Bosch PLENA LBB1938/30 - Priority Input and Control Terminals

18 en | Operation PLENA power amplifiers
2018.11 | V1.2 | LBB193x/x0 Installation and operation manual Bosch Security Systems B.V.
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.
Priority Only No Priority
100V 0 1 00V 0
Priority Controlled Output
O On
24V DCIn
Apparatus delivered
connectored for230V~
Main Power
BatteryInput
Fault Relays' Output
NOCOM NC
O On
NOCOM NC NO COMN C
Input1 Priority
Loopthrough1
Input2 Program
Loopthrough2
Input1 Priority
2...24V- Input1
0V-I nput2
Input2 Enable
2..24V- Enable
0V-M ute
100V
0
Slave Input100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection (12A)
PriorityOnly
0
0
NoPrior ity
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design& Quality
TheNetherlands
LBB1938 /10
NL-4827HG-10
Plena480W Power Amplier
Max.output power720W
Ratedoutput power180W
230V~,50/60Hz
S/N.
8900 19381001
A035413
Madein China
N663
Rated input
Power : 1600VA
In put 1
P rior ity
S lave I nput
10 0V
In put 2
E na ble
100 V 0
10 0V 70V0 0 8
Di rect O utput
In putIn put
In put 2-P ro gra mIn put 1-P r iority
2. .24V
De fault O
GND 2 ..2 4V
De fault On
GND
Priority Only No Priority
100V 0 1 00V 0
Priority Controlled Output
O On
24V DCIn
Apparatus delivered
connectored for230V~
Main Power
BatteryInput
Fault Relays' Output
NOCOM NC
O On
NOCOM NC NO COMN C
Input1 Priority
Loopthrough1
Input2 Program
Loopthrough2
Input1 Priority
2...24V- Input1
0V-I nput2
Input2 Enable
2..24V- Enable
0V-M ute
100V
0
Slave Input100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Selection (12A)
PriorityOnly
0
0
NoPrior ity
Priority
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design& Quality
TheNetherlands
LBB1938 /10
NL-4827HG-10
Plena480W Power Amplier
Max.output power720W
Ratedoutput power180W
230V~,50/60Hz
S/N.
8900 19381001
A035413
Madein China
N663
Rated input
Power : 1600VA
In put 1
P rior ity
S lave I nput
10 0V
In put 2
E na ble
100 V 0
10 0V 70V0 0 8
Di rect O utpu t
In putIn put
In put 2-P r ogra mIn put 1-P r iority
2. .24V
De fault O
GND 2 ..2 4V
De fault On
GND
3
Tel/EMG
0
L
R
1-
4 5
/Line
/Line
Trigger 1 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
Rated Input
Power :50VA
T0.5L 250V
Apparatus delivered
connected for 230V-
0 100V 0 100V 0 100V 0
+24V- +24V-
This apparatus mustbe earthed
Warning
3
7
8
6
1
5
2
4
3 1
5
2
4
LBB19 25/10
890 01925 1005
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