A 4567C • Line Monitoring Unit 10 Zone

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. Dimensions: 482 x 152 x 44mm.

Key Features:

• 1U 19″ rack mount
• Monitors 10 zones @ 500W max
• Configurable for use with 1 to 10 individual amplifiers. ie 1 amplifier per zone/circuit or 1 amplifier per many zones/circuits.
• Monitors normal, open and short circuit conditions
• Switched output for remote fault monitoring
• Pluggable terminals for all connections
• 24V dc operation
• Includes Power Supply

Wiring Requirements
This unit is designed for “loop in loop out” serial wiring to loudspeakers with a 47KΩ terminating resistor at the end of the line. Star wiring or tee offs are prohibited. Each loudspeaker requires a series connected 22µf bipolar capacitor for correct operation. A delay of 10 seconds is provided before registering a fault to minimise false alarms.

A 4568 Zone Status Interface
With the addition of the A 4568 you are able to monitor the status of each individual zone. The interface can be set up to monitor each zone in two ways. 1. LED status indicates normal or fault (no distinction between open or short). 2. LED status indicates either short or open. Connection between the A 4567C and A 4568 is via a Cat 5e patch lead. Screw terminals are provided for each zone.