Emergency Power Supply; Specifying Battery Capacity; 23.1.1 Battery Rated Capacity; 23.1.2 Ageing Of Battery - Siemens FC700A System Planning Manual

Emergency power supply

23 Emergency power supply
23.1

Specifying battery capacity

23.1.1 Battery rated capacity

23.1.2 Ageing of battery

23.1.3 Calculation

23.2

Capacity values for standard configurations

54
Siemens Building Technologies
Fire & Security Products
The battery rated capacity is based on the discharge over a period of 20 hours
–
Faster discharge causes a loss of capacity:
–
Discharge over 12-hour period:
With increasing age, the battery suffers a loss of capacity
–
Allow a safety factor for ageing
(Total quiescent current y 1.25 or battery capacity y 0.8)
> 24h in conformity with DIN VDE 0833, part 2, no safety factor is necessary
Battery capacity must be calculated individually!
Formula: Ah = A x h x 1.25 (poss. x K)
Ah = Battery capacity in Ah
A = the sum of the quiescent current for all modules
h = Required operating period in hours
1.25 = Safety factor for ageing
K = Capacity loss if discharge is over considerably less than 20 hours
Configuration
128 detectors addressable
16 collective lines
Notes:
Equipped with 1 control terminal B3Q700
–
Discharge over a 12-hour period, 9% loss of capacity taken into account
–
Factor 1.25 for ageing taken into account at 12h and 24h (72h without safety
–
factor)
Without remote transmission equipment
–
Only quiescent current taken into account
–
9% loss (K = 1.1)
Quiescent current
7outputs 235mA
7 outputs 315mA
Battery capacity requirement for
12h 24h
3,8Ah 7,0Ah 16,9Ah
5,1Ah 9,4Ah 22,6Ah
007836_a_en_--.doc
03.2004
72h