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1、毕业设计(论文)外文翻译专业：自动化姓名：刘延波班级：0745学号：15指导教师:于静职称：讲师2011年5月外文翻译ThesupervisingsystemofelevatorbaseonPLC1.NessiceryofthecomtentandgeneralsituationCominginto90’s,withthedevelopmentoftechnologyandtheabroadapplicationofcomputer,peoplerequiremoresecureandreliableoftheelevator,t
2、hefailingofrelaycontrolbecomesmoreevident.PLChasdevelopedbasingontheneedoftheorderlogicalcontrol,itisaelectronicdeviceofnumeraloperation.Whereasitsvarietyvirtue,nowtherelaycontrolmodehasbeenreplacedbyPLCgraduallyatthesametime,becauseofthedevelopmentofthetechnologyhasg
3、raduallytransitedtoACfrequencyconversionspeeding.SothetechnologyofPLCaddingfrequencyspeedinghasbecameonehotspotinmodernelevatorindustry.PLCisaexpertcomputerusingforautomaticcontrol,virtuallyitbelongstocomputercontrolmode.PLCcontrolcommonlyhassuchpointashighreliability
4、、easytooperate、simpletomaintainandprogram,strongagilityandsoon.UsingPLCcontrolandsoftwaretorealizeauto-controlofelevator,reliabilityisimprovedgreatly.Structureofthesystemissimpleanditsexternallineispredigested,Inaddition,thefunctioncanbeincreasedorchangedexpendently.A
5、lsotroublecanbeautomaticcheckedandalarmingcanbeshowed,securityofmovingisimprovedandexaminingandrepairingisconvenient.Withtherapiddevelopmentofelectronictechnology,micro-electronictechnologyandcomputertechnology,thedevelopmentofAcfrequencyconversionspeedingisalsorapid,
6、TheACfrepuencyconversionspeedingofelectromotorisamainmeasureofsavingelectricity、improvingartsandcraftsflowtoimprovequalityoftheproduct、amendingcircumstanceanddrivingtechnologytogo-ahead.Frequencyconversionspeedingisconsideredhavingdevelopingfuturebestofallbecauseofits
7、excellenttimingcapabilityandstartingandstoppingcapability,highefficiency,highpowerfactorandaffectionofsavingelectricity,broadapplyingrangeandothermanystrongpoint.ElevatorofFrequencyconversionspeedingusingadvancedSPWM9外文翻译technology,amendsmovingqualityandcapabilityofel
8、evatorapparently,itstimingrangeisvastandprecisionishigh,dynamicofelevatorapparently,itstimingrangeisvastandprecisionishigh,d
