外文翻译--恒压供水变频器.DOC

ConstantpressurewatersupplyfrequencychangerThetransistorfrequencychangernotonlyovercamehasformerlyexchangedvelocitymodulationmanyshortcomings,moreoverthevelocitymodulationperformancemightcomparefavorablywiththedirectcurrentmotorvelocitymodulationperformance.Thethree-phaseasynchronousmotorhastheservicetobeconvenient,meritandsoonpricesmalladvantage,powerandrotationalspeedadaptbreadth,itsfrequencyconversionvelocitymodulationtechnologyintheminiaturization,thelowcostandtheredundantreliableaspectholdstheobvioussuperiority.Totheendofthe80s,thealternatingcurrentmachinefrequencyconversionvelocitymodulationtechnologyrapidlydevelopsintoamaturetechnology,itwillsupplythealternatingcurrentmachinethelaborfrequencyalternatingcurrentsupplytoturndirectcurrentafterthedioderectification,againbycomponentandsoonIGBTorGTRmodulecounterwillturnthealternatingcurrentsupplywhichthefrequencymightmove,willdrivetheelectricalmachinerybythispowersourcetomoveunderthespeedchangecondition,andautomaticsuitablestrainloadcondition.Afteritchangedinthetraditionalindustrytheelectricalmachinerytostartonlycanbytheratedpower,decidetherotationalspeedthesolemovementway,thusachievedtheenergyconservationgoal.Themodernfrequencyconversionvelocitymodulationtechnologyappliesintheelectricpowerwaterpumpwatersupplysystem.Becausethefrequencyconversionvelocitymodulationhasthevelocitymodula-tionthephysicalcharacteristicswell,efficiencyhigh,velocitymodulationscope-wide,precisionhigh,adjustingcharactercurvesmooth,maycontinualrealize,thesteadyvelocitymodulation,thevolumesmall,themaintenancesimpleisconven-ient,theautomatedlevelhigheraseriesofprominentmeritsbuttimepeoplesfavor.Whenitappliesespeciallyintheairblower,thewaterpumpandsoonthelargecapacityload,mayobtaintheenergyconservationeffectwhichothervelocitymodulationwaysisunabletocompare.Thefrequencyconversionvelocitymodulationsystemmainequipmentisprovidesthefrequencyconversionpowersourcethefrequencychanger,thefrequencychangermaydivideintoexchange-directcurrent-toexchangethefrequencychangerandtheexchange-exchangesthefrequencychangertwobigkinds,atpresentdomesticmostlyuseshandsover-isstraight-handsoverthefrequencychanger.Hasbeenpublishedsincethegeneralfrequencychanger,thefrequencyconversionvelocitymodulationtechnologyobtainedthewidespreadapplicationineachdomain.Thefrequencyconversionmodulatesvelocitythepermanentwaterlevelfeedwaterequipmentbyitsenergyconservation,security,highqualitymeritandsoonwatersupplyquality,causedourcountrytosupplywatertheprofessiontechnicalequipleveltostartfromthebeginningofthe90stoexperiencealeap.Theconstantpressure,thepermanentwaterlevelwatersupplyvelocitymodula-tionsystemrealizationwaterpumpelectricalmachinerysteplessspeedregulation,restsonwiththewaterlevelchangeregulatorsystemmovementparameter,inthewaterconsumptionchangeregulatorsystemmovementparameter,changeswhenthewaterconsumptionmaintainsthehydraulicpressuretobeconstantandthewaterlevelconstantlybysatisfiesthewaterusedrequest,isnowmostadvanced,thereasonableenergyconservationwatersupplysystem.Obtainedtheverybigdevelopmentinthepracticalapplication.Alongwiththeelectricpowerelectronictechnologyrapiddevelopment,thefrequencychangerfunctionmoreandmoreisalsostrong.Fullyuseseachkindoffunctionwhichinthefrequencychangersets,tothereasonabledesignfrequencyconversionvelocitymodulationconstantpressurefeedwaterequipment,reducesthecost,guaranteedaspectandsoonproductqualityhastheextremelyvitalsignificance.Intheshortseveralyears,thefrequencyconversionvelocitymodulationconstantpressurewatersupplysystemexperiencedthedevelopingprocesswhichconsummatedgradually,theearlytimehaspumpedthevelocitymodulationconstantpressuresystemtopumponlythevelocitymodulationsystemtoreplacegradually.Althoughonlypumpsthevelocitymodulationsystemdesignsimplereliable,butbecauseonlypumpstheelectricalmachinerydepthvelocitymodulationtocreatethewaterpump,theelectricalmachineryoperatingefficiencylowly,butpumpsthevelocitymodulationsysteminvestmentmoretosave,theoperatingefficiencyishigh,bytheactualproofisthemostsuperiorsystemdesign,veryquicklydevelopsintotheleadingproduct.TheSemensfrequencychangerdesignlevelcompareswithvariousbrandsfrequencychanger,thefunctionisformidable,impeccable!Ifagaincanfromthedesignconsiderwillserviceconvenienttothefuture,Thenatureandenhancedthecomponentsinthemanufactureselectionthequalityismostideal.TheSemensfrequencychangerrectificationunitpressureresistanceis1200V.Ifcanusepressureresistance1600Vtherectificationunit,Ithoughtcanenhancethestabilitygreatlyandreducethefailurerate.Guardsagainstthedisturbancethemeasuretowaitforstrengthens,SemensfrequencychangersometimescanbutcontrolbecauseofthedisturbancequestionthehosttheboardorI/TheOportburnt.Theconstantpressurewatersupplyseriesfrequencyconversionvoltmetersisfortheairblower,pumpskind,currentcapacityandthespecial-purposefrequencyconversionvoltmetersthepressurecontrolcharacteristicspeciallyandsoonaircompressorwhichbutdevelops.Thisaircrafttypehasthegeneralfrequencychangerthebasicfunction.Thisproductdesignhadmainlyconsideredtheenergyconservationandtheautomatedrequest,insetsattheautomaticenergyconservation,PID,simplePLCandfunctionandsoonRS485communicationconnection,mayfacilitateandPLC,thecomputerorthemainlinecarriesonthecommunication,theconvenientcustomeroperationandthemonitoring,atthesametimethiscompanyalsospeciallydevelopedonekindtoprocesstheconstantpressurewatersupplyspeciallythecontrolpanel,mightconvenientlybeusedtogetherwiththefarbiographypressuregauge.First,frequencyconversionconstantpressurewatersupplycharacteristic:1st,thefrequencyconversionconstantpressureforthehydro-energyautomatic24hourmaintenancesconstantpressure,andautomaticallystartstherelaypumpaccordingtothepressuresignal,thestepless-adjustmentpressure,thewatersupplyqualityisgood,compareswiththetraditionalwatersupply,cannotcreatethepipenetworktoburstandthewatercockresonanceeffect.2nd,thestartissmooth,reducestheelectricalmachinerywaterpumptheimpact,lengthenedtheelectricalmachineryandthewaterpumpservicelife,hasavoidedinthetraditionalwatersupplyimpingementphenomenon.3rd,usesthefrequencyconversionconstantpressurewatersupplyprotectionfunctioncompletely,themovementisreliable,hasowespresses,haspressed,hasflowed,protectionfunctionandsoontheheat.5th,mayaccordingtotheuserneed,chooseeachkindofattachmentfunction,forexample:Theelectricalmachineryfixedtimetakesturns,functionandsoondormancy.Second,principleofwork:Thefrequencyconversionconstantpressurewatersupplysystemusesapotentiometerhypothesispressure(alsotobepossibletousekneadingboardinteriorhypothesispressure),usesapressuretransmitter(feedbackis4-20mA)examinesinthepipenetworkthepressure,thepressuretransmittersendsinthesignalthefrequencychangerPIDreturnroute,afterPIDreturnrouteprocessing,sendsoutawatervolumetoincreaseorthereducedsignal,controlsthemotorrotationalspeed.Likeincertaindelaytime,pressureinsufficiencyoroversized,thendoesworkthefrequencythroughPLC/Thefrequencyconversioncut,causestheactualpipene