User's Manual

1/28/2015 LMU42x0Hardware&InstallationGuidePULSWiki
https://puls.calamp.com/wiki/LMU42x0_Hardware_%26_Installation_Guide 34/47
Donotcutcables.Instead,coilanyexcesscablelength,makingsurenottocrimporflattentheantennacable.
5.2.7MoistureandWeatherProtection
TheLMUunitmustbelocatedwhereitwillnotbeexposedtomoistureorwater.Inatypicalinstallationinside
avehiclethisisnotcommonlythoughttobeaconcern;however,itmightbebesttoavoidlocatingtheLMU
belowacar’scupholders,orwhererainmighteasilysplashintothecompartmentwhenadoorisopened.
5.2.8PreventingAccidentalorUnauthorizedModification
IfyouanticipatethatfleetdriversorothersmightinterferewiththeLMUsoncetheyareinstalled,takestepsto
besurethatitisnoteasytodisconnecttheantennawiring,removetheLMUfromitspowersource,etc.
TwocommonmethodsaretheuseofTamperProofSealantorcreationofPEGScripttodetectpowerlossor
GPSantennadisconnections.
5.3InstallingtheLMUinaVehicle
ThissectionprovidesinstructionsforinstallinganLMUinavehicle.
Besuretoconsiderthedesigndecisionsdescribedintheprevioussections.Whenyouarereadytobegin
installingtheLMU,followthesesteps:
5.3.1PlacetheLMUunitinthevehicle.
Typically,theLMUshouldbeplacedunderthepassengerseatordashboardofthevehicle.LMUswithinternal
antennasshouldbeplacedtomaximizetheirGPSperformance.Atypicallocationincludeunderthedashclose
tothefrontwindshield.
AttachtheLMUtothesolidbodyofthevehicle,nottoplasticpanels.TheLMUcanbeplacedoutofsightby
removinginteriortrimandmoldingtoexposeavailablespace,thenreplacingthetrimoncetheLMUisin
place.
5.3.2Connectpower,ignition,andground.
Thepowerinput(redwire)mustbeconnectedtoaconstant(unswitched)+12VDCor+24VDCsupply;
preferably,connecteddirectlytothevehiclebatteryterminalorasclosetoitaspossible.Thisconnectionpoint
shouldbefuseprotectedtonotmorethan5Amps.
Theignitioninput(whitewire)mustbeconnectedtothevehicleignitionoranotherappropriatekeyoperated
line,suchasACCESSORY,ensuringthatpowertotheignitionwireisavailableonlywhenthevehicleignition
ison.
Thegroundline(blackwire)mustbeconnectedtochassisground.
Failuretoconnecttheselinesinthemannerdescribedmayresultindischargeofthevehiclebattery.