Battery Capacity; Fc121-Za Calculation; Fc122-Za Calculation - Siemens FC121-ZA Technical Manual

11
11.1
Type Description
FC121-ZA 2 zone panel
Out 1 (e.g. Sounders)
Out 2 (e.g. Sounders)
Aux. output
Accessory cards
FCA1203-Z1 Output card 2M 2R
(1st)
Out A&B (e.g. Sounders)
FTO1203-H1 EVAC Module
Standby current [A]
Alarm current [A]
Choose the appropriate battery size depending on the calculated capacity.
[(Standby time × Standby current) + (Alarm time × sum alarm current)] × Aging factor = Capacity (max.12 Ah)
_ _ h × 0._ _ _ A
Standby time [h]:
Alarm time [h]:
Aging factor:
Standby current [A]:
Alarm current [A]:
Capacity [Ah]:
11.2
Type Description
76
Smart Infrastructure

Battery capacity

The battery capacity depends on panel type and standby time. The standby time is
regulated by local code of praxis or the EN regulation.
The required battery size can be identified using the following calculation.
Moreover, the calculation indicates whether an external power supply is needed.

FC121-ZA calculation

If the total current of the outputs (Sounders, etc.) is higher than 500mA, then an external
power supply is required.
In order to reduce the total current:
-
Power the output A&B from the external power supply (possible per card).
-
Move the Auxiliary output to the external power supply.
+ 0.5 h
24, 30 or 72
0.5 hour
1.25
Total current in standby mode
Total current in alarm mode
4.5 Ah; 7 Ah

FC122-ZA calculation

Standby Alarm
[mA] [mA]
12 25
0.5 2.2
× _._ _ _ A × 1.25
Standby Alarm
Panel (internally) Sounders, etc...
Standby Alarm Standby
[mA] [mA]
38 107
=
Panel (internally) Sounders, etc...
A6V10393190_h_en_--
Alarm
[mA]
[mA]
2019-09-01