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1.1 INTRODUCTION
Specifically designed to monitor the condition of 100V line speaker systems in emergency paging and fire evacuation
installations. Many large commercial installations have speaker circuits in excess of 250W. Traditional line monitoring units
were limited to 50W per zone and would not handle this load. The A 4567C can handle loads up to 500W per zone. The
microprocessor controlled circuit continuously monitors loudspeaker lines for normal, open or short circuit condition. A
multi-colour LED indicates line condition accordingly for each zone. Internal audible alarm buzzer with cancel button is
fitted. With any fault condition, a switched output is provided for remote monitoring purposes. This is a switched to
ground signal. Three outputs are supplied. One for short circuit conditions. One for an open circuit fault. Plus a combined
output for any fault condition. The system can be configured to operate with multiple amplifiers
1.2 FEATURES
• Monitors 10 zones @ 500W max per zone
• Monitors normal, open and short circuit conditions
• Switched output for remote monitoring
• Pluggable terminals for all connections
• 10 Year Warranty
• Australian Designed and Manufactured
1.3 WHAT'S IN THE BOX
A 4567C Line Monitoring Unit
MA8241 24V 1A plugpack
Instruction Booklet
1.4 FRONT PANEL GUIDE
Figure 1 shows the layout of the A 4567C front panel.
Zone 1
Zone 2
Zone 3
1
Zone Indicators
These LED's indicate the status of each of the 10 zones.
2
Zone Status Indicator Legend
The legend outlines the status of the 10 zones. Green indicates a "Normal" condition on the zone. Orange
indicates an "Open" condition on the zone. i.e. the speaker line has a break somewhere on the line. Red
indicates a "Short" condition. i.e. there is a short circuit on the line.
3
Buzzer
The buzzer sounds when either an "Open" or a "Short" condition occurs on a zone.
4
Cancel Buzzer Button
This button is used to cancel the buzzer from sounding. Note: This does not turn off the fault indicator/s.
5
On indicator
Indicates when the unit has power.
6
Power Switch
Used to turn on the unit. Note: The 24V DC backup input bypasses the power switch.
www.redbackaudio.com.au
Redback
Zone 4
Zone 5
Zone 6
Zone 7
1
A 4567C 10 Zone Line Monitor
®
Normal
Zone 8
Zone 9
Zone 10
Open
Short
Status
2
Fig 1
Redback® Proudly Made In Australia
A 4567C
Line Monitoring Unit
Cancel
On
Buzzer
3
4
5
Power
6
3
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