Bosch B9512G User manual

Control panels
B9512G/B8512G (B9512G‑E/B8512G‑E)
en UL Installation manual

Control panels Introduction | en 3
Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
1 Introduction
This section includes an introduction to documents for this product and other document-
related instructions.
1.1 About documentation
This document has instructions for a trained installer to install, configure, and operate this
control panel, and optional peripheral devices.
(Bosch Security Systems, Inc. recommends that installers follow good wiring practices such as
those described in NFPA 731, Standard for the Installation of Electronics Premises Security
Systems.)
Throughout this document, the words “control panel” refer to all control panels covered by
this document (B9512G/B8512G/B9512G-E/B8512G-E).
Notifications
This document uses Notices, Cautions, and Warnings to draw your attention to important
information.
Notice!
These include important notes for successful operation and programming of equipment, or
indicate a risk of damage to the equipment or environment.
!
Caution!
These indicate a hazardous situation which, if not avoided, could result in minor or moderate
injury.
!
Warning!
These indicate a hazardous situation which, if not avoided, could result in death or serious
injury.
Copyright
This document is the intellectual property of Bosch Security Systems, Inc. and is protected by
copyright. All rights reserved.
Trademarks
All hardware and software product names used in this document are likely to be registered
trademarks and must be treated accordingly.
1.1.1 Related documentation
Control panel documents
Control Panels (B9512G/B8512G) Release Notes*
Control Panels (B9512G/B8512G) Installation Manual+
Control Panels (B9512G/B8512G/B6512/B5512/B4512/B3512) Operation Manual* +
Control Panels (B9512G/B8512G) Program Entry Guide+
Control Panels (B9512G/B8512G) UL Installation Manual* +
Control Panels (B9512G/B8512G) SIA Quick Reference Guide* +

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
Control Panels (B9512G/B8512G/B6512/B5512/B4512/B3512) ULC Installation Manual
*Shipped with the control panel.
+Located on the documentation CD shipped with the control panel.
Keypad documents
Basic Keypad (B915) Installation Guide*
Two-line Alphanumeric Keypad (B920) Installation Guide*
Fire Keypads (B925F/B926F) Installation Guide*
Two-line Capacitive Keypad with Inputs (B921C) Installation Guide*
ATM Style Alphanumeric Keypad (B930) Installation Guide*
B940W Touch screen KP, White Quick installation guide*
Touch Screen Keypad (B942/B942W) Installation Guide*
*Shipped with the keypad.
Optional module documents
Octo-input Module (B208) Installation and Operation Guide*
POPEX Module (B299) Installation Guide*
Octo-output Module (B308) Installation and Operation Guide*
Conettix Ethernet Communication Module (B426) Installation and Operation Guide* +
Plug-in Telephone Communicator (B430) Installation Guide Installation Guide*
Conettix Plug-in GPRS Cellular Communicator (B442) Installation and Operation Guide*
Conettix Plug-in HSPA+ Cellular Communicator (B443) Installation and Operation Guide*
Conettix Cellular Communicators B44x Installation Manual
Conettix Plug-in cellular module VZW LTE B444/B444-C Installation Manual*
B444‑A | B444‑V Quick installation guide*
Conettix Plug-in Communicator Interface (B450) Installation and Operation Guide* +
Auxiliary Power Supply (B520) Installation and Operation Guide*
Retrofit ZONEX Module (B600) Installation Guide
RADION receiver SD (B810) Installation Guide*
SDI2 Inovonics Interface Module (B820) Installation Guide*
Access Control Module (B901) Installation Guide
Dual Class B Initiating Module (D125B) Installation Instructions
Multiplex Bus Interface (D8125MUX) Operation and Installation Guide
OctoPOPIT Module (D8128D) Installation Guide
Access Control Interface Module (D9210C) Installation and Operation Guide
*Shipped with the module.

