與變頻器，系統(tǒng)的起停泵分別由調(diào)節(jié)器的壓力下限信號(hào)和變頻器的頻率下限信號(hào)決定，假如壓力低，調(diào)節(jié)器給 PLC 一個(gè)壓力下限信號(hào)， PLC 啟動(dòng)變頻器，并使一號(hào)泵處于變頻工作狀態(tài)， 輸出的頻率逐漸增大，經(jīng)過(guò)一段時(shí)間的調(diào)節(jié)，如壓力還低，這時(shí)， PLC讓一號(hào)泵處于工頻狀態(tài)工作，使二號(hào)泵處于變頻工 作狀態(tài)泵，如壓力還低，則讓二號(hào)泵處于工頻狀態(tài)工作，使三號(hào)泵處于變頻工作狀態(tài)，如此類推。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。 變頻技術(shù)以其在節(jié)能與恒壓方面的優(yōu)越性能可以解決水壓控制系統(tǒng)存在的以上問(wèn)題。當(dāng)壓力達(dá)到調(diào)節(jié)器上限報(bào)警值時(shí)，調(diào)節(jié)器輸出降低，變頻器頻率降低，低到頻率下限設(shè)定值，這時(shí)變頻器給出一個(gè)頻率下限信號(hào)給 PLC， PLC 根據(jù)先啟先停的原則控制泵的運(yùn)行順序，例如， PLC收到頻率下限信號(hào)時(shí)， 系統(tǒng)中泵的狀態(tài)是一號(hào)工頻，二號(hào)工頻，三號(hào)變頻，這時(shí)一號(hào)泵最先啟動(dòng)，所以先停，接著如壓力還高，則停二號(hào)泵。系統(tǒng)對(duì)管網(wǎng)壓力波動(dòng)采取阻尼濾波處理，供水恒壓精度較高，通常能控制在 范圍內(nèi)。集成化是智能化的基礎(chǔ)。t reduce, the electrical machinery power factor can obtain the enhancement. B:Moves is reliable, is stable. In the system core part frequency conversion velometer itself reliability is very high, in the ordinary circumstances may the longterm usage 100,000/Above h. The system also selects the soft start method, does not have the electrical impact, does not pollute the electrical work, moreover frequency changer bringing owes presses, the pressure, the overflow, the overload, superheat as well as loses speed and so on each kind of protection function. The system adopts damping filter processing to the pipe work fluctuation of pressure, the water supply constant pressure precision is high, usually can control in the scope. C:The structure is simple, the operation is simple. The installment control system uses the integration rate to be high, necessary plan nimble diverse, obtains water pump movement each kind of bination by the programmable controller. The velocity modulation scope is broad, to water volume change adaptiveness. D:The service life is long, the automaticity is high, does not need the human to safeguard, maintains the quantity to be few. Above system the effect is remarkable in the actual application, if brings in PLC and the frequency changer the progr
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