Siemens LMV51.140C1 - Open Circuit; Short Circuit Sensor Faults - Error Code A6 (Diagnostics 50

LMVSeriesTechnicalInstructions 
DocumentNo.LV5‐1000
SCCInc. Page9 Section7

OpenCircuit/ShortCircuitSensorFaults–ErrorCodeA6(Diagnostics50…5A)

AnerrorcodeA6(diagnosticcode50…5A)meansthattheLMV5isconfiguredforacertaintype
ofsensor,butitisnotdetectingthatthesensorisconnected.Thismeansthataparameterin
theLMV5issetincorrectly,thewiringofthesensorisincorrect,orthesensorhasfailed.

Note:SomeofthefaultcodemessagesrefertoInput2orInput3.Input2isterminalX61
whichisusedforpressuresensors.Input3isterminalX62whichisusedforremotesetpoint
andmodulationsignals.

Checkthefollowing:

1. Ensurethattheparametersusedtoprogramtheanaloginputsaresetcorrectly:

 LC_OptgMode
 SensorSelect

ExtInpX61U/I
 ExtInpX62U/I

SeeSection3forinformationonhowtheseparametersshouldbeset.

2. Ifalloftheaboveparametersaresetcorrectly,checkthewiringoftheattachedsensors.
SeeSection2forinformationonhowtowiresensorstotheLMV5.

3. Onasteamboiler,atemperaturesensorcanbeusedinadditiontothepressuresensorfor
the cold start function.If this is the case,checkthesettingof parameter AdditionalSens.
SeeSection3formoreinformationonhowtosetthisparameter.

4. AnadditionalFGRtemperaturesensorcanbeinstalledtoperformanFGRholdfunction.If
parameter FGR‐Mode is set to “temperature”, “temp.contr.”, or “TCautoDeact”, an FGR
sensorisexpectedtobewiredintoterminalX60orX86,dependingonthesettingofFGR‐
sensor.IfthisparameterissettoX60,checkthatthesensoriswiredcorrectly.

5. IfO
2
trimisbeingused,anambientairtemperaturesensorcanbewiredintoterminalX60.
Check the setting of parameter AirTempX60PT1000.If this is set to activated, a Pt1000
temperaturesensorisexpectedtobewiredintoterminalX60.








HOME