Weighing System Surge protector
User Manual
SP151
©ꢀExcellꢀPrecisionꢀLimitedꢀ2012.ꢀ ꢀ AllꢀrightsꢀreservedꢀWorldwide.ꢀ
TheꢀinformationꢀcontainedꢀhereinꢀisꢀtheꢀpropertyꢀofꢀExcellꢀPrecisionꢀLimitedꢀ
andꢀisꢀsuppliedꢀwithoutꢀliabilityꢀforꢀerrorsꢀorꢀomissions.ꢀ ꢀ Noꢀpartꢀmayꢀbeꢀ
reproducedꢀ orꢀ usedꢀ exceptꢀ asꢀ authorisedꢀ byꢀ contractꢀ orꢀ otherꢀ writtenꢀ
permission.ꢀ ꢀ Theꢀ copyrightꢀ andꢀ theꢀ foregoingꢀ restrictionꢀ onꢀ reproductionꢀ
andꢀuseꢀextendꢀtoꢀallꢀmediaꢀinꢀwhichꢀtheꢀinformationꢀmayꢀbeꢀembodied.ꢀ
EXCELL PRECISION CO., LTD
SP151 Weighing System Surge Protector
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Theꢀhighꢀperformanceꢀsurgeꢀprotectorꢀdeviceꢀappliesꢀtoꢀ4ꢁꢀorꢀ6ꢁwireꢀloadꢀcellꢀ
weighingꢀsystemsꢀorꢀotherꢀrelatedꢀapplications.ꢀ
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1. General
SP151ꢀSurgeꢀProtectorꢀisꢀdesignedꢀforꢀaccessingꢀdirectꢀintoꢀtheꢀcablingꢀofꢀtheꢀweighingꢀ
system,ꢀinꢀorderꢀtoꢀpreventꢀtheꢀloadꢀcellsꢀandꢀotherꢀsensitiveꢀelectronicꢀcomponentsꢀfromꢀ
damageꢀbyꢀaꢀnearꢀsurgeꢀstrikeꢀorꢀpowerꢀfailure.ꢀSurgeꢀprotectorꢀworksꢀatꢀtheꢀlocalꢀonly,ꢀ
therefore,ꢀSP151ꢀdevicesꢀshouldꢀbeꢀinstalledꢀonꢀbothꢀendsꢀofꢀcircuitryꢀloop.ꢀ
ꢀ
Aꢀcompleteꢀsystemꢀprotectionꢀrequiresꢀadditionalꢀsurgeꢀprotectionꢀdevice(s)ꢀtoꢀensureꢀ
thatꢀotherꢀitems,ꢀsuchꢀasꢀACꢀpower,ꢀexternalꢀprinters,ꢀmainframes,ꢀandꢀtelephoneꢀandꢀsoꢀ
on.ꢀ
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2. Installation
Theꢀfollowingꢀrecommendationꢀisꢀonlyꢀasꢀaꢀreference.ꢀTakeꢀintoꢀaccountꢀofꢀlocalꢀconditions,ꢀ
theꢀinstallationꢀshouldꢀalwaysꢀbeꢀcarriedꢀoutꢀbyꢀprofessionals.ꢀ
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2.1 Siting
SP151ꢀshouldꢀbeꢀsetꢀwithinꢀ3mꢀfromꢀtheꢀloadꢀcellsꢀorꢀsystemsꢀtoꢀbeꢀprotected.ꢀForꢀtheꢀ
maximumꢀdegreeꢀofꢀprotection,ꢀSP151ꢀshouldꢀbeꢀusedꢀatꢀbothꢀendsꢀconcurrentlyꢀofꢀtheꢀ
interconnectedꢀcables.ꢀInꢀgeneral,ꢀinstallꢀaꢀprotectiveꢀdeviceꢀbetweenꢀtheꢀjunctionꢀboxꢀandꢀ
loadꢀcellsꢀsetꢀ(Figureꢀ1).ꢀSomeꢀsystemsꢀspecifyꢀloadꢀcellꢀindividualꢀcable(s),ꢀprotectionsꢀareꢀ
neededꢀforꢀeveryꢀloadꢀcellꢀ(Figureꢀ2).ꢀWithinꢀtheꢀweighbridge,ꢀtheꢀSP151ꢀshouldꢀbeꢀsetꢀ
