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Connecting The Priority Input And Using The Control Terminals (Lbb1938 Only) - Bosch LBB 1930 Installation And Operating Manual

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Plena Booster Amplifier | Installation and Operating Manual |
4.3 Connecting the priority input and using the control terminals (LBB1938
only)
Input 1 Prior ity
Input 1
Input 2
Sla ve Input
Loopthroug h 1
Priority
Enab le
100V
Input 2 Program
Loopthrough 2
Input 1 Prior ity
+
2..24V -Input 1
-
0V-Input 2
Input 2 Enable
+
2..24V-Enable
-
0V-Mute
Sla ve Input 100V
100V
100V
0
2...24V
GND 2...24V
GND
0
Default Off
Default On
Input 1-Priority
Input 2-Program
Input
Input
1
4
Figure 4.4
Next to the program input (Input 2-Program) the booster amplifier LBB1938 is also provided with a balanced
priority input (Input 1-Priority) for connection to another preamplifier or mixer.
Apply a control voltage of 2...24 V to the input 1 priority control terminals (15) to switch ON the priority input (1)
and mute the program input (4). In this way 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 (14).
Application example for use of the LBB1938 control terminals (see fig. 4.4)
You can use up to six LBB1938 boosters in combination with the Plena LBB1925/10 System Pre-amplifier to build
a powerful multi-zone sound system. Zone switching of background music and calls is done via the LBB1925/10
zone relays in combination with the LBB1938 control terminals. The LBB1925/10 controls the background music
by distributing 24 Vdc via the music zone relays to the LBB1938 input 2 enable control terminals (14). The
LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the LBB1938 input 1 priority
control terminals (15). Each booster serves one loudspeaker zone. Each zone can be OFF, or receive music or a call.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Trigger 1
Trigger 2
Tel/EMG
LBB1925/10
890019251005
115/230V~,50/60Hz
No.
0
1. Audio+
5. Allcall
CD
2.0V
6.Data-
RS232
/Line
PCAudoln
3.Audio-
7.Data+
4.24Vd.c.
8.Chs.GND
L
/Line
R
7
6
1-
3
8
3
1
3
1
MasterOut
Out
4
5
5
4
5
4
2
2
Zone 1 output
LBB1938
Direct Output
100V
0
70V
0
8ohm
100V/70V
100V
0
70V
0
8
Priority Only
Priority Controlled Output
0
No Pr iority
Priority Only
No Priority
0
Priority
100V
0
100V
0
External settings and connections
LBB1925/10
Apparatus delivered
connected for 230V-
Aux
100V
0
100V 0
100V 0 100V 0
+
GND
GND
+
2
-
1
1
-
2
3
3
100V 0
100V 0
100V 0
100V 0
+24V-
+24V-
Warning
This apparatus must be earthed
Input 1 Prior ity
Input 1
Input 2
Sla ve Input
Loopthroug h 1
Priority
Enab le
100V
Input 2 Program
Loopthrough 2
Input 1 Prior ity
+
2..24V -Input 1
-
0V-Input 2
Input 2 Enable
+
2..24V-Enable
-
0V-Mute
Sla ve Input 100V
100V
100V
0
2...24V
GND 2...24V
GND
0
Default Off
Default On
Input 1-Priority
Input 2-Program
Input
Input
1
4
en | 14
115V
230V
Rated Input
Power : 50VA
T0.5L 250V
Zone 2 output
LBB1938
Direct Output
100V
0
70V
0
8ohm
100V/70V
100V
0
70V
0
8
Priority Only
Priority Controlled Output
0
No Pr iority
Priority Only
No Priority
0
Priority
100V
0
100V
0
to next zones

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This manual is also suitable for:

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