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外文翻译--系统的设计功能.doc

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外文翻译--系统的设计功能.doc

SYSTEMSTRUCTUREANDCONTROLSCHEMESYSTEMDESIGNFEATURESTHECONTROLSYSTEMOFVENTILATIONUNITSWITHCENTRIFUGALACTIVATIONOFINTERLOCKINGANDOVERTEMPERATUREPROTECTIONANDCONVENTIONALRELAYSCOMPAREDTOTHEIMPLEMENTATIONOFTHEVENTILATIONSYSTEM,PLCSYSTEMHASALOWFAILURERATE,HIGHRELIABILITYANDWIRINGISSIMPLE,EASYMAINTENANCEANDMANYOTHERADVANTAGES,PLCCONTROLFUNCTIONSSOTHATTHVENTILATIONSYSTEMSGREATLYENHANCETHEDEGREEOFAUTOMATION,REDUCINGTHELABORJOBSINTENSITYPLCANDFREQUENCYCONVERTERWITHTHEUSEOFAIRPRESSURETRANSMITTER,ALLOWINGTHESYSTEMTOCONTROLTHESECURITY,RELIABILITY,GREATLYIMPROVED,BUTALSORUNTHEFANSIGNIFICANTLYREDUCETHEFAILURERATE,NOTONLYSAVESENERGYBUTALSOIMPROVETHEOPERATIONRATEOFEQUIPMENTMINEVENTILATIONSYSTEMTOMEETTHEREQUIREMENTSOFAUTOMATICCONTROLSYSTEMTHESPECIFICDESIGNREQUIREMENTSAREASFOLLOWS1THISSYSTEMPROVIDESMANUAL/AUTOMATICMODEOFTHETWO,WITHASTATEOFALARMDISPLAYANDFEATURESSUCHASFAULTS2ANALOGPIDOPERATORVIAPRESSUREINPUT,OUTPUTANALOGCONVERTERCONTROL3INTHEAUTOMATICMODE,WHENTHEDOWNHOLEPRESSUREBELOWTHESETPRESSURELIMIT,TWOSETSOFFANSWILLBERUNNINGTOWORKATTHESAMETIME,ATTHESAMETIMEANDISSUEDINSTRUCTIONSANDALARMSIGNALS4ANALOGINPUTGAS,WHENTHEGASCONCENTRATIONISGREATERTHANTHEUPPERLIMITOFALARMSETTINGS,ANDREPORTTOTHEPOLICETOGIVEDIRECTIONSWHENTHEGASCONCENTRATIONISGREATERTHANTHEUPPERLIMITOFPOWERSETTINGS,PLCWILLCUTOFFTHEFACEANDWINDPOWERGENERATINGUNITSTOPREVENTTHEGASEXPLOSION5THEUSEOFTEMPERATURESENSORSMEASUREDTEMPERATUREORTHEWINDBEARINGUNITSTATORTEMPERATURE,BEARINGTEMPERATUREORWHENTHESTATORTEMPERATUREEXCEEDSTHESETALARMONTHELINE,GIVEDIRECTIONSANDWARNINGSIGNALSWHENTHESTATORTEMPERATUREORTHEWINDBEARINGTEMPERATUREEXCEEDSTHESETTEMPERATUREOFTHELINEUNITCONVERSION,PLCWILLCUTOFFTHEINSTRUCTIONSANDALARMSIGNALANDAUTOMATICALLYCUTOFFTHEAIRUNITISCURRENTLYRUNNINGINAUTOMATICMODEANDCANAUTOMATICALLYACCESSANOTHERRUNTYPHOONUNIT,IFINTHEHANDDYNAMICMANNER,STAFFMANUALLYSWITCH16INORDERTOPREVENTFATIGUECENTRIFUGALFANOPERATIONINANYSTATE,SETTHEFANTORUNINATOTALTIMEWILLAUTOMATICALLYSWITCHTOANOTHERUNITOPERATIONTYPHOONSYSTEMARCHITECTUREANDPROGRAMVENTILATIONCONTROLSYSTEMISMAINLYCOMPOSEDOF2SETSOFCENTRIFUGALFANS,CENTRIFUGALFANSEACHHAVETWOMOTORS,EACHMOTORDRIVESASETOFFANFILMS,TWOFILMSONTHEROTATINGFANANDASETOFWINDSUCTION,AGROUPTOINCREASEWINDSPEED,FORTHEWINDTOCARRYOUTUNDERGROUNDUNDERGROUNDAIRVOLUMEINACCORDANCEWITHTHEDIFFERENT,USINGDIFFERENTTYPESOFFANSTHEDESIGNOF245KWFANASANEXAMPLE,THESELECTIONOFAS72200PLC,THEAIRPRESSURESENSORANDTRANSDUCER,SUCHASTHEFORMATIONOFACOMPLETECLOSEDLOOPCONTROLSYSTEMINCLUDINGCONTACTORS,INTERMEDIATERELAYS,THERMALRELAYS,MINEEXPLOSIONPROOFMAGNETICSTARTER,CIRCUITBREAKERPROTECTIONOFELECTRICALSYSTEMS,ELECTRICALANDPLCTOACHIEVEEFFECTIVEPROTECTION,ASWELLASMOTORCONTROLSWITCHPLCCONTROLSYSTEMWITHTHEFANMOTORTOSTARTANDRUN,MONITOR,INTERLOCKANDOVERTEMPERATUREPROTECTIONPLCANDWITHTHEUSEOFAIRPRESSURETRANSMITTER,ALLOWINGTHESYSTEMTOCONTROLTHESECURITY,RELIABILITY,GREATLYIMPROVED,BUTALSORUNTHEFANSIGNIFICANTLYREDUCETHEFAILURERATEANDIMPROVETHEOPERATIONRATEOFEQUIPMENT2FORCOALMINEVENTILATIONSYSTEMTOMEETTHEREQUIREMENTSOFAUTOMATICCONTROL,DESIGNOFCONTROLPROGRAMSISASFOLLOWSTHESYSTEMPROVIDESMANUAL/AUTOMATICMODEOFTHETWO,WITHSCENECONTROL,STATUSDISPLAYANDALARMFAILUREINMANUALMODE,THEFANCONTROLTHROUGHTHESWITCHFROMTHEEFFECTSOFAIRPRESSUREINSIDETHEMINEINORDERTOPREVENTFATIGUEFANRUNNING,INANYSTATEINTHECUMULATIVEFANRUNTIMESETTOSWITCHTOANOTHERMACHINERUNNINGTHETYPHOONAGROUPBGROUPCENTRIFUGALFANCENTRIFUGALFANWITHTWOSWITCHESCANBECONVERTEDTIMECYCLESANDTIMINGCANBERANDOMLYSETARESOUNDANDLIGHTALARMSIGNALFORMVOICEALARMELECTRICFLUTEBUTTONCANBEUSEDTOLIFT,ALARMTROUBLESHOOTINGINSTRUCTIONSAUTOMATICALLYDISAPPEARINAUTOMATICMODE,THEUSEOFAIRPRESSUREFAREASTONEMINEDETECTIONSENSORSWITHINTHEPRESSURESIGNAL,THESIGNALTRANSMITTERWILLTRANSFORMTHESITEINTOAUNIFIEDSTANDARDSIGNALEG,420MADCCURRENTSIGNAL,05VDCVOLTAGESIGNAL,ETC,INTOTHEA/DCONVERTERANALOGDIGITALCONVERSIONMODULE,ANDTHENINTOTHEPLC,PLCTODETECTTHEPRESSUREVALUEWITHSETVALUESOFPRESSUREANDDEALWITHTHEWORKOFTHEOUTPUTSIGNALTOCONTROLFANWHENTHEAIRPRESSUREINSIDETHEMINEINANATMOSPHERICPRESSUREORINTHESETTINGOFAVALUEABOVEATMOSPHERICPRESSURE,THEWORKOFCENTRIFUGALFANCENTRIFUGALFANWITHBACKUPCYCLEOFTHEWORK;WHENASUDDENACCIDENT,THEMINESAIRPRESSUREISLOWERTHANASETOFATMOSPHERICPRESSUREVALUE,THEWORKOFCENTRIFUGALFANCENTRIFUGALFANWITHBACKUPCYCLEISNOLONGERWORK,ANDAUTOMATICALLYSWITCHTOTHEWORKATTHESAMETIME,INCREASETHEVOLUMEOFTHEMINEVENTILATION,MINEUNTILTHEPRESSUREROSETOVALUESSETABOVEATMOSPHERICPRESSURE,THEWORKOFVENTILATIONCENTRIFUGALFANWITHBACKUPMACHINETORESUMETHECYCLEOFWORK3GASINTHEMINEFORWINDSYSTEMS,COALMINEGASCONCENTRATIONINTHEGASCONCENTRATIONDETECTIONSENSORWITHATRANSMITTERSIGNALWILLBETHESITETRANSFORMINTOAUNIFIEDSTANDARDSIGNAL,INTOTHEA/DCONVERTERANALOGDIGITALCONVERSIONMODULE,ANDTHENINTOTHEPLC,THESAMEWILLBEDETECTEDBYTHEPLCANDSETNUMERICALVALUESFORCOMPARISON,WHENTHEGASCONCENTRATIONGREATERTHANTHEVALUEAFTERTHESET,PLCOUTPUTSIGNALSTOCONTROLFANTOSTOPWORKING,ANDTHEOUTPUTSIGNALPOWERWASAUTOMATICALLYCUTMINETOMEETTHEREQUIREMENTSOFWINDPOWERINTERLOCKTOAVOIDELECTRONICSPARKSLITTHEGASTOPREVENTGASEXPLOSIONACCIDENT系统的设计功能本控制系统具有离心通风机组的启动、互锁和过热保护等功能。与常规继电器实施的通风系统相比,PLC系统具有故障率低、可靠性高、接线简单、维护方便等诸多优点,PLC的控制功能使通风系统的自动化程度大大提高,减轻了岗位人员的劳动强度。PLC和变频器与空气压力变送器配合使用,使系统控制的安全性、可靠性大大提高,也使通风机运行的故障率大大降低,不仅节约了电能,而且还提高了设备的运转率。为满足矿井通风系统自动控制的要求,系统的具体设计要求如下(1)本系统提供手动/自动两种工作模式,具有状态显示以及故障报警等功能。(2)模拟量压力输入经PID运算,输出模拟量控制变频器。(3)在自动方式下,当井下压力低于设定压力下限时,两组风机将同时投入工作运行,同时并发出指示和报警信号。(4)模拟量瓦斯输入,当矿井瓦斯浓度大于设定报警上限时,发出指示和报警。当瓦斯浓度大于设定断电上限时,PLC将切断工作面和风机组电源,防止瓦斯爆炸。(5)运用温度传感器测定风机组定子温度或轴承温度,当定子温度或轴承温度超过设定报警上线时,发出指示和报警信号。当定子温度或轴承温度超过设定风机组转换温度界线时,PLC将切断指示和报警信号并自动切断当前运行风机组,在自动方式下并能自动接入另一台风机组运行,若在手动方式下,工作人员手动切换1。(6)为防止离心风机的疲劳运行,在任何状态下,风机在累计运行设定时间后都会自动切换至另一台风机组运行。结构和方案通风控制系统主要由2台离心风机组成,每台离心风机有两台电机,每台电机驱动一组扇片,两组扇片是对旋的,一组用于吸风,一组为增加风速,对井下进行供风。根据井下用风量的不同,采用不同型号的风机。本设计以风机245KW为例,选用一台S72200PLC、空气压力传感器和变频器等组成一个完整的闭环控制系统。其中还包括接触器、中间继电器、热继电器、矿用防爆型磁力启动器、断路器等系统保护电器,实现对电机和PLC的有效保护,以及对电机的切换控制。本PLC控制系统具有对通风机的电动机启动与运行,进行监控、联锁和过

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