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
Off On
24V DC In
Apparatus delivered
connectored for 230V~
Main Power
Battery
Input
Fault Relays' Output
NO COM NC
Off On
NO COM NC
NO COM NC
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
100V
0
S lave Input 100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
S elec tion (12A)
Priority Only
0
0
No Priority
Priority
F7
0
1
F7
0
2
Battery
Power
Detection
Pilot-tone
Detector
230V~
240V~
Design & Quality
The Netherlands
LBB 1938/10
NL-4827HG-10
Plena 480W P ower Amplifier
Max. output power 720W
Rated output power 180W
230V~,50/60Hz
S/N.
8900 193 81001
A035413
Mad
e
in
Chin
a
N663
Rated input
Power : 1600VA
I nput 1
P riority
S lave Input
1 0 0 V
I nput 2
E na ble
1 0 0 V
0
1 0 0 V
7 0 V
0
0
8
D ire ct O utput
Input
Input
Input 2-P rogra m
I nput 1-P r iority
2 . . 2 4 V
D e fa ult O ff
G ND 2 . . 2 4 V
D e fa ult O n
G ND
Priority Only
No Priority
100V
0
1 00V
0
Priority Controlled Output
Off On
24V DC In
Apparatus delivered
connectored for 230V~
Main Power
Battery
Input
Fault Relays' Output
NO COM NC
Off On
NO COM NC
NO COM NC
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
100V
0
S lave Input 100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
S elec tion (12A)
Priority Only
0
0
No Priority
Priority
F
7
0
1
F7
0
2
Battery
Power
Detection
Pilot-tone
Detector
230V~
240V~
Design & Quality
The Netherlands
LBB 1938/10
NL-4827HG-10
Plena 480W P ower Amplifier
Max. output power 720W
Rated output power 180W
230V~,50/60Hz
S/N.
8900 193 81001
A035413
Mad
e
in
Chin
a
N663
Rated input
Power : 1600VA
I nput 1
P riority
S lave Input
1 0 0 V
I nput 2
E na ble
1 0 0 V
0
1 0 0 V
7 0 V
0
0
8
D ire ct O utput
I nput
I nput
I nput 2-P rogra m
I nput 1-P r iority
2 . . 2 4 V
D e fa ult O ff
G ND 2 . . 2 4 V
D e fa ult O n
G ND
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
x
u
A
D
C
MasterOut
Out
100V 0
100V 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 must be earthed
Warning
3
7
8
6
1
5
2
4
3
1
5
2
4
LBB1925/10
890019251005
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
