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
Plena Power Amplifiers Table of Contents | en 3
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
4 en | Safety Plena Power Amplifiers
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
Plena Power Amplifiers About this manual | en 5
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
6 en | About this manual Plena Power Amplifiers
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
Plena Power Amplifiers System Overview | en 7
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.
4
8 en | Installation Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Connection and indicators
Front panel indicators
0 dB
-6 dB
-20 dB
taehrevOyrettaB MainsPilot-Tone
Status
1 2 3 4 5 6
Figure 5.1: LBB 1930/20 LBB 1935/20 and LBB 1938/20
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.
Rear panel connectors and switches
Priority Only No Priority
100V 0 1 00V 0
Priority ControlledOutput
OOn
24V DCIn
Apparatusdelivered
connectoredfor 230V~
Main Power
BatteryInput
Fault Relays' Output
NOCOM NC
OOn
NOCOM NC NOCOM NC
Input1Pr iority
Loopthrough1
Input2Pr ogram
Loopthrough2
Input1Pr iority
2...24V-I nput1
0V-Input 2
Input2Ena ble
2..24V-Enable
0V-Mute
100V
0
SlaveI nput100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection( 12A)
PriorityOnly
0
0
NoPriority
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Ratedinput
Power: 1600VA
Inpu t1
Prio rity
Slave Inpu t
100V
Inpu t2
Enab le
100V 0
100V 70 V0 0 8
Dire ct Out put
Inpu tInpu t
Inpu t 2-Prog ramInpu t 1-Prio rity
2..24V
Defaul tO
GND 2..24V
Defaul tOn
GND
20 19 18 17 16 1415 13
1 2 3 5 64 7 8 9
12
11
10
Figure 5.2: LBB 1930/20 LBB 1935/20
5
5.1
5.2
Plena Power Amplifiers Connection and indicators | en 9
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Apparatus
delivered
connectored
for 230V~
Input 1Priori ty
Loopthro ugh1
Input 2Progra m
Loopthro ugh2
Input 1Priori ty
2...24V- Input 1
0V-I nput2
Input 2Enable
2..24V- Enable
0V-M ute
100V
0
Slave Input10 0V
+
+
-
-
Rated input
Power : 1600VA
OOn
Main Power
BatteryInput
Fault Relays' Output
NOCOM NC
OOn
NOCOM NC NOCOM NC
Battery
Detection
Pilot-tone
Detector
Inpu tInpu t
Inpu t Out put
Inpu t 2-Prog r
Powe r
amInpu t 1-Pri ority
Inpu t1
Prio rity
Slave Inpu t
100V
Inpu t2
Enab le
100V 0
2..24V
Defaul tO
GND 2..24V
Defaul tOn
GND
24V DCIn
Priority Only No Priority
100V 100V 0V0V
Priority ControlledOutput
100V 70V0 0 8
Dire ct Out put
100V
0
70V
0
8ohm
100V/70V
Selection (12A)
Priority Only
0
0
NoPri ority
Priority
F701
F702
141517181920 16
1 2 3 5 64
7
9
12
11
10
8
Figure 5.3: LBB 1938/x0
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. Voltageselector (Not on LBB 1938/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
10
en | Connection and indicators Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Internal setting
The output voltage of the priority controlled loudspeaker outputs can be set to 70V or 100V. A
high power fuse inside the unit is used as a voltage selector. Insert the high power fuse into
fuse holder F701 for 100V selection (default setting), or into fuse holder F702 for 70V
selection. This selection does not affect the output voltage of the loudspeaker direct outputs.
F701 100V
70V
F702
Figure 5.4: Internal fuse setting LBB 1930/20, LBB 1935/20, LBB 1938/x0
See also
– Rear panel connectors and switches, page 9
5.3
Plena Power Amplifiers Connection and indicators | en 11
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
External connections
Connect the back-up power supply
The power amplifier has a 24VDC input (8) screw terminal to connect a back-up power supply.
