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As per AS1670.1 Section 3.16.4, the battery capacity requirement is calculated as follows:
C
= 1.25 [(I
20
Where
Refer to Brooks spreadsheet to automatically calculate the battery capacity.
Comments regarding
has to be ≤ 3.3 A.
I
Q
has to be ≤ 6.3 A.
I
A
For the total FT1020G3 current consumption in relation to backup time, see tables in
chapter 28.4 "Standby power source" below.
28.3
Main power source (power supply)
The main power source is a Switching Power Supply which is an AC to DC converter from
230 V
to 24 V
AC
consumption including maximum battery charging current must not at any time
exceed 6.3 A. Allowed input voltage is 176-264 V
tolerance of ±1%.
28.4
Standby power source (Batteries)
The standby power source is two x 12V batteries. Only batteries with a specified "Final
voltage" of 10.5 V must be used.
The standby battery capacity must be calculated as per AS1670.1 (section 28.2 above).
The battery backup time is 24 hours in normal state and 0.5 hour in alarm state.
The electrical capacity of the batteries varies with ambient temperature and discharge
current. Furthermore the battery voltage at the end of a discharging period is not the same
as at the start. As required by AS1670.1, the calculation of battery capacity shown in
section 28.2 has included 80% de-rating in battery capacity. See FT1020G3 spreadsheet
for battery capacity calculation.
Note: the battery leads between the 5010 board and batteries must be kept as short as
possible, cable used should be at least 2.5 mm². If the battery leads cable require to be
longer, 4 mm² cable should be used and maximum cable length should not exceed 3
metres.
182
Including the COM loop units and any external equipment connected to the CIE e.g. ASE, OWS, etc. but excluding battery
charging current.
183
External equipment connected to the control unit (e.g. 60W OWS, sounders, relays, routing equipment, etc.). Note: 120W or
250W OWS current consumption not included, they have its own power supply and batteries.
184
The output voltage is factory set to 24V
(±10%) available. Do not use this potentiometer unless the output voltage is not 24V
x T
) + FC (I
x T
)]
Q
Q
A
A
C
= Battery Capacity in AH at 20h discharge rate at 15C - 30C
20
1.25 = Compensation factor for expected battery deterioration
I
= Total system quiescent current in Ampere
Q
T
= Quiescent standby power source time, normally 24 hours for externally
Q
monitored systems and 72 hours for unmonitored systems
FC = Capacity de-rating factor, typically 2
I
= Total system alarm current in Ampere
A
T
= Alarm load standby power source time, normally 0.5 hour
A
and
:
I
I
Q
A
, 6.5A but the main board fuse F1 = 6.3 A, i.e. the total current
DC
184
. On the power supply, a potentiometer is provide for output voltage adjustment
DC
179
Technical/Programming Manual
FT1020G3 Rev 2.2.1
182
183
. The output voltage is 24 V
AC
.
DC
with a
DC
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