Siemens LMV5 Series Technical Instructions

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page13 Section7
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O2SensorisNotReading
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IftheO
2
valueonthemainscreenisdisplayedas“XXXX”,checkthefollowing:
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1. EnsurethattheQGO20O
2
sensorisactivatedthroughthefollowingmenupath:

Params&Display>O2Module>Configuration>O2Sensor=QGO20
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2. ThePLL52O
2
modulecontrolstheQGO20O
2
sensor’sheatertoachieveasensor
temperatureofapproximately1292
o
F.Thesensorcannotread%O
2
ifthesensorisbelow
1202
o
F.CheckthetemperatureoftheQGO20sensorthroughthefollowingmenupath:
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 Params&Display>O2Module>ProcessData>QGOSensorTemp
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Ifthetemperatureisbelow1202°F,checktheheatingloadtotheO
2
sensor:
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 Params&Display>O2Module>ProcessData>QGOHeatingLoad
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ThemaximumQGOheatingloadis60%.Iftheheatingloadisatornear60%,theQGO20
sensortemperatureshouldbeincreasing.Ifitis,theO
2
sensorwillbeginreadingoncethe
temperatureisover1202°F.Ifthetemperatureisnotincreasing,checkthefollowing:
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 Thestackvelocitymaybetoohigh,thuscoolingthesensor.Themaximumstack
velocityis33ft/second.
 ThewiringbetweentheO
2
sensorandthePLL52O
2
modulemaybeincorrect.Refer
toSection2tocheckthewiringbetweenthetwodevices.
 TheheatingelementintheQGO20O
2
sensormaybedamaged.Measurethe
resistancebetweenterminalsQ4andQ5ontheQGO20O
2
sensor.Thereshouldbe
between5and150Ohmsbetweentheseterminals.Ifthereisanopencircuit
betweenthesetwoterminals,theheatingelementhasbeendamagedandthe
QGO20O
2
sensorneedstobereplaced.
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Note:TheQGO20sensorcantakeuptotwohourstoachieveoperatingtemperatureonthe
initialstartup.
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Siemens LMV5 Series Specifications

General

Brand	Siemens
Model	LMV5 Series
Category	Control Systems
Language	English