F3200/NDU AS4428.1 Installation Manual
Document No: LT0255
Configuring a FIP
Page 4-8
5 July 2016
Issue 1.22
POWERING AN F3200 FROM AN EXTERNAL DC SUPPLY
To comply with AS1670.1 F3200 uses a 240Vac supply as the primary power source and
back-up batteries as the secondary power source. However the F3200 may be powered
from an external dc supply. This must be battery backed, or have another form of secondary
source to comply with AS1670.1. The supply must provide a voltage and current within
F3200’s operating range (preferably 25-27Vdc).
The following wiring instruction connects the dc supply voltage onto the ac (low voltage)
input so that the Mains on LEDs on both the MAF/PSU and Controller PCBs are illuminated.
Because this signal is not ac, the Controller interprets that as a ‘Mains Fail’ condition and
automatically disables the charger monitoring and automatic battery test, so that the latter
does not have to be disabled by programming (but can be if desired).
With no mains (ac) present the real time clock (RTC) on the Controller Display will use the
crystal time base instead of mains 50Hz and will therefore not be as accurate.
WIRING
Disconnect the secondary wires of the transformer from the AC IN tabs on the MAF/PSU.
Cable tie them safely out of the way (if the mains is not connected they will not be live).
Connect the DC supply
–ve to the BATTERY – terminal, and the +ve to the B
and, if the mains power on LED is to be lit to the J3/1 AC IN tab on the MAF/PSU. This
requires a 2mm crimp receptacle (or alternatively may be soldered and preferably covered
with sleeving).
If the maximum alarm load can be greater than 3.5Adc, but less than 7A, fit a second PTC
(Vigilant part RR0917) to the R43 position on the MAF/PSU (adjacent to the existing PTC,
R42). If the alarm load can be greater than 7A then short out the PTCs (connect TP16 to
TP11) and fuse the external supply with a sufficient rating to meet the maximum alarm load,
but not so high as to not blow on a short circuit or wiring fault.
The +VNBF output (J7A) must not be used.
CURRENT CALCULATIONS
Add an extra 80mA to the stated F3200 quiescent and alarm currents if the connection to the
J3/1 AC IN terminal is made.
PROGRAMMING
With an external DC supply the F3200 should be programmed with mains disabled and
“Fault after 8 hours of Mains Fail” also disabled.
With default programming, a Battery Low Fault will occur if the supply voltage falls below the
specified threshold. This may be disabled by programming. (The installer must consider the
requirements for a fault warning at 50% of battery capacity).