closeꢀtoꢀtheꢀindicationꢀsystems,ꢀtheꢀinterconnectingꢀcablesꢀmustꢀbeꢀseparatedꢀbyꢀatꢀ
leastꢀ50mmꢀfromꢀotherꢀirrelevantꢀcables.ꢀ
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1ꢀ
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Loadꢀ ꢀ
Cellꢀ
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Loadꢀ ꢀ
Cellꢀ
Juctionꢀ
Boxꢀ
Loadꢀ ꢀ
Cellꢀ
Loadꢀ ꢀ
Cellꢀ
SP151ꢀ
Connectionꢀtoꢀweightꢀcabinꢀ
LocalꢀStructuralꢀearthꢀbondꢀ
Figureꢀ1ꢀ
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Loadꢀ ꢀ
Cellꢀ
Loadꢀ ꢀ
SP151ꢀ
Cellꢀ
SP151ꢀ
Loadꢀ ꢀ
SP151ꢀ
Cellꢀ
Loadꢀ ꢀ
Cellꢀ
SP151ꢀ
Figureꢀ2ꢀ
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2.2 Securing
ꢀ
◄ꢀ ꢀ SP151ꢀshouldꢀbeꢀmountedꢀvertically,ꢀandꢀ
theꢀcableꢀshouldꢀbeꢀconnectedꢀupsideꢀ
downꢀtoꢀavoidꢀwaterꢀfromꢀseepage.ꢀ
ꢀ
ꢀ
3ꢀ
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▼ꢀSP151ꢀsealingꢀringꢀhasꢀ4ꢀmountingꢀholesꢀwithꢀcenterꢀtoꢀcenterꢀspacingꢀofꢀ ꢀ
113.5ꢀ×ꢀ113.5ꢀmm.ꢀꢀ
UsingꢀM4x16ꢀorꢀM4x20ꢀroundꢀheadꢀscrewꢀtoꢀsecureꢀtheꢀSurgeꢀProtectorꢀboxꢀontoꢀtheꢀ
mountingꢀsurface.ꢀ
ꢀ
ꢀ
ꢀ
UsingꢀM4x16ꢀorꢀM4x20ꢀroundꢀheadꢀ
screwꢀtoꢀsecureꢀtheꢀSurgeꢀProtectorꢀ
boxꢀontoꢀtheꢀmountingꢀsurface.ꢀ
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4ꢀ
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Lockꢀattachedꢀtoꢀtheꢀscrewꢀsizeꢀ
ꢀ
ꢀ
Theꢀscrewꢀdiameterꢀisꢀ4mm,ꢀandꢀ7mmꢀforꢀtheꢀheadꢀdiameterꢀ(M4ꢀscrewsꢀminimumꢀlengthꢀ
isꢀ16mm).ꢀTheꢀstainlessꢀsteelꢀscrewsꢀareꢀrecommendedꢀtoꢀuseꢀforꢀsecuringꢀpurpose.ꢀꢀꢀ
Cablesꢀwithinꢀ200mmꢀfromꢀSP151ꢀshouldꢀbeꢀsupportedꢀandꢀfixedꢀtoꢀpreventꢀtheꢀcableꢀ
connectorꢀfromꢀunableꢀtoꢀsupportꢀtheꢀweightꢀofꢀtheꢀcable.ꢀ
ꢀ
5ꢀ
ZSME000000016ꢀ
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2.3 Grounding
Properlyꢀgroundingꢀcanꢀonlyꢀelaborateꢀtheꢀperformanceꢀofꢀaꢀsurgeꢀprotector.ꢀToꢀselectꢀtheꢀ
weldingꢀpointꢀbyꢀreferringꢀtoꢀtheꢀlocalꢀvoltage,ꢀallꢀtheꢀweldingꢀpointsꢀwillꢀshareꢀtheꢀꢀ
commonꢁmodeꢀvoltageꢀtoꢀtheꢀground.ꢀTheꢀweldingꢀpointꢀisꢀconnectedꢀtoꢀtheꢀlocalꢀgroundꢀ
networkꢀorꢀgroundꢀrodꢀsystem;ꢀhence,ꢀnoꢀextraꢀgroundꢀnetworkꢀorꢀgroundꢀrodꢀsystemꢀisꢀ
neededꢀtoꢀbeꢀinstalled.ꢀ
