F3200/NDU AS4428.1 Installation Manual
Document No: LT0255
Configuring a FIP
Page 4-4
5 July 2016
Issue 1.22
GENERAL (CONTINUED)
4.
The approvals laboratory recommends using 90% de-rating of batteries used on
F3200 because the battery fail voltage (Standby) is 22V instead of 21V (as used on
some other FIPs). The local approval body may not require this, however, because
although the F3200 will not generate new alarms below the battery fail voltage, it will
maintain any alarms and outputs that occurred when the voltage was higher than the
battery fail voltage. AS1670.1 does, however, recommend 80% de-rating of batteries
for the effect of ageing, i.e. multiply the required battery capacity (at end of life) by
1.25 when calculating the required capacity for a new battery.
5.
For maximum physical battery sizes refer to "Battery Size". (Refer to Section 4.3.4).
4.3.2
BATTERY/CHARGER CALCULATIONS
The recommended order of calculations is as follows:
1.
Calculate the FIP quiescent load (Iq) from the figures given in Section 3.3.5. Note
that the detector load for each AZC has to be added to the quiescent current per
AZC. Calculate In separately, where In is the external non-alarm, non-battery
backed load on the FIP PSU (e.g. door holders).
2.
Calculate the FIP alarm load (Ia) for 2 zones in alarm from Section 3.3.5. (Include all
external loads e.g. Warning System, relays).
3.
Calculate the 5 hour/0.5 hour battery capacity for the charger requirement as follows:
Cap (5 hr) = (5 x Iq) + (0.5 Ia x 2) Ah
= 5Iq + 0.66Ia where
Iq = quiescent current
Ia = alarm current
Note that the 2 multiplier increases the required capacity to allow for an alarm load
being discharged in 30 minutes.
4.
Find the greater of Iq + In, or Ia. Calculate the power supply/charger requirement (Ic)
as follows and check that it is less than 3A. (If greater, a 6A charger is required).
Ic = I + Cap (5 hr)
24e where I is the greater of Iq + In, or Ia, and e is the charging
efficiency of the particular battery being used, at the current being used (typically
80%, i.e. (cap/24) x 1.25).
5.
Calculate the battery capacity as follows:
Cap (24 hr) = (24 x Iq + Ia) x 1.25
(See note 4 of Section 4.3.1 regarding the x 1.25 multiplier).
Select a battery which has a rated capacity (i.e. 20 hr rating) equal to or above that
just calculated. (Refer to Sections 3.3.3 and 4.3.4 for approved types).
4.3.3
EXAMPLE BATTERY/CHARGER CALCULATIONS
An example FP0781 FIP has the following configuration:
3 8ZMs total (i.e. 2 x FP0553 expansion modules fitted)
1 8RM fitted
20 AZCs enabled, 4 disabled
42mA total detector current on the 20 AZCs
350mA of door holders off +VNBF
5 relays on the 8RM used, with supervision enabled, all switching 24V, 50mA relays,
normally de-energised.
Ancillary relay 1 (on the MAF) switching a 24V, 100mA load
