Bosch FPA‑5000 System Information page 39

Modular fire panel
U
End
q = cable cross section = 0.503 mm
n
E
ρ = specific resistance of copper = 0.0178 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 3000 m.
Using the Diagram for LSN improved
FET resistance = 0.35 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
you reach the 0.5 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 1950 m.
Example 2:
You want to know the maximum number of network elements for a given cable length
(L = 1000 m, I
far as the 2 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 73.
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 3000 m.
Bosch Sicherheitssysteme GmbH
= bus end voltage = 15 volt (must not fall below this limit!)
= 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 mA). Starting from the Y axis at 1000, go horizontally across to the right as
NE
2
(for cable Ø 0.8 mm)
2
/m)
= 120, IN = 0.5 mA). On the X axis, go vertically up at 120 until
E E
System Information
Planning | en 39
07.2020 | 12.0 | F.01U.028.089