Bosch PLN-1LA10 Specifications

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Bosch PLN-1LA10 Specifications | Manualzz

Plena Loop Amplifier

en

Installation and User Instructions

PLN-1LA10

Plena Loop Amplifier | Installation and User Instructions | Important safeguards

Important safeguards

Before you install or operate the Plena Loop Amplifier, you must read the Important Safety Instructions. The

Important Safety Instructions are supplied together with the Plena Loop Amplifier.

en | 3

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Plena Loop Amplifier | Installation and User Instructions | Acknowledgements

Acknowledgements

Bosch Security Systems thanks the NVVS (Dutch

Association of Hard of Hearing People) for the valuable information that was provided during the development of the Plena Loop Amplifier and the creation of the

Installation and User Instructions.

en | 4

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Plena Loop Amplifier | Installation and User Instructions | About this manual en | 5

About this manual

Signs

The Installation and User Instructions shows each precaution with a sign. The sign shows the effect if you do not obey the instruction.

Function

The Installation and User Instructions gives the installers and operators the necessary data to install, configure and operate the Plena Loop Amplifier.

Precaution

General sign for cautions and warnings.

Digital version

The Installation and User Instructions is available as a digital file (Portable Document File, PDF).

When the PDF refers you to a location that contains more data, you can click the text to go there. The text contains hyperlinks.

Precaution

Risk of electric shock.

Precautions and notes

The Installation and User Instructions uses precautions and notes. The precaution gives the effect if you do not obey the instructions. These are the types:

Note

A note gives more data.

Caution

If you do not obey the caution, you can cause damage to the equipment.

Warning

If you do not obey the warning, you can cause personal injury or death.

The sign that is shown along with a note gives more data about the note itself.

Note

General sign for notes.

Note

Refer to another information source.

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Plena Loop Amplifier | Installation and User Instructions | About this manual

Conversion tables

Length, mass and temperature are in SI units. Refer to the data below to change SI units to imperial units.

table 1: Conversion of units of length

1 in = 25.4 mm 1 mm =

1 in =

1 ft =

1 mi =

2.54 cm

0.3048 m

1.609 km

1 cm =

1 m =

1 km =

0.03937 in

0.3937 in

3.281 ft

0.622 mi

table 2: Conversion of units of mass

1 lb = 0.4536 kg 1 kg = 2.2046 lb

table 3: Conversion of units of pressure

1 psi = 68.95 hPa 1 hPa = 0.0145 psi

Note

1 hPa = 1 mbar.

table 4: Conversion of units of temperature

°

F

=

9

5

⋅ °

C

+ 32

°

C

=

5

9

⋅ ( °

F

32

) en | 6

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Plena Loop Amplifier | Installation and User Instructions | Table of contents en | 7

Table of contents

Important safeguards ...................................................................................................................................................3

Acknowledgements.......................................................................................................................................................4

About this manual .........................................................................................................................................................5

Table of contents ...........................................................................................................................................................7

1.

System overview ...........................................................................................................................................................9

1.1

Loop amplifier ...........................................................................................................................................................................9

1.2

Induction loop systems ..........................................................................................................................................................9

1.2.1

Introduction .........................................................................................................................................................................9

1.2.2

Principle ...............................................................................................................................................................................9

1.2.3

Benefits ............................................................................................................................................................................. 10

1.3

Plena ....................................................................................................................................................................................... 10

1.4

Block diagram ....................................................................................................................................................................... 10

1.5

Supervision ............................................................................................................................................................................ 10

1.6

Quadrature system .............................................................................................................................................................. 10

1.7

Controls, connectors and indicators ............................................................................................................................... 12

1.7.1

Front view ......................................................................................................................................................................... 12

1.7.2

Rear view .......................................................................................................................................................................... 12

2.

Design and planning ................................................................................................................................................. 13

2.1

Introduction ............................................................................................................................................................................ 13

2.2

System types ......................................................................................................................................................................... 13

2.2.1

Simple system ................................................................................................................................................................. 13

2.2.2

Quadrature systems ....................................................................................................................................................... 13

2.2.3

Expanded quadrature systems .................................................................................................................................... 15

2.2.4

Low-spill system .............................................................................................................................................................. 15

2.3

Induction loops ..................................................................................................................................................................... 16

2.3.1

Introduction ...................................................................................................................................................................... 16

2.3.2

Position ............................................................................................................................................................................. 16

2.3.3

Wire diameter .................................................................................................................................................................. 16

2.3.4

Magnetic field strength .................................................................................................................................................. 16

2.3.5

Connection ....................................................................................................................................................................... 16

2.3.6

Configuration ................................................................................................................................................................... 16

2.4

Potential problems ............................................................................................................................................................... 18

2.4.1

Metal loss ......................................................................................................................................................................... 18

2.4.2

Overspill ............................................................................................................................................................................ 18

2.4.3

Earth loops ....................................................................................................................................................................... 18

3.

Installation ................................................................................................................................................................... 19

4.

External connections ................................................................................................................................................ 21

4.1

Induction loops ..................................................................................................................................................................... 21

4.2

Audio inputs .......................................................................................................................................................................... 21

4.3

Priority input ........................................................................................................................................................................... 22

4.4

Fault output ............................................................................................................................................................................ 23

4.5

Line output ............................................................................................................................................................................. 23

4.6

Power supply ......................................................................................................................................................................... 23

4.7

Slave to Master ..................................................................................................................................................................... 25

4.8

Slave to slave ........................................................................................................................................................................ 25

5.

