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I摘要本设计是专门对日常用水而设计的恒压供水控制系统。根据国内外的研究现状以及系统的控制要求，制定出了一套适合此系统的控制方案。控制方案中，硬件设计主要对可编程控制器（PLC）机型、变频器机型以及电机泵组的机型做出了选择，同时还对系统的输入输出点进行了规划和分配。在软件设计部分，针对控制要求画出了系统的流程图，并且还对每一部分的流程图进行了功能的解释，使读者能更加轻松的了解整个系统的软件设计情况。在此课题中，还采用了MCGS组态软件，对控制系统进行监视与模拟运行，很直观的再现了现场的实际情况。最后，还对整个系统进行了运行调试，运行结果表明该系统具有水压稳定、硬件组成简单、运行可靠和操作方便等优点。关键词：恒压供水；可编程控制器；变频器；组态软件IIAbstractThisdesignisspeciallydesignedforwaterconstantpressurewatersupplycontrolsystem.Accordingtotherequirementsofthecurrentresearchathomeandabroadandthesystemcontrol,developasetofcontrolschemesuitableforthesystem.Inthecontrolscheme,thehardwaredesignismainlytotheprogrammablelogiccontroller(PLC)model,frequencyconverterandmotorpumpsetmodelmadeachoice,butalsoonthesysteminputandoutputpointsofplanningandallocation.Insoftwaredesignpart,accordingtodrawtheflowchartofthesystem,andtherequiredcontrolandflowchartofeverypartofthefunctionofexplanation,sothatreaderscanmoreeasilyunderstandthesoftwaredesignofthewholesystem.Inthistopic,alsoadoptedtheMCGSconfigurationsoftware,tomonitorandcontrolsystem’ssimulate,intuitivereproducetheactualsituationofthescene.Finally,thedebuggingofthewholesystemrunning,theresultsonthesurfaceofthesystemhasstablepressure,simplestructure,reliableoperationandconvenientoperation.Keywords:Constantpressurewatersupply；ProgrammablelogicController；Inverter；ConfigurationsoftwareIII目录摘要....................................................................................................................IAbstract................................................................................................................II目录.....................................................................................................................III第一章绪论.........................................................................................................11.1本课题的目的及研究意义...........................................................................................21.2恒压供水系统的国内外研究现状...............................................................................21.3恒压供水系统的控制要求...........................................................................................3第二章恒压供水控制系统方案论证.................................................................42.1恒压供水控制系统分析...............................................................................................42.2恒压供水控制方案比较...............................................................................................42.3供水方式与控制方案的选择.......................................................................................5第三章恒压供水控制系统的硬件设计.............................................................63.1恒压供水控制系统设备选型.......................................................................................63.1.1PLC机型的选择.................................................................................................63.1.2变频器机型的选择............................................................................................63.1.3电动机机型的选择............................................................................................83.1.4水泵机型的选择................................................................................................83.2PLC输入输出接点分配...............................................................................................93.3PLC中内部触点的分配...............................................................................................93.4PLC输入输出接线原理图设计...................................................................................93.5系统控制流程图的设计.............................................................................................11第四章恒压供水系统程序设计.......................................................................134.1电机启动的介绍说明.................................................................................................134.1.1程序的准备与启动..........................................................................................134.1.2电动机工频与变频状态切换的流程图与梯形图..........................................144.1.3七段速度切换的流程图与梯形图..................................................................164.2工变频电机的满载与防负压运行.............................................................................214.3电机过载报警.............................................................................................................21第五章MCGS组态软件的简介与运用..........................................................22IV5.1MCGS组态软件简介.................................................................................................225.2MCGS组态软件界面模型的建立.............................................................................235.3MCGS数据库及设备窗口参数的建立.....................................................................245.3.1MCGS实时数据库的建立...............................................................................245.3.2MCGS设备窗口参数的建立...........................................................................255.4恒压供水系统的MCGS与PLC联机调试..............................................................27第六章控制系统程序的调试...........................................................................286.1系统运行调试...............