Siemens FC924 User Manual

FS20 Marine Fire Detection Control Panel
47
Siemens Industry, Inc. A6V10519176_enUS_b
Building Technologies Division
9.3 Determining the Battery
CALCULATING BATTERY CAPACITY
K
Batt
= (I
R total
* t
R
+ 1
A total
* t
A
) * K
dis
* K
age
K
Batt
Battery capacity in [Ah]
I
R total
Total operating current of all consumers in quiescent condition [A]
1
A total
Total operating current of all consumers in alarm status [A]
t
R
Emergency power time desired in quiescent condition [h]
t
A
Emergency power time desired in alarm status [h] (standard 0.5 h)
K
dis
Correction coefficient for discharge
K
dis
= 1.1 with emergency power time ≤ 12 hours. The coefficient can be ignored for
longer emergency power times.
K
age
Correction co-efficient for aging
K
age
= 1.25 if the emergency power time desired is ≤ 24 h. In all other cases,
the co-efficient can be ignored.
EXAMPLE
K
Batt
= (I
R total
* t
R
+ 1
A total
* t
A
) * K
dis
* K
age
For 12 h emergency power time:
= ((0.9 A * 12h) * 1.1 * 1.25) + ((3.5 A * 0.5 H) * 1.1 * 1.25) = 17.2 Ah
For 24 h emergency power time:
= ((0.9 A * 24h) * 1.25) + ((3.5 A * 0.5 H) * 1.25) = 29.2 Ah
For 72 h emergency power time:
=(0.9 A * 72h) + (3.5 A * 0.5H) = 66.5 Ah
NOTE: Refer to the Section 10 and 11 (Periboard) for Power Supply and Battery parameter settings
and connections.

Siemens FC924 Specifications

General

Brand	Siemens
Model	FC924
Category	Control Panel
Language	English