Configuration .............................................................................................................................................................. 27

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5.1

Master and slaves ................................................................................................................................................................ 27

5.2

Electric current ...................................................................................................................................................................... 27

5.2.1

Master induction loops .................................................................................................................................................. 27

5.2.2

Slave induction loops .................................................................................................................................................... 28

5.2.3

Bracket .............................................................................................................................................................................. 28

5.3

Metal loss compensation .................................................................................................................................................... 28

5.4

Supervision ............................................................................................................................................................................ 29

5.5

Fault contact .......................................................................................................................................................................... 29

5.6

Priority input ........................................................................................................................................................................... 29

5.7

AGC/Limiter .......................................................................................................................................................................... 29

5.7.1

Introduction ...................................................................................................................................................................... 29

5.7.2

Switch on and off ........................................................................................................................................................... 29

5.7.3

Range ................................................................................................................................................................................ 30

5.8

Frequency range ................................................................................................................................................................... 30

5.9

Audio inputs .......................................................................................................................................................................... 30

5.9.1

Sensitivity ......................................................................................................................................................................... 30

5.9.2

Phantom power ............................................................................................................................................................... 30

5.9.3

Voice activation ............................................................................................................................................................... 31

6.

Operation ..................................................................................................................................................................... 33

6.1

Switch on ............................................................................................................................................................................... 33

6.2

Switch off ............................................................................................................................................................................... 33

6.3

Change volume ..................................................................................................................................................................... 33

6.4

Change tone .......................................................................................................................................................................... 34

6.5

Condition LEDs .................................................................................................................................................................... 34

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Plena Loop Amplifier | Installation and User Instructions | System overview en | 9

1 System overview

The PLN-1LA10 Plena Loop Amplifier has been designed as a very high-quality amplifier for medium to large size induction loop systems. Ease of installation and use have been major factors in the design, combined with optimized performance.

1.2.1

Introduction

An induction loop system consists of a looped wire that is installed along the walls of a room and a loop amplifier.

1.2.2

Principle

The loop amplifier changes incoming audio signals in an alternating electric current that is sent through the induction loop. The strength and frequency of the electric current varies with the tone and the amplitude of the incoming audio signal and generates an alternating magnetic field inside the induction loop.

People with assistive listening devices who are located inside the induction loop, can put their assistive listening devices in the

T

or

MT

mode to listen to the audio signals.

figure 1.1: Plena Loop Amplifier table 1.1: Performance

Frequency response:

60 Hz to 10 kHz (+1/-3 dB, @ -10 dB @ rated output

Distortion:

< 1% @ rated output, 1 kHz

Bass control:

-8/+8 dB @ 100 Hz

Treble control:

-8/+8 dB @ 10 kHz

In the T or MT mode, a little coil is activated ( T stands for ‘tele-coil’). The coil receives the alternating magnetic field and changes it into an alternating voltage, which the assistive listening devices change into an audio signal. This audio signal is not entirely the same as the incoming audio signal of the loop amplifier, because the assistive listening devices also compensate for individual hearing disabilities (for example, signal strength and frequency range).

T/MT

4

table 1.2: Certifications and approvals

EMC emission: acc. to EN55103-1

EMC immunity: acc. to EN55103-2

Safety: acc. to EN60065

Induction loop systems: acc. to EN60118-4 acc. to IEC118-4

1 2 3

figure 1.2: Assistive listening device

1

2

3

4

5

table 1.3: Assistive listening device

No.

Description

Tele-coil

Microphone

Gain control

Amplifier

Earphone

5

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1.2.3

Benefits

Ambient noise prevents hard-of-hearing people from listening to a specific sound in a room. The ambient noise can result from other people in the room, equipment, but also from the acoustics. Depending on the acoustics of the room, hard-of-hearing people already find the reflected noise a strain when the distance between them and the speaker is more than

2 m. The induction loop, to which the hard-of-hearing people can listen with their assistive listening devices, virtually reduces the distance to the speaker. Their distance to the speaker seems equal to the distance between the speaker and the microphone.

Refer to figure 1.4 for a block diagram of the Plena

Loop Amplifier.

1.5 Supervision

All vital functions of the loop amplifier are supervised.

The loop amplifier checks its internal power amplifier, the integrity of the connected induction loop and the priority input with a pilot tone. When a supervised function fails, a LED on the front panel of the loop amplifier is lit and the fault contact is de-energized.

1.3 Plena

The Plena Loop Amplifier 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 power amplifiers, a source unit, digital message manager, feedback suppressor, conventional and PC 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.

One of the key features of the Plena Loop Amplifier is that it can be used in quadrature systems. In a quadrature system, an even number of Plena Loop

Amplifiers work together to create a magnetic field that has the same strength throughout the whole covered area and drops rapidly to zero beyond the borders of the covered area. This is achieved by introducing a phase difference of 90° in the electric current that flows through two adjacent induction loops.

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1 2 3

0 dB

-6 dB

-20 dB

Power

1 2

Master

1 5

Current

10

Loop

Integrity

11

0

10

0

_

+

_

+

9

0

8 7

12 13 14

Metal loss compensation

Master In

VU LED

PRE Amp. POST Amp.

Slave Out

Master Slave

Priority input

90º

1

Line Out

15 16

Fault

Supervision

NO

C

NC

2

On Off

AGC

AGC Limiter 5K 10K

100V 0

Vox Mix

figure 1.3: Front and rear views

25 24 23 22

Phantom

On Off Mic Line

21

Phantom

On Off Mic Line

Priority input

100V

0

AGC

6

20

Fault

Limiter

Line fuse: 230V 3A

115V 6A

Loop

Out Com

19

5 4

17 18

115V 230V

Apparatus delivered

Connected for 230V

Master in

1

2

Phantom

Mic

Line

Bal. input

Mic

Line

Bal. input

Vox Mix

Mute

Tone

Priority control

Limiter

90º

Slave out

Master

Out

Com

90º 0º

figure 1.4: Block diagram

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1.7 Controls, connectors and indicators

1.7.1

Front view

The front of the loop amplifier (refer to figure 1.3) contains:

1

Power LED/VU Meter

- A combined power LED and VU meter. The green power LED comes on when the loop amplifier is switched on. The VU meter shows the master VU level: 0 dB (red), -6 dB,

-20 dB (yellow).

