Siemens FC700A User Manual

54 

Siemens Building Technologies

 

 007836_a_en_--.doc

Fire & Security Products 

 

03.2004

 
 

 

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The battery rated capacity is based on the discharge over a period of 20 hours 

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Faster discharge causes a loss of capacity: 

 

Discharge over 12-hour period: 

9% loss (K = 1.1) 

 

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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 

 

 

128 detectors addressable 

7outputs 

235mA 

3,8Ah 

7,0Ah 

16,9Ah 

16 collective lines   

7 outputs 

315mA 

5,1Ah 

9,4Ah 

22,6Ah 

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Equipped with 1 control terminal B3Q700 

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Discharge over a 12-hour period, 9% loss of capacity taken into account 

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Factor 1.25 for ageing taken into account at 12h and 24h (72h without safety 
factor) 

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Without remote transmission equipment 

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Only quiescent current taken into account