Digital Monitoring Products Inc PC0096 User Manual

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.  

 

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 

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.

DMP recommends replacing the battery every 3 to 5 years under normal use.

The panel battery charging circuit float 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

The panel tests the battery once every hour when AC power is present.  This test occurs 15 minutes past 

each hour and lasts for five 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.

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

1

2

3

4

+B

AC

–B

318 Battery 

Harness

Panel Red and 
Black Battery Cables

Red

Black

Battery

Battery

Red

Black

5

6

BELL GND

To AC

14 AWG to
Earth Ground

PTC

To Bell
Circuit