You must connect an earth (9) to the unit to increase the electrical stability of the system.
1
00V 0 10
0V 0
Prio
rityC
ont
ro
l
ledO
u
tp
ut
24V
D
C
In
Appara
tus
delivered
connectoredf
or230V
~
M
ainP
ower
B
atter
yt
ela
y
s'O
utput
NC
Of
f
O
n
NO
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OM
NC
NO
C
O
M
NC
1
0
0V
0
7
0V
0
8
ohm
1
00V/7
0V
S
el
ection
(12A
)
Priori
t
y
O
nl
y
0
0
N
o
P
r
ior
i
t
y
P
riority
0
7F
1
F
2
0
7
Batter
y
Pow
e
r
Detection
23
0V~
240
V~
Ratedinpu
t
Power: 160 0VA
100V
70V
0 0
8
Dire c
tO
utput
1
00V 0 1 0
0V 0
PriorityC
o
n
tr
olledOutput
O
O
n
2
4VD
C
In
Ap
p
aratusdeliver
ed
c
onn
ecto
re
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V
~
MainP
ower
Batter
yIn
put
Fault
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e
l
ays'Output
NO
CO
MN
C
OffO
n
N
O
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O
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NC
N
O
CO
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N
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I
n
p
ut1Pr
iority
Lo
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h
rough1
In
put
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Pr
ogram
L
oopt
h
rou
gh
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Input
1
P
ri
o
r
ity
2...24VI
nput1
0
V-I
n
pu
t
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I
np
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t
e
100
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0
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Input100V
+
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-
-
1
00V
0
7
0V
0
8
o
hm
10
0
V/
70
V
Selecti
on(12A)
Prio
r
i
tyOnly
0
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N
o
Pr
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Pri
o
rity
F7
0
1
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702
B
a
tte
ry
P
ower
Detection
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D
etector
230V~
240V~
Ratedinput
Power:1600V
A
I
np
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P
r
io
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ity
Sla
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100
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En
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1
00V 0
100
V 7
0
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0
8
DirectO
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I
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ramInput1-P riority
2..24
V
D
e
f
aultOff
G
N
D
2
.
.
24
V
DefaultOn
GN
D
12 VDC
12 VDC
- +
+
Figure 6.1: Back‑up power supply
Connecting line input and loop-through
The power amplifier has a balanced line input for connection to a pre‑amplifier or a mixer. Use
the loop‑through connection to connect the power amplifier to another power amplifier if
more power is needed. Each power amplifier must be connected to its own set of
loudspeakers. Do not connect power outputs to each other.
Use program line input 2 (4) and line loop‑through 2 (6) for normal operation without priority.
100V
0 1
0
0V 0
P
r
i
or
i
t
y
Cont
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n
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23
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'
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NO
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O
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L
oo
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0
AL
250V
A
ppa
ratusdeli
v
er
e
d
conne
ctedfor230V -
T
h
i
sapparatusm
u
s
t
be
e
arthed
W
ar
n
i
ng
MasterOut
14
3
5
T
r
igger1
Tel
/EM
G
0
Ou
t
C
allIn
C
a
l
l
A
ctiv
e
Zone
6
Zone5
Zone1
C
D
L
R
Tri
g
g
er2
PC
A
ud
i
oIn
1.Audio+
2.0V
3.Aud
io
-
4.24Vd.c
.
5.A
l
lcal
l
6.Da
ta-
7.Da
t
a+
8.
Chs
.
GND
RS232
/Li
ne
/L
in
e
Aux
3
5
4
1
2
3
7
6
8
5
4
1
2
2
1
+
-
GND
3
1
2
+
-
GND
3
Zone2
Zon
e
3
Zon
e
4
DCOut
DCIn
100V
100V
0
0
100V
0
100V
0
100V
100V0
0
100V
100V0
0
4
6
Figure 6.2: Line input and loop‑through
6
6.1
6.2
12 en | External connections Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
100V slave input
The power amplifiers have a 100V slave input (18) that can be connected to an existing 100V
loudspeaker line. In this way it is easy to connect an additional power amplifier on a remote
location for more output power. The 100V input is not affected by the control terminals for
input 1 priority (20) or input 2 enable (19).
