TechnicalInstructions LMVSeries
DocumentNo.LV5‐1000
Section4 Page4 SCCInc.
7. Amethodofdeterminingfiringrate(fuelflowwithin+/‐5%)shouldbeused.This,in
combinationwithknowledgeofhighfireand turndown,isusedtosettheloadnumbersoneach
curvepoint.AnExcelspreadsheetisavailableforthispurpose.
8. Forsteamboilers,thefeedwatersupp lymustbeadequatetosupporthighfireoperation
.
Feedwatercontrolsmustbeworkingproperly.
9. Theloadontheboilermustbeadequatesothataburner/boilercombinationcanberunat
highfireforaminimumof5minutes.
Pre‐RequisitesforLMV52SystemswithaVFD
1. Allpre‐requisitesoftheBasicLMV51systemapply.
2. Blowermotorspeedsensorandspeedwheelmustbeinstalledcorrectly. SeeAppendixB(LMV5
AccessoriesGuide)formoredetails.
3. Vector‐typeVFDsarehighlyrecommendedduetotheirinherentlymoreprecisemotorspeed
control.Volt/HzVF
Dsarenotrecommendedduetolessprecises
peedcontrol.
4. PropergroundingbetweentheLMV5,theVFD,andthemotormustbeinstalled.SeeSection2
(Wiring)formoredetails.
5. VFDparametersmustbesetcorrectlytobecompatiblewithboththeLMV52andtheblower
motor.SeeSection5(VSD)formoredetails.Particularattentionshoul
dbepaidtothe
following:
a. Analogsignalconfiguration.BoththeLMV52andVFDmustbeconfiguredfora4‐20mA
signal.
b. RampratesbetweentheLMV52andtheVFDmustbecompatible.Ingeneral,ramp
ratesoftheVF
Dshouldbe10secondslessthantheLMV52.
c. VFDmustbesetupasaslaveunitfora4‐20mAsignal.Damping,deadba
nd,andPID
functionsmustbedisabled.
d. Thefrequency(Hz)output ofthedrivemustbedirectlyproportionaltotheanaloginput
signal.
e. Acceleration/decelerationcurvesmustbelinearinsteadof“S‐
shaped”.
f. Rampsettingsmustberampup/rampdowninsteadoframpup/coastdown.
g. AnytypeofdampingorstallpreventionintheVFDshouldbedeactivated.
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