Bosch FPA-5000 - Page 46

46 en | Planning Modular Fire Panel
F.01U.028.089 | 8.0 | 2011.07 System Description Bosch Sicherheitssysteme GmbH
Limits:
The current load on a panel rail may not exceed the maximum value of 12 A.
The current load via a panel rail plug may not exceed the maximum value of 10 A.
Figure 3.12 Area 1
Figure 3.13 Area 2
Standby Current Calculation to EN 54-4
Formula (1) describes the maximum system current to guarantee a particular back-up time
(Imax,Standby).
Formula (2) describes the maximum system current taking into account simultaneous battery
charging (Imax.A).
The system standby current (Inom) to be selected is calculated from the lower of the two
maximum system current values, as shown in the formula (3).
Parameters:
–t
Standby
= back-up time in hours
–I
Alarm
= maximum alarm current (Imax,B)
–C
Batt
= battery capacity in Ah
Possible capacities (CBatt):
– 24 - 26 Ah or 36 - 45 Ah with 2 batteries
– 48 - 52 Ah or 72 - 90 Ah with 4 batteries
BCM
3
BCM
4
BCM
1
BCM
2
BCM
5
BCM
6
BCM
7
BCM
8
1
BCM
3
BCM
4
BCM
1
BCM
2
BCM
5
BCM
6
BCM
7
BCM
8
2
I
max, Standby
=
C
Batt
-
I
Alarm
x 0,5h
t
Standby
I
max, A
= 6A -
18h
C
Batt
(1) (2)
I
nom
= min
[
I
max, Standby
, I
max, A
]
(3)