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Aspirating Smoke Detector
Notice!
Do not use glue to connect the aspiration pipe and pipe connection.
In the event of sharp temperature fluctuations, the pipe must be fixed immediately in front of
the unit so that the pipe does not pull out of the pipe connection when the length changes
(see Length Change of the Pipe System).
5.5
Installing the Reset Board
5.5.1
Installing the reset board
The reset board is optionally available for use with the FCS-320 series. If several FCS-320
units are connected to one detector line, the reset board is installed in the detector line after
the last FCS-320 unit. The reset board electrically connected in accordance with the wiring
diagram.
Notice!
The reset board can be used only if the standby current of the detector line is between 5 mA
and 50 mA and the detector line terminates with a resistor.
Standby current of the line
Calculate the standby current I
I =
R
where
R
E
the line [A]The equations used to calculate the terminal resistance and the standby current of
the detector line are based on an ideal condition for signal evaluation.If acknowledgement
does not take place with the calculated terminal resistance for the relay board, reduce the
value of the terminal resistance by approx. 20%.
Terminal resistance
The reset board simulates the detector line terminal resistance. It is calculated anew and
installed on the reset board (Terminal X1). Calculate the value of the terminal resistance R
follows:
R
ER
where
R
ER
of the line [A]
Bosch Sicherheitssysteme GmbH
U
L
R
E
= original terminal resistance of the line [Ohm]U
(
)
U
2,7 V
−
L
=
I
R
= Terminal resistance on the reset board [Ohms]U
Installing the Aspirating Smoke Detector | en
of the line as follows:
R
= Line voltage [V]I
L
L
Operation Guide
= Standby current of
R
= Line voltage [V]I
= Standby current
R
2018.04 | 2.0 | F.01U.130.926
83
as
ER
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