PLC变频器在恒压供水上的应用.docx

摘要建设节约型社会，合理开发、节约利用和有效保护水资源是一项艰巨任务。根据高校用水时间集中，用水量变化较大的特点，分析了供水系统存在成本高，可靠性低，水资源浪费，管网系统待完善的问题。提出以利用自来水水压供水与水泵提水相结合的方式，并配以变频器、软启动器、PLC、微泄露补偿器、压力传感器、液位传感器等不同功能等传感器变频调速，PLC，恒压供水，自动控制ABSTRACTBuildingtheconservation-orientedsociety,thereasonabledevelopment,savesandtheeffectiveprotectingwaterresourcesisanarduoustask.Becentralizedaccordingtotheuniversitywaterusedtime,thewaterconsumptionchangemajorcharacteristic,analyzedthecampusoriginalwatersupplysystemexistencecosttobehigh,thereliabilitywaslow,thewaterresourceswaste,thepipenetworksystemtreatedtheconsummationthequestion.Proposedthatdrawswaterthewaywhichusingtherunningwaterhydraulicpressurewatersupplyandthewaterpumpunifies,andmatchesbytheinverter,thesoftstarter,PLC,Microrevealsthecompensator,thepressuretransmitter,thefluidpositionsensorandsoon.accordingtothenetworkmanagementpressure,controlswaterpump'srotationalspeedthroughtheinverter,causesinwaterpipe'spressuremaintainsatthroughouttheappropriatescope,thusmaysolvetheproblemwhichthefloorhighpressureistooinsufficientwhensmallcurrentcapacitytheenergyconsumptionisbig.Moreoverthewaterpumpconsumestheelectricpowerandtheelectricalmachineryrotationalspeedisproportionalthreecubedtherelations,thereforethewaterpumpvelocitymodulationmovement'senergyconservationeffectisobvious,theaveragepowerconsumptionusualwatersupplywaysaves40%.Theunionusestheprogrammablecontroller,mayrealizethemainpumpfrequencyconversion,theauxiliarypumpsoftstart,hastheshortcircuitprotection,theoverflowprotectionfunctionstably,theworkreliable,lengthenedelectricalmachinery'sservicelifegreatly.PLC,watersupplyofconstantpressure,automaticcontrol目录摘要ABSTRACT目录第一章绪论1.1变频恒压供水产生的背景和意义1.2变频恒压供水系统的国内研究现状第二章变频恒压供水系统结构及工艺流程2.1恒压供水系统原理2.2工艺流程第三章硬件设计方案3.1主要器件选型3.1.1PLC简介3.1.2PLC的选型3.1.3变频器简介3.1.4变频器的选型3.2供水系统电气设计3.3变频器、PLC接线图及参数设置3.4PLCI/O分配表第四章软件设计方案4.1梯形图的基本绘制规则4.2程序流程图4.3程序清单总结致谢参考文献绪论1.1变频恒压供水产生的背景和意义水已经成为中国21世纪的热点问题，水有其自然属性，它既是一种特殊的、不可替换的资源，又是一种可重复使用、可再生的资源；水又有其经济和社会属性，不仅工业、农业的发展要靠水，水更是城市发展、人民生活的生命线。近年来我国中小城市发展迅速，集中用水量急剧增加。据统计，从