ꢀ
Properꢀgroundingꢀisꢀtheꢀlocalꢀstructureꢀofꢀtheꢀdeviceꢀ(Figureꢀ1ꢀandꢀFigureꢀ2),ꢀnoꢀmatterꢀ
connectedꢀtoꢀtheꢀsteelꢀconnectionꢀofꢀmetalꢀorꢀreinforcedꢀconcreteꢀweighbridge.ꢀFromꢀtheꢀꢀ
groundingꢀboltꢀM8ꢀexternalꢀconnectꢀtoꢀtheꢀgroundꢀwireꢀofꢀtheꢀgroundingꢀpointꢀ(10mm2mmꢀ
copperꢀorꢀequivalentꢀmetalꢀwireꢀorꢀribbon).ꢀTheꢀcombinationꢀthatꢀlessꢀthanꢀ3mꢀdevelopsꢀforꢀ
optimumꢀperformance.ꢀUseꢀproperꢀamountꢀofꢀpreservativesꢀtoꢀprotectꢀtheꢀexposedꢀmetal.ꢀ
ꢀ
Inꢀloadometerꢀ(weighbridge)ꢀorꢀcontrolꢀroom,ꢀSP151ꢀsurgeꢀprotectorꢀshouldꢀbeꢀlocatedꢀ
closeꢀtoꢀtheꢀweighingꢀcomputerꢀorꢀdashboardꢀdisplay,ꢀandꢀtheꢀgroundꢀwireꢀshouldꢀbeꢀ
connectedꢀtoꢀindependentꢀgroundingꢀrodsꢀofꢀtheꢀACꢀpower.ꢀGroundꢀwiresꢀthatꢀmoreꢀthanꢀ
3mꢀlong,ꢀaꢀgroundꢀbetweenꢀtheꢀSP151ꢀwithꢀtheꢀinstrumentꢀisꢀneededꢀ(SeeꢀFigureꢀ4).ꢀ
ꢀ
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GroundingꢀWireꢀ
※ꢀTightenꢀtheꢀstudꢀM8ꢀupward
Earthing/groundingꢀ ꢀ
M8
studꢀM8ꢀ
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6ꢀ
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2.4 Connections
Twoꢀterminalsꢀareꢀprovided,ꢀlabeledꢀ"Fieldꢀcable”ꢀandꢀ“Instrumentꢀcable”.ꢀFieldꢀcableꢀisꢀtheꢀ
independent,ꢀexposedꢀcableꢀbetweenꢀtheꢀweighbridgeꢀandꢀweighingꢀcabin.ꢀInstrumentꢀorꢀ
loadꢀcellꢀcableꢀisꢀaꢀlocallyꢀshortꢀconnection,ꢀsuchꢀasꢀfromꢀSP151ꢀtoꢀtheꢀjunctionꢀbox,ꢀ
independentꢀloadꢀcellꢀorꢀweighingꢀscale.ꢀEquipmentsꢀconnectedꢀtoꢀtheꢀterminalꢀareꢀsubjectꢀ
toꢀSP151ꢀprotection.ꢀ
ꢀ
SP151ꢀallowsꢀtheꢀ4ꢁwireꢀ(SIG1,ꢀSIG2,ꢀEXC1,ꢀEXC2)ꢀorꢀlineꢀ6ꢀ(SIG1,ꢀSIG2,EXC1,ꢀEXC2,ꢀꢀ
SENSE1,ꢀSENSE2)ꢀasꢀwellꢀasꢀtwoꢀisolatedꢀlines.ꢀTheꢀfunctionꢀofꢀeachꢀterminalꢀisꢀclearlyꢀ
markedꢀonꢀtheꢀjunctionꢀbox.ꢀ ꢀ
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Theꢀisolatedꢀlinesꢀconnectedꢀtoꢀfieldꢀcablesꢀandꢀinstrumentationꢀcablesꢀareꢀnotꢀconnectedꢀ
withꢀtheꢀgroundꢀwireꢀofꢀtheꢀSP151ꢀwithoutꢀaffectingꢀtheꢀgroundꢀoperationꢀofꢀtheꢀgeneralꢀ
weighingꢀsystem.ꢀ
Ifꢀyourꢀvendorꢀrequiresꢀtheꢀisolatedꢀlinesꢀtoꢀbeꢀgrounded,ꢀitꢀshouldꢀbeꢀconnectedꢀtoꢀ
theꢀjunctionꢀboxꢀorꢀloadꢀcell.ꢀ ꢀ
