Siemens Cerberus CS1140 - 33 Emergency Power Supply

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91
Fire & Security Products
Siemens Building Technologies Group
05.2003
33 Emergency power supply
33.1 Specifying battery capacity
Battery rated capacity
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: 9% loss (K = 1.1)
Ageing of battery
With increasing age, the battery suffers a loss of capacity

Allow a safety factor for ageing
(Total quiescent current × 1.25 or battery capacity × 0.8)
> 24h in conformity with DIN VDE 0833, part 2, no safety factor is necessary
Calculation
Battery capacity must be calculated individually!
Formula: Ah = A × h × 1.25 (poss. × 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
33.2 Capacity values for standard configurations
Configuration CS1140 Quiescent
current
Battery capacity requirement for
Configuration CS1140
Quiescent
current
12h 24h 72h
CI 128 detectors interactive 7 outputs 260mA 4,2Ah 7,8Ah 18,7Ah
128 detectors AnalogPLUS 7 outputs 235mA 3,8Ah 7,0Ah 16,9Ah
16 collective lines 7 outputs 315mA 5,1Ah 9,4Ah 22,6Ah
CC 512 detectors interactive 32 outputs
704mA 
11,6Ah 21,1Ah 50,6Ah
512 detectors AnalogPLUS 32 outputs 454mA 7,4Ah 13,6Ah 32,6Ah
64 collective lines 32 outputs
924mA 
15,2Ah 27,7Ah 66,5Ah
Notes:
– equipped with 1 operating unit AlgoPilot B3Q...
– 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
– quiescent current for additional battery charging module E3C011 taken into account (where necessary )