Bosch FCS‑320‑TM Series Operation Manual page 58

58 en | Installing the Aspiration smoke detector
Standby current of the line
Calculate the standby current I
where
R
E
U
L
I = Standby current of the line [A]
R
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:
where
R
ER
U
L
I = Standby current of the line [A]
R
2020.04 | 2.1 | F.01U.130.928
= original terminal resistance of the line [Ohm]
= Line voltage [V]
= Terminal resistance on the reset board [Ohms]
= Line voltage [V]
of the line as follows:
R
Operation guide
Conventional Aspiration smoke detector
Bosch Sicherheitssysteme GmbH
as
ER