Priority Only No Priority
100V 0 100V 0
Priority ControlledOutput
OOn
24V DCIn
Apparatus delivered
connectored for230V~
Main Power
BatteryInput
Fault Relays' Output
NOCOM NC
OOn
NOCOM NC NOCOM NC
Input1P riority
Loopthrough1
Input2P rogram
Loopthrough2
Input1P riority
2...24V-I nput1
0V-Input 2
Input2Ena ble
2..24V-Ena ble
0V-Mute
100V
0
Slave Input100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection( 12A)
PriorityOnly
0
0
NoPriority
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design& Quality
TheNetherlands
LBB1938/10
NL-4827HG-10
Plena480W PowerAmplier
Max.output power720W
Ratedoutput power180W
230V~,50/60Hz
S/N.
8900193 81001
A035413
Madein China
N663
Ratedinput
Power: 1600VA
Inp ut1
P riority
S lave In put
10 0V
Inp ut2
E nabl e
100 V 0
10 0V 70 V0 0 8
Dir ect Ou tput
Inp utInp ut
Inp ut 2-P rogr amInp ut 1-P rio rity
2.. 24V
Def ault O
GND 2. .24V
Def ault On
GND
100 V 0
2.. 24V
Def ault O
GND 2. .24V
Def ault On
GND
Figure 6.3: 100 V slave input
Notice!
If the 100V slave input is used, and the 0V and 100V are incorrectly connected, no pilot tone
is detected on the power amplifier. Refer to section Input pilot tone, page 16, for more
information.
Constant voltage loudspeakers
The power amplifier can drive 100V constant voltage loudspeakers at full power (100V) or half
power (70V). Connect the loudspeakers in parallel and check the loudspeaker polarity for inphase connection. The summed loudspeaker power should not exceed the rated amplifier
power.
6.3
6.4
Plena Power Amplifiers External connections | en 13
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Low impedance loudspeakers
Connect low impedance loudspeakers to the 8 ohm/0 terminals. This output can deliver the
rated output power into an 8 ohm load. Connect multiple loudspeakers in a series/parallelarrangement to make the combined impedance 8 ohm or higher. Check the loudspeaker
polarity for in‑phase connection.
1
0
0
V 0
1
00V 0
Pri
or
it
yCon
t
r
ol
l
e
dOutpu
t
Off On
2
4V D
C
I
n
Ap
pa
ra
t
usdeli
ve
red
c
o
nne
c
tore
dfor2
3
0
V
~
Mai
n
P
owe
r
B
atteryInput
F
au
ltRela
y
s
'Outp
ut
NO
C
OMNC
O
f
f On
NO
C
O
M
N
C
N
O
CO
M
N
C
In
p
u
t
1P
riori
t
y
Loopthr
o
u
gh1
Input2
P
rogram
Lo
opthrou
gh2
Input1P
riority
2...24V-Inpu
t
1
0V-
Input2
Inpu
t
2Enable
2.
.24
V
Enabl
e
0
V-
M
ute
100
V
0
S
l
aveInp
ut
1
0
0
V
+
+
-
-
1
0
0V
0
70
V
0
8o
hm
1
00
V/
7
0V
Sel
e
ction
(
1
2
A
)
Pr
i
o
r
it
yOnly
0
0
N
oPr
iorit
y
P
rior
ity
F7
0
1
F7
0
2
B
at
te
ry
P
o
w
e
r
Det
e
ction
Pi
l
ot-to
ne
De
te
c
tor
2
3
0
V~
240
V~
Design&Qualit
y
T
he
N
eth
erlands
L
B
B19
3
8
/
10
NL-4827HG-10
Plena4
8
0
WP
ow
e
rAmpli
er
Max.o
utp
u
tp
ow
er7
20W
Rat
edoutputpow
er
1
80
W
2
3
0V~,50/6
0Hz
S
/N
.
