Bosch PLN-1LA10 User Manual
Plena Loop Amplifier
Installation and User Instructions
PLN-1LA10en
Plena Loop Amplifier | Installation and User Instructions | Important safeguards en | 3
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.
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Plena Loop Amplifier | Installation and User Instructions | Acknowledgements en | 4
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.
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Plena Loop Amplifier | Installation and User Instructions | About this manual en | 5
About this manual
Function
The Installation and User Instructions gives the
installers and operators the necessary data to install,
configure and operate the Plena Loop Amplifier.
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.
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.
• War ning
If you do not obey the warning, you can cause
personal injury or death.
Signs
The Installation and User Instructions shows each
precaution with a sign. The sign shows the effect if you
do not obey the instruction.
Precaution
General sign for cautions and warnings.
Precaution
Risk of electric shock.
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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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 = 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: 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
9
---
°F
°C
°C 32+⋅=
5
5
---
°F 32–()⋅=
9
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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
1.1 Loop amplifier
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.
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
1.2 Induction loop systems
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.
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
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12 3 5
figure 1.2: Assistive listening device
table 1.3: Assistive listening device
No. Description
1 Tele-coil
2 Microphone
3 Gain control
4 Amplifier
5 Earphone
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1.2. 3 Benefit s
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.
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.
1.4 Block diagram
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.
1.6 Quadrature system
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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Plena Loop Amplifier | Installation and User Instructions | System overview en | 11
1 2
0dB
-6 dB
-20 dB
Power
1
0
2 Master
0
_
_
+
+
0
11 8 7 6 5 410 9
Metal loss
compensation
AGC
Master In
AGC
Limiter
2425
Slave Out
VU LED
PRE Amp. POST Amp.
Master Slave
Priority input
5K 10K
231422
Line Out
0º
90º
12
0
100 V
Vox Mix On Off
Fault
Supervision
NOCNC
On Off
Phantom Phantom
Mic Line On Off
1510
Current
Loop
Integrity
Mic Line
AGC Limiter
Line fuse: 230V 3A
Out Com
3
Fault
181712 15 1613
230V115V
Apparatus delivered
Connected for 230V
115V 6 A
Loop
192021
figure 1.3: Front and rear views
Priority
100 V
input
0
Phantom
Bal. input
Mic
1
Line
Bal. input
Mic
2
Line
figure 1.4: Block diagram
Vox Mix
Mute
Tone
Priority
control
Limiter
0º
90º
Master in
Slave out
90º 0º
Master
Out
Com
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