Bosch LBB1930/20, LBB1935/20, LBB1938/20, LBB1938/70 Installation And Operation Manual
Plena Power Amplifiers
LBB1930/20, LBB1935/20, LBB1938/20, LBB1938/70
en Installation and Operation manual
Table of contents
1
Safety 4
2
About this manual 5
2.1 Manual purpose 5
2.2 Digital document 5
2.3 Intended audience 5
2.4 Alerts and notice signs 5
2.5 Conversion tables 6
2.6 Copyright and disclaimer 6
2.7 Document history 6
3
System Overview 7
3.1 Product range introduction 7
3.2 Power amplifier range 7
4
Installation 8
5
Connection and indicators 9
5.1 Front panel indicators 9
5.2 Rear panel connectors and switches 9
5.3 Internal setting 11
6
External connections 12
6.1 Connect the back-up power supply 12
6.2 Connecting line input and loop-through 12
6.3 100V slave input 13
6.4 Constant voltage loudspeakers 13
6.5 Low impedance loudspeakers 14
6.6 Priority controlled loudspeaker 15
6.7 Power 15
7
Supervision 16
7.1 Input pilot tone 16
7.2 Battery supervision 16
7.3 Mains supervision 16
8
Operation 17
8.1 Switch ON 17
8.2 Connecting the priority input and using the control terminals 18
9
Maintenance 19
10
Technical data 20
10.1 Electrical 20
10.1.1 Mains voltage 20
10.1.2 Battery voltage 20
10.1.3 Rated power 20
10.2 Performance 20
10.2.1 Signal performance 20
10.2.2 Signal-to-Noise Ratios 20
10.2.3 Line inputs 21
10.2.4 Loudspeaker outputs 21
10.2.5 Power consumption 22
10.3 Mechanical specifications 24
10.4 Environmental conditions 24
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Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Safety
Prior to installing or operating products, always read the Important Safety Instructions which
are available as a separate multilingual document: Important Safety Instructions (Safety_ML).
These instructions are supplied together with all equipment that can be connected to the
mains supply.
Safety precautions
The Power Amplifier designed to be connected to the public distribution network.
– To avoid any risk of electric shock, all interventions must be carried out with
disconnected mains supply.
– The ventilation should not be impeded by covering the ventilation openings.
– Connection of external wiring to this equipment requires installation by qualified
personnel only.
– The operation must only be performed by qualified personnel.
– Use the apparatus in a moderate climate.
!
Caution!
These service instructions are for use by qualified service personnel only.
To reduce the risk of electric shock, do not perform any servicing other than that contained in
the operating instructions unless you are qualified to do so.
1
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2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
About this manual
Manual purpose
The purpose of this manual is to provide information required for installing, configuring,
operating and maintaining the Plena Power Amplifier.
The following related documents are available:
– Plena Voice Alarm System Operation manual.
– Plena Voice Alarm System Software manual.
Digital document
This manual is available as a digital document in the Adobe Portable Document Format (PDF).
Refer to the product related information at: www.boschsecurity.com.
Intended audience
This manual is intended for installers, operators and users of a Plena system.
Alerts and notice signs
Four types of signs can be used in this manual. The type is closely related to the effect that
may be caused if it is not observed. These signs - from least severe effect to most severe
effect - are:
Notice!
Containing additional information. Usually, not observing a ‘notice’ does not result in damage
to the equipment or personal injuries.
!
Caution!
The equipment or the property can be damaged, or persons can be lightly injured if the alert
is not observed.
!
Warning!
The equipment or the property can be seriously damaged, or persons can be severely injured
if the alert is not observed.
Danger!
Not observing the alert can lead to severe injuries or death.
2
2.1
2.2
2.3
2.4
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Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Conversion tables
In this manual, SI units are used to express lengths, masses, temperatures etc. These can be
converted to non-metric units using the information provided below.
1 in = 25.4 mm 1 mm = 0.03937 in
1 in = 2.54 cm 1 cm = 0.3937 in
1 ft = 0.3048 m 1 m = 3.281 ft
1 mi = 1.609 km 1 km = 0.622 mi
Table 2.1: Conversion of units of length
1 lb =
0.4536 kg 1 kg = 2.2046 lb
Table 2.2: Conversion of units of mass
1 psi =
68.95 hPa 1 hPa = 0.0145 psi
Table 2.3: Conversion of units of pressure
Notice!
1 hPa = 1 mbar
°F = _ . °C + 32
9
5
°C = _ . (°F - 32)
5
9
Copyright and disclaimer
All rights reserved. No part of this document may be reproduced or transmitted in any form by
any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior
written permission of the publisher. For information on getting permission for reprints and
excerpts, contact Bosch Security Systems B.V..
The content and illustrations are subject to change without prior notice.
Document history
Release date Documentation version Reason
2014.01.10 V1.0 1st edition.
2014.01.21 V1.1 2nd edition. Minor technical
data changes.
2.5
2.6
2.7
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2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
System Overview
Product range introduction
The Power Amplifier is part of the Plena product range. The Plena product range provides
public address solutions for places where people gather to work, worship, trade, or to relax. It
is a family of system elements that are combined to create public address systems tailored for
virtually any application. The Plena product range includes:
– Mixers
– Pre‑amplifiers
– Power amplifiers
– Music source unit
– Digital message manager
– Feedback suppressor
– Call stations
– "All-In-One" system
– Voice Alarm System
– Timer
– Charger
– Loop amplifier
The various elements are designed to complement each other using matched acoustical,
electrical and mechanical specifications.
All Plena Power Amplifiers in this manual are designed for use in EN54‑16 and EN60849
compliant systems.
Power amplifier range
The Plena Power Amplifier range consists of the following mono amplifiers:
– 120W LBB 1930/20 (2 units high).
– 240W LBB 1935/20 (2 units high).
– 480W LBB 1938/x0 (3 units high).
In this manual all illustrations show either the LBB 1938/x0 power amplifier that is 3 units
high, the LBB 1930/20, LBB 1935/20 power amplifier that is 2 units high. All connections are
similar between the different power amplifiers. These power amplifiers have 70V and 100V
constant voltage outputs and a low impedance output for 4 or 8 Ohm loudspeakers.
Two inputs, "Priority" and "Program", give priority and controlled outputs. A 100V slave input
gives connection to existing loudspeaker lines. The line inputs are balanced and have a
loop‑through facility. The amplifiers have overload and short‑circuit protection. A temperature
controlled fan and overheat protection gives high reliability. Battery operation with automatic
switchover from the mains supply is available.
3
3.1
3.2
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Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Installation
The power amplifier is intended for tabletop use, however the unit can also be mounted in a
19” rack. For 19" rack installation; use:
– The 19" rack mounting brackets which come with the product.
– Standard M6 mounting screws: 16 mm thread depth, 20 mm total length.
The power amplifier has an internal fan regulated to keep the temperature inside the unit
within safe operating conditions.
0dB
-6dB
-2
0d
B
Figure 4.1: Brackets for 19" rack mounting
Notice!
If you install the product into a 19” rack:
- Ensure that it does not exceed the overheating temperature (+45°C ambient).
- Make sure that warm air that is expelled from the side and rear can flow away.
- Ensure sufficient ventilation and enough room, about 10cm / 4” behind the unit for cables
and connections.
- Use the included Bosch 19” mounting brackets (LBC 1901/00) x2.
- Remove the tabletop feet from the bottom of the unit.
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2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
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