Bosch Security Systems | 2003-09 | 3922 988 99483en
Plena System Pre-amplifier | Installation and Operating Manual | en | 7
1 About the system pre-amplifier
Figure 1.1
Figure 1.2
The Plena System Pre-amplifier is a mono amplifier, which mixes a call-station signal with a background music
signal. You can adjust the volume and tone for both signals. The background music channel has 3 possible inputs
(CD, Tape and AUX) and a direct XLR output for 2-channel use. Internal relays control the audio routing to the
6 zones. The zone selection keys at the front determine to which zones the background music is send.
About the system pre-amplifier
/
L
i
n
e
P
ower
CD
A
UX
Se
l
e
c
t
Z
1
Z
2
Z
3
+
+
Z4
Z5
Z6
0
d
B
-6
dB
-
2
0
dB
P
l
ena Sy
stem P
re
-amp
l
ifier
Priority
JP101
Speech filter
M.C.U.
Call Station In Use
CD
Aux
Trigger 1
Trigger 2
Selector
/Line
1mV
200mV
PC Audio In
Out
RS-485
Announcement
Tone Control
Tone Control
Music
Alarm/Timer/Chime
Master out
Z1
RS-232
P.S.
Tel/EMG
Headphone
S101
1
ON/OFF
VU LED
VOX
A1
Tigger 2
Chime
Interface
B1
Tigger 1
Alarm/Timer
Tone Tone
B2
Alarm/Timer
Tone
Block Diagram LBB 1925/10
S302
S301
S303
Z2 Z4Z3 Z5 Z6
A2
Z6Z5Z4Z3Z2Z1
Tone
87654312
312 45 768
312 4 5 768
LBB1941/00
201
VR101
VR1
O
O
JP102
Key switch
Front panel
Zone 1
RA1
R1
RB1
Call 100V
Call 0V
BGM 100V
BGM 0V
CAll & BGM 0V
Zone 1,0V Out
Zone 1,100V Out
Zone 1 override
J2
RB2
Zone 2 override
Zone 2,100V Out
Zone 2,0V Out
Zone 2
Key switch
Front panel
CAll & BGM 0V
RA2
RB3
Zone 3 override
Zone 3,100V Out
Zone 3,0V Out
Zone 3
Key switch
Front panel
CAll & BGM 0V
RA3
RB4
Zone 4 override
Zone 4,100V Out
Zone 4,0V Out
Zone 4
Key switch
Front panel
CAll & BGM 0V
RA4
RB5
Zone 5 override
Zone 5,100V Out
Zone 5,0V Out
Zone 5
Key switch
Front panel
CAll & BGM 0V
RA5
RB6
Zone 6 override
Zone 6,100V Out
Zone 6,0V Out
Zone 6
Key switch
Front panel
CAll & BGM 0V
RA6
Call active
24V DC OUT
24V DC IN
18V DC
-
+
1.5A
F101
F1
0.5A
115V/230V
F102F101
0.5A 0.5A
24V DC
-
+
2-CH use1-CH use
24V DC
J4
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