Bosch Appliances 3.5 manual Power Consumption, 33.1Introduction, 33.2Power consumption

Praesideo 3.5 Installation and User Instructions 7 System Hardware Installation

en 304

33 Power Consumption

33.1Introduction

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.

33.2Power consumption

See table 33.1 for a list of all power sinks in the Praesideo system.

table 33.1: Power consumption

Type no.	Description	Watt
LBB4402/00	Audio Expander	9.0
LBB4404/00	CobraNet Interface	11
PRS-NSP	Network Splitter	3.9
PRS-FIN(S)	Fiber Interface	4.6
PRS-FINNA
PRS-1P500	Power Amplifier 1 x 500 W	0.0*
PRS-2P250	Power Amplifier 2 x 250 W	0.0*
PRS-4P125	Power Amplifier 4 x 125 W	0.0*
LBB4428/00	Power Amplifier 8 x 60 W	0.0*
PRS-1B500	Basic Amplifier 1 x 500 W	0.0*
PRS-2B250	Basic Amplifier 2 x 250 W	0.0*
PRS-4B125	Basic Amplifier 4 x 125 W	0.0*
PRS-8B060	Basic Amplifier 8 x 60 W	0.0*
PRS-16MCI	Multi Channel Interface	0.0*/
		12
LBB4430/00	Call Station Basic	4.4
LBB4432/00	Call Station Keypad	1.3
PRS-CSNKP	Numeric Keypad	1.6
LBB4433/00	Call Station Kit	6.2
LBB4434/00	Call Station Keypad Kit	1.2
PRS-CSI	Call Station Interface	3.7
PRS-CSR	Remote Call Station	2.9
PRS-CSRK	Remote Call Station Kit	4.0
PRS-CRF	Call Stacker	4.2

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.

33.3Battery capacity calculation

An essential part of an emergency sound system is the backup power source. For compliancy with EN54-16, it is required that the power source complies with EN54-4. Often a battery pack with a charger is used as backup power source. To calculate the required battery capacity, an MS Excel sheet is provided on the distribution DVD in the Tools folder, the Praesideo Power Requirement Calculator. The accompanying application note describes how to use this program.

If the Praesideo Power Requirement Calculator is not used for battery capacity calculation, take the following into consideration:

•In case the mains power fails, the battery capacity should be sufficient to address all zones in case of an emergency.

•BGM should be stopped while the system is in the emergency state and/or is running on batteries, so the batteries are not loaded unnecessarily.

•The current consumption of the amplifiers is the main load for the batteries. Most standards require that the battery capacity is sufficient for 24 hours of idle use (no calls, no BGM), followed by emergency announcements or tones for 30 minutes to all zones. The power consumption of the amplifiers depends on the level of the output signal and the connected load. Because the amplifiers are Class D amplifiers

Bosch Security Systems 2011-02