包括論文，cad圖紙，外文翻譯

摘要
    本論文根據(jù)中國城市小區(qū)的供水要求，設(shè)計了基于PLC的變頻恒壓供水系統(tǒng)，并利用組態(tài)軟件開發(fā)良好的運行管理界面，恒壓變頻供水系統(tǒng)主要有可編程控制器，變頻器，水泵機(jī)組、壓力傳感器等組成。PLC的程序編制，調(diào)試和運行監(jiān)控，人機(jī)界面的組態(tài)均在Step/Micro編程環(huán)境下完成。
　　
　　　本系統(tǒng)由四臺水泵電機(jī)，它們組成變頻循環(huán)工作方式，采用變頻器實現(xiàn)對四臺水泵電機(jī)的軟起動和變頻調(diào)速，運行采用"先啟先?！暗墓ぷ鞣绞?，壓力傳感器檢測當(dāng)前水壓信號，送入PLC與預(yù)先設(shè)定的壓力值進(jìn)行PID運算，來控制變頻器的輸出電壓和頻率，進(jìn)行改變水泵電機(jī)的轉(zhuǎn)速來改變供水量，來保證網(wǎng)管壓力穩(wěn)定在設(shè)定值附近，采用組態(tài)軟件來完成系統(tǒng)監(jiān)控，實現(xiàn)運行狀態(tài)的顯示及數(shù)據(jù)和報警的查詢。
　　　
關(guān)鍵詞：PLC  變頻器  組態(tài)軟件  恒壓供水  變頻調(diào)速

ABSTRACT
      According to he requirement of China's urban water supply, this paper designs a set of water supply system of frequency control of constant voltage based on  PLC,and have developed good operation management interface using SupervisionControl and DataAcquisition .the is made up of PLC ,transducer,units of pump,pressure sensor and control machine and so on,The PLC program,monitoring and configuration of HMI are fully by Step7/Micro.
      This  system is formed by four pump generators and they form the circulating run mode of frequency conversion. With general frequency control ,operation switch adopts the principle of start first stop first ." The detection signal of pressure sensor of hydraulic pressure ,via PLC with set value by carry out PID comparison operation,so ,control frequency and the export voltage converter ,and then the rotational speed that changes pump generator come to change water supply quantity ,eventually ,it is nearby to maintain pipe net pressure to stabilize when set value ,Through work control machine the connection with PLC,with group form software consummately systematic monitoring ,have realized operation state development to show and data ,report to the police inquiry.

Key words:   PLC   Inverter   King view   Constant pressure of water   Variable velocity variable frequency

目錄

一 緒論 1
1.1研究背景 1
1.2設(shè)計思想 3
二 系統(tǒng)的理論分析及方案的確定 5
2.1 設(shè)計任務(wù)及要求 5
2.2控制方案的確定 6
2.3供水系統(tǒng)的控制流程 11
3水泵機(jī)組選型 15
3.1選型基本要求 15
3.2容量的確定 15
3.3水泵型號確定 18
4 變頻器的選型 21
4.1 變頻器簡介 21
4.2  變頻器的確定 21
4.3 變頻器外圍設(shè)備選擇 25
5 可編程控制器(PLC) 28
5.2 PLC的工作原理 30
5.3 PLC及壓力傳感器的確定 30
6變頻器與PLC的連接及設(shè)定 31
6.1、I/O分配和變頻器參數(shù)設(shè)置： 31
6.2控制電路外圍接線： 33
7系統(tǒng)軟件的設(shè)計 39
7.1  PLC控制程序設(shè)計 39
7.2主程序圖及程序設(shè)計 41
八 總結(jié) 55
致  謝: 57
中文翻譯 59
外文文獻(xiàn) 64