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What is the static test and dynamic test of the inverter detection method?

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[Abstract]:
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-phaseoutputvoltagevalues​​ofU,V,andW.Ifthereisalackofphaseorthree-phaseimbalance,themoduleordriverboardisfaulty.Whentheoutputvoltageisnormal(nolackofphase,three-phasebalance),loadtestisperformed.Whentesting,itisbesttotestatfullload.
First, static test
 
Set the multimeter to the resistance X10 level, connect the multimeter's red meter stick to the P terminal of the DC power supply inside the inverter, and then connect the black meter stick to R, S, T respectively. The resistance value should be about tens of ohms. When the black watch rod is connected to the end and the red watch rod is connected to R, S, T in order, there will be a resistance value close to infinity. Connect the multimeter's red meter stick to the N terminal of the DC power supply inside the inverter and repeat the above steps. If the result is the same as above, it means that the static test is normal. If the three-phase