F3200/NDU AS4428.1 Installation Manual Document No: LT0255
Applications
Page 6-18 30 June 2004 Issue 1.04
6.2.5.2 Original AVI
Original AVIs (FP0628) have three pairs of terminals that accept signals from the FIP,
namely '+24V', 'ALERT-', and 'EVAC-'. They can be connected and operated in two modes,
namely 2-wire and 3-wire.
The typical connection for 3-wire mode has the +VBF supply connected to +24V, with
switched 0V signals to ALERT- and EVAC- respectively, as was used on the original gas
control doors (ME0005 – ME0069 see drawing 1931-47).
In 2-wire mode, the +24V terminals are not used. For an EVAC input, the +ve supply is
connected to ALERT- (i.e EVAC+) and the -ve supply (0V) is switched to EVAC-, and vice
versa for Alert. Note the System Inoperative sign is configured for 3 wire special mode, but
only two wires are required.
However these arrangements do not support supervision of the wiring to the AVIs. For
supervised outputs the recommended method is to use only AVI MK2s and convert the
ME0065 – ME0069 gas control door to a common 0V and switched 24V outputs – refer
Section 6.2.6.
All signs should be configured for flashing illumination as that attracts attention and saves
power. Note the original AVI has incandescent lamps that draw a large current.
The configuration of some commonly used signs is as follows.
Function Illuminate Tone Note
1 Top: FIRE ALARM Top Alert
Bottom: EVACUATE AREA Both Evac
2 Top: FIRE ALARM Top Alert
Bottom: DO NOT ENTER Both Evac
3 Top: DO NOT ENTER Top Evac a.
Bottom: XXXX GAS DISCHARGE Both Evac a.
4 Both: XXXX SYSTEM INOPERATIVE Both None
Function Input Lamps Tone Mode DIL SW
On
DIL Sw
Off
Lk1,2 Lk3 Lk6 Notes
1 Alert-
Both
Top
Both
Alert
Evac
3-wire
std
1,3,5,6 2,4,7,8 1-2 1-2 On
2 Alert-
Both
Top
Both
Alert
Evac
3-wire
std
1,3,5,6 2,4,7,8 1-2 1-2 On
3 Evac- Both Evac 2-wire
2,3,5,6 1,4,7,8 2-3 1.2 Off b.
4 Alert- Both None 3-wire
spcl
1,3,5,6,
8
2,4,7 1-2 2-3 On
Notes
a. The option of top lamps with Evac tone for one input, and both lamps with Evac tone
for the other, is not directly supported. But it can be arranged by mounting the AVI
upside down.
b. For this configuration the +ve supply is wired into Alert-, not +24V.
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