8900193
8
1
00
1
A035413
M
ad
e
i
nChina
N663
R
at
e
d
input
P
owe
r
:1600V A
Input
1
P
r
i
ori
ty
Slave In
put
100V
I
n
put2
E
nab
l
e
100V 0
100V
70V0 0 8
D
ir
ectO
u
t
pu
t
In
p
ut
Inp
ut
Inpu
t
2
P
rogramInpu
t
1-
Pr
io
r
it
y
2
..24V
De
f
au
lt
O
ff
GN
D2.
.
24V
Default
O
n
GND
Priority Only No Priority
100V 0 100V 0
Priority Controlled Output
24V DCIn
10 0V 70 V0 0 8
Di re ct O utp ut
Priority Only
No Priority
70 V100 V
8 Ohm
8 Ohm
8 Ohm
8 Ohm
8 Ohm
8 Ohm
4 Ohm
4 Ohm
Figure 6.4: Priority input and control terminals
6.5
14 en | External connections Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Priority controlled loudspeaker
Loudspeakers connected to the Priority Only output will receive only audio signals with
priority, like calls from a call station.
Loudspeakers connected to the No Priority output will receive all audio signals, such as music,
but no signals with priority, like calls.
Power
Use the mains lead to connect the amplifier to the power supply.
1
00V 0
1
0
0V 0
Prio
ri
tyC
o
n
trolledOutput
2
4V
D
C
In
Appara
tusdeliv
ered
connectored
for23
0
V~
Main
P
ower
B
attery
t
O
O
n
NO
C
OM
NC
NO
C
O
M
N
C
100V
0
70V
0
8
o
h
m
100V/
7
0V
Se
l
e
ctio
n(12A)
Prio
rity
Only
0
0
No
Prio
ri
ty
P
ri
ority
F701
F702
Batter
y
Power
Det
ecti
o
n
23
0V
~
240
V~
Ratedinput
Pow 1:re 600VA
100 V
70V
0
0
8
Dire c
tO
utput
100V 0 1 00V 0
PriorityC
on
t
r
o
lledOu
tput
O
O
n
2
4VD
CI
n
A
p
p
ara
tusd
el
ivered
co
nnecto
re
d
fo
r230V~
Ma
i
nP
ower
B
atter
y
Input
F
au
ltRel
ays'Out
put
NO
C
O
M
NC
O
O
n
NOCO
M
NC
NOC
O
MNC
I
np
ut1Pri
ority
Lo
o
pth
r
ou
gh1
Inp
ut2Pr
ogram
L
o
o
pthroug
h2
Input1Priori
ty
2
.
.
.2
4V-
I
n
p
ut
1
0V-Input2
I
nput
2
Enab
le
2
.
.24V-Enable
0V-Mute
1
00
V
0
Sla
v
e
Inp
ut100V
+
+
-
-
1
0
0
V
0
70V
0
8ohm
100V/
7
0V
Selection
(12A)
P
r
iorit
y
Onl
y
0
0
NoPrio
r
i
ty
Priority
F701
F
70
2
Battery
Power
Dete
cti
o
n
Pilot-tone
Detector
230V~
24
0V~
Desig
n&Qua
lity
T
heNether
l
ands
L
B
B
1
93
8/
10
NL
-4
8
2
7
H
G
-
1
0
Pl
e
n
a
480WPowerAmplifier
M
ax
.o
u
tp
u
tpowe
r
72
0W
R
a
t
edoutp
utp
o
wer180W
230V~,
5
0/60Hz
S/N.
8
90019
381
00
1
A
0
35
413
Mad
e
i
nC
h
i
na
N66
3
Ra
tedinput
Pow
e
r:
1
6
0
0
V
A
Input1
Pr
iori
t
y
Sla
veI
nput
1
00
V
Inpu
t2
Enab
l
e
1
0
0V 0
100V 70V0
0
8
D
irectO
utput
Inp
utInput
I
n
pu
t2
Progr
a
m
Input1-P r
ior
ity
2
.
