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The Pertronic 50W Amplifier (EVAC50W24V) is an evacuation amplifier with integral evacuation tone and message generator, designed for use in fire alarm systems with supervised 100 Volt-Line audio distribution. The amplifier delivers up to 50 Watts of audio power to the 100 Volt-Line.

The EVAC50W24V is able to generate up to three pre-configured tones. An optional pre-amplifier provides local microphone and remote audio inputs.

Each of the amplifier’s three tones can be selected from 47 available options. The factory default tones are: NZS 4512:2010 Evacuation signal, with verbal message; NZS 4512:2010 Alert signal with verbal message; and a Simulated Bell tone. The third tone provides for non-emergency applications. For example, in a school, the third tone may signal start and finish times for classes.

There are three methods of controlling tone output from the amplifier:

1. The external RS-485 bus from any Pertronic analogue addressable fire alarm panel activates any one of the three pre-configured tones
2. Switch or relay contacts connected to the amplifier’s TONE CONTROL inputs are able to activate any one of the three pre-configured tones
3. A positive DC voltage applied to the amplifier’s BELL input activates one selected tone

An optional microphone pre-amplifier provides a local microphone input (MIC) and press to talk (PTT) control. The PTT may be configured to silence the integral tone generator. Alternatively, the tone generator may be configured to over-ride the MIC and PTT inputs. The pre-amplifier also has a line level input for connecting an external audio source.

When not broadcasting audio, the amplifier continuously checks for faults on the 100 Vrms line by driving a small DC current through the output wiring, which must be correctly terminated with an end of line resistor. It is important to note that every speaker connected to the supervised 100 Volt-Line must incorporate a DC-blocking capacitor.

Features

• Default Alert and Evacuation tones with verbal messages as in NZS 4512:2010
• Each of the amplifier’s 3 tones may be chosen from 47 available options, configurable using on-board rotary and DIP switches
• Verbal message duration: up to 20 seconds
• Custom tones and / or messages available on special order
• Delivers up to 50 W to connected speakers
• Optional pre-amplifier suitable for public address microphone or fire microphone
• Operates from 24 Volt (nominal) DC power
• Controllable by panel RS-485 bus, TONE CONTROL inputs, or BELL input
• Overload and short-circuit output protection
• Fault (DEFECT) LED displays a pattern of short and long flashes to identify any faults that have been detected
• Supervisory system operates when not broadcasting audio and can detect:
  • Short and open-circuits on the 100 Volt-Line
  • Power supply faults
  • Overload conditions
  • Low power output
  • RS-485 communication faults
  • Missing pre-amp (if appropriate)

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