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

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
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