User's Manual

Digital Monitoring Products XT30/XT50 Installation Guide
8
InstallatIon
Secondary Power Supply
6.1 Battery Terminals 3 and 4
Connecttheblackbatteryleadtothe
negative battery terminal. The negative
terminal connects to the enclosure
groundinternallythroughtheXT30or
XT50 circuit board. Connect the red
battery lead to the positive battery
terminal.Observepolaritywhen
connecting the battery.
Add a second battery in parallel
usingtheDMPModel318DualBattery
Harness. DMP requires each battery
be separated by a PTC in the battery
harness wiring to protect each battery
from a reversal or short within the
circuit. See Figure 4.
Use sealed lead-acid batteries only: Use12VDCsealedlead-acidrechargeablebattery.Batteriessupplied
byDMPhavebeentestedtoensureproperchargingwithDMPproducts.
GEL CELL BATTERIES CANNOT BE USED WITH THE XT30/XT50 PANEL.
6.2 Earth Ground
Terminal4ofthepanelmustbeconnectedtoearthgroundusing14gaugeorlargerwiretoprovideproper
transientsuppression.DMPrecommendsconnectingtoametalcoldwaterpipeorgroundrodonly.Donot
connect to electrical conduit or a telephone company ground.
6.3 Replacement Period
DMPrecommendsreplacingthebatteryevery3to5yearsundernormaluse.
6.4 Discharge/Recharge
Thepanelbatterychargingcircuitoatchargesat13.9VDCatamaximumcurrentof1.2Ampsusinga40VA
transformer.Thetotalcurrentavailableisreducedbythecombinedauxiliarycurrentdrawfromterminals7,
11,and25.Thevariousbatteryvoltagelevelsarelistedbelow:
BatteryTrouble: Below 11.9VDC
BatteryRestored: Above 12.6VDC
6.5 Battery Supervision
The panel tests the battery once every hour when AC power is present. This test occurs 15 minutes past
eachhourandlastsforveseconds.Aloadisplacedonthebatteryandifitsvoltagefallsbelow11.9VDCa
low battery is detected. If AC power has failed, a low battery is detected any time the battery voltage falls
below11.9VDC.
If a low battery is detected with AC power present, the test is repeated every two minutes until the battery
chargesabove12.6VDC;thebatteryrestoredvoltage.Ifafaultybatteryisreplacedwithafullycharged
battery, the restored battery will not be detected until the next two-minute test is done.
6.6 XT30/XT50 Power Requirements
During AC power failure, the panel and all auxiliary devices connected draw their power from the battery.
Alldevicesmustbetakenintoconsiderationwhencalculatingthebatterystandbycapacity.Onthefollowing
pageisalistofthepowerrequirementsofthepanel.AddtheadditionalcurrentdrawofDMPkeypads,
smokedetectoroutput,andanyotherauxiliarydevicesusedinthesystemforthetotalcurrentrequired.
The total is then multiplied by the total number of standby hours required to arrive at the total Ampere-
hours required.
AC
1234
+BAC –B
318 Battery
Harness
Panel Red and
Black Battery Cables
Red
Black
Battery
Battery
Red
Black
56
BELL GND
To AC
14 AWG to
Earth Ground
XT30/XT50
Command Processor
Panel
PTC
To Bell
Circuit
Figure 4: Wiring Multiple Batteries