Siemens LMV51.140C1 - Page 183

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page11 Section6

11. TheAZL52willthenprompt"whenvaluestable,continuewithENTER”.AftertheburnerisatPoint
2,waitatleastanadditional30secondstomakesurethattheO
2
valuebeingreadisrepresentative
ofPoint2,thenpressEnter.PressingEnterstorestheO
2
RatioControlCurvepoint.Thevaluethat
isstoredshouldbeclose(+/‐0.2%)tothe"saved"valuethatwasrecordedforPoint2duringRatio
ControlCurvecommissioning.

NOTE:Itisimportanttowaitlongenoughtogetasteady‐stateO
2
valuebeforeEnterispressed.
Ifindoubt,waitlongerforthevaluetostabilize.Waitinglongerthannecessaryhasnoilleffects
fortheO
2
trimcommissioning.

NOTE:IftheO
2
valuedisplayedontheAZL52isnotsteady(oscillatingmorethan+/‐0.1%O
2
),itis
likelythattheO
2
sensorisnotmountedcorrectly,orthereareotherissueswiththeburner/
boilerthatareaffectingthefuel/airratio.Theseissuesmustbecorrectedbeforeproceeding.

12. Next,slowlyincreasetheStandardValnumber,whichreducestheairflowintotheburner.The
readingbesideO2ControlshouldstarttodropasStandardValisincreased.NotethattheTa
utime
oftheboilercomesintoplayhere,soitmaytake10‐15secondsormoreforachangeinthe
StandardValnumbertobeseenintheO
2
reading.

13. OncetheStandardValnumberhasbeenincreasedenoughtogetthe%O
2
intothetargetband(at
least0.5%O
2
abovetheO
2
Alarmand1%belowtheO
2
RatioControlCurvepoint),thepointcanbe
stored.ThisisdonebypressingEnter,Escape,andthenEnteragain.

14. Afterthepointisstored,thedelaytimeatPoint2(TauLow‐Fire)willbemeasured.Thisshould
occurandtheAZL52shouldstate"MeasurementSuccessful,ControlParametersStored".

15. TherestofthePoints(3thru10)cannowbedoneinasimilarmanner.Thedelaytime
(TauHigh‐
Fire)willalsobemeasuredatthehighfirepoint,inthiscasePoint10.

16. AfterthedelaytimeissuccessfullymeasuredatPoint10,escapeoutoftheO
2
ControlCurve.See
Figures6‐4and6‐5belowforanexampleofwhattypicalO
2
trimcurvesandLambdaFactorcurves
mightlooklikeforthisapplication.

17. TheO
2
trimcannowbeactivatedinoneoftwomodes.Mode“conAutoDeac”allowstheO
2
trimto
workaslongasthemeasured%O
2
doesnotexceedtherichlimit(O
2
Alarm)ortheleanlimit(O
2

MaxValue).Ifeitheroftheselimitsisexceeded,theO
2
trimwilldeactivateandtheburnerwillrun
onthenormalRatioControlCurves.Mode“O2Control”alsoallowstheO
2
trimtowork,exceptthat
ifthelimitsareexceededalockoutwilloccur.Mode“conAutoDeac”istypicallyused.TosettheO
2

controloperatingmode,usethefollowingmenupath:

Params&Display>O2Contr/Alarm>GasSettings>OptgMode

18. TheO
2
trimisnowcommissionedandactivated.Someadditionaltuningmayberequired
dependingontheapplication.See"PostCommissioningTuning"laterinthissectionformore
information.


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