Achievable Cable Length With Lsn 1500 A - Bosch FPA-5000 System Information Manual
Modular fire panel
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- Wiring manual (326 pages) ,
- System description (178 pages) ,
- System information (174 pages)
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Modular Fire Panel
L [m]
2
0
0
0
1
8
0
0
1
6
0
0
1
4
0
0
1
2
0
0
1
0
0
0
8
0
0
d
6
0
0
2
0
m
A
1
0
m
A
7
5 ,
4
0
0
2
0
0
0
0
1
0
2
0
3
0
4
0
Figure 3.2: Diagram for determining the maximum achievable cable length: LSN improved elements with LSN 0300 A
L =
N =
a =
b =
c =
d =
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
U
End
Bosch Sicherheitssysteme GmbH
a
m
A
5
m
A
4
m
A
3
5
0
6
0
7
0
8
0
9
0
1
cable length in meters
number of LSN improved elements
1600 m limit
bus dynamic limit
maximum possible number of LSN improved elements = 254
300 mA limit
= bus voltage at the connection terminals = 30 volt
= bus end voltage = 15 volt (must not fall below this limit!)
m
A
2
5 ,
m
A
2
m
A
0
0
1
1
0
1
2
0
1
3
0
1
4
0
1
5
0
System Information
1
5 ,
m
A
1
6
0
1
7
0
1
8
0
1
9
0
2
0
0
2
1
09.2017 | 11.3 | F.01U.028.089
Planning | en
31
c
0
2 ,
6
5
m
A
b
0
3 ,
7
5
m
A
0
5 ,
m
A
0
7 ,
m
A
1
m
A
0
2
2
0
2
3
0
2
4
0
2
5
0
N
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