Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier
| Installation and Operating Manual |
en
| 17
LBB1938 only:
Ensure that the fuse for loudspeaker voltage selection is properly set (see chapter 2). The Priority Only and No
Priority outputs are controlled by a priority relay. The Priority Only output only provides priority announcements,
while the No Priority output just provides the program signal and switches OFF at priority calls. You can also use
the Priority Only output for 3-wire remote volume control override. In this case, ensure that the selected voltage for
the Priority Only output is the same as for the direct output used.
4.5.2Low impedance loudspeakers
Connect low impedance loudspeakers to the 8 Ohm/0 terminals. This output can deliver the rated output power
into an 8 Ohm load. Connect multiple loudspeakers in a series/parallel-arrangement to make the combined
impedance 8 Ohm or higher. Check the loudspeaker polarity for in-phase connection.
4.6 Mains connection
Figure 4.11
Figure 4.12
Use the supplied mains cord to connect the system to the mains supply.
Note (LBB 1930 and LBB 1935 only)
If necessary set the mains voltage switch 230/240 V (11) to the required voltage using a sharp object,
e.g. a small screwdriver.
230V-
240V-
70V
0
0
8
-
+
Line fus
e
250V T1
A App
aratus de
livered
conne
cted fo
r 230V-
This appar
atus mu
st be
earthed
Warning
24V DC
IN
230V-
240V-
100V
70V
0
0
8
-
+
Line fus
e
250V T1
A
Apparatu
s delive
red
connect
ed for 2
30V-
This app
aratus m
ust be
earthed
Warning
24V DC
IN
2
1
3
4
Mic/Lin
e
Mic/Lin
e
CD
L
R
Aux
Line Ou
t 1V
Inc
Out
In
Tel/Eme
r.
0
0 2
Chime
4 .5
1- -3
11
LBB1930
LBB1935
Apparatus
delivere
d
connect
ed for
230V-
Rated
input
Line fuse
T10L25
0V
power
: 1600V
This app
aratus mu
st be eart
hed
Warning
Priority
Controlle
d Outpu
t
No prior
ity
Priority
only
Direct O
utput
24VDC
IN
V
70V
0
0
8
V 0
100V
0
Apparat
us deliver
ed
connect
ed for 2
30V-
Rated
input
Line fus
e
T10L25
0V
power
: 1600V
This ap
paratus
must be
earthed
Warning
Priority
Control
led Outp
ut
No prio
rity
Input 1-P
riority
Input 1
Priority
Slave In
put
100V
Input 2
Enable
Input 2-P
rogram
Priority
only
Direct
Output
24VDC
IN
Input
Loopthro
ugh
Loopthro
ugh
Input
100V
70V
0
0
8
100V
0
100V
0
LBB1938
External settings and connections
Summary of Contents for LBB 1930
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