2

Electric current meter

- Show the electric current through the induction loop.

3

Fault LED

- Comes on when a supervised function

of the loop amplifier fails (refer to section 6.5).

4

Headphones socket

- Connects headphones to the loop amplifier.

5

Limiter LED

- Comes on when the limiter is active

(refer to section 6.5).

6

AGC LED

- Comes on when the automatic gain

control (AGC) is active (refer to section 6.5).

7

Loop integrity LED

- Comes on when the

induction loop is intact (refer to section 6.5).

8

Master volume control

- Sets the maximum electric current that flows through the induction loop

(refer to section 5.2).

9

Tone controls

- Controls the high and low tones of the audio signal on the induction loop (refer to

section 6.4).

10

Input volume controls

- Control the volume of

audio input 1 and audio input 2 (refer to section 6.3).

11

On/off switch

- Switches the loop amplifier on and

off (refer to section 6.1 and section 6.2).

1.7.2

Rear view

The rear of the loop amplifier (refer to figure 1.3) contains:

12

Metal loss compensation control

- Controls the

metal loss compensation (refer to section 5.3).

13

Master/slave sockets

- Connect master and slaves

to the loop amplifier (refer to section 4.7).

14

Line output

- Connects an external recording

device to the loop amplifier (refer to section 4.5).

15

Fault output

- Sends the condition of the loop

amplifier to other equipment (refer to section 4.4).

16

Supervision switch

- Switches supervision of the

priority input on and off (refer to section 5.4).

17

Voltage selector

- Selects the voltage on which the

loop amplifier must operate (refer to section 4.6).

18

Power inlet

- Connects the loop amplifier to the mains power supply with a power cable (refer to

section 4.6).

19

Ground screw

- Connects the loop amplifier to ground.

20

Induction loop output

- Connects the induction

loop to the loop amplifier (refer to section 4.1).

21

Audio inputs

- Connects the loop amplifier to

external audio inputs (refer to section 4.2).

22

Priority input

- Connect the loop amplifier to systems that can override the audio signal on the

induction loop (refer to section 4.3). For example, a

Plena Voice Alarm System or a Praesideo system.

23

Frequency range switch

- Select the frequency range of the audio signal on the induction loop (refer

to section 5.8).

24

AGC/Limiter switch

- Selects the automatic gain

control (AGC) or the limiter (refer to section 5.7.2).

25

AGC range control

- Controls the range of the

automatic gain control (see section 5.7.3).

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Plena Loop Amplifier | Installation and User Instructions | Design and planning en | 13

2 Design and planning

2.1 Introduction

We advise you to contact the local association of hard-of-hearing people to make sure that the induction loop system will be satisfactory in every way.

When you connect more than one induction loop to a

(master) loop amplifier, make sure that the induction

loops are of the same size (refer to figure 2.2).

2.2.1

Simple system

A simple induction loop system consists of a (master) loop amplifier with one or more induction loops (refer

to figure 2.1 and figure 2.2).

M

M

figure 2.1: Simple system, single loop figure 2.2: Simple system, multiple loops

2.2.2

Quadrature systems

2.2.2.1

Introduction

One of the key features of the Plena Loop Amplifier is that it can be used in quadrature systems. In a quadrature system, an even number of Plena Loop

Amplifiers work together to make a magnetic field that has the same strength throughout the whole covered area drops fast to zero beyond the borders of the covered area.

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Plena Loop Amplifier | Installation and User Instructions | Design and planning en | 14

2.2.2.2

Simple quadrature system

A simple quadrature system consists of (refer to

figure 2.3):

• A master loop amplifier ( M ) with one induction loop.

• A slave loop amplifier (

S

) with one induction loop.

Note

Although it is not required, the sizes of the master and slave induction loops are typically the same.

To cover larger areas, create a basic system with

multiple induction loops (refer to figure 2.4 for an

example). Such a system consists of:

• A master loop amplifier ( M ) with multiple induction loops. All master induction loops must have the same size.

• A slave loop amplifier (

S

) with multiple induction loops. All slave induction loops must have the same size.

Note

Although it is not required, the sizes of the master and slave induction loops are typically the same.

M

90°

figure 2.3: Simple system, single loops

S

M

90°

90°

S

figure 2.4: Simple system, multiple loops

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2.2.3

Expanded quadrature systems

To cover very large areas, create an expanded

quadrature system (refer to figure 2.5 for an example).

Such a system consists of:

• A master loop amplifier (

M

) with one or more induction loops. All master induction loops must have the same size.

• An odd number of slave amplifiers ( S1 , S2 , S3 , etc.) with one or more induction loops. All slave induction loops must have the same size.

Note

Although it is not required, the sizes of the master and slave induction loops are typically the same.

2.2.4

Low-spill system

A special type of quadrature system is the low-spill

system (refer to figure 2.6 for an example). A low-spill

system makes sure that the magnetic field strength drops even more rapid to zero beyond the borders of the covered area. Such a system consists of:

• A master loop amplifier (

M

) with one or more induction loops. All master induction loops must have the same size.

• An odd number of slave amplifiers (

S1

in this example) with one or more induction loops. All slave induction loops must have the same size.

• Two slave amplifier ( S2 and S3 in this example) with one induction loop. The width of the induction loops must be between 50 and 66% of the width of the master induction loops.

S2

M

90°

90°

figure 2.5: Expanded system (example)

S1

S2

S3

M

90°

90°

50-66%W

W

S1

W

50-66%W

S3

figure 2.6: Low-spill system (example)

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2.3.1

Introduction

When you make an induction loop, you must take a number of parameters into consideration. However, sometimes there are special situations, which make the design and planning of the induction loop even more important. A number of potential problems and solutions will be discussed later.

For example, in a room with a width (W) of 10 m, the induction loop should be installed 0 to 0.4 m below or

2.4 to 2.8 m above the floor for the best audio quality and the smallest variation in the magnetic field strength.

