Battery Discharge And Recharge Schedule; B520 Aux Power Supply - Bosch B9512G-E Installation Manual

Control Panels
Load shed
Load shed relay 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 relay disconnects the battery from the control panel and disables control panel. Load
shed protects the battery from being damaged by deep discharge.
When AC power restores, the load shed relay reconnects the charging circuit on control panel
to the battery and the battery begins to recharge.
Over load with AC present
If devices draw more than 1.6 A of auxiliary current from the control panel with AC applied,
the control panel indicates a Panel Over-current system trouble. Unless corrected, this
condition prevents the control panel from properly maintaining the battery charge level, and
leaves the system vulnerable to failing during power outages.
To correct the issue, remove all loads to the control panel and disconnect the battery and AC
power. Fix the condition creating the over current and reconnect AC power.
A shorted battery condition (created either by a shorted cell inside the battery or by a short
on Terminals 4 and 5), might prevent the control panel from operating, or might cause the
control panel to detect a missing battery condition.
Caution!
Shorting the battery terminals is dangerous.
!
6.1.6

Battery discharge and recharge schedule

Battery Discharge
discharge/ Cycle
recharge
schedule
Recharge
Cycle
6.2

B520 aux power supply

The optional B520 provides up to 2 A of 12 VDC standby power for Fire and Burglar
applications. For Burglar applications, an additional 2 A of alarm power is available, allowing 2
A of standby current and up to 4 A of alarm current.
The control panels support the following number of B520 modules:
–
–
The power supply draws approximately 15 mA (+/- 1 mA) from the control panel.
For detailed instructions, refer to the corresponding document listed in Related
documentation, page 13.
Bosch Security Systems, Inc.
13.30 VDC
12.1 VDC
10.2 VDC
10.2 VDC
AC ON
12.50 VDC (under
load)
13.4 VDC and charging
current < 200 mA
B9512G. 8
B8512G. 4
BATTERY STATUS LED slow flash.
Low Battery Report, if programmed.
BATTERY STATUS LED quick flash.
Minimum operational voltage.
Battery load shed.
Load shed relay resets, battery charging begins.
Battery Restoral Report sent, BATTERY STATUS LED
off.
Battery float charged. BATTERY STATUS LED off.
Installation Manual
Power supply | en 39
2018.07 | 10 | F.01U.303.996