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
+Located on the documentation CD shipped with the module.
1.2 Bosch Security Systems, Inc. product manufacturing dates
Use the serial number located on the product label and refer to the Bosch Security Systems,
Inc. website at http://www.boschsecurity.com/datecodes/.

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
2 System overview
This section has the following information:
–Parts list, page 6
–Control panel capacities, page 6
– Accessories
– Features
2.1 Parts list
Control panels ship assembled from the factory with the following parts:
Literature
–Control Panels (B9512G/B8512G) UL Installation Manual
–Control Panels (B9512G/B8512G/B5512/B4512/B3512) Operation Manual
–Control Panels (B9512G/B8512G) SIA Quick Reference Guide
–Control Panels (B9512G/B8512G) Documentation CD
–Product Label in French
–7000/9000 Series Point Chart Label
HW pack
– 1 kΩ EOL resistors
– Battery wires
Assembly
– PC board with protective cover
– Mounting skirt
– One #6 x 3/4-inch screw
2.2 Control panel capacities
Features B9512G/
B9512G-E
B8512G/
B8512G-E
Number of users 2000 500
Total number of doors 32181
Number of cards/tokens 2000 500
Number of custom functions 32 8
Number of areas 32 8
Number of points 599 99
Number of outputs 599 99
Total number of keypads 322162
Number of octo-intput modules (B208) 59 9
Number of POPEX modules (B299) 6 1
Number of octo-output modules (B308) 59 9
Number of on-board Ethernet ports (“E” control panel variants do not include an
Ethernet port)
1 1
Number of B426 or B450 modules 2 2
Number of plug-in telephone communication modules (B430) 2 2

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
Features B9512G/
B9512G-E
B8512G/
B8512G-E
Number of plug-in cellular modules (B440/B441/B442/B443/B444/B444-A/B444-V) 1 1
Number of auxiliary power supply modules (B520) 8 4
Number of wireless receivers (B810/B820) 1 1
Number of cameras316 8
1The control panel supports 32 doors using the optional B901 Access Control Module. The control panel
supports up to 8 doors using the optional D9210C Access Control Interface Module.
2The control panel supports up to 16 of the keypads as SDI keypads.
3Bosch IP cameras use is supplementary in UL Listed systems.

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
3 Control panel installation
Refer to Enclosures to determine if the application requires a specific enclosure.
Enclosure and control panel (back view) overview
Callout ᅳ Description Callout ᅳ Description
1 ᅳ Hooks to attach the mounting skirt (2) 5 ᅳ Enclosure mounting holes (5)
2 ᅳ Three-hole pattern for mounting modules (4) 6 ᅳ Holes to attach the mounting skirt to hooks (2)
3 ᅳ Mounting location for the tamper switch 7 ᅳ Tab to secure the mounting skirt
4 ᅳ Mounting skirt screw location
3.1 Installing the enclosure
Notice!
Electromagnetic interference (EMI)
EMI can cause problems on long wire runs.
1. Remove the knockouts.
2. Mount the enclosure. Use all enclosure mounting holes. Refer to the mounting
instructions supplied with the selected enclosure.
3. Pull the wires into the enclosure through the knockouts.
4. Position the supplied point label chart on the inside of the enclosure door (optional).
3.2 Installing the control panel
1. Position the control panel over the inside back of the enclosure.
2. Align the Holes to attach the mounting skirt to hooks with the hooks.
3. Slide the control panel down so that it hangs on the hooks.
4. Secure the mounting skirt screw.

