Siemens LMV52.240B1 - ; VSD will Not Operate

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page19 Section7
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VSDWillNotOperate
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IftheVSDwillnotoperatetheblower(blowerwillnotspin)whentheLMV52standardizationis
activated,checkthefollowing:
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1. EnsurethattheVSDisactivatedthroughthefollowingmenupathintheLMV52:
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 Params&Display>RatioControl>Gas/OilSettings>VSD=activated
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2. TheVSDcannotstandardizeifthesafetyloopisopen.Checkthatthesafetyloopisclosed
bymakingsurethereis120VAConterminalX3‐03.1.Ifthereisnot,checkthelimitsinthe
safetyloopandtheburnerflangetoseewhichlimitisopen.
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3. EnsurethattheLMV52isnotinalarm.Ifso,resetthefaultandattempttostandardize
again.
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4. Verifythatthe0/4‐20mAsignalandtherun/stopcontactwiredbetweentheVSDandthe
LMV52arewiredcorrectly.SeeSection2formoreinformationonwiring.
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5. Verifythatthethree‐phasemotorwiringbetweentheVSDandthemotoriscorrect.
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6. VerifythattheVSDissetupproperlyforthemotoritisdriving.Specifically,checkthe
following:
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 TheVSDshouldbespannedsothat0/4mAequals0Hzand20mA=62Hz(ona60Hz
gridfrequency).SeeSection5formoreinformation.
 TheVSDisinremotemodesothatitlooksfora0/4‐20mAsignalandarun/stop
contact.Closingtherun/stopcontactshouldcausetheVSDtooperatethemotor.
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7. Disconnecttheanalogsignalandrun/stopcontactwiresbetweentheVSDandtheLMV52.
Useahandheld0/4‐20mAsourceandatoggleswitchtoverifythattheVSDrespondstoa
contactclosureandavarying0/4‐20mAsignal.
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 IftheVSDdoesnotrespond,correcttheconfigurationoftheVSD.
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 IftheVSDrespondstothecontactclosureandthevarying0/4‐20mAsignal,
thengotothenextstep.
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8. WiththewiresbetweentheLMV52andVSDstilldisconnected,useamulti‐metertoverify
thattheLMV52outputsabout19.5mAduringthestandardization(seenotebelow).Also
verifythattherun/stopcontactintheLMV52closesandremainsclosedduringthe
standardization.
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