2.3.3

Wire diameter

For the best audio quality, the DC (direct current) resistance of the induction loop must be between 1 and

3

. The DC resistance depends on the wire diameter and the wire length. Do as follows:

1 Calculate the wire length. The wire length depends on the size of the induction loop.

2 Use figure 2.9 to get the allowed wire diameter.

2.3.2

Position

For the best audio quality and the smallest variation in the magnetic field strength, the distance between the induction loop and the listening plane must be between

12 and 15% of the width of the room (refer to

figure 2.7).

For example, in a rectangular room with a width (W) of

10 m and a length (L) of 30 m, the wire length is 80 m.

According to figure 2.9, the wire diameter must be between 0.77 and 1.34 mm. Thus, you can use AWG 20 wire or a wire with a standard diameter of 1.00 mm.

Loop

Loop

L

H

2.3.4

Magnetic field strength

For the best audio quality, the vertical component of the magnetic field must be 100 mA/m ± 3 dB at 1.2 m above the floor in the area that is surrounded by an induction loop. The strength of the magnetic field depends on the electric current through the induction loop. Peaks in the strength of the magnetic field must be less than 400 mA/m at 1.2 m above the floor in the area that is surrounded by the induction loop.

W

figure 2.7: Position

2.3.5

Connection

Refer to section 4.1 for instructions that tell you how to

connect an induction loop to the loop amplifier.

2.3.6

Configuration

Refer to section 5.2 for instructions that tell you how to

configure the electric current through the induction loop.

Typically, you will install the induction loop in the floor or in the ceiling of a room. When the distance between the floor and the induction loop is too small (less than

8% of the width) or too large (more than 20% of the width), refer to figure 2.8. The figure 2.8 shows the extra power that the loop amplifier needs to make the correct magnetic field. The numbers next to the curves show the distance from the floor to the induction loop in % of the width (W) of the room.

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Plena Loop Amplifier | Installation and User Instructions | Design and planning

3

0

-1

-2

2

1

-3

-4

-5

-6

-7

-8

-9

-10

-11

-12

-13

-14

-15

-16

-17

-18

-19

0

10

20

30

40

50

60

70

80

90

100

10 20 30

figure 2.8: Extra power vs. the width of the room

40 50 width (%)

60 70 80 90 100

3.00

2.75

2.50

2.25

2.00

1.75

1.50

1.25

1.00

0.50

0.25

0.00

0

25

30

34

50

76 90100 135

150 200 wire length (m)

figure 2.9: Wire diameter vs. the wire length (copper wires)

250 300

303

350

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Plena Loop Amplifier | Installation and User Instructions | Design and planning

2.4.1

Metal loss

New buildings often contain a large amount of metal

(for example, meshes in concrete floors and ceilings).

The metal will have an effect on the high frequencies of the signal. You can adjust the tone of the audio signal on the induction loops with the Metal loss compensation control on the rear of the loop amplifier (refer to

section 5.3). The metal loss compensation is a variable,

signal dependent addition of high frequencies.

2.4.2

Overspill

The larger the induction loops, the more overspill.

When there is overspill, people outside the room with the induction loop system can overhear the audio signal on the induction loop. Overspill can also cause interference on other induction loop systems in the same building.

When you design a quadrature system (refer to

section 2.2.2 and section 2.2.3) or a low-spill system

(refer to section 2.2.4), you can avoid large induction

loops and thus avoid the potential problem of overspill.

2.4.3

Earth loops

Earth loops can cause interference on the induction loop system. You can avoid earth loops when you connect the shielding of cables only to one device.

en | 18

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3 Installation

The loop amplifier is sent to you in a box. Refer to

table 3.1 for the contents of the box.

Note

Always compare the contents of a shipment with the descriptions on the shipment documents.

table 3.1: Box

Description

Loop amplifier

Important Safety Instructions

Installation & User Instructions

Power cable

19” rack system brackets

Cover bracket

XLR cable

Quantity

1 x

1 x

1 x

1 x

2 x

1 x

1 x

Make sure that there is a free space of at least 100 mm on both sides of the loop amplifier for ventilation. The loop amplifier has a regulated internal fan, which keeps the temperature of the electronics within the safe range.

table 3.2: Physical characteristics

Dimensions (h x w x d):

94 x 430 x 320 mm (19” wide, 2U high)

Weight:

11.6 kg

table 3.3: Environmental conditions

Operating temperature:

+5 to +45 °C

Storage temperature:

-25 to +55 °C

Relative humidity:

< 95%

Caution

Do not unpack the box until you install and connect the loop amplifier.

Install the loop amplifier in a 19-inch rack system or on

a flat surface (refer to figure 3.1).

0 dB

-6 dB

-20 dB

Power

1

2

+

+

Master

1

5

Current

10

Fault

AGC

Limiter

figure 3.1: Installation

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Intentionally left blank.

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Plena Loop Amplifier | Installation and User Instructions | External Connections en | 21

4 External connections

Connect the induction loops to the rear of the loop

amplifier (refer to figure 4.1). Always twist wires that run

parallel and close to each other to avoid additional and undesired inductions.

