I基于PLC的中央空调水泵变频调速控制系统设计摘要随着人们生活质量的普遍提高以及科学技术的不断进步，中央空调也逐渐进入了人们的视野，成为人们生活中重要的一部分，同时它所消耗的能量也引起了社会的关注，中央空调的节能问题成为了人们期待解决的关键问题。中央空调采用的变频技术从一定程度上极大地减少了能量的损耗，采用变频调速后，一方面成功的实现了电动机的软启动，在另一方面也减弱了振动和磨损，增长了电动机的寿命。中央空调水泵变频技术是中央空调节能降耗的一个有效途径，而且也得到国家政策的支持，代表了今后空调行业节能技改的方向。这次所做的方案主要就是通过西门子S7-200系列的CPU226作为控制元件来研究并且设计中央空调水泵变频调速控制系统。该设计论文将会叙述变频器和可编程控制器的工作原理，完成变频器、可编程控制器等的选型和参数设置，重点完成PLC硬件电路图和程序设计。中央空调水泵变频调速控制系统的经济性十分可观，将会具有很好的前景和开阔的市场。该论文有图43幅，表1个，参考文献31篇。关键词：中央空调变频调速可编程控制器CentralAirconditioning’sWaterPumpFrequencyControlofMotorSpeedControlSystemDesignBasedonPLCIIAbstractWiththecontinuousprogressinscienceandtechnologyandimprovementofthequalityoflife,thecentralairconditioninghasgraduallyenteredthepeople'svision,whichhasbecomeanimportantpartofpeople’slife.Atthesametime,theenergyitconsumesalsocausedconcerninthecommunity.Theenergysavingproblemofcentralair-conditioninghasbecomethekeyproblemthatpeopleexpecttosolve.Centralair-conditioningsystemwhichisbasedonvariablefrequencytechnologyinacertainextentgreatlycanreduceenergyconsumption.,Itadoptsspeed-adjustedsystemthroughfrequencyconversion,whichontheonehandbringsthesuccessofthemotorsoftstart,andontheotherhandwhichalsoreducethevibrationandabrasionandprolongsthelifeofthemotor.Centralair-conditioningpumpvariablefrequencytechnologyisaneffectivewaytosaveenergy.Moreover，ithasgetthesupportofnationalpolicyandithasbeenonbehalfofthefuturedirectionofenergy-savingair-conditioningindustrytechnical.ThisgraduationdesignismainlydesignedbySiemensS7-200cpu226whichisusedtocontrolelementfortheresearchanddesignofcentralairconditioningwaterpumpfrequencycontrolofmotorspeedcontrolsystem.Thedesigninthisthesiswillexplainstheprinciple,modelselectionandparameterdesignoftheconverterandtheprogrammablecontroller.ThedesignwillfocusonthecompletionofPLChardwarecircuitdiagramandprogramdesign.Theeconomyofthecentralairconditioningwaterpumpfrequencyconversionspeedcontrolsystemisveryconsiderablewhichwillhaveaverygoodprospectandopenmarket.KeyWords:CentralAirConditioningVariableFrequencySpeedControlProgrammableControllerIII目录摘要.............................................................IAbstract...........................................................II目录...........................................................III1绪论..............................................................11.1设计中央空调变频调速系统的意义...............................11.2变频调速技术的简单介绍......................................11.3本文的主要工作..............................................21.4本章小结....................................................32中央空调系统方案.................................................42.1中央空调系统构成.............................................42.2中央空调变频控制系统的PID构架...............................42.3总体设计方案的确定...........................................52.4本章小结................................................
