Siemens LMV52.240B1 - AZL Says Measurement Not Successful When Measuring the Delay Time for O 2 Trim

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page17 Section7
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AZLSays“MeasurementnotSuccessful”WhenMeasuringtheDelayTimeforO2Trim
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WhensettingthelowfirepointorthehighfirepointontheO
2
controlcurve,theAZLmeasures
whatiscalledthe“delaytime”(Tautime).Thedelaytimeisdefinedasthelengthoftimeit
takesachangeintheairdamperpositiontobedetectedbytheO
2
sensor.Thistimeislongerat
lowfireandshorterathighfireduetogasvelocity.Ifanerroroccurswhiletryingtomeasure
thisdelaytime,theAZLsays“MeasurementnotSuccessful”.
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Totroubleshootthis,checkthefollowing:
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1) VerifythatOptgModeissetto“mandeact”usingthefollowingmenupath:
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Params&Display>O2Contr/Alarm>Gas/OilSettings>OptgMode
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2) VerifythatLowfireAdaptPtNoissetto2(combustioncurvepoint2)orhigherifdesired.By
default,thisparameterissetto“X”(undefined).
Themenupathforthisparameteris:
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Params&Display>O2Contr/Alarm>Gas/OilSettings>ControlParam>
LowfireAdaptPtNo
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3) Ifbothoftheaboveparametersaresetcorrectly,thenitispossiblethattheO
2
readingson
theratiocontrolcurveweresetincorrectly.WhensettingeachpointontheO
2
control
curve,theLMV5willpromptwiththemessage“WhenvaluestablecontinuewENTER”.
PressingENTERthensetsthe%O
2
fortheratiocontrolcurve.IfENTERispressedtooearly
beforetheO
2
valuehasstabilized,anon‐representativeO
2
valuewillbeenteredforthe
ratiocontrolcurve.Ifthisisthecase,gobackintotheO
2
controlcurveandateachpoint
waittogetastablereadingbeforepressingENTERtoensurethattheO
2
readingis
representativeofthecurrentairdamperposition.30‐60secondsisnottoolongtowait
oncethearrow(>)turnsintoacolon(:)indicatingthattheactuatorshavestoppedmoving.
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