GST GST-IFP8, Инструкция по установке и эксплуатации, Страница: 55 / 66

GST-IFP8 Intelligent Fire Alarm Control Panel
Installation and Operation Manual
Page 45
Chapter 7 Standby Battery Calculations
Equation for calculating the battery capacity:
Battery capacity
（
Ah
）
=I
Qmax
×T
1
+(I
Qmin
+I
Lmax
+I
Fout
) ×T
2
In which:
I
Qmax
＝
1.4A, which is the quiescent current when the FACP is full-loaded;
I
Qmin
＝
0.4A, is the quiescent current when the FACP is with no load;
I
Lmax
＝
2.4A, is the maximum loop current;
I
Fout
＝
0.2A+0.2A+1A
＝
1.4A, which is the alarm output current (The FACP provides
3 fire alarm outputs, output current of each is 0.2A, 0.2A and 1A respectively).
T
1
is the monitoring time when the FACP is full-loaded, which shall be at least
24 hours according to EN 54-4.
T
2
is the alarm time which shall be at least 30 minutes according to EN 54-4.
From the above equation, we can get the battery capacity is 35.75Ah, so that a 38Ah
battery is recommended.