Siemens FS20 - Page 157

Determining the compact stations
Determining the batteries and power supply
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Building Technologies
008843_v_en_
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Fire Safety
2015
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Determining the relevant total current consumption
For the selection of the power supply, only the higher of the two total current values
must be taken into account:
I
total
= higher value of I
total_A
or I
total_R
Legend
I
total_A
Total current in alarm condition [A]
I
total_R
Total current in quiescent condition [A]
I
A total
Operating current of all consumers in alarm condition [A]
I
R total
Operating current of all consumers in quiescent condition [A]
I
L
Charging current [A]
I
total
Relevant total current [A]
11.3.4.2 Selecting the power supply
Selecting the power supply
The total current I
total
must be lower than the maximum output current of the power
supply unit.
The tables below list the maximum output current values and the maximum
possible battery capacity of the power supply units.
Power supply
Perfor
mance
Maximum output current
Minimum
possible
battery
capacity
Maximum
possible battery
capacity
[W] I
max.
[A] I
max. a
[A]
I
max. b
[A]
[Ah] [Ah]
Integrated power supply (70 W) 70 2.5
Accordin
g to
separate
Table
7 17
Integrated power supply (150 W)-A4 150 5 4.2 17 45
Integrated power supply (150 W)-A5 150 5 4.4 17 45
Integrated power supply (150 W)-A4
plus an optional power supply kit
(150 W)-A4
300 10 A 4.2 45 65
Integrated power supply (150 W)-A5
plus an optional power supply kit
(150 W)-A5
300 10 A 7.6 45 100
● The -A5 power supply is only available at a later point. Please refer to the
separate product information for this.
● The calculated battery capacity should not exceed the maximum possible
battery capacity of the power supply.
● The required power supply can affect the size of the housing.