XR150FC/XR550FC Series Installation Guide
Digital Monitoring Products
7
Wire the Batteries
DMP recommends replacing batteries every 3 to 5 years under normal use. Connect the black battery lead to the
negative battery terminal. The negative terminal connects to the enclosure ground internally through the panel PCB.
Connect the red battery lead to the battery positive terminal. You can add a second battery in parallel using the DMP
Model 318 Dual Battery Harness. Refer to Figure 5 for wiring information.
Note:
DMP requires that wiring in a battery harness is separated by a PTC to protect batteries from a reversal or
short within the circuit.
For listed installations, batteries can be installed in a DMP Model 341, 349, 350 or 352S enclosure and all wiring shall
run through conduit. The enclosure shall be installed to the left of the panel enclosure to ensure Battery and AC wire
separation.
Caution:
Use sealed lead‑acid batteries only. Batteries supplied by DMP have been tested to ensure proper charging
with DMP products. Do not use gel cell batteries.
Earth Ground (GND)
To provide proper transient suppression, panel Terminal 4 (battery negative) must be connected to an earth ground
using wire 14‑gauge or larger.
DMP recommends connecting to a cold water pipe, ground rod, or building ground only. Do not connect to an electrical
ground or conduit, sprinkler or gas pipes, or to a telephone company ground.
Battery Only Restart
When powering up the XR150FC/XR550FC
Series panel without AC power, briefly
short the battery start pads to pull in the
battery cutoff relay. Once the relay has been
pulled in, the battery voltage holds it in that
condition.
If the panel is powered up with an AC
transformer, the battery cutoff relay is pulled
in automatically. For more information refer
to Figure 1.
Discharge/Recharge
The XR150FC/XR550FC Series panel battery
charging circuit float charges at 13.9 VDC at a
maximum current of 1.0 Amps using a 56 VA
transformer. Battery voltage level conditions
are determined by the following voltage
ranges:
•
Battery Trouble
—Below 11.9 VDC
•
Battery Cutoff
—Below 10.2 VDC
•
Battery Restored
—Above 12.6 VDC
Battery Supervision
The panel tests the battery when AC power is present. The test is done every three minutes and lasts for five seconds.
During the test, the panel places a load on the battery. If the battery voltage falls below 11.9 VDC a low battery is
detected. If AC power is not present, a low battery is detected any time the battery voltage falls below 11.9 VDC. When
battery voltage drops below 10.2 VDC, the panel performs a battery cutoff to prevent deep discharge damage.
If a low battery is detected with AC power present, the test repeats every two minutes until the battery charges
above 12.6 VDC. If a weak battery is replaced with a fully charged battery, the restored battery will not be detected until
the next test is completed.
AC
1
2
3
4
+B
AC
–B
Battery
Start
Red
Black
Battery
Battery
Battery
318 Battery
Harness
Red
Black
5
6
BELLGND
To AC
XR550
Panel
PTC
PTC
To Bell
Circuit
To Earth
Ground
Figure 5: Wiring Multiple Batteries
