
Bosch Security Systems | 2003-09 | 3922 988 99483en
Plena System Pre-amplifier | Installation and Operating Manual | en | 13
4 External settings and connections (system pre-amplifier)
4.1 Connect the DC supply (battery)
Figure 4.1
The system pre-amplifier has a 24 Vdc input (terminal screw), which you can use to connect a back up power
supply, e.g. batteries. You can earth the unit to increase the electrical stability of the system.
Caution
The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration.
External settings and connections
11
5V
-
2
3
0V
-
I
n
+
2
4V
-
+
24V
-
R
a
t
e
d
i
n
p
u
t
P
o
w
e
r
:
5
0
VA
T
1
.
0
A
L
25
0
V
A
p
p
ar
a
t
u
s
d
e
l
i
v
e
r
ed
c
o
nn
e
c
t
e
d
f
o
r
2
3
0V
-
T
h
i
s
a
p
p
a
r
a
t
u
s
m
u
st
b
e
e
a
r
t
h
e
d
W
a
rn
i
n
g
M
a
s
t
e
r
O
u
t
1
-
4
3
5
T
r
i
g
g
e
r
1
T
e
l
/
EMG
0
Ou
t
C
al
l
I
n
C
a
l
l
Ac
t
i
v
e
Z
on
e
6
Z
o
ne 5
Z
on
e1
CD
L
R
T
r
i
g
g
e
r
2
P
C
Au
d
i
o
I
n
1
.
A
udi
o+
2.
0
V
3.
A
u
di
o-
4.
2
4V
d.c
.
5
.
A
l
l
c
all
6
.
D
at
a-
7
.
D
at
a
+
8
.
C
hs
.
G
N
D
L
B
B
1
9
2
5
/
0
0
8
9
0
0
1
9
2
5
0
0
0
5
1
1
5
/
2
3
0
V
~,5
0
/
6
0
Hz
N
o
.
R
S2
3
2
/
L
i
n
e
/
L
i
n
e
A
u
x
3
5
4
1
2
3
7
6
8
5
4
1
2
2
1
+
-
G
ND
3
1
2
+
-
G
ND
3
Z
one 2
Z
one 3
Zone 4
D
C
O
u
t
D
C
I
n
10
0V
1
00V 0
0
10
0V
0
10
0V
0
1
0
0
V
100
V
0
0
1
0
0
V
1
00V 0
0
0
0V
0
1
00V
0
100V
0
100
V
0
100V
0
+24
V-
+
2
4
V-
1
1
5
V-
2
3
Th
i
sa
ppa
r
atus
m
u
st
b
e
ea
r
th
e
d
War
n
i
n
g
1
2
VDC
1
2
VDC
-
+
-
+
F
F=1.5A
Ap
p
a
r
atus
del
i
v
er
e
d
con
n
e
ct
e
dfor
2
3
0
V-
In
Call I
n
Call Active
6
Zone 3
Z
one 4
D
C
Out
DC In
0
V
0
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