The Pertronic Audio Distribution Module 4-Way (ADM-4) provides multiple independently controlled and monitored 100 Vrms audio lines (channels). This simplifies audio system installations by allowing multiple spurs from a single 100 Volt audio line without compromising the fault supervision system.
A system built with ADM-4 modules will continue operating even if some channels develop faults. If any channel becomes short-circuited, output on all channels will be interrupted. After a brief delay (about 20 seconds), the shorted channel will be disconnected. Output will then resume on the unaffected channels. The monitoring system will continue to monitor the shorted channel, and it will automatically reconnect the channel if the fault is cleared.
The built-in supervision system continually monitors the 100V output lines for open-circuit or short-circuit conditions, irrespective of whether the system is broadcasting an evacuation message, broadcasting non-urgent audio such as background music, or idling with no signal.
Each channel may be permanently enabled using the local DIP switch, or enabled / disabled by a remote control signal.
The Audio Distribution Module independently supervises the output channels and signals a fault condition to the amplifier or evacuation generator in the event of a fault condition. The module also includes a Form-C clean contact fault relay for connection to monitoring equipment.