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Cableꢀthroughꢀtheꢀcableꢀsealꢀsleeve,ꢀstrippedꢀandꢀattachedꢀtoꢀtheꢀcorrespondingꢀꢀ
connectionsꢀareꢀclearlyꢀmarkedꢀandꢀtheꢀsubsequentꢀfailureꢀdetectionꢀwouldꢀbeꢀeasier.ꢀ
Ensureꢀthatꢀtheꢀsealꢀsleeveꢀcasingꢀisꢀtight,ꢀandꢀthenꢀlockꢀtheꢀlid.ꢀ
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FieldꢀCableꢀ
ACꢀ Powerꢀ feedꢀ
(Unprotected)ꢀ
SP151ꢀ
Earth/Groundꢀ
Connectionꢀ
Instrumentationꢀ
orꢀCellꢀCableꢀ
*
Subsidiaryꢀearthꢀ
bondꢀifꢀ ꢀ
earth/groundꢀlinkꢀ
>3m/10ft
ꢀ
ConsumerꢀUnitꢀ
WeighꢀComputerꢀ
Figureꢀ4ꢀ
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3. Maintenance
Note:ꢀForꢀcertifiedꢀsystems,ꢀyouꢀmustꢀconfirmꢀthatꢀtheꢀsystemꢀcanꢀbeꢀ
reꢁcalibrated.ꢀBeforeꢀtearingꢀoffꢀtheꢀsealꢀforꢀmaintenance,ꢀaꢀnewꢀcalibrationꢀsealꢀisꢀrequiredꢀ
forꢀreplacingꢀafterꢀtheꢀmaintenance.ꢀ
Processingꢀtheꢀmaintenanceꢀeveryꢀtheꢀotherꢀyear.ꢀ(higherꢀrepairꢀandꢀmaintenanceꢀꢀ
frequencyꢀforꢀparticularlyꢀharshꢀenvironments)ꢀ
3.1ꢀꢀCheckꢀSP151ꢀtoꢀseeꢀifꢀitꢀisꢀsurroundedꢀbyꢀintactꢀandꢀsealedꢀcorrectly.ꢀ
3.2ꢀꢀRemoveꢀtheꢀchassisꢀcoverꢀandꢀconfirmꢀthatꢀtheꢀsealingꢀeffect,ꢀifꢀnecessary,ꢀtoꢀreplaceꢀ
theꢀdamagedꢀsealꢀstrip.ꢀ ꢀ
3.3ꢀꢀCheckꢀallꢀinternalꢀcablesꢀlabeled.ꢀ
3.4ꢀ Checkꢀtheꢀtightnessꢀofꢀallꢀconnectedꢀcables,ꢀandꢀrepairꢀanyꢀlooseꢀorꢀdamagedꢀ
connections.ꢀ
3.5ꢀ Checkꢀtheꢀinternalꢀandꢀexternalꢀgroundingꢀline,ꢀtightenꢀitꢀifꢀloose.ꢀ
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4. Troubleshooting
Whenꢀtheꢀelectronicꢀcircuitꢀsystemꢀsufferedꢀfromꢀsurgeꢀstruck,ꢀitꢀwillꢀoperateꢀautomaticallyꢀ
andꢀselfꢁrecovery.ꢀTheꢀSP151ꢀserviceꢀlifespanꢀcouldꢀbeꢀaroundꢀ20ꢀyears,ꢀdependsꢀonꢀtheꢀ
lifespanꢀofꢀtheꢀprotectionꢀcomponentsꢀofꢀtheꢀprimaryꢀgasꢀdischargeꢀtube.ꢀ
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Attentionꢀ
FieldꢀcableꢀthatꢀconnectedꢀtoꢀtwoꢀSP151ꢀofꢀtheꢀinstrumentation,ꢀtheꢀisolatedꢀlinesꢀmustꢀbeꢀ
connectedꢀandꢀwithꢀaꢀdrainꢀofꢀpipeline.ꢀ
Whenꢀtheꢀisolatedꢀlinesꢀsufferedꢀfromꢀtheꢀsurge,ꢀtheꢀgasꢀdischargeꢀtubeꢀwillꢀdischargeꢀtoꢀ
theꢀearthꢀtoꢀimproveꢀtheꢀoverallꢀprotection.ꢀ
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8ꢀ
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