.24
V
Defau
l
t
Of
f
GND
2
..24V
Defau
l
t
On
GND
Linefuse
T10
L
2
5
0V
Figure 6.5: Mains lead
6.6
6.7
Plena Power Amplifiers External connections | en 15
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Supervision
Supervision is provided for:
– Pre‑amplifier and power amplifier function
– Battery and mains supervision
Relays are provided on the rear panel for the each supervised function and are normally
energized (fail‑safe). Each relay has 3 contacts, normally open, common and normally closed.
If an application does not need supervision, the indicators on the front panel can be set to
“OFF” with the switches next to each relay output. The relays always function and are
independent of the indicator switch setting.
Input pilot tone
The Plena Voice Alarm System uses a pilot tone of 20kHz at -20dBV to supervise the preamplifier, the connections between the pre‑amplifier and the power amplifier and function of
the power amplifier. If the input signal from the pre‑amplifier stops, the mains and battery fail,
or the power amplifier stops for any other reason, the pilot‑tone stops, the pilot‑tone fault
indication shows on the front panel and a signal is given on the Input fault relay. If the power
amplifier stops through overheat, then the overheat indicator shows on the front panel, the
signal is given on the Input fault relay.
The pilot‑tone detection indicator can be set to “ON” or “OFF” with the pilot‑tone detection
switch (17), see Rear panel connectors and switches, page 9. The pilot‑tone indicator on the
front panel is set to “OFF”, but the fault relay switch still functions.
Battery supervision
The power amplifier supervises the availability of the back‑up power supply.
If the battery supply fails the battery fault indication shows on the front panel and the battery
fault relay switches over.
The battery supervision indicator can be set to “ON” or “OFF” with the battery detection
switch (15), Rear panel connectors and switches, page 9. The battery indicator on the front
panel is set to “OFF”, but the fault relay switch still functions.
The amplifier will work between 20VDC and 26.5VDC. Below 20VDC the amplifier will shut
down if the mains is not present.
The amplifier will automatically switch from primary power (mains) to backup power (24VDC),
this changeover is automatic. During switch over a glitch can be heard in the audio signal,
typically this lasts less than 1 second, maximum 2 seconds duration.
Mains supervision
The power amplifier supervises the availability of the mains supply. If the mains supply fails
(falls below the threshold of -20%), and the back‑up power supply takes over, the fault relay
moves to the NOK position. A mains fault indication shows on the front panel and a fault state
is given by the mains fault relay.
7
7.1
7.2
7.3
16 en | Supervision Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Operation
Switch ON
Put the power switch on the rear of the power amplifier in the “I” position.
1
00V 0
1
0
0V 0
Prio
ri
tyC
o
n
trolledOutput
2
4V
D
C
In
Appara
tusdeliv
ered
connectored
for23
0
V~
Main
P
ower
B
attery
O
O
n
NO
C
OM
NC
NO
C
O
M
N
C
100V
0
70V
0
8
o
h
m
100V/
7
0V
Se
l
e
ctio
n(12A)
Prio
rity
Only
0
0
No
Prio
ri
ty
P
ri
ority
F701
F702
Batter
y
Power
Det
ecti
o
n
23
0V
~
240
V~
Ratedinput
Pow 1:re 600VA
100 V
70V
0
0
8
Dire c
tO
utput
100V 0 1 00V 0
PriorityC
on
t
r
o
lledOu
tput
O
O
n
2
4VD
CI
n
A
p
p
ara
tusd
el
ivered
co
nnecto
re
d
fo
r230V~
Ma
i
nP
ower
B
atter
y
Input
F
au
ltRel
ays'Out
put
NO
C
O
M
NC
O
O
n
NOCO
M
NC
NOC
O
MNC
I
np
ut1Pri
ority
Lo
o
pth
r
ou
gh1
Inp
ut2Pr
ogram
L
o
o
pthroug
h2
Input1Priori
ty
2
.
