D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 5.0 Power Supply
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Bosch Security Systems, Inc. | 7/16 | F01U265457-09 31
B520 Specifications
Operating Voltage 11.5 – 12.2 VDC
Current available
(maximum)
2.0 A SDI2 Out and
AUX power
(combined) (up to 4.0
A of alarm current for
Burglar Applications)
AC line input voltage
frequency
120 VAC +10/-15% (60
Hz) 0.5 A
Current drawn from the
control panel
15 mA
Battery input 2 separate 12 V lead
acid batteries (7-18
Ah) 4.0 A max
available from charger
Transformer power
supply
TR1850 – (18 VAC, 50
VA)
TR1850-CA – (18 VAC,
50 VA) for Canada
Dimensions (H x W x D) 4.5 in x 6.94 in x 1.15
in (11.43 cm x 17.62
cm x 2.9 cm)
5.2.4 Battery Supervision
When battery voltage drops to 13.8 VDC, the
yellow Charging Status LED illuminates. When the
battery voltage drops to 12.0 VDC to 11.8 VDC,
the red Low Battery LED lights, and the keypad
or keypads display SERVC LOW BATT on the
keypad display. The control panel (if programmed
for power supervision) sends a BATTERY LOW
report in the Modem4 communication format. It
sends a Low System Battery (302) report in the
Contact ID format.
If the battery is missing or shorted, the red Low
Battery LED flashes at the same rate as the green
Operation Monitor LED. If the control panel is
programmed for power supervision, it sends a
BATTERY MISSING report in the Modem4
communication format, or Control Panel Battery
Missing (311) report in the Contact ID format.
When battery voltage returns to 13.7 VDC, the
Low Battery LED turns off and the keypad or
keypads clear the SERVC LOW BATT message on
the keypad display. If the control panel is
programmed for power supervision, it sends a
BATTERY RESTORAL report in the Modem4
communication format or a Control Panel Battery
Restored to Normal (302) report in the Contact
ID format. At 13.9 VDC, the yellow Charging
Status LED stops lighting.
Figure 8: Charging and Battery LEDs
Investigate Low Battery reports immediately: If
primary (AC) power is off and the discharge
continues, the control panel becomes inoperative
when the battery voltage drops below 10.2 VDC.
5.2.5 Battery Charging Circuit Float Charge
The float voltage for the battery charging circuit
is 13.9 VDC at a maximum current of 1.4 A, less
any devices connected to the control panel. If the
float voltage drops below 13.8 VDC due to
overload or battery discharge, the yellow
Charging Status LED lights.
Loss of AC Load Shed Output protects battery:
During an AC power loss, the battery supplies all
power to the security system. If the battery
voltage falls below 10.0 V during an AC power
loss, a load shed output isolates the battery from
the control panel and disables the control panel.
Load shed protects the battery from being
damaged by deep discharge.
LEDs Off When Normal
YELLOW - Charging Status
RED - Low Battery - 12.1 VDC
10.2 VDC - Battery Load Shed
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