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8.5.7 Main CPU
The Main CPU is responsible for the total control of the EWS and EIS, the communication with other
ECP's, remote paging consoles, FireFinder and houses the program module.
The Main CPU has an Address setting that is factory set by way of a dipswitch. It also has another
dipswitch which controls the time from alert to evacuation modes whilst in automatic. This time can
be adjusted on site if required.
8.5.7.1 Program Eprom's
The EPROM's are located on the Main CPU and are responsible for the zoning of the FACP and EAID
inputs and are programmed for each building.
The type of evacuation sequence and the outputs for the visuals are also controlled by the program
EPROM's.
8.5.8 Amplifier Rack Frame
Each Amplifier Rack Frame houses eight (8) 40 Watt zone amplifiers or four (4) 120 Watt amplifiers.
Each frame has a motherboard (302-4760) which provides all necessary connections for the amplifiers
as well as providing the address information required by the amplifiers to allow any zoning
requirements. A complete list of all amplifier addresses can be found in Appendix B. Zone numbering
is from the bottom frame left hand side upwards.
BGM Linking Options
Each zone amplifier can be connected by way of links to broadcast one of two BGM inputs. The links
for this facility are found on the rear of the 302-4760 PCB. Refer to the Table and Figure below
Selection
Un-even LK No's 1-13
No Music
Not Fitted
Music 1
1-2
Music 2
2-3
C N 8
c
a
CN12
5 4 3 2 1
5 4 3 2 1
A
A
B
B
AMPLIFIER
AMPLIFIER
ADDRESS
ADDRESS
KEY
KEY
MUSIC
1
1
2
2
AUX
3
3
LK16
LK15
8.5.9 40-Watt Amplifier
The 154-0075 (40W) monitored amplifier provides a 100V line output, all necessary circuitry to
interface to the EWS and the attenuation for the Alert signal as required in AS2220. Minimum line
impedance is 250Ω.
Each amplifier is provided with a level adjustment allowing adjustment of output level to each EWS
zone.
C N 6
C N 7
c
a
c
a
5 4 3 2 1
CN11
A
5 4 3 2 1
B
A
AMPLIFIER
B
ADDRESS
AMPLIFIER
ADDRESS
KEY
CN16
KEY
D7
D5
D6
MUSIC
MUSIC
1
1
1
1
2
2
CN17
2
2
AUX
FAULT
3
3
OUTPUT
AUX
3
3
LK14
LK13
5-8
LK12
LK11
AUX
INPUTS
5-8
THIS SECTIONS ADDRESS KEY
& MUSIC LINKS ENLARGED
FOR EXPLANATION PURPOSES
Figure 10: Amplifier Mother Board
Even Link No's 2-14
Not Fitted
1-2
2-3
C N 5
C N 4
c
a
c
a
5 4 3 2 1
A
A
B
B
AMPLIFIER
ADDRESS
KEY
D4
MUSIC
MUSIC
1
1
1
1
2
2
2
2
AUX
3
AUX
3
3
3
LK9
LK7
LK10
LK8
MAN1813-9
C N 3
C N 2
c
a
c
a
CN10
302-476 B
5 4 3 2 1
5 4 3 2 1
CN13
A
A
B
B
AMPLIFIER
AMPLIFIER
ADDRESS
ADDRESS
CN15
KEY
KEY
D3
MUSIC
MUSIC
1
1
1
1
2
2
2
2
CN14
AUX
FAULT
3
AUX
3
3
3
OUTPUT
LK6
LK5
LK4
LK3
1-4
AUX
INPUTS
1-4
C N 1
c
a
C N 9
5 4 3 2 1
AMPLIFIER
ADDRESS
KEY
MUSIC
1
1
2
2
AUX
3
3
LK2
LK1
20
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