Module for 100V PA lines.
To prevent PA loudspeakers in a secure area from being used as microphones,
the Speaker Isolation Module is installed within the secure area between
an incoming 100V speaker circuit and the speakers to be secured. The module
can also be used on 70V systems. In this case, the secure speakers will
also be driven at 70V.
The secured speakers are monitored for open and short circuits by the
use of a 56K End of Line (EOL) resistor. The EOL resistor used by the system
providing the 100V input signal does not need to be 56K. It can be what
ever value is required by that system.
Any faults are relayed by placing an 8.2K ohm resistor in parallel
with the input 100V line.
Multiple loudspeakers up to a maximum of 20 watts may be connected
to the 100V Isolated Output of the module. Up to 2 speaker circuits may
The load presented by the secure speakers (up to 20W max) is driven
by the amplifier driving the incoming 100V Input of this module. This module
does not have an inbuilt amplifier.
The module draws a maximum current of 70 milliamps at 28 volts and
is supplied from the MECP panel. The module does not need any additional
power supplies or batteries to be installed. The isolated output reproduces
all ISO tones and PA announcements. The Speaker Isolation Module has three
diagnostic LEDs to indicate status of the module which can be seen without
opening the enclosure. It is fully compliant with AS2220, AS1670.1-2004
||18 Volts – 28 Volts
|Quiescent Supply Current
||35mA at 28V
|Maximum Supply Current
||70mA at 28V (typ 60mA at 24V)
||2 watts Max (70mA at 28V) 0.8W quiescent
||Incoming 100V PA signal
||In parallel with 100V input. For connection of additional unsecured
|100V Isolated Output
||100V signal to secured speakers
||8.2K ohms in parallel with the input 100V line.
|Isolated Output EOL resistance
||56k ohms 2% Metal film resistor.
e.g. Altronics R7600
or Farnell (Element 14) 9469060
||W150mm x L110mm x D70mm
using the Speaker Isolation Module
Removes maintenance and inspection as required by AS1851 within secure
areas as the module does not require 240 volt field power supplies and
back up batteries as is the case with the alternate Audio Amplifier that
is utilized for this purpose.
Provides continuous monitoring of isolated speakers for fault conditions.
Easy to install on existing wiring.
Small unit that can be mounted any where within the secure area.
Diagnostic LEDS mounted on each module can be used by any service technician
to diagnose problems. eg loss of power, open and short circuit faults without
opening the enclosure.
Any number of speakers up to 20 watts can be connected.
The isolation module utilises existing power supply from the MECP. This
confines the maintenance to the MECP.
Does not have any significant heat source that requires additional ventilation.
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