Securitron AQD3B User Manual
Page 6
Page 6
P/N 500-30000
Rev. A, 04/13
C. Install Batteries
1. Understanding Battery Charging and Backup Power
The AQD3B is a backup battery charger with automatic fail over to battery power in case of primary AC
power failure when batteries are installed and connected to the power module. The use of battery backup is
optional - the unit will function without batteries installed, but no internal backup power will be available in
case of AC power failure.
Note: The battery circuit features automatic disconnect when the battery output falls to 9.8 VDC/19.6 VDC
to prevent deep discharge and also protects the power module in case the battery is connection is reversed.
IMPORTANT: Battery configuration must match the DC output voltage setting.
For battery backup in 12VDC operation, a single 12V battery may be used, or two (2) 12V batteries may be
used wired in parallel for longer run time.
For battery backup in 24VDC operation, two 12V batteries wired in series must be used.
Backup power run time depends on the continuous output needed to support the load and the ambient
temperature at the enclosure. Estimates are provided in the table below:
Total Current
Draw of Load
Desired Battery Run Time with 5 min Alarm
1HR
4HR
12HR
1A
2AH
5AH
12AH
1.4A
3AH
8AH
20AH
2A
5AH
10AH
26AH
2.8A
5AH
12AH
40AH
Larger batteries may be used external to the enclosure by running the battery cable through a dedicated
knockout separate from the AC input and DC output.
Battery charge current is not less than 250mA @12VDC at peak load.
2. Connecting the Battery
Plug battery cable assembly into battery backup plug - BAT+.
IMPORTANT: DO NOT REMOVE CLEAR TUBING FROM BATTERY CABLE. THIS IS REQUIRED TO
PROVIDE REQUIRED SEPARATION FROM CLASS 2 POWER LIMITED WIRING.
Install batteries. Mark batteries with “Installed” date and “Replace By” date according to manufacturer’s
battery life recommendations.
Connect leads to batteries.
For 12VDC operation:
Connect red battery lead to the Positive (+) battery terminal.
Connect black battery lead to the Negative (-) battery terminal.
For 24VDC operation:
Using Battery Jumper Cable, connect the Positive (+) battery terminal
of one battery to the Negative (-) terminal of the second battery.
CAUTION: Connect and disconnect batteries with AC power ON. Battery circuit is engaged when AC power
is OFF. Adding or removing batteries with circuit engaged could result in electrical shock and injury.
Connect red battery lead to the
unused Positive (+) battery
terminal.
Connect black battery lead to
the unused Negative (-) battery
terminal.
Batteries
Jumper Cable