Power Consumption; Introduction; Battery Capacity Calculation - Bosch Praesideo 3.5 Installation And User Instructions Manual

Praesideo 3.5 | Installation and User Instructions | 7 | System Hardware Installation
33

Power Consumption

33. 1

Introduction

To calculate the power consumption and power budget
in an easy way, the power consumption or power supply
of each unit is defined in Watt. A power load uses an
amount of Watt, whereas a power source provides a
number of Watts.
As long as the total number of Watt required by the
power loads in the system are equal or less than the total
amount of Watt provided by the power sources,
normally no external power supplies are needed to feed
additional power to the system.
33.2 Power consumption
See table 33.1 for a list of all power sinks in the
Praesideo system.
table 33. 1 : Power consumption
Type no. Description
LBB4402/00 Audio Expander
LBB4404/00 CobraNet Interface
PRS-NSP Network Splitter
PRS-FIN(S) Fiber Interface
PRS-FINNA
PRS-1P500 Power Amplifier 1 x 500 W
PRS-2P250 Power Amplifier 2 x 250 W
PRS-4P125 Power Amplifier 4 x 125 W
LBB4428/00 Power Amplifier 8 x 60 W
PRS-1B500 Basic Amplifier 1 x 500 W
PRS-2B250 Basic Amplifier 2 x 250 W
PRS-4B125 Basic Amplifier 4 x 125 W
PRS-8B060 Basic Amplifier 8 x 60 W
PRS-16MCI Multi Channel Interface
LBB4430/00 Call Station Basic
LBB4432/00 Call Station Keypad
PRS-CSNKP Numeric Keypad
LBB4433/00 Call Station Kit
LBB4434/00 Call Station Keypad Kit
PRS-CSI Call Station Interface
PRS-CSR Remote Call Station
PRS-CSRK Remote Call Station Kit
PRS-CRF Call Stacker
Bosch Security Systems | 2011-02
Note
All items with an * do not consume power
supplied by the Praesideo system.
Note
The power for the multi channel interface can be
supplied by a connected basic amplifier or by
the system. Refer to 9.3.3.
If the multi channel interface receives power
from a connected basic amplifier, the power
load on the Praesideo system is 0 W.
If the multi channel interface receives power
from the Praesideo system, the power load is
12 W. Refer to table 33. 1 .

33.3 Battery capacity calculation

An essential part of an emergency sound system is the
Watt
backup power source. For compliancy with EN54-16, it
9.0
is required that the power source complies with EN54-4.
11
Often a battery pack with a charger is used as backup
3.9
power source. To calculate the required battery
4.6
capacity, an MS Excel sheet is provided on the
distribution DVD in the Tools folder, the Praesideo
0.0*
Power Requirement Calculator. The accompanying
0.0*
application note describes how to use this program.
0.0*
0.0*
If the Praesideo Power Requirement Calculator is not
0.0*
used for battery capacity calculation, take the following
0.0*
into consideration:
0.0*
• In case the mains power fails, the battery capacity
0.0*
should be sufficient to address all zones in case of an
0.0*/
emergency.
12
• BGM should be stopped while the system is in the
4.4
emergency state and/or is running on batteries, so
1.3
the batteries are not loaded unnecessarily.
1.6
• The current consumption of the amplifiers is the
6.2
main load for the batteries. Most standards require
1.2
that the battery capacity is sufficient for 24 hours of
3.7
idle use (no calls, no BGM), followed by emergency
2.9
announcements or tones for 30 minutes to all zones.
4.0
The power consumption of the amplifiers depends
4.2
on the level of the output signal and the connected
load. Because the amplifiers are Class D amplifiers
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