Connecting The Priority Input And Using The Control Terminals - Bosch PLENA LBB1938/30 Installation And Operation Manual

18 en | Operation
8.2

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.
Figure 8.3: LBB1925/10 and power amplifier control terminals example
2018.11 | V1.2 | LBB193x/x0
Trigger 1 Trigger 2
Tel/EMG
0
1. Audio+
2.0V
/Line
3.Audio-
4.24Vd.c.
/Line
1- 3
3 1
4 5 5 4
2
Input 1 Input 2 S lave Input Fault Relays' Output
P riority E na ble 100V
LBB 1938/10 8900 193 81001 Input Battery Main Power
Pilot-tone Battery
Plena 480W P ower Ampli er
Max. output power 720W Detector Detection
Rated output power 180W
A035413
230V~,50/60Hz
N663
S/N. NL-4827HG-10
Design & Quality
The Netherlands O On
O On
NO COM NC NO COM NC NO COM NC
D ire ct O utput
Input 1 Priority
Loopthrough 1
100V 0 70V 0
2. . 24V G ND 2. . 24V G ND 100V 0
Input 2 Program
D e fa ult O D e fa ult O n
Loopthrough 2
Input 1 Priority Input 1-P r iority Input 2-P rogra m
+
2...24V- Input 1 -
0V- Input 2
Input 2 Enable +
2..24V- Enable -
0V- Mute
Priority Controlled Output
S lave Input 100V 100V
0
100V 0 1 00V
Input Input Priority Only No Priority
Installation and operation manual
LBB1925/10
890019251005
115/230V~,50/60Hz
No.
5. Allcall
C D A x u
RS232
6.Data- 100V 0
PCAudoln
7.Data+
8.Chs.GND
L
+ +
GND GND
2 - 1 1 - 2
3 3
R
100V 0 100V 0 100V 0
7 6
8
3 1
MasterOut Out
5 4
2
Apparatus delivered
connectored for 230V~
Power
230V~ 240V~
Rated input
100V
Power : 1600VA
0
70V
0
8ohm
8
100V/70V
S election (12A)
Priority Only
0
No Priority
0
Priority
24V DC In
0
PLENA power amplifiers
LBB1925/10
Apparatus delivered
115V 230V
connected for 230V-
100V 0 100V 0 100V 0
Rated Input
Power : 50VA
T0.5L 250V
100V 0 +24V- +24V-
Warning
This apparatus must be earthed
Input 1 Input 2 S lave Input Fault Relays' Output
P riority E na ble 100V
LBB 1938/10 8900 193 81001 Input Battery Main Power
Pilot-tone Battery
Plena 480W P ower Ampli er
Max. output power 720W Detector Detection
Rated output power 180W
A035413
230V~,50/60Hz
N663
S/N. NL-4827HG-10
Design & Quality
The Netherlands O On
O On
NO COM NC NO COM NC NO COM NC
D ire ct O utput
Input 1 Priority
Loopthrough 1
100V 0 70V
2. . 24V G ND 2. . 24V G ND 100V 0
Input 2 Program
D e fa ult O D e fa ult O n
Loopthrough 2
Input 1 Priority Input 1-P r iority Input 2-P rogra m
+
2...24V- Input 1 -
0V- Input 2
Input 2 Enable +
2..24V- Enable -
0V- Mute
Priority Controlled Output
S lave Input 100V 100V
0
100V 0 1 00V
Input Input Priority Only
Bosch Security Systems B.V.
Apparatus delivered
connectored for 230V~
Power
230V~ 240V~
Rated input
100V
Power : 1600VA
0
70V
0
8ohm
0 8
100V/70V
S election (12A)
Priority Only
0
No Priority
0
Priority
24V DC In
0
No Priority