Digital Monitoring Products XR150/XR550 Series Installation Guide
10
INSTALLATION
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.
Always ground the panel before applying power to any devices: The XR150/XR550 Series 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 the Earth ground
section.
5.2 Transformer Types
Use Model 327 (16.5 Vac 50 VA) plug-in or Model 322/323 (16 Vac 56 VA), or 324/324P (16 Vac 100 VA) wire-in
transformer. Use Model 322/323 or 324/324P wire-in transformers when required by the Authority Having
Jurisdiction (AHJ).
The transformer must be connected to an unswitched 120 Vac 60 Hz electrical outlet with at least .87A of
available current. Never share the transformer output with any other equipment.
5.3 50VA-75VA 3-Pin Header for Transformer Types
Place the jumper on the left two pins labeled 50VA for a Maximum 2 Amp (Bell+Aux+Smoke+XBUS+LX500-LX900)
when using the Model 322/323 56VA, or 327 50VA plug-in transformer (default).
Place the jumper on the right two pins labeled 75VA for a Maximum 3 Amp (Bell+Aux+Smoke+XBUS+LX500-LX900)
when using the Model 324/324P 100 VA wire-in transformer.
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 XR150/
XR550 Series circuit board. Connect the red battery
lead to the battery positive terminal. Observe
polarity when connecting the battery.
You can 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 6.
Use sealed lead-acid batteries only: Use
the DMP Model 364 (12 Vdc 1.3Ah), Model
365 (12 Vdc 9 Ah), Model 366 (12 Vdc 18 Ah), Model 368 (12 Vdc 5.0 Ah), or Model 369 (12 Vdc 7 Ah) 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 XR150/XR550 SERIES PANEL.
6.2 Earth Ground (GND)
The XR150/XR550 Series panel terminal 4 can be connected to earth ground using 14 gauge or larger wire. Connect
to a cold water pipe, ground rod, or building ground when available. Connection to an electrical ground or conduit
can also be used. Gas pipes or sprinkler pipes should not be used. A ground connection is not required to provide
normal system operation.
6.3 Battery Only Restart
When powering up the XR150/XR550 Series panel without AC power, briey short across the battery start pads to pull
in the battery cutoff relay. The leads need a momentary short only. Once the relay has pulled in, the battery voltage
holds it in that condition. If the XR150/XR550 Series panel is powered up with an AC transformer, the battery cutoff
relay is pulled in automatically. For more information refer to Figure 1.
6.4 Battery Replacement Period
DMP recommends replacing the battery every 3 to 5 years under normal use.
AC
1234
+BAC –B
Battery
Start
318 Battery
Harness
Panel Red and
Black Battery Cables
Red
Black
Battery
Battery
Battery
318 Battery
Harness
Red
Black
56
BELL GND
To AC
14 AWG to
Earth Ground
XR550
Panel
PTC
PTC
To Bell
Circuit
Figure 6: Wiring Multiple Batteries
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