空调器控制器电路故障检修思路Troubleshooting method for controller circuit of air conditioner.docx
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空调器控制器电路故障检修思路Troubleshooting method for controller circuit of air conditioner.docx
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空调器控制器电路故障检修思路Troubleshootingmethodforcontrollercircuitofairconditioner
空调器控制器电路故障检修思路(Troubleshootingmethodforcontrollercircuitofairconditioner)
Firstpower,afterload,firststrongcurrent,weakcurrent,
Firstindoors,thenoutdoors,firstatbothends,theninthecenter,
Ifthecircuitcanbeseparatedfromtheoutdoorcircuit,themaincircuitandthecontrolcircuit,itwillmakethecircuittroubleshootingsimpleandconcrete.
Howtojudgeindoorandoutdoorcircuitfault:
1,theairconditionerhasinputandoutputsignalline,canbeusedtojudgetheshortcircuitmethod.Suchasthemethodofairconditionercanreturntonormal,thefaultintheoutdoormachine;ifnoteliminatethefault,thefaultintheindoormachine.
2,theoutdoorterminalwiringmeasurementhasnoACvoltageorDCvoltagetodeterminethefaultposition.IftheACorDCvoltagemeasurementoutsidetheterminal,thefaultintheoutdoormachine;suchasmeasurementofACorDCvoltageandthefaultintheindoorcircuit.
3,thelargerpowerofthecabinetairconditionercanobservetheoutdoorcontactorwhethertopullintodeterminethefaultlocation,suchascontactorpullin,indicatingthatthefaultintheoutdoormachine;ifthereisnopull,thatthefaultintheindoormachine
4.Forfaultydisplayairconditioners,faultlocationcanbeidentifiedbyobservingindoorandoutdoorfailurecodes
5,fortheuseofserialcommunicationcircuitoftheairconditioner,oscilloscopecanbeusedtomeasurethewaveformofthesignallinetodeterminethelocationofthefault
6,fortheheatpumptypeairconditionerisnotdefrostordefrostfrequently,mostlyforoutdoormaincontrolcircuitboardfault
7,conditionscanalsobereplacedbychangingthecircuitboardtodistinguishtheoutdoormachinefault
Howtojudgethefaultofcontrolandmaincircuit:
1,forthecompressorfrequentswitchfault,judgefaultlocationbymeasuringtheairconditioningloadcurrentandvoltage.Suchascompressorcompressorcurrentistoolarge,thefaultinthemaincircuit;ifthecompressorcurrentisnormal,thefaultinthecontrolcircuit
2,forthefaultoffancompressordoesnotstartbyobservingtheoutdoorACcontactorisattractedtodeterminethefaultlocation.Suchasthecontactorandthecompressordoesnotwork,thefaultinthemaincircuit;ifthecontactordoesnotpullthefaultinthecontrolcircuit.Fortheinverterairconditioner,thepressdoesnotstart,andthepowermodulecanbeusedtoeliminatethetrouble
1.Measurewhethertheindoorandoutdoorprotectivecomponentsarenormal,todeterminethefaultarea,suchasmeasuringthenormalprotectioncomponents,indicatingthefaultinthecontrolcircuit,suchasmeasuringthedamageofprotectiveelements,indicatingthefailureinthemaincircuit
2,forthefaultofthecompressordoesnotrun,canbepressedforciblycontactor,observewhetherthenormalrefrigerationcompressor.Thecompressorcanpressthecontactorrunningandcooling,thefaultinthecontrolcircuit;suchascompressorover-currentorpressthecontactordoesnotstart,thefaultinthemaincircuit.(invertercompressorcannotusethismethod)
3,forcompressorfrequentlystartfault,suchastouchthecompressorshelltemperatureistoohigh,mostlyforthecircuitorcompressoritselffailure
4,forvariablefrequencyairconditioning,youcanthroughtheairconditionerfaultindicatortojudge,suchasEEPROM,powermodule,communicationfailure
Howtojudgethefaultofprotectionandmaincontrolcircuit:
1.Thelocationofthefaultcanbedeterminedbydetectingtheindoorandoutdoorthermalresistance,pressurerelay,thermalprotectorandphasesequenceprotector.Iftheprotectionelementisnormal,thefaultisshowninthemaincircuit;ifnotnormal,thefaultisshownintheprotectivecircuit.
2,theuseofreplacementmethodtodistinguishfaultpoints,suchasthenewmasterboardreplacedtheoldmotherboard,thefailuretoeliminatethephenomenon,indicatingthatthefaultinthemaincontrolcircuit;suchasreplacement,thefaultstillexists,indicatingthatthefaultintheprotectioncircuit.
3,theuseofairconditioner"emergencyswitch"or"forcedswitch"todistinguishfaultpoints,suchastheemergencyswitchaftertheairconditionercapableofcoolingorheating,themaincontrolcircuitthatnormalfaultintheremotecontroltransmitterandprotectioncircuit;suchasthemandatoryswitch,airconditioningisnotrunning,thefaultinthemaincontrolcircuit
4,observetheairconditionerprotectionindicatorlightisbrightornottodistinguishfaultpoints,suchasprotectionlightisbright,indicatingfaultintheprotectioncircuit,suchasprotectionlampisnotbright,indicatingfaultinthemaincontrolcircuit
5,fornopowersupplydoesnotshowfault,firstcheckthepowertransformer,varistor,safetytubeisnormal,suchastheabovecomponentsarenormal,indicatingthatthefaultinthemaincontrolcircuitboard
6,measuringthemainboardDC12Vand5Vvoltageisnormal,andtheairconditionerhasnopowersupplydisplay,alsodoesnotreceiveremotecontrolsignal,mostlycontrolcircuitfault.Exceptfortheremotecontrolandremotecontrolreceiver.