.
.2
4V-
I
n
p
ut
1
0V-Input2
I
nput
2
Enab
le
2
.
.24V-Enable
0V-Mute
1
00
V
0
Sla
v
e
Inp
ut100V
+
+
-
-
1
0
0
V
0
70V
0
8ohm
100V/
7
0V
Selection
(12A)
P
r
iorit
y
Onl
y
0
0
NoPrio
r
i
ty
Priority
F701
F
70
2
Battery
Power
Dete
cti
o
n
Pilot-tone
Detector
230V~
24
0V~
Desig
n&Qua
lity
T
heNether
l
ands
L
B
B
1
93
8/
10
NL
-4
8
2
7
H
G
-
1
0
Pl
e
n
a
480WPowerAmplifier
M
ax
.o
u
tp
u
tpowe
r
72
0W
R
a
t
edoutp
utp
o
wer180W
230V~,
5
0/60Hz
S/N.
8
90019
381
00
1
A
0
35
413
Mad
e
i
nC
h
i
na
N66
3
Ra
tedinput
Pow
e
r:
1
6
0
0
V
A
Input1
Pr
iori
t
y
Sla
veI
nput
1
00
V
Inpu
t2
Enab
l
e
1
0
0V 0
100V 70V0
0
8
D
irectO
utput
Inp
utInput
I
n
pu
t2
Progr
a
m
Input1-P r
ior
ity
2
.
.24
V
Defau
l
t
Of
f
GND
2
..24V
Defau
l
t
On
GND
Linefuse
T10
L
2
5
0V
Figure 8.1: Power switch and power connection
0 dB
-6 dB
-20 dB
taehrevOyrettaB MainsPilot-Tone
Status
1 2 3 4 5 6
Figure 8.2: LBB 1930/20 LBB 1935/20, LBB 1938/x0
If mains power or back‑up power is available, the VU‑bar (1) on the front of the power
amplifier is lit and shows the output level of the amplifier.
If the internal temperature reaches a critical limit due to poor ventilation or overload, an
overheat protection circuit switches “OFF” the power stage. The overheat indicator (5) shows
on the front panel and the Input fault relay switches over if the power stage is switched “OFF”
by the overheat protection circuit. The Battery operation indicator (3) lights up if the mains
power supply is failing and the back‑up battery is in use.
8
8.1
Plena Power Amplifiers Operation | en 17
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Connecting the priority input and using the control terminals
The power amplifier is provided with a balanced priority input (Input 1‑Priority) to connect to
a pre‑amplifier or mixer.
Refer to figure 5.2 and 5.3. Apply a control voltage of 2...24V to the input 1 priority control
terminals (20) to switch “ON” the priority input (1) and mute the program input (4). A local
music source can be connected to the program input and a remote emergency system to the
priority input. The emergency source must be able to supply the 2…24V control voltage to
override the local music source. The program input can be remotely controlled by using a
switch that is connected to the input 2 enable control terminals (19). Closing the switch
forces the input to <2V and disables the program input.
Application example of the use of the power amplifier control terminals
You can use up to 6 power amplifiers in combination with the Plena LBB1925/10 System
Pre‑amplifier to build a powerful multi-zone sound system. Zone switching of BGM and calls is
done via the LBB1925/10 zone relays in combination with the power amplifier control
terminals. The LBB1925/10 controls the background music by distributing 24VDC via the
music zone relays to the input 2 enable control terminals (19).The LBB1925/10 controls the
calls by distributing 24VDC via the call zone relays to the input 1 priority control terminals
(20). Each power amplifier serves one loudspeaker zone. Each zone can be “OFF”, or receive
music or a call.
