User's Manual

XT30/XT50 Installation Guide Digital Monitoring Products
7
InstallatIon
4.2 Mounting Keypads
DMPkeypadshaveremovablecoversthatallowthebasetobemountedonawallorotheratsurfaceusing
the screw holes provided on each corner.
Formountingkeypadsonsolidwalls,orforapplicationswhereconduitisrequired,useaDMP695or696
keypadconduitbackbox.
4.3 Installation Specications
Severalfactorsdeterminetheperformancecharacteristicsofthekeypadbus:thelengthofwireused,the
numberofdevicesconnected,andthevoltageateachdevice.Whenplanningakeypadbusinstallation,
keepinmindthefollowingfourspecications:
1.DMPrecommendsusing18or22-gaugeunshielded wireforallkeypadcircuits.Do not use twisted pair
orshieldedwireforkeypadbusdatacircuits.
2.Onkeypadbuscircuits,tomaintainauxiliarypowerintegritywhenusing22-gaugewiredonotexceed
500feet.Whenusing18-gaugewiredonotexceed1,000feet.Toincreasethewirelengthortoadd
devices, install an additional power supply.
Note:Eachpanelallowsaspecicnumberofsupervisedkeypads.Addadditionalkeypadsinthe
unsupervisedmode.Refertothepanelinstallationguideforthespecicnumberofsupervisedkeypads
allowed.
3.Maximumdistanceforanyonebuscircuit(lengthofwire)is2,500feetregardlessofthewiregauge.
This distance can be in the form of one long wire run or multiple branches with all wiring totaling no
morethan2,500feet.Aswiredistancefromthepanelincreases,DCvoltageonthewiredecreases.
4.Maximumvoltagedropbetweenthepanel(orauxiliarypowersupply)andanydeviceis2.0VDC.Ifthe
voltage at any device is less than the required level, add an auxiliary power supply at the end of the
circuit.Whenvoltageistoolow,thedevicescannotoperateproperly.
Foradditionalinformationrefertothe710InstallationSheet(LT-0310)andortheLX-Bus/KeypadBusWiring
ApplicationNote(LT-2031).
Primary Power Supply
5.1 AC terminals 1 and 2
Connectthetransformerwirestoterminals1and2onthepanel.Usenomorethan70ft.of16gauge,or
40ft.of18gauge,wirebetweenthetransformerandthepaneltodeliveraminimumof15.5VACwhen
500mAofcurrentdrawisusedfromtheauxiliarypowersupplyterminal7.
Always ground the panel before applying power to any devices: The panel must be properly grounded
before connecting any devices or applying power to the panel. Proper grounding protects against
ElectrostaticDischarge(ESD)thatcandamagesystemcomponents.SeeEarthground,intheSecondary
Power Supply section.
5.2 Transformer Types
Thetransformerforthepanelis16.5VAC40VA,whichprovidesupto1.5Ampsofbelloutputcurrent,
500mAofauxiliarycurrent,and100mAofsmokedetectoroutput.UseeithertheModel320wire-inor
321plug-intransformerwiththepanel.Thetotalcurrentavailableislimitedbythetotalbatterystandby
requirements of the installation.
 Thetransformermustbeconnectedtoa120VAC60Hzcommercialpoweroutletthatisnotcontrolledbya
wall switch. Never share the transformer output with any other equipment.
5.3 Power LED
WheneitherACtransformerpowerorDCbatterypowerisconnectedtothepanelthePWRLEDshowssteady
green.