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Plena Power Amplifier | Installation and User Instructions | Amplifiers
3.5.3
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 another
pre-amplifier or mixer.
Apply a control voltage of 2...24 V 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...24 V
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).
Input 1
P riority
LBB 1 938/10
8900 193 81001
Plena 480W P ower Amplifier
Max. output power 720W
Rated output power 180W
A035413
230V~,50/60Hz
N663
S/N.
NL-4827HG-10
Design & Quality
The Netherlands
Input 1 Priority
Loopthrough 1
2. . 24V
G ND 2. . 24V
Input 2 Program
D e fa ult O ff
Loopthrough 2
Input 1-P r iority
Input 1 Priority
+
2...24V- Input 1
-
0V- Input 2
Input 2 Enable
+
2..24V- Enable
-
0V- Mute
S lave Input 100V
100V
0
Input
1
figure 3.8: Priority input and control terminals
Bosch Security Systems | 2006-11 | 9922 141 50751en
Trigger 1
Trigger 2
Tel/EMG
LBB1925/10
890019251005
115/230V~,50/60Hz
No.
0
1. Audio+
5. Allcall
2.0V
6.Data-
/Line
PCAudoln
3.Audio-
7.Data+
4.24Vd.c.
8.Chs.GND
/Line
7
6
1-
3
8
3
1
3
1
4
5
5
4
5
4
2
2
Zone 1 output
Input 2
S lave Input
Fault Relays' Output
Apparatus delivered
E na ble
100V
connectored for 230V~
Input
Battery
Main Power
230V~
240V~
Pilot-tone
Battery
Detector
Detection
Off On
Off On
NO COM NC
NO COM NC NO COM NC
100V
0
D ire ct O utput
70V
0
100V
0
70V
0
8
8ohm
G ND
100V
0
100V/70V
D e fa ult O n
S election (12A)
Input 2-P rogra m
Priority Only
0
No Priority
0
Priority
Priority Controlled Output
24V D C In
100V
0
1 00V
0
Input
Priority Only
No Priority
4
Application example for use of the power amplifier
control terminals (see figure 3.8)
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 24 Vdc via the music
zone relays to the input 2 enable control terminals (19).
The LBB1925/10 controls the calls by distributing 24
Vdc 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.
CD
Aux
RS232
100V
0
100V 0
L
+
+
GND
GND
2
1
1
2
-
-
3
3
R
100V 0
100V 0
100V 0
100V 0
MasterOut
Out
Power
LBB 1 938/10
Plena 480W P ower Amplifier
Max. output power 720W
Rated output power 180W
230V~,50/60Hz
S/N.
Design & Quality
Rated input
The Netherlands
Power : 1600VA
Input 1 Priority
Loopthrough 1
Input 2 Program
Loopthrough 2
Input 1 Priority
2...24V- Input 1
0V- Input 2
Input 2 Enable
2..24V- Enable
0V- Mute
S lave Input 100V
LBB1925/10
Apparatus delivered
115V
230V
connected for 230V-
100V 0 100V 0
Rated Input
Power : 50VA
T0.5L 250V
+24V-
+24V-
Warning
This apparatus must be earthed
Zone 2 output
Input 1
Input 2
S lave Input
Fault Relays' Output
P riority
E na ble
100V
8900 193 81001
Input
Battery
Main Power
Pilot-tone
Battery
Detector
Detection
A035413
N663
NL-4827HG-10
Off On
Off On
NO COM NC
NO COM NC NO COM NC
D ire ct O utput
100V
0
70V
2. . 24V
G ND 2. . 24V
G ND
100V
0
D e fa ult O ff
D e fa ult O n
Input 1-P r iority
Input 2-P rogra m
+
-
+
-
Priority Controlled Output
100V
0
100V
0
1 00V
Input
Input
Priority Only
1
4
en | 14
Apparatus delivered
connectored for 230V~
Power
230V~
240V~
Rated input
100V
0
Power : 1600VA
70V
0
0
8
8ohm
100V/70V
S election (12A)
Priority Only
0
No Priority
0
Priority
24V D C In
0
No Priority
to next zones
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