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5 System Description
5.1 Emergency Warning System
The EWS subdivides the building into evacuation zones. Each evacuation zone has one or more
amplifiers and a number of associated speakers. In sections of a building where the background noise
is high, visual warning devices may be used in addition to speakers. Each evacuation zone amplifier
may be switched by the system to one of four audio channels. These channels are PA, Alert signal,
Evacuation signal and Background music (BGM). The BGM channel to each amplifier can be configured
on site by jumper links to one of the following sources:
➢ Background music 1
➢ Background music 2
➢ Silence
During non-emergency situations the evacuation zones can have the PA channel or BGM channel
switched to allow the EWS to be used for PA facilities or background music. The background music is
disabled;
➢ in an emergency situation,
➢ if the EWS is manually operated; or
➢ if the mains power fails.
The tone generator (TG) is responsible for generating the alert and evacuation signals as well as the
alert and evacuation verbal messages.
The EWS has two possible types of alarm signal inputs to indicate that an emergency condition is
occurring in the building. These are:
➢ Emergency Alarm Initiating Devices (EAID's) i.e. manual call points
➢ Fire Alarm Control Panel (FACP)
These inputs are grouped according to the building evacuation zones. Any number of EAID's and
FACP's inputs may be assigned to any one building evacuation zones or group of zones.
When an input, i.e. EAID or FACP initiates an alarm signal the EWS, if in automatic mode, will initiate
a preset evacuation sequence. The evacuation sequence will sound the Alert / Evac signals to the
evacuation zones within the building and activating the visual warning devices (if installed) according
to the pre-programmed evacuation sequence.
The EWS provides full system status and fault indication facilities.
If the EWS has more than one ECP, one ECP is referred to as the Master Emergency Control Panel
(MECP) and the remaining ECP's are referred to as Secondary Emergency Control Panels (SECP's).
5.2 Emergency Intercommunication System
The EIS provides an independent communication system between the controlling ECP and a Warden
Intercommunication Point (WIP). EIS features are:
➢ The controlling ECP can call individual WIP's or enter an All Call mode, where all the WIP's
are called simultaneously.
➢ The controlling ECP and up to 5 WIP's can communicate in a conference mode.
➢ Calls to an individual WIP's have full duplex communication.
➢ All Call, communication is half duplex from the controlling ECP.
➢ Any WIP can call the controlling ECP the call is answered at the controlling ECP at the
operators' discretion.
MAN1813-9
4
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