D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 16.0 Specifications
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Bosch Security Systems, Inc. | 7/16 | F01U265457-09 85
16.2 B520 Power Supply
Table 32: B520 Specifications
Voltage Input
(Power
Supply)
Primary: 18 VAC 18.0 VAC 50 VA class 2 plug-in transformer (TR1850)
Secondary: Batt 1, Batt 2
terminals
The B520 Auxiliary Power Supply Module supports the connection of two
independently monitored sealed lead-acid rechargeable batteries (12.0
VDC, 7 Ah through 12.0 VDC, 36 Ah).
Current
Requirements
Refer to the B520 Auxiliary Power Supply Module Battery Standby Chart section in the B520 Auxiliary Power
Supply Module Installation and Operation Guide (P/N: F01U265445) for the current draw requirements of
other system components.
Power
Outputs
*
All external connections are power-limited except battery terminals.
Continuous
Power
Outputs
SDI2 Out,
AUX PWR
terminals
2.0 A maximum at 12.0 VDC nominal (continuous supply) total for all
devices and outputs supplied.
Fire and
Fire/Burglary
Systems
To comply with UL 985 and 864 listing standards for fire alarm systems, the total
combined continuous and alarm current draw for the system during alarm conditions must
be limited to 2.0A provided by the primary power supply (rectified AC). If current draw for
the system exceeds 2.0 A, remove connected devices until the current draw falls below 2.0
A. Then, connect the removed devices to an additional B520 Auxiliary Power Supply
Module or to an external power supply.
*For UL 864 applications, refer to the Compatible Accessories section for compatible devices.
Minimum
Operating
Voltage
10.2 VDC
SDI2 Bus
SDI2 Bus A: 8 VDC – 2000 ft (610 m) maximum
SDI2 Bus B: 8 VDC – 2000 ft (610 m) maximum
Battery
Discharge/
Recharge
Schedule
Discharge
Cycle
13.2 VDC Charging float level.
12.0 VDC Low Battery and AC Fail Reports if programmed. Low Battery LED on.
10.2 VDC Minimum operational voltage
9.8 VDC Battery load shed (operation continue if AC is present).
Recharge
Cycle
AC ON
Load shed relay resets, battery charging begins, Battery Trouble and AC
Restoral Reports sent.
12.6 VDC Battery Restoral Report sent, Low Battery LED off.
Environmental
Temperature:
+32°F to +120°F (0°C to +49°C)
Relative
Humidity:
Maximum 93% non-condensing
Compatible
Enclosures
D8103 Universal Enclosure, D8004 Transformer Enclosure, B10 Medium Control Panel Enclosure, D2203
Standard Enclosure, BATB-40 Enclosure, BATB-80 Enclosure, AE1 and AE2 Enclosures.
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