Installation Instructions

When battery voltage returns to 13.4 V, the keypads stop
showing the low battery messages. 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.
If programmed for power supervision, the control panel adds a
missing battery event to the event log. If programmed for
battery fault reports, the control panel sends a Battery Missing/
Dead report in the Modem4 communication format, or Control
Panel Battery Missing (311) report in the Contact ID format.
Battery discharge and recharge schedule
Discharge cycle
13.65 VDC - Charging float level.
12.1 VDC - Low Battery Report, if programmed.
10.2 VDC - Minimum operational voltage.
Recharge cycle
AC ON - Battery charging begins and AC Restoral Reports sent.
13.4 V - Battery Restoral Report sent. Battery float charged.
B520 Auxiliary Power Supply
The optional B520 Auxiliary Power Supply Module 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 B5512 control panels support up to 4 B520 modules. The
B4512/B3512 control panels support up to 2 B520 modules.
Connect B520 Auxiliary Power Supply Modules to the SDI2 bus
on the control panel using terminals PWR, A, B, and COM. This
section includes basic installation instructions. For detailed
installation instructions, refer to the Auxiliary Power Supply
Module (B520) Installation Guide for complete installation
4.2.4
4.3
22 en | Power supply Control Panels
2015.09 | 08 | F.01U.287.185 Bosch Security Systems, Inc.