Bosch Appliances 3.5 manual 33.4Power sources, en, Bosch Security Systems

Praesideo 3.5 Installation and User Instructions 7 System Hardware Installation

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the power consumption scales with the output power in an almost linear way.

•The idle power consumption is specified in the amplifier section of the manual and should be divided by 48V to get the idle supply current for that amplifier, and then multiply by 24 hours to get the required battery capacity in Ah for that amplifier in idle state.

•For EN54-16 systems, the use of the amplifier power save mode is not permitted.

•During emergency calls often an alarm tone is broadcast. The maximum level of such a tone is -3dB, corresponding to half the rated output power. The -3dB power consumption of the amplifiers is also specified in the technical data section. Divide by 48V and multiply by 0.5 to get the required battery capacity in Ah for that amplifier for a maximum level alarm tone during 30 minutes. In case the amplifier is only partly loaded the battery capacity can be reduced accordingly. In case live speech or spoken messages are used instead of tones, the capacity can be halved again because the rms output level of speech is typically < -6dB for full output. In case an alarm tone has less than 100% duty cycle (i.e. contains a silence period) the capacity can be reduced accordingly. In case the output level is less than the maximum output level, again the capacity can be reduced accordingly.

•For spare amplifiers only the idle current consumption should be taken into account.

•The power consumption of all units that are powered by the network controller is given in section 33.2. Add up for all connected units, divide by 48V and multiply bij 24.5 hours to get the required battery capacity in Ah for these units.

•Take the sum of all calculated battery capacities and multiply by 1.25, as a margin to compensate for battery capacity loss due to aging of the batteries.

To reduce the risk of making errors, it is strongly recommended to use the Praesideo Power Requirement Calculator.

Note

If you create a redundant ring and you do not use additional power supplies, you can connect up to 55 Watt to the network controller. This is to ensure that when there is a fault in the network close to one of the system bus connectors of the network controller, the other system bus connector can still feed the entire network.

If more power is needed, external power supplies must be used to feed the system. The following units have a provision for connecting external power supplies:

•PRS-NSP Network Splitter. An external power supply that is connected to a network splitter only adds power to the tap-offs.

•PRS-FIN(S), PRS-FINNA Fiber Interface. An external power supply that is connected to a fiber interface only adds power to the Praesideo system bus.

•LBB4433/00 Call Station Kit. An external power supply that is connected to a call station kit only adds power to the call station kit.

•PRS-CSI Call Station Interface. An external power supply that is connected to a call station interface only adds power to call station interface and optionally to the connected remote call station (kit).

•PRS-CSR Remote Call Station. An external power supply that is connected to a remote call station only adds power to the remote call station and optionally to the connected call station interface.

•PRS-CSRK Remote Call Station Kit. An external power supply that is connected to a remote call station kit only adds power to the remote call station kit and optionally to the connected call station interface.

The amount of Watt provided by an external power supply is calculated as follows:

33.4Power sources

By default, the only power source in the system is the network controller. Each system bus connector on the rear of the network controller provides 55 Watt.

P = U ⋅ I

Bosch Security Systems 2011-02