Securitron AQU244B - Manual (Page 6)

Page 6 P/N 500-30040
Rev. A, 04/13
C. Install Batteries
1. Understanding Battery Charging and Backup Power
The AQU244B 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.
For battery backup in 24VDC operation, two (2) 12V batteries are wired in series are 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:
Estimated Standby Time (3 amp/5 minute reserve for alarm)
Total Output
Amps
4Ah Battery
Standby
7Ah Battery
Standby
12Ah Battery
Standby
24Ah
Standby
40Ah
Standby
2A 1 Hrs 2 Hrs 5 Hrs 10 Hrs 15 Hrs
3A .5 Hrs 1 Hrs 3 Hrs 6 Hrs 9.5 Hrs
4A .5 Hrs .8 Hrs 2 Hrs 4 Hrs 8 Hrs
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.
Charge current is not less than 1A @24VDC at peak load.
2. Connecting the Battery
Plug battery cable assembly into battery backup plug -
BAT+.
Install batteries. Mark batteries with “Installed” date
and “Replace By” date according to manufacturer’s
battery life recommendations.
Connect leads to batteries.
For 24VDC operation:
Using a 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.
Jumper Cable
Connect red battery lead to the unused
Positive (+) battery terminal.
Connect black battery lead to the unused
Negative (-) battery terminal.
Batteries