【正文】 的方式，因此投資成本較高，不利于系統(tǒng)的大規(guī)模使用和發(fā)展。隨著科學(xué)技術(shù)的不斷發(fā)展，恒壓供水控制系統(tǒng)中的 變頻 器作為執(zhí)行機(jī)構(gòu)，在供水量大小需求不同時(shí)，為了保證管網(wǎng)壓力恒定，在管網(wǎng)終端配備壓力控制器和壓力傳感器，從而實(shí)現(xiàn)對(duì)壓力的閉環(huán)控制?；?PLC 的恒壓供水控制系統(tǒng)更是的到了廣泛的應(yīng)用。 攀枝花學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 緒論 1 1 緒論 前景 隨著社會(huì)經(jīng)濟(jì)的迅速發(fā)展，水對(duì)人民生活與工業(yè)生產(chǎn)的影響日益加強(qiáng)，人民對(duì)供水的質(zhì)量和供水系統(tǒng)可靠性的要求 也 不斷提高。系統(tǒng)可靠性高、經(jīng)濟(jì)性強(qiáng)。系統(tǒng)設(shè)定的給水壓力值與反饋的總管壓力實(shí)際值進(jìn)行比較，其差值輸入 PLC運(yùn)算處理后，發(fā)出控制指令，控制電動(dòng)機(jī)的轉(zhuǎn)速，從而達(dá)到給水總管壓力穩(wěn)定在設(shè)定的壓力值上。通過(guò)研究和比較，本論文采用變頻 器和 PLC實(shí)現(xiàn)恒壓供水，對(duì)系統(tǒng)的硬件設(shè)計(jì)進(jìn)行了詳細(xì)的介紹，然后用數(shù)字 PID對(duì)系統(tǒng)中的恒壓控制進(jìn)行設(shè)計(jì)。 攀枝花學(xué)院 本科畢業(yè)設(shè)計(jì)（論文） 摘要 I 摘 要 高層樓宇恒壓供水控制系統(tǒng)具有運(yùn)行穩(wěn)定可靠，占地面積小，節(jié)電節(jié)水，自動(dòng)化程度高，操作控制方便等特點(diǎn)，這對(duì)于樓宇節(jié)能降耗、提高經(jīng)濟(jì)效益和保障設(shè)備安全、穩(wěn)定運(yùn)行具有現(xiàn)實(shí)意義。 本論文通過(guò)分析恒壓供水控制系統(tǒng)的原理，系統(tǒng)的組成結(jié)構(gòu)及不同的控制方案，設(shè)計(jì)出更切合實(shí)際需要的恒壓供水控制系統(tǒng)。 恒壓供水控制系統(tǒng)的基本控制策略是：采用電動(dòng)機(jī)調(diào)速裝置與可編程控制器（ PLC）構(gòu)成控制系統(tǒng) ，完成供水壓力的恒定控制，使管網(wǎng)流量變化達(dá)到穩(wěn)定供水壓力的目的。 該系統(tǒng)能夠?qū)┧^(guò)程進(jìn)行自動(dòng)控制，能夠有效地降低能耗，保證了供水系統(tǒng)維持在最佳運(yùn)行狀況，提高了生產(chǎn)管理水平。 關(guān)鍵 詞 變頻 調(diào)速，恒壓供水， PLC 攀枝花學(xué)院本科畢業(yè)設(shè)計(jì)（論文） ABSTRACT II ABSTRACT Frequency control water supply system has a stable and reliable operation, small footprint, power saving, high degree of automation, convenient control features, which improve the economic and security equipment for building energy saving, safe and stable operation withpractical significance. The paper through the analysis of the principle of frequency control water supply control system, the system structure and different control schemes to design more in line with the actual needs of the constant pressure water supply control system. Through research and parison, the paper inverter and PLC constant pressure water supply, carried out a detailed introduction to the hardware design of the system, and then use the digital PID constant voltage control system design. The basic control strategy of constant pressure water supply control system: the use of a motor speed control device with programmable controller (PLC) control systems, constant water pressure control, the purpose of a stable water supply pressure changes in the pipe work traffic. Explorer pressure of the water supply pressure and feedback system set actual value parison, the difference between the input PLC operation processing, issue control instructions to control the speed of the motor, so as to achieve the water mains pressure stabilized at the set pressure value. The system is capable of automatic control of the water supply process, which can effectively reduce power consumption, to ensure the water supply system is maintained at the optimum operating conditions to improve the production management level. System reliability is high, the economy is strong. Key word Speedfrequency variable， Constant pressure water supply， PLC 攀枝花學(xué)院本科畢業(yè)設(shè)計(jì)（論文） 目錄 III 目 錄 摘 要 ..................................................................................................................................I ABSTRACT .................................................................................................................... II 1 緒論 ................................................................................................................................1 ........................................................................................................................1 國(guó)內(nèi)外研究概況 ......................................................................................................1 恒壓供水工藝圖 ......................................................................................................2 2 高層樓宇恒壓供水系統(tǒng)整體設(shè)計(jì) ...............................................................................3 變頻恒壓供水系統(tǒng)的組成及原理圖 ..........................................................................3 變頻恒壓供水系統(tǒng)控制流程 ....................................................................................5 水泵切換條件分析 ..................................................................................................5 3 系統(tǒng)的硬件設(shè)計(jì) ...........................................................................................................8 系統(tǒng)主要設(shè)備的選型 ...............................................................................................8 PLC及其擴(kuò)展模塊的選型 .................................................................................8 系統(tǒng)主電路分析及其設(shè)計(jì) ........................................................................................9 系統(tǒng)控制電路分析及其設(shè)計(jì) .................................................................................. 11 PLC的 I/O端口分配及外圍接線(xiàn)圖 ......................................................................... 13 4 系統(tǒng)的軟件設(shè)計(jì) ......................................................................................................... 16 系統(tǒng)軟件設(shè)計(jì)分析 ................................................................................................ 16 PLC程序設(shè)計(jì) ........................................................................................................ 17 ...................................................................................... 17 控制系統(tǒng)子程序設(shè)計(jì) ...................................................................................... 20 PID控制器參數(shù)整定 .............................................................................................. 23 PID控制及其控制算法 ................................................................................... 23 PID的參數(shù)整定 ...........................................................................................