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
3.2.1 Earth ground
To help prevent damage from electrostatic discharges or other transient electrical surges,
connect the system to earth ground before making other connections. The earth ground icon
identifies the earth ground terminal. Recommended earth ground references are a grounding
rod or a cold water pipe. Make the connection using 14 AWG (1.8 mm) to 16 AWG (1.5 mm)
wire.
To help prevent damage from electrostatic discharges or other transient electrical surges,
connect the system to earth ground before making other connections. The icon shows the
earth ground terminal. Use a recommended earth ground reference, such as a grounding rod
or a cold water pipe. Make the connection using 14 AWG (1.8 mm) to 16 AWG (1.5 mm) wire.
Notice!
Do not use telephone or electrical ground
Do not use telephone or electrical ground for the earth ground connection. Do not connect
other control panel terminals to earth ground.
!
Caution!
Avoid electrostatic discharge
Always touch the earth ground connection with the icon first, before beginning work on the
control panel.
3.2.2 Ground Fault Detect enable
To meet UL 864 requirements, enable Ground Fault Detect.
A ground fault is a circuit impedance to ground sufficient to result in the annunciation of a
trouble condition.
The control panel has a ground fault detection circuit that when enabled, detects ground
faults on Terminals 1 to 9 and 11 to 30.
If a ground fault condition occurs, the keypads annunciate a ground fault and control panel
transmits a trouble message.
When the control panel recognizes that the ground fault condition is corrected, and remains
corrected for between 5 to 45 consecutive seconds, the control panel clears the fault from the
keypad display and sends a restoral report.
The control panel detects ground fault at ≤ 300 Ω.
Enabling Ground Fault Detect and reports
4In RPS or in the Installer Services Portal programming tool (available in Europe, Middle
East, Africa, and China), set the following parameters:
– PANEL WIDE PARAMETERS > Miscellaneous > Ground Fault Detection. Set to Enable.
– PANEL WIDE PARAMETERS > Report Routing > Burglar Reports > Trouble Report. Set to
Yes.
– PANEL WIDE PARAMETERS > Report Routing > Burglar Reports > Burg Restore (After
Trouble). Set to Yes.
3.2.3 Ground fault detection troubleshooting
The control panel requires -2.1 V decay to 0.
Measuring and comparing voltage for ground fault detection
1. Set your digital voltmeter (DVM) to measure VDC.
2. Connect the red DVM lead to control panel Terminal 10, and the black DVM lead to
Terminal 9.
3. Compare this voltage to the following table.

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
Control panel voltage at Terminals 9 and 10) Terminal potentially causing ground fault
~ 0 VDC 4, 9, 12, 15, 17, 21
~ 13.65 VDC 5, 6, 7, 8, 26, 30
~ 2.51 VDC 11, 13, 14, 16, 17, 19, 20, 22
~ 2.44 to 3.2 VDC 24
~ 10.9 to 11.2 VDC 25
~ 7.2 VDC 28
~ 5.8VDC 29
~ 7.35 VDC 1, 2
3.3 Control panel to module wiring overview
You can use interconnect or terminal wiring to connect devices to the control panel.
If SDIx is configured for SDI2, use either SDI2 bus.
Using terminal wiring in parallel
Notice!
Wire size
For terminal wiring, use 18 AWG to 22 AWG (1.0 mm to 0.6 mm) wire.

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
RESETZONEX TAMPER
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
24
25
26
27
28
29
23
26
SDIx
ire
olice
ting
RESETZONEX TAMPER
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
25
26
28
29
30
23
27
SDIx
ire
olice
ting
24
ZONEX TMPR
SDIx SDI2
MODULE RELEASE
MOD-2
MOD-1
Using interconnect wiring
Notice!
More information
For more information on interconnect wiring, refer to SDI2 interconnect wiring.

