Technical / Programming Manual
FT128 Rev 2.2
41
5.4 Occupant Warning System (OWS)
5.4.1 Overview
Brooks OWS is an intelligent occupant warning system that can be incorporated in FT128
with number of options depending on the available space in the standard cabinet, larger
enclosures can be used to allow for more options.
Figure 16 Occupant Warning Display Module
The OWS is supplied with a wide range of high efficiency class-D audio amplifiers: 60, 120
or 250 Watts. A basic OWS system fitted in FT128 supports the following standard
Features:
Digital voice messages for alert and T3 (or AS2220 evacuation tone)
.
Supervised trigger Input (short/open circuit fault)
Supervised dual Strobe 24 VDC output for alert and evacuation strobes.
Supervised 100V speaker line output (open/short circuit fault).
Fault Relay output (changeover contacts)
Fault indicators for strobe output, trigger input and speaker circuit on OWS main
board. Only one common fault indicator on the front display.
Built in electret microphone.
Auxiliary input to connect to Brooks single or multiple zone remote microphones
Auxiliary audio enable/disable switch input.
An optional expansion 4 zone splitter board can be fitted with the standard OWS, maximum
of 4 boards can be used to provide up to 16 fully supervised speaker zone circuits.
The four zone splitter boards can be used to individually select one of the four zones (or all
zones) for PA announcement purposes only
. The PA front display can select up to 8 PA
zones and requires 2 x 4 zone splitter board.
5.4.2 Audio Amplifiers
60 Watt audio amplifier SUB865
120 Watt audio amplifier SUB866
250 Watt audio amplifier SUB867
In NZ applications, the OWS has to be configured to provide AS2220 tones and voice messages.
OWS faults are hardwired via this common fault relay to input I0 in FT128 to display OWS fault on the LCD.
The tone / message is common for all zones, only PA can select one or multiple zones for announcement.
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