Application Examples; Introduction; Plena; Application Areas - Bosch Plena Installation And User Instruction Manual

Plena Voice Alarm System | Installation and User Instructions | Application examples
2

Application examples

2. 1

Introduction

In a Plena Voice Alarm System, any of the various units
offered by the Plena product family, can be combined
together, in order to satisfy with any of your specific
configuration requirements. This chapter provides a
number of examples, each describing a specific system
configuration. You can use these examples and quickly
adapt them to meet your own configuration

requirements.

2.1.1

Plena

The Plena Voice Alarm System is part of the Plena
product range. Plena provides public address solutions
for places where people gather to work, worship, trade
or simply enjoy themselves. It is a family of system
elements that are combined to create public address
systems tailored for virtually any application. The range
includes mixer, pre-, system- and booster amplifiers, a
source unit, digital message manager, feedback
suppressor, call stations, an 'All-in-One' system and a
voice alarm system. Each element is designed to
complement all others thanks to matched acoustical,
electrical and mechanical specifications.
2.1.2

Application areas

Typically, the Plena Voice Alarm System is used to
create small systems that must comply witih emergency
and evacuation standards, medium-sized systems in
which one call channel is enough and large systems that
consists of many small zones.
The application areas of a Plena Voice Alarm System
include:
• Schools, see section 2.2.
• Swimming pools, see section 2.3.
• Shopping malls, see section 2.4.
• Hotels, see section 2.5.
Other areas include: factories, high-rise buildings, office
buildings, recreational facilities and small airports.
Bosch Security Systems | 2004-06 | 9922 141 10371en
2.2

Application: School

2.2.1 Introduction
Schools are typical example of applications with a large
number of zones each with a relatively low output
power requirement per zone. The main priorities are
speech intelligibility and compliance with IEC60849
standard (or equivalent).
2.2.2 Requirements
In addition to mandatory voice alarm functionality for
evacuating staff and students, Econtroller systems for
schools should also include chime tones for notifying
the start/finish of lessons, plus public address
functionality for individually calling classrooms or
public area. BGM is not essential. Since a classroom has
a low ambient noise level, one loudspeaker is usually
sufficient, keeping the total power requirement
relatively low. Outside areas such as playgrounds and
sports fields will require weatherproof horn
loudspeakers.
table 2. 1 : Summary of requirements
Requirements
30 zones (typically 20 to 60 zones).
Speech intelligibility is the main priority.
Low power requirement (one loudspeaker) per
classroom.
Fireman's panel by main entrance.
Call station in main office.
Additional public address functions such as chime
tones desirable.
BGM in recreation areas is optional.
2.2.3

Solution

The Plena voice alarm controller handles message
routing to 6 zones, the remaining 24 zones require four
additional 6-zone routers. The office is equipped with a
call station plus keypads for individually addressing
zones, while a fireman's panel (with overall priority) is
built in by the main entrance.
2.2.4

Power requirements

The voice alarm controller features a built-in 240 W
booster amplifier, making it possible to drive up to 40
loudspeakers with a power handling capacity of 6 W
each. This is sufficient for a medium-sized high school
with 24 classrooms, four toilets/changing rooms, a staff
en | 11