• Signal Muting:
A signal muting facility is supplied,
consisting of a DCPO signal relay
which has all contacts brought out to
the ‘SIGNAL MUTE’ terminal group.
The actual muting can be achieved in
several ways depending on the system
requirements, although typically the
signal (from tuner, tape deck, etc.) would
be connected to the common terminal
(C-1) and the normally open terminal
(N\0-1). When the mute relay is activated
the contacts close and the signal is short-
circuited. It is important to check that
the signal source from the tuner, tape
deck, etc., is suitably buffered so that
shorting-out the signal will not damage
the source. If in doubt, the relay contacts
should be configured to open circuit the
signal to the amplifier.
As there are two sets of contacts
available, several muting arrangements
are possible. These include muting
balanced signals, muting two separate
signals or using one set of terminals to
trigger a chime.
Activation is achieved by connecting
the MUTE terminal to the 0v terminal on
the zone select terminal group, visual
indication of operation being given by
LED6 ‘MUTE’.
• Signal Wiring point:
When wiring a multizone microphone
these terminals can be used as a neat
and convenient wiring point for the
microphone signal. These can then be
wired to the amplifier mic input.
• DC OUT:
A 24 volt DC fused supply is available
from the Unit, and is suitable for
powering ancillary equipment such as
multizone consoles, line amplifiers, tone
generators, etc. The current available is
limited to 100mA by a fuse (F2).
• DC IN:
The ZSU can be powered from an
external 24 volt power supply via these
terminals. The Unit has reverse current
protection, so that both the mains supply
and the external 24v can be connected
at the same time (e.g. when used in
systems requiring battery backup).
• MAINS INPUT:
Connect the mains input to the ‘L’, ‘N’
and ‘E’ terminals and ensure that the
supply cord is held firmly in place by the
cable clamp adjacent to the terminals.
The Unit is supplied with a standard input
voltage of 240v 50/60 Hz, although it can
be supplied with a 120v 50/60 Hz input
as an option.
• WARNING:
Under no circumstances should any
wiring be carried out to the unit while the
mains power is connected.
4
Description:
