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12.17 Occupant Warning Systems
The OWS system is intended to broadcast information (voice announcements for emergency
purposes, alert signals, evacuate signals, visual and tactile warning devices) to provide warning to the
occupants within one or more specified areas in an emergency, to effect a rapid and orderly
mobilisation of occupants in an indoor or outdoor area.
This OWS system consists of the Amplifier (25W, 50W, 120W, 250W and 500W variants) and a Front
Panel Switch and Indicator Card.
The amplifier communicates to the Front Panel Switch & Indicator via a CAN protocol, where input
events are received from the Front Panel Switch & Indicator board and feedbacks are returned to it.
The Front Panel Switch & Indicator
communicates to the FACP via the FACP’s internal RS485
communications bus.
Below are some of the features the OWS contains. For detailed specifications and functional
information refer to MAN3072 OWS Technical Manual.
12.17.1
Amplifier Board (25W and 50W)
The Amplifier features 4 digital inputs, 3 relay outputs (1A), a strobe output and a 100V line output.
Figure 115: Amplifier Board
The Digital input functions are as follows:
Input 1(+/-)
Bell Input (FIB)
Active high input. Tie to 24V to activate (non-
latching); 10k
Ω load opens on fault;
(Connect to FireFinder and ZoneSense Plus
FACP’s Warning System Output)
Input 2
Reset or Evacuate
(Default = Reset)
Active low input. Short to 0V to activate (non-
latching).
Input 3
Silence or Alert
(Default = Silence)
Active low input. Short to 0V to activate (non-
latching).
Input 4
External Fault or Custom Tone 400/450Hz @
0.5Hz
(Default = External fault input)
Active low input. Short to 0V to activate (non-
latching).
Note:
The digital inputs are not necessary when using the Front Panel Switch & Indicator board in
the FireFinder Plus.
The Relays are rated to 1A and function as follows:
Summary of Contents for FireFinder PLUS
Page 1: ...FireFinder PLUS ...
Page 4: ...FIRE BRIGADE RESPONSE GUIDE ...
Page 99: ...Page 92 12 17 3 Panel Interfacing ...
Page 127: ......