You can connect audio sources to the audio inputs of the loop amplifier. For example, you can connect a power amplifier and a microphone (refer to figure 4.2). compens ation

Master In

Master in

Slave out

Priority in put

AGC

Limiter 5K 10K

90º

Line Out

100V

Vox

Mix

Fault

NO

NC

Supervis ion

On Off

Phanto

On

Off Mic

Line

Phantom

On Off Mic

Line

Line fuse

: 230V 3

A

Out

Loop

Com

115V

Connecte

230V d for 230

V

PLN-1LA10

Loop Amplifier

Line fuse

115V 6A

Out

Loop

Com compensa tion

Master In

Master in

Slave out

Slave Out

Priority inp ut

90º

Line Out

AGC Limiter

5K 10K

100V 0

Vox Mix

Fault

NO

NC

Supervisi on

On

Off

Phantom

On Off

Mic Line

Phantom

On

Off Mic

Line

Line fuse

Loop

Out Co

115V 6A m

115V

Connecte

230V d for 230V

figure 4.1: Induction loop, connection table 4.1: Induction loop, details

Number of connections:

1x screw terminal

Location:

Rear side

Current: max. 10 A peak, max. 6 A continuous

Induction loop DC resistance:

0.5 to 3

Induction loop area: max. 600m

2

@ 100 mA

RMS

/m

Vox

Mix

Phantom

On

Off

Phant om

On

Off

Mic

Phant om

On

Off

GND

1

-

3

+

2 line out

PLN-1P120

Power Amplifier

100V

0V

GND GND line out

100V

70V 0

0

8

24V DC

+

IN

230V-

240V-

Warn in

This ap paratus se

250V T1

A must be

Apparat us delive earthed red

230V-

figure 4.2: Audio inputs, connection table 4.2: Audio inputs, details

Number of connections:

2x XLR sockets

Location:

Rear side

Sensitivity:

Switchable, 1 mV/1 V

Impedance:

> 1 k

Dynamic range:

100 dB

Signal-to-noise ratio:

63 dB @ max. volume

75 dB @ min. volume/mute

Headroom:

25 dB

Phantom power:

Switchable, 16 V

VOX functionality:

Switchable, input 1 mutes input 2

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Plena Loop Amplifier | Installation and User Instructions | External Connections en | 22

You can connect other devices or systems to the priority input. The priority input has a higher priority than audio input 1 and audio input 2. When the priority input receives a signal, the loop amplifier replaces the signal on the connected induction loops with the signal of the priority input.

For example, you can connect a Plena Voice Alarm

System (refer to figure 4.3) to the priority input.

Caution

Install the safety bracket on the priority input to make sure that it is not possible to touch the

priority input (refer to figure 4.4).

PLN-1LA10

Loop Amplifier

Priority input

Metal los compens ation

Master In

Master

Slave ou

Slave O ut

90º

Priority in put

Line Out

AGC

Limiter

5K 10K

100V

Vox Mix

Fault

NO

NC

Phantom

On

Off

Mic Line

Supervis ion

On Off

Phantom

On

Off Mic

Line

Line fuse

Out

: 230V 3

Loop

Com

A

115V

230V d for 230

V

Priority input

Int Boo ster

Ext B ooster

A

Z1

Z2

100V

0

100V

Z3

Z4

0

100V

0

100V

0

1 Chan

BGM/ nel

2 Chan

BGM/

Spare

Call nel

B

100V

0

100V

0

100V

Z1

Z2

5K 10K

100V

0

LBB1990/00

Voice Alarm Controller

AGC

Limiter

5K 10K

100V

0

Vox

Mix

figure 4.4: Safety bracket

Z3 100V

Z4

100V

Z5 100V

Z6 100V

100V

DC In

24V

Int Boos ter

Ext B ooste BGM

1 Cha nnel

N.C./S /Call pare

Z1 100V

A

Z2 100V

Call nnel

/Spare

B

100V

Overrid e/Trigg er Outp ut

Z1 Z1

24V

100V

Z2 Z2

100V

100V

100V

Z3

Z3

Z4

Z4 Z5

Z6

Z5 TRG

100V

Z6

100V

70V

100V

Out

Call ou

GND

NC

EMG

COM

NO

NC

COM

NO

Fault

Call

NC

COM

NO

NC

24V

NO

Volum

TRG2

Out

Extern al Boo ster

Trigge

Emerge t/24V DC ou ncy

Busin ess

In

CD/Tu ner

DC ou

24V

Switch

VOX

DC ou

24V

VOX S witch

AUX

PC

Call sta tion For se rvice o nly

SEL1

SEL0

Firmw are

Upgrad

Off

Monito

APR mode

Superv

2ch op

LBB19 ision

94

On

Imped

Calibra ance tion

GND

Mic/Lin

Vox

Off

On

Vox

Speec

Phanto h filter m pow

Off

On

LBB 1990/0

Plena

Rated

S/N.

utput p output

Alarm power

Design

/60Hz

The N

8900

Contro

& Qua

60W nds ller

199 00

N663

001

USB

115V~

230V~

Fireman

's pane

App aratus

Conne delivere r 230V

Power input p ower:7 60VA

Line fu

T6.3L2

T10L2 se

50V fo r230V

Remote

Contro

LBB19 94 r115V AC

AC l Panel

Digital

Messa ge

Monito ring er

Router

This ap paratu s must be eart hed

figure 4.3: Priority input, connection table 4.3: Priority input, details

Number of connections:

1x screw terminal

Location:

Rear side

Input sensitivity:

100 V, transformer-balanced

Signal-to-noise ratio:

63 dB @ max. volume

75 dB @ min. volume/mute

Headroom:

25 dB

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Plena Loop Amplifier | Installation and User Instructions | External Connections en | 23

With the fault output (refer to figure 4.5), you can send

the condition of the loop amplifier to external devices

(for example, sounders).

You can connect a recording device (for example, a tape deck) to the line output of the loop amplifier (refer

to figure 4.6).

PLN-1LA10

Loop Amplifier

Metal loss compensation

Master In VU LED

PRE Amp. POST Amp.

