Siemens LMV5 Series - Page 194

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section6 Page22SCCInc.


barometricpressurethatexistedduringO
2
ControlCurvecommissioning,themanipulatedvariablemust
changetokeepthesame%O
2
inthestack.AnexampleisdonebelowandillustratedinFigure6‐9:

AirtemperatureduringO
2
ControlCurvecommissioning=80°F
BarometricpressureduringO
2
ControlCurvecommissioning=30.0inHg

Maximumexpectedairtemperature=120°F(+40°Fcomparedtocommissioning)
Minimumexpectedairtemperature=30°F(‐50°Fcomparedtocommissioning)
Maximumexpectedbarometricpressure=31.5inHg(+1.5inHgcomparedtocommissioning)
Minimumexpectedbarometricpressure=28.0inHg(‐2.0inHgcomparedtocommissioning)

UsingFigure6‐8andtheinformationabove,thefollowingvaluescanbefound:

O2MaxManVariable=13
O2MinManVariable=‐16

Sinceothersmallfactorsexistthatcanchange(heatingvalueofthefuel,changeindraft,etc.),itis
suggestedthatanadditional5%areaddedtothemaxandsubtractedfromthemin,givingthefollowing
settings:

O2MaxManVariable=18
O2MinManVariable=‐21



Figure6‐9:FindingtheTheoreticalMaxandMinManipulatedVariableforGivenConditions

HOME