PriorityOnly No Priority
100V 0 1 00V 0
PriorityControlled Output
OOn
24V DCIn
Apparatusdelivered
connectoredfor 230V~
MainPower
BatteryInput
FaultRelays' Output
NOCOMNC
OOn
NOCOMNC NOCOM NC
Input1Priority
Loopthrough1
Input2Program
Loopthrough2
Input1Priority
2...24V-Input1
0V-Input2
Input2Enable
2..24V-Enable
0V-Mute
100V
0
SlaveInput100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection(12A)
PriorityOnly
0
0
NoPriority
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design&Quality
TheNetherlands
LBB1938/10
NL-4827HG-10
Plena480WPower Amplier
Max.outputpower720W
Ratedoutputpower180W
230V~,50/60Hz
S/N.
890019381001
A035413
MadeinChina
N663
Ratedinput
Power: 1600VA
Input 1
Prior ity
Slave Input
100V
Input 2
Ena ble
100V 0
100V 70 V0 0 8
Direct Output
InputInput
Input 2-Prog ramInput 1-Pri ority
2..24 V
Default O
GND 2..2 4V
Default On
GND
PriorityOnly No Priority
100V 0 1 00V 0
PriorityControlled Output
OOn
24V DCIn
Apparatusdelivered
connectoredfor 230V~
MainPower
BatteryInput
FaultRelays' Output
NOCOMNC
OOn
NOCOMNC NOCOM NC
Input1Priority
Loopthrough1
Input2Program
Loopthrough2
Input1Priority
2...24V-Input1
0V-Input2
Input2Enable
2..24V-Enable
0V-Mute
100V
0
SlaveInput100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection(12A)
PriorityOnly
0
0
NoPriority
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design&Quality
TheNetherlands
LBB1938/10
NL-4827HG-10
Plena480WPower Amplier
Max.outputpower720W
Ratedoutputpower180W
230V~,50/60Hz
S/N.
890019381001
A035413
MadeinChina
N663
Ratedinput
Power: 1600VA
Input 1
Prior ity
Slave Input
100V
Input 2
Ena ble
100V 0
100V 70 V0 0 8
Direct Output
InputInput
Input 2-Prog ramInput 1-Pri ority
2..24 V
Default O
GND 2..2 4V
Default On
GND
3
Tel/EMG
0
L
R
1-
4 5
/Line
/Line
Trigger1 Trigger 2
PCAudoln
1.Audio+
2.0V
3.Audio-
4.24Vd.c.
5.Allcall
6.Data-
7.Data+
8.Chs.GND
RS232
xuADC
MasterOut Out
100V 0100V 0 100V 0 100V 0
100V
115V 230V
RatedInput
Power: 50VA
T0.5L250V
Apparatusdelivered
connectedfor 230V-
0 100V 0 100V 0 100V 0
+24V- +24V-
Thisapparatus mustbe earthed
Warning
3
786
1
5
2
4
3 1
5
2
4
LBB1925/10
8900192 51005
115/230V~,50/60Hz
No.
3
1
+
-
2
GND
3
2
+
-
1
GND
LBB1925/10
Figure 8.3: LBB1925/10 and power amplifier control terminals example
8.2
18 en | Operation Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Maintenance
The units require minimum maintenance, however to keep the units in good condition, the
following tasks should be carried out.
– Clean the units:
– Periodically clean the units with a damp, lint-free cloth.
– Clean the air inlets:
– The units can collect dust from the operation of the internal fans. The air inlets of the
units should therefore be cleaned on a yearly basis.
– Periodically check unit connections and grounding:
– To ensure that all cable connections to the units are secure.
– The ground (Protective Earth) connection of the system components.
!
Warning!
Dangerous mains voltages are present inside the units. Disconnect the main power supply
before doing any maintenance tasks.
