Altair EF-200, Owner'S Manual

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12
E-200 SERIES INTERCOM SYSTEM — EF-200 DUAL CHANNEL MASTER STATION
RELAY JACK ¼ ”
COMMON TIP
NORMALLY CLOSE RING
NORMALLY OPEN SLEEVE
In the factory configuration, the PA output relay is activated with the PA output switch, but the
multipurpose relay can be configured to be activated upon activating the channel A and/ or B
microphone or upon activating the remote mute — buzzers signal. In order to obtain more
information, consult the special operation section.
NOTE: The NORMALLY CLOSE terminal is joined with the COMMON terminal when the PA output is
not activated, and the NORMALLY CLOSE is joined with the COMMON terminal when the PA output
is activated.
EXTERNAL UNITS CONNECTION
The external units connection to the master station is carried
through twin-lead shielded cable and XLR-3-31/ XLR-3-32
connectors. Each master station channel provides two XLR-3-31
connectors and a XLR-3-32 connector wired internally in parallel
mode.
The next list shows the signal distribution in the pin XLR
connectors.
XLR-3-31/ XLR-3-32 — INTERCOM LINE
PIN 1
GND
PIN 2 +VDC
PIN 3
SIGNAL
Certain rules have to be followed when installing the cables of an intercom system. This is to
avoid ground loops and to minimize the power loss and the possible effect of electromagnetic
fields.
Do not connect the XLR pin 1 to the XLR metal housing or to metal wall boxes to avoid ground
loops. The ground loop could increases notably the system background noise.
Do not close the intercom line connection (avoid closed loops). Each intercom line leaves from
the master station towards the remote stations, but it does not return to the master station. If the
connection is closed, a ground loop with the increase from the system noise will take place.
Use high quality cables and minimize its longitude. The DC resistance of a low quality cable or
very long affects to the power consumption, the channels crosstalk and the system frequency
response.
Place the master station the closest possible to the maximum consumption zone; that is to say
to the zone in which more external units are placed.
The next picture shows the habitual connection of an intercom system formed by four
beltpacks units (two for each channel) and a master station EF-200. In the section APPLICATION
EXAMPLES are shown another type of connections.
TIP.
RING.
SLEEVE.
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