common problem_common problem_SINOCERA PIEZOTRONICS, INC

First,statictest SetthemultimetertotheresistanceX10level,connectthemultimeter'sredmetersticktothePterminaloftheDCpowersupplyinsidetheinverter,andthenconnecttheblackmetersticktoR,S,Trespectively.Theresistancevalueshouldbeabouttensofohms.WhentheblackwatchrodisconnectedtotheendandtheredwatchrodisconnectedtoR,S,Tinorder,therewillbearesistancevalueclosetoinfinity.Connectthemultimeter'sredmetersticktotheNterminaloftheDCpowersupplyinsidetheinverterandrepeattheabovesteps.Iftheresultisthesameasabove,itmeansthatthestatictestisnormal.Ifthethree-phaseresistanceisunbalanced,itcanindicatethattherectifierbridgeisfaulty.WhentheredwatchrodisconnectedtothePterminal,theresistanceisinfinite,anditcanbeconcludedthattherectifierbridgeisfaultyorthestartingresistanceisfaulty. Two,dynamictest 动态Thedynamictestcanbeperformedafterthestatictest.Beforepower-on,youmustconfirmwhethertheinputvoltageiscorrect.Ifyouconnectthe380Vpowersupplytothe220V-classinverter,therewillbeexplosives(explosivecapacitors,varistor,modules,etc.).Itisnecessarytocheckwhetherthebroadcastingportsoftheinverterarecorrectlyconnected,whethertheconnectionisloose,andtheabnormalconnectionmaysometimescausetheinvertertomalfunction,andinseverecases,anexplosionwilloccur.Detectthefaultdisplaycontentafterpower-on,andpreliminarilydeterminethefaultanditscause.Ifthefaultisnotdisplayed,firstcheckwhethertheparametersareabnormal,andresettheparameters,thenstarttheinverterwithnoload(withoutmotor),andtestthethree-phaseoutputvoltagevaluesofU,V,andW.Ifthereisalackofphaseorthree-phaseimbalance,themoduleordriverboardisfaulty.Whentheoutputvoltageisnormal(nolackofphase,three-phasebalance),loadtestisperformed.Whentesting,itisbesttotestatfullload.

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