Howtoanalyzeandjudgethefaultofmaincontrolcircuit:
Themaincontrolcircuitboardfaultofairconditioneroftenhasthefollowingformsofexpression,andcanbeanalyzedaccordingtothefaultphenomenonintheoverhaul.
TheprincipleandmaintenanceofthemaincircuitboardrefertothesixthchapterofHisenseinverterairconditionerprincipleandmaintenance.
1,nopowersupplydisplay,thewholemachinedoesnotwork.Thisfaultreferstothepowertransformer,safetytube,varistorandpowersupplyvoltagenormal,theairconditionerdoesnotreceiveremotecontrolsignal,nopowersourcedisplay,andthewholemachinedoesnotwork.Thereareseveralsituations:
Maincontrolcircuitboard,DCregulatedpowersupply,fault.
Faultofresetcircuitofmaincontrolcircuitboard.
Maincontrolcircuitboard,threeminutesdelaycircuitfault.
Themaincontrolcircuitboardpassesthroughthezerodetectioncircuitfault.
Maincontrolcircuitboard,crystaloscillatorcircuitfault.
Theremotecontrolswitchcircuitfault.
TheindoororoutdoorMCUownfault.
2,thepowersupplyshowsnormal,butthewholemachinedoesnotwork.Thisfaultreferstotheairconditionerpowersupplyshowsnormalandcanreceiveremotecontrolsignal,butthefanmotorandcompressorcannotworkproperly,thecauseofthisfaultisasfollows:
Drivingcircuitfaultofmaincontrolboardofairconditioner.
Powersupplyover-voltagefaultprotectioncircuitfault.
Three-phasepowersupplyphasesequenceprotectioncircuitfault.
Resetcircuitfaultofmaincontrolcircuitboard.
Thepowermoduleisnotnormal.
DC12Visnotnormal.
Communicationcircuitfaultofindoorandoutdoorcontrolboard.
Indoororoutdoorsinglechipmicrocomputermalfunction.
3,thepowersupplyisnormal,butthecompressorisopenandstoppedfrequently.Thisfaultreferstotheindoordoesnotreachthesettemperature,compressoroperationforaperiodoftimeautomaticallystop,andautomaticallystartthephenomenon
Thereasonsforthefailureareasfollows:
Indoormainboardtemperaturedetectioncircuitfault
Failureofdrivecircuitforindoororoutdoorcompressor
Thetemperaturedetectingcircuitoftheoutdoormainboardisoutoforder
Indoorandoutdoorsinglechipmicrocomputermalfunction
4.Thecompressorwillstopautomaticallyafterrunningforsometime.Thisfailuremeansthatthecompressorcanstopafterrunningforsometime.Ifitdoesnotstart,thereisafault,thatis,theroomhasnotreachedthesettemperature.
Drivingcircuitfaultofindoororoutdoormainboard.
Indoororoutdoormaincontrolpanelovercurrentdetectioncircuitfault.
Indoororoutdoormainboard,highandlowvoltageprotectioncircuitfault.
Indoororoutdoormainboardtemperaturedetectioncircuitfault
Indoororoutdoorsinglechipmicrocomputermalfunction
IndoororoutdoorEEPROMselffault
5,compressorrunning,buttheindoorfandoesnotturn.Thisfaultreferstothenormaloperationoftheoutdoorunit,buttheindoorfandoesnotturn,orthefirstboot,thefanrunning,butafteraperiodoftimeautomaticallystop
Indoororoutdoormainboardtemperaturedetectioncircuitfault.
Indoororoutdoormainboardfandrivecircuitfault.
Indoororoutdoormainboardcommunicationcircuitfault.
Indoororoutdoormainboardwindspeeddetectingcircuitfault
Indoororoutdoorsinglechipmicrocomputermalfunction
6、theheatisnormal,butnotdefrostordefrostfrequently.Thisfaultreferstothenormalheatingoftheairconditioner,buttheoutdoorradiatordefrosteffectisnotgoodornotdefrost,andtheoutdoorradiatorofairconditionerdoesnothavefrost,butthereisperiodicdefrostingphenomenon:
Outdoordefrosting,circuitboard,circuitfault.
Outdoormainboardtemperaturedetectioncircuitfault.
Indoorpipetemperaturedetection,detection,protectioncircuitfault.
Communicationcircuitfaultofindoorandoutdoormainboard.
Outdoortubetemperaturethermistoropencircuitfault.
Outdoorfanmotordrivecircuitfault.
7,theairconditionercanrefrigeration,butnotthermalfailure.Thisfaultreferstothenormaloperationofrefrigeration,butwhentheheatingmachinedoesnotworkoutsideoroutsidethevalve,thecoilisnotconnected,electricalfailure,themainreasonforthisfailureisasfollows:
Indoormainboardtemperaturedetectioncircuitfault.
Indoororoutdoormainboardcommunicationcircuitfault.
Outdoormainboard,reversingvalve,coildrivecircuit
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