9
Plena Power Amplifiers Maintenance | en 19
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Technical data
Electrical
Mains voltage
LBB 1930/20 LBB 1935/20 230 / 115 VAC , ± 10%, 50 – 60 Hz
LBB 1938/20 230 VAC, 50 – 60 Hz
LBB 1938/70 110 VAC, 50 – 60 Hz
Battery voltage
Battery voltage 24V DC, 20 - 26.5 V
Rated power
LBB 1930/20 400 VA
LBB 1935/20 960 VA
LBB 1938/x0 1600 VA
Performance
Signal performance
Frequency response 50 Hz - 20 kHz (+1/-3 dB @ -10 dB ref. rated
output)
Distortion <1% @ rated output, 1 kHz
Signal-to-Noise Ratios
LBB 1930/20 > 80 dB
LBB 1935/20 > 85 dB
LBB 1938/x0 > 90 dB
10
10.1
10.1.1
10.1.2
10.1.3
10.2
10.2.1
10.2.2
20 en | Technical data Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Line inputs
3 pin XLR balanced
Sensitivity 1 V
Impedance 20 kohm
CMRR > 40 dB (50 Hz - 20 kHz)
100V input, screw unbalanced
Sensitivity 100 V
Impedance 330 kohm
Loudspeaker outputs
Line loopthrough output (3 pin XLR balanced)
Nominal level 1 V
Impedance Direct connection to line input
Maximum rated output power - 70/100V output
LBB 1930/20 240 W
LBB 1935/20 240 W
LBB 1938/x0 480 W
8 Ohm outputs
LBB 1930/20 31 V / 120 W
LBB 1935/20 44 V / 240 W
LBB 1938/x0 62 V / 480 W
Power reduction@24 V battery operations
Reference rated power -1 dB (LBB 1935/20)
-2 dB (LBB 1930/20 LBB 1938/x0)
10.2.3
10.2.4
Plena Power Amplifiers Technical data | en 21
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Power consumption
Power (mains) LBB 1930/20 Unit
Full power 274 Watt
- 3 dB 193 Watt
- 6 dB 143** Watt
10V 41 Watt
Idle 18 Watt
Backup power
(24VDC)
Full power 7 Amp
- 3 dB 6 Amp
- 6 dB 4** Amp
10V 1 Amp
Idle 0.1 Amp
Full power 168 Watt
- 3 dB 144 Watt
- 6 dB 96 Watt
10V 24 Watt
Idle 2.4 Watt
Power (mains)
LBB 1935/20 LBB 1938/x0 Unit
Full power 451 987 Watt
- 3 dB 340 715 Watt
- 6 dB 244** 508** Watt
10V 55 113 Watt
Idle 16 25 Watt
Backup power
(24VDC)
Full power 12 32 Amp
- 3 dB 11 26 Amp
- 6 dB 8** 18** Amp
10V 2 4 Amp
Idle 0.3 1 Amp
Full power 288 768 Watt
10.2.5
22 en | Technical data Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Power (mains) LBB 1935/20 LBB 1938/x0 Unit
- 3 dB 264 624 Watt
- 6 dB 192 432 Watt
10V 48 96 Watt
Idle 7.2 24 Watt
* Output limited to -3dB
** Corresponds to pink noise and voice on full power
*** Output limited for sine wave signal to -3dB
Plena Power Amplifiers Technical data | en 23
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0
Mechanical specifications
Dimensions
Width 19”
Height (including feet) 2 Unit models: 100 mm
3 Unit models: 145 mm
Depth 2 Unit models: 250 mm
3 Unit models: 370 mm
19" Mounting brackets Included
Weight
LBB 1930/20
10.5 kg
LBB 1935/20 12.5 kg
LBB 1938/x0 25.0 kg
Environmental conditions
Operating temperature range -10 to +55°C
Storage temperature range -40 to +70°C
Relative humidity < 95%
EMC emission According to EN55103‑1
EMC immunity According to EN55103‑2
Acoustic noise level of fan < 45 dB SPL @ 1m at maximum speed
10.3
10.4
24 en | Technical data Plena Power Amplifiers
2014.01 | V1.1 | LBB193x/x0 Installation and Operation manual Bosch Security Systems B.V.
Bosch Security Systems B.V.
Torenallee 49
5617 BA Eindhoven
The Netherlands
www.boschsecurity.com
© Bosch Security Systems B.V., 2014
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