Bosch PLENA LBB1938/30 Bedienungsanleitung

PLENA power amplifiers

LBB1930/20| LBB1935/20| LBB1938/30| LBB1938/70

en Installation and operation manual

PLENA power amplifiers Table of contents | en 3

Bosch Security Systems B.V. Installation and operation manual 2018.11 | V1.2 | LBB193x/x0

Table of contents

1Safety 4

2About 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

3System Overview 7

3.1 Product range introduction 7

3.2 Power amplifier range 7

4Installation 8

5Connection and indicators 9

5.1 Front panel indicators 9

5.2 Rear panel connectors and switches 9

5.3 Internal setting 11

6External connections 12

6.1 Connect the backup 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

7Supervision 16

7.1 Input pilot tone 16

7.2 Battery supervision 16

7.3 Mains supervision 16

8Operation 17

8.1 Switch ON 17

8.2 Connecting the priority input and using the control terminals 18

9Maintenance 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

4en | Safety PLENA power amplifiers

2018.11 | V1.2 | LBB193x/x0 Installation and operation manual Bosch Security Systems B.V.

1 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 is 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.

PLENA power amplifiers About this manual | en 5

Bosch Security Systems B.V. Installation and operation manual 2018.11 | V1.2 | LBB193x/x0

2 About this manual

2.1 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.

2.2 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.

2.3 Intended audience

This manual is intended for installers, operators and users of a Plena system.

2.4 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.

6en | About this manual PLENA power amplifiers

2018.11 | V1.2 | LBB193x/x0 Installation and operation manual Bosch Security Systems B.V.

2.5 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

Tab.2.1: Conversion of units of length

1 lb = 0.4536 kg 1 kg = 2.2046 lb

Tab.2.2: Conversion of units of mass

1 psi = 68.95 hPa 1 hPa = 0.0145 psi

Tab.2.3: Conversion of units of pressure

Notice!

1 hPa = 1 mbar

°F = _. °C + 32

°C = _. (°F - 32)

2.6 Copyright and disclaimer

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.

2.7 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.

2018.11.05 V1.2 3rd edition. LBB1938/20

replaced by LBB1938/30.

PLENA power amplifiers System Overview | en 7

Bosch Security Systems B.V. Installation and operation manual 2018.11 | V1.2 | LBB193x/x0

3 System Overview

3.1 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.

3.2 Power amplifier range

The Plena Power Amplifier range consists of the following mono amplifiers:

– 120W LBB1930/20 (2 units high).

– 240W LBB1935/20 (2 units high).

– 480W LBB1938/x0 (3 units high).

In this manual all illustrations show either the LBB1938/x0 power amplifier that is 3 units high

or the LBB1930/20 and LBB1935/20 power amplifiers that are 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.

8en | Installation PLENA power amplifiers

2018.11 | V1.2 | LBB193x/x0 Installation and operation manual Bosch Security Systems B.V.

4 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.

0 dB

-6 dB

-20 dB

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.

- Remove the tabletop feet from the bottom of the unit.

PLENA power amplifiers Connection and indicators | en 9

Bosch Security Systems B.V. Installation and operation manual 2018.11 | V1.2 | LBB193x/x0

5 Connection and indicators

5.1 Front panel indicators

0 dB

-6 dB

-20 dB

taehrevOyrettaB MainsPilot-Tone

Status

1 2 3 4 5 6

Figure5.1: LBB1930/20, LBB1935/20 and LBB1938/x0

1. VU meter LED’s for -20, -6, 0dB and power ON.

2. Pilot‑tone supervised function that monitors a 20kHz pilot tone.

3. Battery supervised function to indicate battery operation.

4. Mains supervised function to indicate mains supply.

5. Overheat supervised function to give warning of overheating.

6. Air inlet cooling is made by forced ventilation from front to back. Amplifiers can be

stacked on top of each other. A supply of cool air from the front is necessary.

5.2 Rear panel connectors and switches

Priority Only No Priority

100V 0 1 00V 0

Priority Controlled Output

O On

24V DC In

Apparatus delivered

connectored for 230V~

Main Power

BatteryInput

Fault Relays' Output

NO COM NC O On

NO COM NC NO COM NC

Input 1 Pr iority

Loopthrough1

Input 2 Pr ogram

Loopthrough2

Input 1 Pr iority

2...24V- Input 1

0V- I nput2

Input 2 Enabl e

2..24V- Ena ble

0V- Mute

100V

Sla ve I nput100V

100V

70V

8ohm

100V/70V

Sele ction ( 12A)

Priori ty Only

No Prior ity

Priori ty

F701

F702

Battery

Power

Detection

Pilot-tone

Detector

230V~ 240V~

Rated input

Power : 1600VA

Input 1

Pr iority

Slave Inpu t

100V

Input 2

Enable

100V 0 100V 70V0 0 8

Di re ct O ut pu t

InputInput

Input 2-Progr a mInput 1-Pr i ority

2..24 V

Default O

GND 2..24V

Default O n

GND

20 19 18 17 16 1415 13

1 2 3 5 64 7 8 9

Figure5.2: LBB1930/20 and LBB1935/20

10 en | Connection and indicators PLENA power amplifiers

2018.11 | V1.2 | LBB193x/x0 Installation and operation manual Bosch Security Systems B.V.

141517 16181920

Figure5.3: LBB1938/30

Apparatus

delivered

connectored

for 230V~

Inp ut 1 Prior ity

Loo pthrou gh 1

Inpu t 2 Progr am

Loo pthrou gh 2

Inpu t 1 Prior ity

2.. .24V- I nput 1

0V- I nput 2

Inpu t 2 Enabl e

2.. 24V- Ena ble

0V- M ute

100V

Sla ve Input 1 00V

Rated input

Power : 1600VA

O On

Main Power

BatteryInput

Fault Relays' Output

NO COM NC O On

NO COM NC NO COM N C

Battery

Detection

Pilot-tone

Detector

InputInput

Input Output

Input 2-Progr

Power

amInput 1-Pr iority

Input 1

Pr iority

Slave Inpu t

100V

Input 2

Enable

100V 0

2..24 V

Defau lt O

GND 2..24 V

Defau lt O n

GND

24V DC In

Priority Only No Priority

100V 100V 0V0V

Priority Controlled Output

100V 70V0 0 8

Di re ct O ut pu t

100V

70V

8ohm

100V /70 V

Sele ction ( 12A)

Prio rity On ly

No Pri ority

Prio rit y

F701

F702

141517181920 16

1 2 3 5 64 7

Figure5.4: LBB1938/70

Note that slight deviations from the rear panel layout shown may occur.

1. Priority line input 1 (XLR/balanced)

2. Level control input 1

3. Priority loopthrough output1 (XLR/balanced)

4. Program line input 2 (XLR/balanced)

5. Level control input 2

6. Program loopthrough output 2 (XLR/balanced)

7. Priority controlled loudspeaker output terminals

8. 24 Vdc power supply terminals

9. Earth connection screw

10. Mains fuse (T10A)

11. Mains connector (3-pole)

12. ON - OFF switch

13. Voltage selector (Not on LBB1938/x0)

14. Loudspeaker direct output terminals

15. Battery detection

16. Fault relay output

17. Pilot-tone detection

18. 100 V slave input terminals

19. Input 2 enable control terminals

20. Input 1 priority control terminals

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