Slave Out

0º 90º

Master Slave

Priority input

1

Line Out

AGC Limiter 5K 10K

Fault

Supervision

NO C NC

2

On Off

Phantom

On Off Mic Line

100V 0

Vox Mix

Phantom

On Off Mic Line

Line fuse: 230V 3A

115V 6A

Loop

Out Com

115V 230V

Apparatus delivered

Connected for 230V

Metal los compens ation

Master In

AGC Limiter

5K 10K

Slave O ut

90º

Line Out

Priority in put

100V

Vox Mix

Fault

NO

NC

Supervis ion

On

Off

Phantom

On Off

Mic Line

Phantom

On

Off Mic

Line

Line fuse

Out Loop

: 230V 3

Com

A

115V

230V s delive red

V

PLN-1LA10

Loop Amplifier

Fault

90º

Line

Out

Fault

NO

C

NC

NO C NC

figure 4.6: Line output, connection

NC

COM

NO

figure 4.5: Fault output, relay

The fault output is an internal relay. By default, NC is connected to

COM

. When a supervised function of the loop amplifier fails, the relay connects NO to COM .

table 4.4: Fault output, details

Number of connections:

1x screw terminal

Location:

Rear side

Contacts:

Voltage-free, max. 100 V, 2 A

Signal-to-noise ratio:

63 dB @ max. volume

75 dB @ min. volume/mute

Headroom:

25 dB

table 4.5: Line output, details

Number of connections:

1x XLR plug

Location:

Rear side

Nominal level:

1 V

Impedance:

200

To connect the loop amplifier to a mains power supply do as follows:

1 Set the voltage selector on the rear of the loop amplifier to the correct position (refer to table 4.6).

table 4.6: Voltage selector

Power supply voltage

100 to 120 V(AC)

220 to 240 V(AC)

Voltage selector

115

230

Note

The PLN-1LA10 Loop Amplifier is delivered with the voltage selector in the 230 position.

Bosch Security Systems | 2007-08 | 9922 141 50672en

Plena Loop Amplifier | Installation and User Instructions | External Connections

2 Make sure that the fuse holder in the rear of the loop

amplifier contains the correct fuse (refer to table 4.7).

table 4.7: Fuses

Voltage selector

115

230

Fuse

10AT

6.3AT

Note

The PLN-1LA10 Loop Amplifier is delivered with a 6.3AT fuse.

3 Connect a locally approved power cable from the loop amplifier to a power outlet (refer to figure 4.7).

Master In

Master in

Slave out

Slave Out

90º

Priority inp ut

Line Out

AGC

Limiter 5K 10K

100V 0

Vox

Mix

Fault

NO

C NC

Supervisi on

2

On Off

Phantom

On

Off

Mic Line

Phantom

On Off Mic

Line

Line fuse:

230V 3A

115V 6A

Out Co m

115V

Apparatus

230V d for 230

V

PLN-1LA10

Loop Amplifier

Line fuse:

115V 6A

Loop

Out

Com

115V

230V

Apparatus delivered

V

figure 4.7: Power supply, connection table 4.8: Power supply, details

Mains voltage:

230/115 V(AC), ±10%, 50/60 Hz

Power consumption: max. 400 W

Mains inrush current: max. 7 A @ 230 V(AC), max. 14 A @ 115 V(AC)

Signal-to-noise ratio:

63 dB @ max. volume

75 dB @ min. volume/mute

Headroom:

25 dB

Bosch Security Systems | 2007-08 | 9922 141 50672en en | 24

Plena Loop Amplifier | Installation and User Instructions | External Connections en | 25

4.7 Slave to Master

Connect the

0° Slave Out

socket or

90° Slave Out

of the master loop amplifier to the Master in socket of the slave loop amplifier. For an example, refer to the connection from Master to Slave 2 in figure 4.8 and the connection from Master to Slave 1 in figure 4.8.

4.8 Slave slave

Connect the

0° Slave Out

socket of the slave loop amplifier to the Master in socket of the next slave loop amplifier. For an example, refer to the connections from

Slave 1 to Slave 3 and Slave 2 to Slave 4 in figure 4.8.

Master In

VU LED

PRE Amp

. POST Am p.

Slave Out

Master Sla ve

Priority input

AGC

Limiter

5K 10K

100V 0

Vox

Mix

Line Out

Fault

NO C

NC

Supervisio n

On

2

Off

Phantom

On

Off

Mic

Line

Phantom

On

Off Mic

Line

Line fuse:

Loop

Out Com

115V

230V

Apparat

Connec ted for 23

0V

Master

Slave 2

Metal loss ation

Master

In

VU LED

PRE Amp.

POST Amp

.

Slave

Out

Master

Slave

Priority input

90º

Line O

AGC

Limiter

5K 10K

Master In

VU LED

PRE Amp

. POST Amp

.

Slave

Out

Master Sla ve

Priority inp ut

90º

AGC

Limiter

5K 10K

Line O

Metal los s ation

Master In

VU LED

PRE Amp

. POST Amp

.

Slave Out

Master Sla ve

Priority input

90º

Line O

AGC

Limiter

5K 10K compensa tion

Master In

VU LED

PRE Amp

. POST Amp

Slave Out

Master Sla ve

Priority inp ut

90º

AGC Limiter

5K 10K

Line Ou

100V 0

Vox

Mix

Fault

NO

C NC

Phantom

On

Off Mic

Line

Supervision

On

Off

Phantom

On Off Mic

Line

Line fuse:

230V 3A

Loop

Out Com

115V

Connecte

230V d for 230V

Slave 4

Metal los s ation

Master

In

VU LED

PRE Amp

. POST Amp

.

Slave Out

Master Sla ve

Priority inp ut

90º

AGC

Limiter

5K 10K

Line O compensa tion

Master In

VU LED Slave Out

PRE Amp . POST Amp

Master Sla ve

Priority inp ut

90º

AGC

Limiter 5K 10K

Line Ou

100V 0

Vox

Mix

Fault

NO

C NC

On

2

Off

Phantom

On

Off

Mic Line

Phantom

On Off Mic

Line

Line fuse:

230V 3A

115V 6A

Loop

Out Com

115V

Connecte

230V d for 230V

figure 4.8: Master and slave loop amplifiers

Master

In

VU LED

PRE Amp

. POST Amp

.

Slave Out

Master Sla ve

Priority input

90º

Line O

AGC

Limiter

5K 10K

Slave 1

compensa tion

Master In

VU LED

PRE Amp.

