Bosch DCN Next Generation Installation & User's Instructions page 18

DCN Next Generation | Installation and User Instructions | System Design and Planning
1.7.5.3 Total power consumption
Do as follows:
1 Find the power consumption of each device from the
consumption table (refer to table 1.2).
2 Add together the power used by all the devices. The
result is the total power consumption of the devices
that are connected to the socket.
1.7.5.4 Length of the longest extension cable
sequence
Do as follows:
1 Add together the lengths of all extension cables in
the longest sequence.
For example, an extension cable of 20 m is connected
directly to a DCN socket of the central control unit. To
the extension cable, a trunk splitter is connected. To
each tap-off socket of the trunk splitter, an extension
cable is connected. One extension cable has a length of
10 m, the other extension cable has a length of 40 m.
The length of the longest extension cable sequence is, in
this example: 20 + 40 = 60 m.
85
80
75
81
70
76
65
70
60 65
55 60
50
54
45 49
40
43
35 38
30
32
25 27
20
21
15
16
10 11
5
0 20
DCN-CCU, DCN-CCUB
+
figure 1.4: Power correction graph
Bosch Security Systems | 2007-02 | 9922 141 70525
84
78
72 80
73
66 82
66 75
60
54 60 67
48 53 60
42 46 52
36 40 45
30 33 37
24 26 30
18 20 22
12 13 15
6 6 6 7
40 60 80
DCN-EPS
1.7.5.5 Graph
The power correction graph (refer to figure 1.4) corrects
the power level to compensate for the extension cables.
Do as follows:
1 Find the total power consumption (refer to section
1.7.5.3) on the vertical axis (Y) of the power
correction graph. For example, 40 W.
2 Find the length of the longest extension cable
sequence (refer to section 1.7.5.4) on the horizontal
axis (X) of the power correction graph. For example,
60 m.
The intersection of both values gives the necessary
power from the socket. In this example it is 53 W.
85
83
77
73 80
68
64 76
70
60
65
51 55 60
42 46 50 54
34 36 40 43
25 27 30 32
17 18 20 21
8 9 10 11
100 120 140 160
X: Extension cable (m)
84
72 80
75
60 66 85
60 68 73
48 53
51 55
36 40 45
34 36
24 26 30
12 13 15 17 18
180 200 220 240 250
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