Brooks FireTracker FT2GAS, Руководство по эксплуатации и техническому обслуживанию, Страница: 41 / 58

FT2GAS
Gaseous Extinguishing System
Rev No. 1.3
41
Typical
I
A
calculations:
Items
Qiescent
Current
(mA)
Alarm
Current
(mA)
Qty
Total Alarm
Current (mA)
FT2GAS 75 250 1 250
Local Control Station (LCS) 0 60 3 180
“Fire Alarm / Do Not Enter” Sign 0 95 3 285
“Fire Alarm / Evacuate” Sign 0 95 3 285
“System Inoperative” Sign 0 95 3 285
3A Gas Discharge for 1 min 0 50
Optional Tone / Voice Sounders 0 135 6 810
Total Load current (mA) 75 1995
C20, Required Battery Capacity =
= 11.15 Ah
Battery Charger Calculations
Battery charger Ah required for 96 hours= (5xI
Q
) + F
c
(0.5xI
A
)
= (5x0.075) + 2(0.5x1.145)
= 1.52 Ah
Battery charging current required =
= 1.52/(96x0.75)
= 21.11 mA
1.2[(0.2(1.995x0.5+0.05)]
,where η is efficiency of
battery manufacturer typically
75%-85% (BB Battery)
η ×
Q
T
Required Ah Charger Battery
Therefore, a battery capacity close to 11Ah battery or next higher with a battery charging current of
21.11 mA would be sufficient for this example.
Standard FT2GAS is equipped with 5.5 Amp switch mode power supply and space for 12 AH SLA
batteries.