What are the fault checking methods for electrical equipment of CNC machine tools?
Time:
2019-07-10
1.Faultinvestigationbeforemaintenance Whenanindustrialmachinehasanelectricalfault,itshouldnotbeblindlyandmanuallyrepaired.Firstofall,theCNCmachineoperatororthepersonpresentatthetimeofthefaultisaskedaboutthefaultphenomenon.Itisthefirsttimethatitsuddenlyoccurs,oroccursfrequently,thefaultoccurs,whethertheexternalphenomenonhassmoke,flashover,abnormalsound,thesurroundingenvironmentwhenthefaultoccurs,whetherthereisanyGas,whethercorrosivegasiscorroded,whetherthereiswaterleakage,whethertheheatsourcecauseselectricaldamage,etc.;whetherithasbeenrepaired,thecontentsoftherepair,whatoperationsandmalfunctions. BecausetheoperatorofCNCmachinetoolsismostfamiliarwiththeperformanceofthisCNCmachinetool,itisalsothefirsttounderstandthepossiblecausesandpartsofthefault,whichisbeneficialtotheCNCmachinetoolmaintenancepersonneltojudgethescopeofthefaultandanalyzethefaultbasedontherelevantworkingprinciple.Causes. Beforetheinspection,youcanunderstandtheoperationsituationbeforeandafterthefaultandtheabnormalphenomenonafterthefaultoccursbyasking,watching,listeningandtouching,soastojudgethefaultoccurrencelocationaccordingtothefaultphenomenon,andthenaccuratelyeliminatethefault.Q:Asktheoperatorabouttheoperationstatusofthecircuitandequipmentbeforeandafterthefaultandthesymptomsafterthefaultoccurs.Whetherthefaultoccursfrequentlyoroccasionally;whethertherearesignssuchasnoise,smoke,sparks,abnormalvibration,etc.Largeandfrequentstart,stop,brake,etc.;whetherthereismaintenanceorrepairormodificationoftheline.Look:Checkwhetherthereareobvioussignsofappearancebeforethefailure,suchasvarioussignals;theconditionofthefusewiththeindicatingdevice;thetrippingactionoftheprotectivedevice;thedisconnectionofthewire;thesingeingorweldingofthecontact;theoverheatingofthecoil.Listen:Underthepremisethatthelinecanstillrunandnotdamagetheequipment,youcanpoweronthetest,andlistencarefullytothesoundofelectricalappliancessuchasmotorcontactorsandrelays.Touch:Aftercuttingoffthepowersupply,touchthemotor,transformer,solenoidandfuseassoonaspossibletoseeifthereisoverheating. Throughtheaboveinvestigation,wehaveapreliminaryunderstandingofthephenomenonofthefault,whichreflectsvariousfaultproblems,andthefaultphenomenonandthefaulttypeareone-to-onecorrespondence.Aslongaswecangraspthesignsreflectedbythephenomenon,itisnotdifficulttofindFoundthefault. 2.Determineandnarrowthefaultrangebylogicanalysis Accordingtotheunderstandingandunderstandingofthefaultphenomenon,furtherclassifytheelectricalfaultphenomenon,andclarifywhetherthefaultisinthemotorpart,themaincircuitpart,orthecontrolcircuitpartfault,orthefaultofthecontrolelectricalcomponentitself. 3.Findanddeterminethefaultpointaccordingtothefaultrange. Afterdeterminingthepossiblerangeofthefault,itisnecessarytofurtherdeterminethefaultpoint.Tofindthefaultpoint,acorrectandeffectivemethodmustbeapplied. 3.1Visualinspectionofthefaultrange Afterdeterminingthepossiblerangeofthefault,visualinspectionoftheelectricalcomponentsandconnectingwiresintherange,forexample:meltblownofthefuse;looseorloosewirejoint;contactorcontactofthecontactorandrelay,Whenthecoilisburntout,thesurfaceinsulatingpaperisburntanddiscolored,andtheburntinsulatingvarnishflowsout;thespringisdetachedorbroken;theactionmechanismoftheelectricalswitchisblockedandthelike,andthefaultpointcanbeclearlyindicated. 3.2Determinethepointoffailurebymeansofapower-ontestrun Whenthefaultisnotdetectedbythevisualinspection,thefaultmaybeanalyzedaccordingtothefaultphenomenonandthecircuitdiagramisusedtoconfirmthatthefaultwillnotbefurtherexpandedandthepersonalandequipmentaccidentsmayoccur.Inordertomoreaccuratelyunderstandthepossiblecauses,thepowertestcanbeperformed.Check(removetheloadwiringifnecessary)todistinguishwhetherthefaultmaybeintheelectricalpartorinotherpartsofthemachine;onthemotororonthecontroldevice;onthemaincircuitoronthecontrolcircuit,undernormalcircumstancesCheckthecontrolcircuit.Thespecificmethodisasfollows:Whenabuttonorswitchisoperated,therelevantcontactorsandrelaysinthelinewillworkinthespecifiedsequenceofactions.Ifyoumovetoanelectricalcomponentinsequence,itisfoundthattheactiondoesnotmeettherequirements,indicatingthattheelectricalcomponentoritsrelatedcircuithasaproblem.Theninthiscircuittocarryoutitem-by-itemanalysisandinspection,generallycanfindfaults.Afterthefaultofthecontrolcircuitisrestoredtonormal,themaincircuitisturnedon,thecontroleffectonthemaincircuitischecked,andtheoperationofthemaincircuitisobservedforabnormality. 3.3Accordingtothefaultrange,thefaultisdeterminedbydetection Whenthefaultrangebelongstoacertainpart,theinstrument,theinstrumentandthecorrespondingdetectionmethodarefurtherusedtofurthernarrowthefaultfromalargerrangeandfinallydeterminetothefaultpoint.Articlelink:ChinaMachineToolBusinessNetworkhttp://www.jc35.com/news/detail/56742.html