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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | EN54-16: 2008 en | 48
13.5.3 A single short circuit or an interruption in any voice
alarm transmission path between distributed cabinets of a
VACIE shall not prevent the activation of a voice alarm
output condition to more than one voice alarm zone for
longer than 100 s following the occurrence of the fault.
The voice alarm transmission path between distributed
cabinets of the Praesideo system is achieved by means of
the system bus.
A single interruption or short circuit in any data segment of
this system bus does not prevent proper functioning of the
system (including activation of a voice alarm output
condition to more than one voice alarm one) as long as the
system has redundant cabling.
The system bus also offers a power circuit. This power
circuit is used to provide power to system elements that do
not have its own main power supply. These elements are:
audio expander, CobraNet interface, multi channel
interface, call station basic with call station keypads, call
station kit with call station keypad kits, call station interface,
remote call station with call station keypads, remote call
station kit with call station keypad kits. A single interruption
or short circuit in the power circuit of the system bus can
affect these system elements, since they will lose their
power and therefore be turned off. However this can be
fixed by proper installation and configuration for the
following elements:
• multi-channel interface - this unit can be
configured to use a connected basic amplifier as its
power source (default setting) to share the main
and backup power supply of the basic amplifier.
• call station kit - a backup power supply can be
connected in order to power the call station
externally if the network power supply fails.
• call station interface - a backup power supply can
be connected in order to power the call station
interface externally if the network supply fails; this
back-up power supply can then power both the call
station interface and the connected remote call
station.
• remote call station - an external power supply can
be connected in order to power the call station
externally if the network power supply fails.
• remote call station kit - a backup power supply can
be connected in order to power the call station
externally if the network power supply fails.
The basic call station does not have a backup power supply
and should therefore not be used as voice evacuation call
station. The installer must take care of proper installation
and configuration of the system.
The audio expander and CobraNet interface units will not
prevent the activation of a voice alarm output condition to
more than one voice alarm zone as long as they do not
interrupt the system bus when the network power supply
fails. This can be achieved in two ways: either by installing
them on tap-off points in the network using a network
splitter or by ensuring all of these units are placed together
on the ring with no other type of units in between them. This
way they can never break the redundant ring. The installer
must deplory one of these solutions in the system
installation.
13.5.4 If the VACIE is designed to be used with a power
supply (item L of Figure 1 of EN 54-1) contained in a
separate cabinet, then an interface shall be provided for at
least two voice alarm transmission paths to the power
supply, such that a short circuit or an interruption in one
does not affect the other.
If a 19”-cabinet (rack) or adjacent cabinets provide enough
space for the battery and/or charger, the installer can install
the complete PSE (power supply equipment) as referred in
EN54-4 in one cabinet. In that case this requirement is not
applicable.
In case the installer installs the backup part of the PSE
(battery and charger) in a separate cabinet, Praesideo
provides a separate (monitored) DC-backup connection on
the Praesideo units. This implies that a Praesideo
installation will always have two separate voice alarm
transmission paths to the power supply: one for mains and
one for DC backup. Both will not influence each other.
The installer must take care that the installation complies
with this requirement.
Clause / Requirement Compliance Signature