Power Supply - Bosch FAS-420-TM Operation Manual

FAS-420-TM Aspirating Smoke Detector
Figure 3.19 Ducts with small and large duct cross-sections
3.10

Power Supply

To measure the power supply, the detector-ready state of the security system and the alarm
case are regarded. When the system is ready to detect, the power supply must provide the
standby current for the aspirating smoke detectors and ensure the emergency power
rechargeable battery is charged in accordance with DIN VDE 0833, part 1 (80% charged in
24 hrs).
The current in the event of an alarm is calculated according to the following formula:
Calculation of current for space protection
Equipment protection
Charging current
The power for charging the rechargeable battery is calculated with the following formula:
Bosch Sicherheitssysteme GmbH
FAS / FCS
a
1/2 b
b
A > 0,5 m
2
I
=
g
I
g
FAS / FCS
a
150
1/2 b
b
A ≤ 0,5 m
2
200
(n _
I n I n
. + .
A max Q
_
I I (n
. n
= + .
A Q
0,8 K
.
I
=
L
24
Operation Guide
A Cross-sectional area of duct
(with A = a x b)
a Height of air-conditioning
duct
b Width of air-conditioning
100
duct
100
) I
max PS max
n ) I
PS max
n
F.01U.088.878 | 4.1 | 2010.11
Planning | en 55