Siemens LMV52.240B1 - Page 211

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page3 Section7
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CANbusFaultsIncluding“AZLnotonBus”and“SystemTest”(continued)
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ThemostcommonCANbuserrorsare:

 “AZLnotonBus”
 Stuckin“SystemTest”
 Errorcode99
 ErrorcodeA7,diagnostic17
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However,therearemanyadditionalerrorcodesthatcanalsobecausedbyanissuewiththe
CANbusnetwork.ThefollowingprocedurecanbeusedtodiagnoseanyCANbusrelatederror:
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1. Takethecoveroffofthelastactuator(orPLL52O
2
module)ontheCANbusnetworkwired
toterminalX51ontheLMV5.Thisshouldhaveonlyone5‐pingreenconnectorpluggedinto
it.TheotherCANbusterminalsshouldbeempty,andisaperfectplacetomeasurevoltage.
EnsurethatthefollowingvoltagesarepresentonthepinsoftheemptyCANbusterminal:

 12VACbetweenpins12VAC1andGND
 12VACbetweenpins12VAC2andGND
 24VACbetweenpins12VAC1and12VAC2
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Whenmeasuringtoground(GND),itisoktohaveanywherefrom10.2‐13.2VACaslongas
bothmeasurementsarethesame.Forexample,itisokaytohave11VACbetweenpins
12VAC1andGNDaslongasthereisalso11VACbetweenpins12VAC2andGND.In
addition,thevoltagebetweenpins12VAC1and12VAC2mustbeexactlydoubletheother
twomeasurements.Ifthesethreevoltagemeasurementsarecorrect,skiptostep3.
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2. Ifoneormoreofthevoltagemeasurementsisincorrect,checkthefollowing:
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 CANbusfusesFU2andFU3arelocatedontherighthandsideoftheLMV5.Check
thatthesefusesarenotblown.Ifeitheroneisblown,checktheLMV5wiringfor
incorrectterminations.Onceanywiringerrorshavebeenfixed,replacetheblown
fuse.
 Themostcommonwiringerrorhastodowithpins3and4ontransformerterminal
SEK2.Pin3onterminalSEK2shouldbewiredtoterminalX52,pin4ontheLMV5.
Pin4onterminalSEK2shouldbewiredtoterminalX52,pin3ontheLMV5.
 Makesurepin3onterminalSEK2ofthe transformerisgroundedproperly.
 MakesuretherestoftheCANbusnetworkiswiredproperly.SeeSection2for
additionalwiringassistance.
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