Emergency power supply

23 Emergency power supply

23.1Specifying battery capacity

23.1.1Battery 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)

23.1.2Ageing of battery

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

23.1.3Calculation

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

23.2Capacity values for standard configurations

Configuration

 

Quiescent current

Battery capacity requirement for

 

12h

24h

72h

 

 

 

128 detectors addressable

7outputs

235mA

3,8Ah

7,0Ah

16,9Ah

16 collective lines

7 outputs

315mA

5,1Ah

9,4Ah

22,6Ah

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

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Siemens Building Technologies

007836_a_en_--.doc

Fire & Security Products

03.2004

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Siemens FC700A manual Emergency power supply, Specifying battery capacity, Capacity values for standard configurations

FC700A specifications

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