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1、摘要随着我国社会经济的发展,住房制度改革的不断深入,人们生活水平的不断提高,城市中各类小区建设发展十分迅速,同时也对小区的基础设施建设提出了更高的要求。小区供水系统的建设是其中的一个重要方面,供水的经济性、可靠性、稳定性直接影响到小区住户的正常生活和工作,也直接体现了小区物业管理水平的高低。传统的恒速泵加压供水,水塔高位水箱供水,气压罐供水等供水方式普遍不同程度的存在效率低、可靠性差、自动化程度不高等缺点,难以满足当前经济生活的需要。本论文针对某住宅小区的供水要求,设计了一套由PLC,变频器,多台水泵机组等主要设备构成的全自动变频恒压供水系统,具有全自动变频恒压运
2、行,自动工频运行,系统有效地解决了传统供水方式中存在的问题,增强了系统的可靠性。并和计算机实现了有机的结合,提升了系统的总体性能.论文论述了采用多泵并联供水方案的合理性,分析了多泵供水方式的各种供水状态及转换条件,分析了电机由变频转工频运行方式的切换过程。给出了实现有效状态循环转换控制的电气设计方案和PLC控制程序设计方案。关键词：恒压供水;PLC;变频调速ABSTRACTAlongwiththedevelopmentofthesocio—economyofourcountrythehousingsystemisgoingdeepintoreforms,andpe
3、ople'slivingstandardisbeingimpr0Ved.Atthesametime,inthecity,eachkindofsub—districtconstructionisdevelopingVeryquickly,whichputsf10rwardhigherrequirementfortheinfrastructureconstructionofsub-district.Andtheconstructionofsub-districtwatersupplysystemisanimportantaspectinwhich.Thereality
4、stabilityandeconomyofwatersupplydirectlyaffectssub—districthousehold’snormallifeandwork,andalsoembodiesthedifferenceinthelevelofsub-districtpropertymanagement.Thetraditionalmeansofwatersupplysuchasthepumppressurizationwatersupplyatconstantspeed,watertowerofuppercistern,thejaretc.areha
5、rdtosatisfytheneedsofareeconomiclife,becauselowefficiency,reliabilityandautomationlevelallcommonlyexistinginthesemeans.AccordingtotherequirementofwatersupplyinabidingplaceofLanZhou,asetofautomaticsystemofconstantpressurewatersupplybyusingcomposedvariablefrequencyandremotemonitoringand
6、controlling,whichiscomposedofPLC,transducerpressureelectro—motors,computeranddeviceofcommunicationisdesignedtoconstantthatend.ThissetofsystemhasthefunctionslikeautomaticconstantpressureoperationbyusingVariablefrequency,automaticworkfrequencyoperation,andthefunctionoflong-rangecontrolb
7、yhandandtheon-the—spotcontrolbyhandetc.Thesystemhassolvedefficientlytheproblemexistinginthetraditionalwayofwatersupply,whichhasvarioussupplementaryfunctionstostrengthenthereliability.Thesystemhasanorganiccombinationwithcomputerandpromotesthesystematicoverallperformance.Thispaperdiscus
8、sesth
