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1、用直流电压挡测量变频器的输出交流电压（MeasuringtheoutputACvoltageofinverterwithDCvoltageguard）CantheoutputvoltageoftheinverterbemeasuredwiththeDCvoltagebarrier?Thesnowinthewildernessispublishedin2010/6/613:12:12Tag(TAG):frequencyconversionmaintenancefaultmeasurementmethodCantheoutputvoltageoftheinverterbemeas
2、uredwiththeDCvoltagebarrier?ThereisamasterwiththedisciplesheardthatsomeDCvoltmeterblock,theACoutputvoltagetomeasurethefrequencyconverter,andthusdeterminetheinvertermoduleisgoodorbad,evencandecidewhichone(ARM)invertermoduleisgoodorbad,evencandeterminetheperformanceoftheinvertermoduledeterior
3、ationphenomenonthanACamoreintuitiveandeffectivemeasure.IsitpossibletomeasureACvoltagewithdcgear?Willitburnoutthemultimeter?Thedisciplefeltthathehadnoheart,soheaskedhismasterifhecouldmeasuretheoutputvoltageoftheconverterwithDCvoltageThemastersaid,"whatdoyouthink?"Theteacherponderedforawhile,
4、andaskedthedisciple:ifyoucanusetheDCgeartotestACvoltage,thenwhythemultimeteralsoneedtodistinguishtheDCgearandACGear?Master,it'saquestionandanswer.Theapprenticethought,also,themastersaidisreasonable,hecannotrefute.Butcouldnotunderstandthesubtleheartordepressed,tofindtheirownprofessionalbroth
5、erstodiscuss,wehavesaid,allsortsofgossip,somesay,isnotaunifiedopinion.Thesecondday,theworkshophasagoodfrequencyconverter,oneofthebrotherstooktheirMF47pointermultimetertoDC500Vgear,so,whenIfirsteatcrabs,ifburnedmytable,everyoneisalsoalessontoknowthepearZitaste,shouldtastegood.Youwillconnectt
6、heinverterpowerline,thebrotherswillmultimeterpenlaptodrivetheUandWoutputterminals.Youstartaconverter,starttheinitialstage,thelowerfrequency,seethemultimeterhandsswingingbackandforth,withtheriseofthestartfrequency,theswingspeedaccelerated,swingbecomessmall,above15Hz,onlyseethepeninthe0Vposit
7、ionextremelysmallrapidsmallswing,frequencytorise,steadyhandsatzero,almostcannotseetheswing.Brotherchangedtheterminal,respectively,U,V,Wthree-phaseoutputvoltagewasmeasuredagain,thisisthecase:iftheinverterisinnormalstate,themeasuredDCvoltageshouldbezero,an
