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2.1 Installing the A 4567C Line Monitoring Unit (LMU)
The A 4567C is a Line Monitoring unit or LMU. A LMU monitors the condition of 100V PA speaker lines and alerts the user
when there is a problem with the speaker line wiring.
The unit is powered by the supplied 24V DC 1 amp plugpack which is connected to the 24V DC, 2.1mm Input Jack. If a
backup power supply is required, this is connected to the screw terminals marked 24V DC Backup as shown in Figure 3.
Up to 10 zones can be monitored and each zone has a LED indicator which indicates the condition of the zones'
speaker line. The output of the 100V Amplifiers are connected to the inputs on the rear of the A 4567C. All of the inputs
are isolated from each other so up to 10 amplifiers can be used or any combination below that number. e.g. One amplifier
connected to 2 or more inputs. NOTE : Never connect 2 or more amplifers to one zone as it will cause damage to the
A 4567C and the amplifiers.
The output terminals of the A 4567C are connected to the speaker lines. A maximum of 500 Watts of load per zone is
allowed, any more than this will damage the A 4567C. Any number of 100V line transformer/speaker combinations can
be used as long as the total load for each zone is below 500 Watts.
Figure 3 Illustrates how to connect the A 4567C. For the purposes of this example only zones 4 and 5 are shown con-
nected to amplifiers and speaker loads. One amplifier has been used to supply the audio to both zones, which is output
from the 100V output of the amplifier. There are many configurations available, one amplifier could be used for each zone
requiring 10 amplifiers or multiple zones could be connected to the same amplifier.
NOTE: Never connect two or more amplifiers to the same zone.
The speaker lines connected to output zone 4 and output zone 5, must be fitted with 100KΩ resistors at the end of the
lines and all speakers must have 22uF Bipolar caps fitted. See Figure 4 for more details. NOTE : The maximum wire run is
200 metres.
An A 4568 Fire Indicator Board Interface has been connected to the A 4567C via a Cat5e cable. The A 4568 has closing
contact outputs which are triggered when it receives fault information from the A 4567C. These closing contacts are
suitable for use on Fire Indicator Boards (FIB's).
The Combined 24V Out N/O contacts have been connected to the A 4576 Alarm Wallplate. When any fault condition
occurs on any zone of the A 4567C, 24 volts will become present at the Combined 24V Out N/O contacts and trigger the
A 4576 Alarm wallplate.
Optional
A 4568 LINE MONITOR FIB INTERFACE
A 4568 Fire Indicator
-
Board Interface
24V DC IN
24VDC
DC Fuse
Input
Manufactured in Australia By
Altronic Distributors Pty. Ltd.
www.altronics.com.au
-
+
(1A M205)
24V DC Plugpack
(such as M 9391 A
supplied)
24V DC Backup
www.redbackaudio.com.au
Fire Indicator Board
POWER FAIL
+
CONTACTS
1
2
3
4
TO A4567
CLOSED ON FAIL
POWER
DIP SW
ZONE 10
24V DC
Combined
Short
Open
Backup
Interface 1
24V Out
24V Out
24V Out
OUT 10
IN 10
All unused zones must be tted with a 100KΩ
-
+
A 4576 Alarm Wallplate
Power Supply
Redback
A 4567C 10 Zone Line Monitor
®
MODEL AC FUSE
A 4370
5A
OUTPUTS
A 4380
7.5A
100V
–
230V AC @ 50Hz
ZONE 9
ZONE 8
ZONE 7
ZONE 6
OUT 9
IN 9
OUT 8
IN 8
OUT 7
IN 7
OUT 6
IN 6
0.25W end of line resistor.
A 4576
Buzzer
Cancel
Press button to
cancel buzzer
Max wire run is 200 metres
Fig 3
Redback® Proudly Made In Australia
24V DC
INPUT
OUT
70V
4 -16Ω
Made in Australia by
24V DC
(1A Max)
Altronic Distributors Pty Ltd
www.altronics.com.au
–
–
+ _
RESETTABLE
FUSE
Rear of A 4567C
ZONE 5
ZONE 4
ZONE 3
ZONE 2
OUT 5
IN 5
OUT 4
IN 4
OUT 3
IN 3
OUT 2
All speakers must be tted
with 22uF Bipolar capacitors
and a 100KΩ resitor must be
fitted to the last speaker on
the line.
Speakers tted with 100V
line transformers.
Zone Ampli er
1 • Shield
1
2
2 • Hot
2
1
3
3
3 • Cold
VOLUME
LINE OUT
LINE IN
4
6
2
1
2
1
3
3
2
8
0
10
ZONE 1
IN 2
OUT 1
IN 1
5
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