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1、河北建筑工程学院毕业设计（论文）外文资料翻译系别：电气系专业：电气工程及其自动化班级：电控071姓名：贾旭学号：2007308112外文出处：http://dq.shejis.com/附件：1、外文原文；2、外文资料翻译译文。指导教师评语：签字：年月日1、外文原文DriveinWaterSupplySystemAbstract:Thisdesignuses"morethanawaterpumpconvertercontrol,"themulti-pumpcontrolsystem.HeretheusePLCtodesignafreque
2、ncycontrolwatersupplysystem,whichthenetworkcanautomaticallyadjusttheinstantaneouspressurechangesthespeedofawaterpumpandpumpmorethanoneinputandexit,sothattheoutletpipenetworkbackbonetokeepinconstantthesetpressurevalue,andmeettheuser'sflowrequirements,sothatthewholesystemi
3、salwaysbesttokeepenergyefficient.Constantpressurevariablecanberealized,twoothercontrolvariablesconstant,avarietyofstart-stopcontrolmode,thesystemcanmodifytheparametersofanycommand(suchasthepressuresetting,thecontrolorder,controlthemotornumber,thepressureonthelowerlimit,P
4、IDvalues,accelerationanddecelerationtime);hasacompleteelectricalsafetyprotectionmeasures,overcurrent,overvoltage,undervoltage,overload,withoutwaterandsocanself-diagnosisandfaultalarm. Toensurenormalwatersupplyarea,theuseofPLCcontrolfrequencycontrolwatersupplysystem,acc
5、ordingtotheneedsofuserson-demandwaterpumpflowadjustment,accordingtolesswateratnightcanonlyopenasmallflowpump,andtomeettrafficdemandsofusers,sotruealwaysmaintainasystemofenergy-efficientbest.Keywords:InverterWaterSupplyPLCBody:Withtherapidsocialandeconomicdevelopment,urba
6、nconstructionexpandingthesizeofthepopulationincreaseandrisinglivingstandardsofurbanwatersupplyquantity,quality,stability,higherandhigherrequirements.SmallandmediumcitiesinChina,especiallytheoldwaterplantwaterplantautomaticcontrolsystemconfigurationisrelativelybackward,th
7、econtrolunitdependsondutypersonnelmanual.Controlprocesscumbersome,butcannotmanuallycontrolthepressureofthewatersupplynetworkandwaterlevelchangesinatimelymannertorespondappropriately.Toensurethewatersupply,ofteninover-pressureconditionunitrunning,notonlylowefficiency,powe
8、rconsumption,andalongperiodofChengshiguanwangoverpressurerunning,exposureisalsoveryseriousloss[7],const
