Bosch FPA-5000 System Information Manual page 29

Modular Fire Panel
n
E
ρ = specific resistance of copper = 0.0178 Ω mm
R
FET
I
NE
I
trans
I
flash
Note that the sum of non-isolated cables must not exceed the limit of 500 m. The limit of
500 m applies to:
–
–
–
The limit of 500 m non-isolated cables doesn't count for the conventional lines of the
FLM-420/4‑CON and the lines connected to the relay contacts and open collector outputs.
Note that the maximum cable length must not exceed 1600 m.
Using the Diagram for LSN classic
FET resistance = 0.7 Ω, fire alarm cable with Ø 0.8 mm
Example 1:
You want to know the maximum cable length for a given number of network elements and a
given current consumption (n
reach the 3 mA curve. Then, from the point of intersection go horizontally to the left to the Y
axis and read off the maximum achievable cable length. In this example it is 840 m.
Example 2:
You want to know the maximum number of network elements for a given cable length and an
average current consumption of the network elements (L = 1000 m, I
the Y axis at 1000, go horizontally across to the right as far as the 20 mA curve and then from
the point of intersection vertically down to the X axis. Read off the maximum number of
network elements, in this example it is 8.
Notice!
Remote indicators activated by the detector C point:
A maximum additional cable length of 500 m is allowed when using remote indicators (e.g.
FAA-420-RI-DIN/FAA-420-RI-ROW). The total length of installed cable must not exceed the
limit of 1600 m.
Bosch Sicherheitssysteme GmbH
= number of elements
= FET resistance = 0.7 Ω (LSN classic) or 0.35 Ω (LSN improved),
= average current consumption of elements in [A]
= transmission current = 0.012 A
= flash current = 0.018 A
The lines on the inputs of the following modules: FLM-420-RHV, FLM-420-I2 , FLM-420-
I8R1-S, FLM-420-O8I2-S, FLM-420-O1I1, FLM-420-RLE-S
The NAC line of the FLM-420-NAC module
The lines to remote indicators: FAA-420-RI-DIN, FAA-420-RI-ROW
2
/m)
= 50, I = 3 mA). On the X axis, go vertically up at 50 until you
E NE
System Information
Planning | en 29
= 20 mA). Starting from
NE
09.2017 | 11.3 | F.01U.028.089