Bosch FPA-5000 - Diagnostics

Modular Fire Panel Planning | en 31
Bosch Sicherheitssysteme GmbH System Information 09.2017 | 11.3 | F.01U.028.089
0
0
0
2
0
0
4
0
06
0
08
0
0
01
0021
0041
0061
0
0
81
0002
L [m]
0
52042032
0
22012
0
020
9
10
8
1
0
7
1
0
6
105
1
0410310
2
101
1
00109
080
706
0
50
4
0302
0
10
Am1
Am3
A
m4
A
m7
,0
Am2
Am5
,
2
Am5
Am01
Am02
A
m
5,7
Am562,0
Am573,0
Am5,0
Am5,1
N
a
b
c
d
Figure3.2: Diagram for determining the maximum achievable cable length: LSN improved elements with LSN 0300 A
L = cable length in meters
N = number of LSN improved elements
a = 1600 m limit
b = bus dynamic limit
c = maximum possible number of LSN improved elements = 254
d = 300mA limit
3.6 Achievable Cable Length with LSN1500A
The usable cable length depends essentially on the resistance of the cable and the quantity
and current consumption of the network elements.
The way in which the elements are distributed locally on the bus also makes a difference. The
possible cable length can be estimated using the formula below. This formula is also used in
the Planning Software by Bosch for fire alarm systems and is based on the critical application
situation where all network elements are concentrated at the end of the bus line. The
calculated cable lengths are therefore on the conservative side.
The diagrams on pages and can be used to make a quick estimate.
The following applies:
L = cable length to be calculated in[m]
U
0
= bus voltage at the connection terminals = 30volt
U
End
= bus end voltage = 15volt (must not fall below this limit!)