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LMVSeriesTechnicalInstructions 

DocumentNo.LV5‐1000

SCCInc. Page7 Section7

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FaultPositioningActuator–ErrorCode15(continued)

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6. Ifeverythingelsechecksoutokay,replacetheactuator.

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InternalFaultActuator–ErrorCode19

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SQM45andSQM48actuatorshavedualpotentiometersthatprovidefeedbacktotheLMV5to

verifyactuatorposition.Whenthesetwopotentiometersdisagree,theLMV5faultswithan

errorcode19.Thediagnosticcodewilldetailwhichactuatorishavingtheproblem.Ifanerror

code19isencountered,checkthefollowing:

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1. EnsurethatparameterallowedPot.diffissetto15.Thisallowsamaximumdisagreement

of1.5°betweenthetwopotentiometers.

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2. IfallowedPot.diffissetto15andtheLMV5continuestoreceiveerrorcode19,the

actuatormustbereplaced.Thelikelycauseofthedamagedactuatorisexcessivesideload

ontheactuatorshaftorexcessivevibration.Overtime,excessivesideloadontheactuator

shaftcanweardowntheshaftbearingsoftheac

tuator.Sincethepotentiometersare

mounteddirectlyontothebackoftheshaft,theywilldisagreemoreandmoreastheshaft

bearingswear.Excessivevibrationcanalsocausepotentiometerwearandleadtoanerror

code19.

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3. Itisimperativethatpropercouplingsareusedwhenmountingactuators.Itishighly

recommendedtouseanSCCflexiblecouplingonallactuators.SCCcouplingseliminate

excessivesideloadduetotheirdesign.Furthermore,SCCcouplingsallowupto1/16”of

parallelmisalignmentand3°ofangularmisalignmentbetweentheactuatorandvalve

shafts.SeeDocumentNo.CPBK‐1000formoreinformationonavailableflexiblecouplings.

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4. Itisalsoimportanttousearigidmountingbracketwhenmountinganyactuator.Excessive

vibrationovertimecanwearthepotentiometertracks.Ifthewearistoosevere,errorcode

19canresult.Rigidmountingbracketshelptominimizetheeffectsofvibration.SCCoffers

awidevarietyofbracketsandfullyassembledvalveactuatorassembliestoensureproper

mountingofactuators.SeeSection1formoredetails.

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