Siemens LMV51.140C1 - Using the O Alarm Functionality Without O Trim

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page25 Section6
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4. InitContr–O
2
controlispreparingtoengagebutisstilllocked
5. LockTLoad–O
2
controlisengagedbutlocked(inpre‐control)duetoaloadchange
6. Active–O
2
controlisactivelytrimmingbasedonsetpointandmeasuredO
2
value
7. LockTCAct‐O
2
controlisengagedbutlockedduetoanexcursionfromsetpoint

IfthestateoftheO
2
controlisshownas"locked",parameterDiagRegStatewillshowthereasonwhy.
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DiagRegState
Menupath:Params&Display>O2Contr/Alarm>ProcessData
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ThisparametershowsthereasonthattheO
2
controlislocked.Possiblevaluesare:
0–TheloadisbelowtheloadlimitsetbyparameterO2CtrlThreshold
1–Theloadcontrollerisinautotune
2–TheO
2
sensorisbeingtestedforresponse(self‐checkofO
2
sensor)
3–Thefuel‐airratioorO
2
trimcurvesarebeingprogrammed
4–Themeasured%O
2
isabovetheleanlimitorbelowtherichlimit
5–ThereisanerrorinthePLL52module
6–Thereisanerrorinthepre‐control
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UsingtheO
2
AlarmFunctionalitywithoutO
2
Trim

Aswaspreviouslymentioned,theO
2
systemcanberunindifferentmodes.Themodesaresetusing
parameterOptgMode,whichcanbefoundusingthefollowingmenupath:

Menupath:Params&Display>O2Contr/Alarm>Gas/OilSettings
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Theavailableoperatingmodesare:
1. Mandeact‐deactivatesallO
2
trimandO
2
alarmfunctionality.%O
2
valuecanstillbeviewed.
2. O2Limiter‐OnlytheO
2
alarmisactive.Thismeansthatalockoutwilloccuriftheleanlimit(O2
MaxValue)isexceededforatimelongerthanwhatissetforparameterTimeO2Alarm.Likewise,a
lockoutwilloccuriftherichlimit(O
2
alarmcurve)isexceededforatimelongerthanwhatissetfor
parameterTimeO2Alarm.Notrimfunctionalityisactive.
3. O2Control‐ThesameasO2Limiter,exceptO
2
trimisnowenabled.Exceedingrichorleanlimits
willcausealockoutinthesamewayastheO2Limitermode.
4. ConAutoDeac–Inthismode,exceedingtherichorleanlimitswillnotcauseanimmediatelockout.
ExceedingtherichorleanlimitswillcausetheO
2
trimtobetemporarilydeactivated.Afterawaiting
timeof3timesTau,themeasured%O
2
willbere‐evaluated.Ifthe%O
2
ishigherthantherichalarm,
theO
2
trimwillbedeactivated.Ifthe%O
2
islowerthantherichalarm,alockoutwilloccur.TheO
2

trimcanbeautomaticallydeactivatedandreactivatedthenumberoftimesallowedbyparameter
NumMinUntilDeact.Themaximumse ttingis5.Ifmorethan5deactivationsandreactivations
occur,thentheO
2
trimmodewillbechangedto“autodeact”untiltheO
2
trimcontrolismanually 
re‐activated.
5. Autodeact‐indicatesthattheO
2
trimhasbeenautomaticallydeactivatedforsomereason.See
errorcodesinSection7.Donotselectthismode.
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