Siemens LMV52.240B1 - Post Commissioning Tuning

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section6 Page20SCCInc.
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PostCommissioningTuning
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AftertheO
2
curveshavebeensetupaccordingtotheproceduresabove,someadditionalburner/boiler
specifictuningmaybenecessarytokeeptheO
2
trimoperatingproperly.Whenandhowtousethese
tuningparametersisdiscussedbelow.

LoadCtrlSuspend‐ThissetstheloadchangethatisnecessarytomaketheO
2
trimtransitionfromactive
O
2
trimtopre‐control.Manyfactorsinfluencethesettingofthisparameter.
Menupath:Params&Display>O2Contr/Alarm>GasSettings>ControlParam
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Highersettings(moreactivetrim,lesspre‐control)canhelptheO
2
trimstayclosetosetpointinthe
followingsituations:

1. TheO
2
ControlCurveisrelativelyflatfromlowfiretohighfire(varieslessthan0.5%O
2
)
2. Themodulationramptimeisslow(OperatRampModissetto60seconds ormore)
3. Thedelaytime(Tautime)oftheboilerisrelativelyfast(TauLow‐Fireissetto7secondsorless)

Lowersettings(lessactivetrim,morepre‐control )canhelptheO
2
trimstayclosetosetpointinthe
followingsituations:

1. TheO
2
ControlCurveslopesfromlowfiretohighfire(variesmorethan0.5%O
2
)
2. Themodulationramptimeisfast(OperatRampModissetto30seconds)
3. Thedelaytime(Tautime)oftheboilerisslow(TauLow‐Fireissetformorethan7seconds)

O2TrimBehavior‐IfparameterStartmodeissetto“standard”,thissettingcontrolshowtheO
2
trim
respondsifthemeasuredO
2
valuestartstomoveawayfromtheO
2
setpointsignificantly.
Menupath:Params&Display>O2Contr/Alarm>GasSettings>ControlParam
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1. Asettingof“ForcedAirAdd”willhelpifdeactivationsareduetotherichlimit(O
2
alarm)sinceairwill
beaddedmoreaggressively.
2. Asettingof“ForcedAirRed”willhelpifdeactivationsareduetothelean limit(O2MaxValue)since
airwillbesubtractedmoreaggressively.
3. Asettingof“symmetric”isusedwhentherichlimit(O
2
alarm)andtheleanlimit(O2MaxValue)are
relativelyclosetogether,andanaggressivecorrectioninonedirectionmightcauseadeactivation
duetotheotherlimit.
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NOTE:OnanLMV52.440withtheStartModesettosomethingotherthan“standard”,thesettingof
O2TrimBehaviorhasnoeffect.

O2ModOffset‐Duringalo
adchangewhenthepre‐controlbecomesactive(seeLoadCtrlSuspend),this 
willtemporarilyaddmoreair
beyondwhatisprescribedbytheLambdaFactor.Increasingthissetting
canhelpwithrichlimit(O
2
alarm)deactivationsduringmodulation,butthisparametershouldnotbe
usedasasubstituteforproperO
2
trimcommissioningprocedures.
Menupath:Params&Display>O2Contr/Alarm>GasSettings>ControlParam
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