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
SDI2 devices daisy chained with interconnect wiring
RESETZONEX TAMPER
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
24
25
26
27
28
29
23
26
SDIx
ire
olice
ting
RESETZONEX TAMPER
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
25
26
28
29
30
23
27
SDIx
ire
olice
ting
24
ZONEX TMPR
SDIx SDI2
MODULE RELEASE
MOD-2
MOD-1

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
4 Power supply
This section provides information on installing and maintaining primary power, batteries, and
auxiliary power.
4.1 Secondary (DC) power
4 5
A 12 V sealed lead-acid rechargeable battery (such as the D126/D1218) supplies secondary
power to maintain system operation during interruptions of primary (AC) power.
Notice!
Use sealed lead acid batteries only
The charging circuit is calibrated for lead-acid batteries. Do not use gel-cell or NiCad
batteries.
Extra batteries
To increase battery back-up time, connect a second 12 V battery in parallel to the first battery.
Use a D122/D122L Dual Battery Harness to ensure proper and safe connection.
Refer to Standby battery requirements and calculations.
D1218 Battery
The D1218 is a 12 V, 18 Ah battery for use in applications requiring extended battery standby
time. The control panel does not support more than 38 Ah of battery.
4.1.1 Install the battery
1. Put the battery upright in the base of the enclosure.
2. Locate the red and black leads supplied in the hardware pack.
3. Connect the black battery lead to 4 .
4. Connect the other end to the negative (-) side of the battery.
5. Connect the red battery lead to 5.
6. Connect the other end to the positive (+) side of the battery.
!
Warning!
High current arcs are possible
The positive (red) battery lead and the terminal labeled 5 can create high current arcs if
shorted to other terminals or the enclosure. Use caution when you touch the positive lead
and the terminal labeled 5. Always disconnect the positive (red) lead from the battery before
you remove it from the terminal labeled 5.
!
Caution!
Battery terminals and wire are not power limited
Maintain a 0.250 in (6.4 mm) space between the battery terminals, battery wiring, and all
other wiring. Battery wiring cannot share the same conduit, conduit fittings, or conduit
knockouts with other wiring.

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Non-power-limited wiring
USB POWER
STATUS L
I
N
K
ETHERNETUSB
B
A
S
E
T
11 13 14 16 17 19 20 22
12 15 18 21
Quick Flash: Low
BATTERY STATUS
Slow Flash:
Charging
Off: Normal
On: Missing
Low 12.1 VDC
Load Shed 10.2 VDC
EARTH GROUND
COMMON
BATTERY ( - )
+ AUX POWER
BATTERY ( + )
CLASS 2
16.5 VAC 40 VA 60 Hz
TRANSFORMER
10
9
8
7
6
5
4
3
2
1
OUTPUT
B (2)
OUTPUT
A (1)
OUTPUT
C (3)
Do not connect
to a receptacle
controlled by
a switch.
Point 5 Point 6
Point 3 Point 4
Point 1 Point 2 Point 7 Point 8
ON-BOARD POINTS
1 k End-of-line-Resistors Required (P/N 15093130-004),
WARNING!
Multi-Battery
installation requires
Model D122 or D122L
Dual Battery Harness.
Improper installation
can be a fire hazard .
WARNING!
Incorrect wiring will
damage this
equipment.
Devices powered by
any output must be
supervised.
POWER SUPPL
The Power S
refer to the B
The system is intended
panel has been approv
RevPol.
Battery: Replace every 3 to
5 years with one or two
Model D126 or D1218 12V
Lead Acid Batteries.
WARNING!
To prevent risk of shock,
disconnect AC power and
communication lines before
servicing.
All exte
Require
Voltage Ranges: Open 3.7 - 5.0 VDC,
Owner I
be removed by
POINT 1 COM POINT 2 POINT 3 COM POINT 4 POINT 5 COM POINT 6 POINT 7 COM POINT 8
12
3
4
5
6
Callout ᅳ Description
1 ᅳ Conduit required for use with external batteries
2 ᅳ Battery wires
3 ᅳ 0.25 in (6.4 mm) minimum. To ensure proper spacing, use tie-wraps or similar devices to
secure wires.
4 ᅳ Output wires
5 ᅳ Sensor loop wires
6 ᅳ 12 V sealed lead-acid rechargeable battery (D126/D1218)
Charging the battery
1. Connect the battery
2. Connect the transformer.
3. Allow the control panel to charge the battery while you complete the installation.
4.1.2 BATTERY STATUS LED
The control panel includes one BATTERY STATUS LED with 4 LED patterns to indicate the
battery status.