POST Am

Slave Out

Master Sla ve

Priority inp ut

90º

AGC Limiter

5K 10K

100V

Line Ou

Vox

Mix

Fault

NO

C NC

Phantom

On

Off Mic

Line

Supervisio

On

Off

Phantom

On

Off Mic

Line

Line fuse:

115V 6A

115V

Apparatus

Connecte

230V

Slave 3

compensa tion

Master In

VU LED Slave Out

PRE Amp.

POST Am

Master Sla ve

Priority inp ut

90º

AGC

Limiter 5K 10K

Line Ou

100V

Vox

Mix

Fault

NO

C NC

Supervision

2

On Off

Phantom

On

Off

Mic Line

Phantom

On Off Mic

Line

Line fuse:

230V 3A

115V 6A

Loop

Out Com

115V

230V

Apparatus delivered

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Plena Loop Amplifier | Installation and User Instructions | External Connections

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en | 26

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Plena Loop Amplifier | Installation and User Instructions | Configuration en | 27

5 Configuration

Set the Master in / Slave out switches on the rear of all loop amplifiers (refer to figure 5.1) in the induction loop system in the correct position.

• The Master/Slave switch of the master loop amplifier must be in the

Master position.

• The Master/Slave switch of all slave loop amplifiers must be in the Slave position.

Master In

VU LED

PRE Amp. POST Amp.

Slave Out

Master Slave

figure 5.1: Master/Slave switch

90º

Note

Slave loop amplifier can only send the signal that they receive from the master loop amplifier to their induction loops. The audio inputs and the priority input of the slave loop amplifiers are disabled.

5.2.1

Master induction loops

Do as follows:

1 Connect a pink noise source to audio input 2 on the rear of the master loop amplifier.

2 Connect the master loop amplifier to the mains power supply with a power cable.

3 Set the

AGC

/

Limiter

switch on the rear of the master loop amplifier in the Limiter position.

4 Switch on the pink noise source.

5 Set the signal strength of the output signal of the pink noise source to 0 dBV.

6 Switch on the master loop amplifier with the power switch on the front.

7 Increase the volume of audio input 2 of the master loop amplifier with its input volume control until the

Limiter LED on the front of the master loop amplifier comes on.

8 Increase the electric current through the master induction loops with the Master volume control on the front of the master loop amplifier until the magnetic field strength in each master induction loop is 100 mA/m.

Note

Instead of a pink noise source, you can use a sine wave of 1 kHz. Then, the magnetic field strength must be 70 mA/m in each master induction loop.

9 Switch off the master loop amplifier with the power switch on the front.

10 When the induction loop system contains slave loop amplifiers, configure the electric current through the

slave induction loops (refer to section 5.2.2).

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Plena Loop Amplifier | Installation and User Instructions | Configuration en | 28

5.2.2

Slave induction loops

Do as follows:

11 Disconnect the master induction loops from the master loop amplifier.

12 Connect the slave loop amplifier to the mains power supply with a power cable.

13 Set the

AGC

/

Limiter

switch on the rear of the slave loop amplifier in the Limiter position.

14 Switch on the master loop amplifier with the power switch on the front of the master loop amplifier.

15 Switch on the slave loop amplifier with the power switch on the front of the slave loop amplifier. When the induction loop system contains more than one slave loop amplifier, make sure that all other slave loop amplifiers are off.

16 Increase the volume of audio input 2 of the slave loop amplifier with its volume control until the

Limiter LED on the front of the slave loop amplifier comes on.

17 Increase the electric current through the slave induction loops with the Master volume control on the front of the slave loop amplifier until the magnetic field strength in each slave induction loop is 100 mA/m (pink noise source) or 70 mA/m (sine wave of 1 kHz).

18 Switch off the slave loop amplifier with the power switch on the front of the slave loop amplifier.

19 Repeat the procedure for the other slave loop amplifier in the induction loop system.

Note

Do not forget to re-connect all induction loops after you have configured the electric current through the induction loop of the last loop amplifier.

5.2.3

Bracket

You can cover the front of the loop amplifier with a

bracket (refer to figure 5.2). When you cover the front,

you make sure that nobody can change the position of the volume controls. Thus, you make sure that nobody can change the electric current through the induction loop that is connected to the loop amplifier.

figure 5.2: Cover bracket

5.3

0 dB

-6 dB

-20 dB

Power

1

2

+

+

Master

1

5

Current

10

Fault

AGC

Limiter

Metal loss compensation

Do as follows:

1 Turn the Metal loss compensation control on the rear of the loop amplifier to the leftmost position.

2 Connect headphones to the headphones socket on the front of the loop amplifier to listen to the audio signal that is sent to the connected induction loops.

3 With the same headphones, listen to the audio signal on the induction loops through an induction loop receiver.

4 Turn the

Metal loss compensation

control to adjust the tone of the audio signal on the induction loops.

5 Repeat the procedure for the other loop amplifiers in the induction loop system.

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Plena Loop Amplifier | Installation and User Instructions | Configuration en | 29

5.4 Supervision

You can switch supervision (refer to section 1.5) on and

off with the Supervision switch. The Supervision switch is on the rear of the loop amplifier (refer to figure 5.3).

• To switch on supervision, set the Supervision switch in the ON position.

• To switch off supervision, set the

Supervision

switch in the OFF position.

5.7 AGC/Limiter

5.7.1

Introduction

Automatic gain control (AGC) keeps the level of the audio signal on the connected induction loops constant.

The limiter makes sure that audio signals with a strength of more than 0 dBV are not sent to the connected induction loops.

Fault

NO C NC

Supervision

On Off

5.7.2

Switch on and off

You can switch automatic gain control (AGC) on and off with the

AGC

/

Limiter

switch. The

AGC/Limiter switch is on the rear of the loop amplifier (refer to

figure 5.5).

• To switch on AGC, set the AGC / Limiter switch in the

AGC position. When AGC is on, the limiter is disabled.

figure 5.3: Supervision switch

You can configure the fault contact with the Supervision

switch (refer to section 5.4).

