PLC在加热炉温控制系统中的应用外文翻译.docx

PLC在加热炉温控制系统中的应用外文翻译.docx

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PLC在加热炉温控制系统中的应用外文翻译

电子与信息工程学院

本科毕业论文（设计）

开题报告

论文题目：

PLC在加热炉温控制系统中的应用

学生姓名：

学号：

专业：

指导教师：

2012年11月

外文翻译

译文：

ＰＬＣ　Ｔｅｍｐｅｒａｔｕｒｅ　Ｃｏｎｔｒｏｌ　ｏｆ　ａｎ　Ｅｌｅｃｔｒｉｃ　Ｈｅａｔｉｎｇ　Ｆｕｒｎａｃｅ　

Ａｂｓｔｒａｃｔ：

Ｔｈｉｓ　ｐａｐｅｒ　ｉｎｔｒｏｄｕｃｅｓ　ａ　ｔｅｍｐｅｒａｔｕｒｅ　ｃｏｎｔｒｏｌ　ｓｙｓｔｅｍ　ｆｏｒ　ｆｉｎ　ｅｌｅｃｔｒｉｃ　ｈｅａｔｉｎｇ　ｆｕｍａｃｅ　ｂａｓｅｄ　ｏｎ　ｔｈｅ　ＰＬＣ　ｔｅｃｈｎｏｌｏｇｙ　ａｎｄ　ｔｈｅ　ｅｌｅｃｔｒｏｎｉｃ　ｒｅｃｔｉｆｉｅｒ　ｔｅｃｈｎｏｌｏｇｙ．ｙ．Ｔｈｅ　ｈａｒｄｗａｒｅ　ａｎｄ　ｓｏｆｔｗａｒｅ　ｏｆ　ｔｈｅ　ｓｙｓｔｅｍ　ａｒｅ　ａｌｓｏ　ｏｕｔｌｉｎｅｄ．

Ｋｅｙｗｏｒｄ：

ｐｒｏｇｒａｍｍａｂｌｅ　ｌｏｇｉｃ　ｃｏｎｔｒｏｌｌｅｒ；ｈｅａｔｉｎｇ　ｆｕｒｎａｃｅ；ＰＩＤ

1Introduction

Hotstoveusingsimplebittypeconstanttemperaturecontrolmethod,temperaturecontrolprecisionisnothigh,thetemperaturecontrolisofunidirectionalrising,largeinertia,largetimedelay,time-varyingcharacteristics,andtheheating,thermalinsulationisdependentontheresistancewireheating,cooling,relyonthenaturalenvironmentforcoolingoraddfurnacematerial,oncetheovershootisdifficulttousecontrolmeanstobringthetemperature.Accordingtomathematicalmodelofcontrolledobjectisdifficulttodeterminepreciselythecharacteristics,thesystemconsistsofPLCasthecorecontroller,accordingtothetemperaturechangeofthePIDcontroller,thecollectionoftemperaturedata,andthenthroughthePLCoutputcontrol,regulatingthyristorconduction,toachieveaccuratecontroloftemperature.Inthispaper,thecontrolobjectiscommonlyusedinthemetallurgicalindustryinHX1typeelectricheatingfurnace,furnacetemperaturefor20-600°

2Systemstructure

.ThehardwaredeviceismainlycomposedofPC,programmablecontroller,temperaturesensor,temperaturetransmitter,solidstaterelaysandelectricheatingfurnace.Asshowninfigure1.

Fig1theblockdiagramofthecontrolsystemofheatingfurnace

Thecontrolsystemofcontrolinformationanddatainformationinthecomputercentralizedmanagement,allocation,makethesystemmoresimple,effective,theusercanbrowse,printingvariousfielddata,statements,andalsotocontrolthespotoperationcontrol.Thetemperaturecontrolsystemofsingleloopcontrolsystem,bytheMitsubishiCoFx2NseriesPLCasthecorecomponent,temperaturedetectionusingplatinumthermalresistanceKrlOO,usedforreal-timedetectionoftemperatureoutput,theRTDmoduleisplacedafterthebigintoanaloginputmoduleFx2N4AD,convertedintodigitalquantity,theuserprocedure,callthePLCinternalPIDthecontrolalgorithm,aPIDoperationalvalues,thevaluesareconvertedintotimevalue,toatime-varyingPWMwavetocontrolzerovoltagetriggersolidstaterelaySSR,toregulatetheelectricheatingwireworkingcurrent,torealizetheheatingfurnacetemperaturecontrolsystem.ThesoftwarepartWindowsXPastheoperatingsystem,theindustrialcontrolconfigurationsoftwareMCGSastheapplicationserverplatform.BetweencomputerandPLCthroughtheMPIportconnection,therealizationofPCandPLCcommunication.Bythecomputertocompletethetemperaturesetting,temperatureandvariouscontrolparametersreal-timemonitoring.

3PIDcontrolalgorithmtoachievethePLC

UsingprogrammablecontrollerforanalogPIDcontrol,youcanusethePIDprocesscontrolmodule,andthismoduleisexpensive,economyispoor.ThesystemusesthePIDfunctioninstruction,whenP1Dfunctioninstructionwiththeanalogquantitywhenusedtogether,notonlycanbesimilartothePIDprocesscontrolmodule,andtheeconomyisgood.Duetotheheatingfurnaceislargedelay,largeinertialinkcontrolobject,thesystemadoptstheintegralseparationPIDalgorithmandBangpositionBangcontrolmethods,namelyatthebeginningoftheprocess,theCambodianguitarorsubstantiallyincreasethesetvalue,byusingtheBangBangcontrol,preventexcessivedeviation,integralaccumulation,thesystemcausedbylargerovershootevenoscillation,sothatthesystemstabilitydecline.Andtotheprocessofthelate,whenthedeviationtothespecifiedrange,increasetheintegralaction,inordertoimprovethecontrolprecision.Intheactualprocessofdebugging,afterseveralrevisionsofcontrolparameters,canachievegoodcontrolparameters,toachievetherequiredprecision.

PLCmainprogramflowdiagramasshowninfigure2,

Fig2

ThePIDalgorithmprogramflowdiagramasshowninFigure3

Fig3

4PIDalgorithmforconvertingthePWMwaveoutput

Theadjustmentofthetemperaturecontrolisthecontrolofthebidirectionalthyristorturn-ontime,therebychangingtheheatingwireheatingpowertorealizethetemperaturecontrol.Firstofall,thePIDoperationresultisconvertedintoaninternaltimertimingvalue,todeterminethedelaytime.Thissystemadoptsthepowerregulatingcircuit,controlapowercycleintheactualconductiontime,theoutputMVisconvertedtoatimevaluemode.Duetotheuseofaninternaltimertimebasefor10ms,T200,andbecausethepowercycleselectedforTz,sotheactualheating