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LED pattern Function Refer to
Off
Battery is fully charged. N/A
Flashing slowly
Battery charge is below 13.4
VDC and the battery is
recharging.
Low battery, page 15 and
Battery restoral, page 15
Flashing quickly
Battery voltage dropped to
between 12.1 VDC and 10.2
VDC.
LED turns off when voltage
reaches at least 13.4 and > 200
mA.
Low battery, page 15 and
Battery restoral, page 15
On Steady
Battery is missing, shorted, or
reversed.
Missing battery, page 15
4.1.3 Battery maintenance
Use 12 VDC sealed lead-acid rechargeable battery (7 Ah, 18 Ah, or 38 Ah). The control panel
supports up to 38 Ah of battery. If you use two batteries, they must have the same capacity,
and you use a D22/D122L to connect them.
Replace the batteries every 3 to 5 years. If you install two batteries, replace them both at the
same time.
Record the date of installation directly on the battery.
!
Caution!
Heavy discharges possible
The system can have heavy discharges if you exceed the maximum output ratings or install
the transformer in an outlet that is routinely switched off. Routine heavy discharges can lead
to premature battery failure.
4.1.4 Battery supervision
Low battery
If the control panel is programmed for power supervision, it sends a Battery Low report in the
Conettix Modem4 format or a Low System Battery (302) report in the Conettix ANSI-SIA
Contact ID format.
Missing battery
If the control panel is programmed for power supervision, it sends a Battery Missing/Dead
report in the Conettix Modem4 format, or a Control Panel Battery Missing (311) report in the
Conettix ANSI-SIA Contact ID format.
Battery restoral
When AC returns and the battery is charged, If the control panel is programmed for power
supervision, it sends a Low System Battery Restore report in the Conettix Modem4 format or a
Control Panel Battery Restored to Normal (302) report in the Conettix ANSI-SIA Contact ID
format.

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4.1.5 Battery charging circuit float charge
The float voltage for the battery charging circuit is 13.65 VDC when operating within load
range.
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.
4.1.6 Battery discharge and recharge schedule
Battery
discharge/
recharge
schedule
Discharge
Cycle
13.30 VDC
12.1 VDC
10.2 VDC
10.2 VDC
BATTERY STATUS LED slow flash.
Low Battery Report, if programmed.
BATTERY STATUS LED quick flash.
Minimum operational voltage.
Battery load shed.
Recharge
Cycle
AC ON
12.50 VDC (under
load)
13.4 VDC and charging
current < 200 mA
Load shed relay resets, battery charging begins.
Battery Restoral Report sent, BATTERY STATUS LED
off.
Battery float charged. BATTERY STATUS LED off.
4.2 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:
– B9512G. 8
– B8512G. 4
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 3.

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4.2.1 SDI2 address settings
Notice!
The module reads the address switch setting only during module power up. If you change the
setting after you apply power to the module, you must cycle the power to the module in order
for the new setting to take effect.
If multiple B520 modules reside on the same system, each B520 module must have a unique
address.
4.2.2 Supervision
The control panel supervises any B520 on the SDI2 bus.
With any failure to receive an expected response from a B520, all keypads show a system
fault. The control panel sends a module trouble report to the central station (if configured for
module trouble reports).
4.2.3 Auxiliary power supply trouble conditions
Each auxiliary power supply module on the SDI2 bus monitors several conditions including AC
status, battery status, over current status, and a tamper input. Each of these conditions
produces a unique system trouble condition at all keypads. The control panel sends a module
trouble report to the central station (if configured for module trouble reports).
4.2.4 Installation and control panel wiring (B520)
Calculate power consumption
Make sure that there is enough power for the module and the other powered devices that you
want to connect to the system.
Refer to On-board outputs, page 21.
!
Caution!
Remove all power (AC and battery) before making any connections. Failure to do so might
result in personal injury and/or equipment damage.
Installing the module
1. Set the module address.
2. Insert the plastic mounting clips onto the standoff locations inside the enclosure or on a
mounting skirt, when required.
3. Mount the module onto the plastic mounting clips.
4. Tighten the supplied mounting screws.
Wiring to earth ground
4To help prevent damage from electrostatic charges or other transient electrical surges,
connect the system to earth ground before making other connections.
Notice!
Earth ground reference
Do not use telephone or electrical ground for the earth ground connection. Use 14 AWG (1.8
mm) to 16 AWG (1.5 mm) wire when making the connection
Use a grounding rod or a cold water pipe.
Run wire as close as possible to grounding device.

