Bosch FAS-420-TM - Power Supply

FAS-420-TM Aspirating Smoke Detector Planning | en 55
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
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:
Figure 3.19 Ducts with small and large duct cross-sections
A Cross-sectional area of duct
(with A = a x b)
a Height of air-conditioning
duct
b Width of air-conditioning
duct
FAS / FCSFAS / FCS
A ≤ 0,5 m
2
A > 0,5 m
2
a
100
100
200
150
b
1/2 b
b
1/2 b
a
II II
g
A
n
max
QPS
=
.
n
max
+
.
(n
_
)
max
II II
gA
n
QPS
=
.
+
.
(n
_
)
max
n
n
=
.
L
0,8 K
24
I