• If supervision is off, the internal relay is de-energized

(NO position).

• If supervision is on and the loop amplifier operates correctly, the internal relay is energized

(NC position).

• If supervision is on and the loop amplifier does not operate correctly, the internal relay is de-energized

(NO position).

Note

Do not forget to configure the AGC range (refer

to section 5.7.3).

• To switch on the limiter, set the AGC / Limiter switch in the

Limiter

position. When the limiter is on, AGC is disabled.

AGC Limiter 5K 10K

You can set the volume of the audio signal that the priority input sends to the connected induction loops with the Priority input volume control. The Priority input volume control is on the rear of the loop amplifier (refer to figure 5.4).

AGC

figure 5.5: AGC/Limiter switch

Priority input

AGC

AGC Limiter 5K 10K

100V 0

figure 5.4: Priority input volume control

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Plena Loop Amplifier | Installation and User Instructions | Configuration en | 30

5.7.3

Range

You can set the AGC range with the

AGC

volume control. The AGC volume control is on the rear of the loop amplifier (refer to figure 5.6).

AGC

AGC Limiter 5K 10K

5.9.1

Sensitivity

You can set the sensitivity of the audio inputs with the

Mic/Line switch. The Mic/Line switch is on the rear of

the loop amplifier (refer to figure 5.8).

• If the connected audio source is a microphone, set the switch in the Mic position.

• If the connected audio source is a line-level source, set the switch in the Line position.

figure 5.6: AGC volume control

The correct AGC range depends on the audio input signals and the perceptions of the users of the connected induction loops. If you set the AGC range too wide, soft sounds (for example, undesired ambient noise) is amplified. If you set the AGC range too narrow, desired soft sounds are lost.

Phantom

Vox Mix

figure 5.8: Mix/Line switch

On Off Mic Line

You can set the frequency range with the

5K/10K

switch.

The

5K/10K

switch is on the rear of the loop amplifier

(refer to figure 5.7).

• If the audio inputs contain speech, set the switch in the 5K position for the most optimal result.

• If the audio inputs contain background music, set the switch is in the 10K position for the most optimal result.

5.9.2

Phantom power

You can switch phantom power for microphones on and off with the Phantom power switch. The Phantom power switch is on the rear of the loop amplifier (refer to

figure 5.9).

• If the connected audio source is a microphone that must receive phantom power, set the

Phantom

switch in the ON position.

• If the connected audio source is not a microphone or if the connected microphone does not accept phantom power, set the Phantom switch in the OFF position.

AGC

AGC Limiter 5K 10K

figure 5.7: Frequency range switch

Phantom

Vox Mix

figure 5.9: Phantom switch

On Off Mic Line

Bosch Security Systems | 2007-08 | 9922 141 50672en

Plena Loop Amplifier | Installation and User Instructions | Configuration

5.9.3

Voice activation

You can switch voice activation (Vox) of audio input 1 on and off with the Vox/Mix switch. The Vox/Mix switch

is on the rear of the loop amplifier (refer to figure 5.10).

• To switch Vox on, set the

Vox/Mix

switch in the

Vox position. The audio signal of audio input 1 overrides the audio signal of audio input 2.

• To switch Vox off, set the Vox/Mix switch in the Mix position. The audio signal of audio input 1 and the audio signal of audio input 2 are mixed.

Phantom

Vox Mix

figure 5.10: Vox/Mix switch

On Off Mic Line en | 31

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Plena Loop Amplifier | Installation and User Instructions | Operation en | 33

6 Operation

Push the Power switch to switch on the loop amplifier.

The Power switch is on the front of the loop amplifier

(refer to figure 6.1).

You can change the volume of the audio signal on the connected induction loops with the input volume controls. The input volume controls are on the front of the loop amplifier (refer to figure 6.3).

0 dB

-6 dB

-20 dB

Power

1 2

Caution

Do not change the volume of the audio signal on the connected induction loops with the Master volume control. When you change the position of the Master volume control, you change the magnetic field of the connected induction loops.

figure 6.1: Power switch

0 0

When the mains power supply is available, the green power LED on the front of the loop amplifier (refer to

figure 6.2) comes on.

0 dB

-6 dB

-20 dB

Power

1

0

figure 6.3: Input volume controls

0

2

0 dB

-6 dB

-20 dB

Power

figure 6.2: Power LED

0

1

0

2

Note

The volume of the audio signal on the priority input is configured with a volume control on the

rear of the loop amplifier (refer to section 5.6).

Push the Power switch to switch off the loop amplifier.

The Power switch is on the front of the loop amplifier

(refer to figure 6.1). The green power LED on the front

of the loop amplifier (refer to figure 6.2) goes off.

Bosch Security Systems | 2007-08 | 9922 141 50672en

Plena Loop Amplifier | Installation and User Instructions | Operation

You can change the tone of the audio signal on the connected induction loops with the tone controls. The tone controls are on the front of the loop amplifier (refer

to figure 6.4).

• The left tone control changes the bass or low frequency content of the audio signal.

• The right tone control changes the treble or high frequency content of the audio signal.

en

_

+

_

+

figure 6.4: Tone controls

Master

0

table 6.1: Status indicators

Indicator

Fault

Loop integrity

AGC

Limiter

Description

The loop amplifier does not operate correctly.

The induction loops are not intact.

The automatic gain control is on.

The signal of one or more of the inputs is clipped off because it is too strong.

Recommended action

Contact your dealer when the LED goes off.

Contact your dealer when the LED goes off.

----

Check which input is too loud and turn its volume control counterclockwise to decrease the volume.

Additional information

Refer to section 5.5.

----

Refer to section 5.7.

Refer to section 5.7.

| 34

Bosch Security Systems | 2007-08 | 9922 141 50672en

For more information visit www.boschsecuritysystems.com

© Bosch Security Systems B.V.

Data subject to change without notice

2007-08 | 9922 141 50672en

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