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
Callout ᅳ Description
1 ᅳ B520 Auxiliary Power Supply Module
2 ᅳ 14 AWG - 16 AWG (1.8 mm - 1.5 mm) wire
3 ᅳ Ground device (grounding rod or cold water pipe)
Wiring to the control panel
Notice!
Terminal wiring
Use the terminal strip labeled with PWR, A, B, and COM for SDI2 IN to wire to corresponding
control panel SDI2 terminals. Do not use interconnect wiring.
Use 12 AWG to 22 AWG (2.0 mm to 0.6 mm) wire.
SDI2 OUT SDI2 IN
PWR A B COMPWR A B COM
1
2
3
R
Y
G
B
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
24
25
26
27
28
29
23
26
SDIx
ire
olice
ting
SDI2
PWR+/R
A/Y
B/G
COM/B
PWR+/R
A/Y
B/G
COM/B
25
26
28
29
30
23
27
SDIx
ire
olice
ting
24
SDIx SDI2
MODULE RELEASE
MOD-2
MOD-1
Callout ᅳ Description
1 ᅳ Control panel
2 ᅳ B520 Auxiliary Power Supply Module
3 ᅳ Terminal strip wiring
4.2.5 Powered device and battery wiring
When you wire the output of a B520 to a SDI2 module, the B520 provides power to the
module while passing through data between the control panel and the module.

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Bosch Security Systems B.V. UL Installation manual 2019-12 | 06 | F.01U.304.001
Wiring SDI2 modules
PWR A B COM
2
4
PWR A B COM
SDI2 OUT SDI2 IN
PWR A B COMPWR A B COM
1
2
3
SDI2 OUT SDI2 IN
PWR A B COMPWR A B COM
1
R Y G B
Callout ᅳ Description
1 ᅳ B520 Auxiliary Power Supply Module
2 ᅳ Powered device (SDI2 module)
3 ᅳ Terminal strip wiring
4 ᅳ Interconnect wiring (P/N: F01U079745)
1. Do one of the following:
Use terminal wiring to connect the SDI2 OUT terminal strip labeled with PWR, A, B, and
COM on the B520 to the terminals labeled PWR, A, B, and COM on the first module.
Connect an interconnect wiring cable (included) to the SDI2 OUT interconnect connector
on the B520 to the interconnect connector on the first module.
2. Connect additional modules in series with the first module.
Wiring to batteries
Notice!
Battery wiring requirements
You must wire BATT 1. You must wire BATT 2 if you configure the B520 for two batteries.
When you use BATT 2, both batteries must have the same rating.
Maximum standby power cannot exceed 36 Ah.
BATT 1 BATT 2
RBR B
+ -
1
23
+ -
Callout ᅳ Description

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2019-12 | 06 | F.01U.304.001 UL Installation manual Bosch Security Systems B.V.
1 ᅳ B520 Auxiliary Power Supply Module
2 ᅳ Battery 2 (BATT 2) - (12 V nominal lead acid)
3 ᅳ Battery 1 (BATT 1) - (12 V nominal lead acid)