ASL INTERCOM PS 279 Bedienungsanleitung PDF herunterladen (Seite 4)

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User Manual PS 279 / October 2013 © ASL Intercom BV

2.0 GENERAL DESCRIPTION PS 279

The PS 279 (19”/1RU) is designed to be a dual

channel master unit in an ASL intercom system.

To connect the unit to its remote stations, use

microphone cable with 2 wires and 1 shield.

Each channel has a Volume (listen level) control,

a TALK and a CALL button with LED indicators

and a side tone trimmer.

The intercom line power supply is fully protected

and can safely drive up to 20 Pro Series beltpacks

or 10 remote 2-ch speaker stations operating at

full power. In case the number of user stations

exceeds the capacity of the PS 279 power supply,

the PS 285 booster power supply can be used.

Since the power supply provides the line

impedance, one uses only one PS 279 in a 2-

channel system. Should the PS 279 be connected

to another Intercom system, the ‘System link’

connector at the rear of the unit has to be used to

avoid impedance problems.

Special attention has been paid to the intelligibility

of speech. By applying low noise/high speed op-

amps, a speech presence filter and a proprietary

headphone amplifier, communication is very

comfortable even in environments with a high

background noise level.

The unique CALL system provides both a flashing

red LED and a very distinctive and characteristic

sound signal. Only a short push of the CALL

button will make the LED flash. The Call sound

signal (buzzer) is activated by holding the button

for two seconds. In case the sound signal is

undesirable, all buzzers can be muted with the “All

buzzers on/off” button.

Fully electronic switching allows for “soft”

microphone on switching (latched or momentary)

and remote Mic Mute facility. All microphones of

stations connected to the PS 279 can be muted by

pushing a single button on the front panel.

An Aux input at the rear panel allows inserting

external audio signals at line level.

The Aux signal can be routed to intercom line A

and/or B, or directly to the local headset.

As an option, an XLR-6 headset connector can be

fitted, allowing to hear channel A + AUX program

signal on the left headset can and channel B +

AUX program signal on the right headset can

(“binaural use”).

By changing the position of internally mounted

jumpers, it’s also possible to hear channel A + B

on the left can and the AUX program signal on the

right can.

3.0 MAINS POWER & SAFETY EARTH

WARNING: This appliance must be earthed

The PS 279 may be connected to a mains power

outlet of 100 - 240 V AC (50 - 60 Hz), 100 watts.

The outlet should have a clean earth. Avoid using

mains power outlets which also power dimmer

controlled lighting equipment.

The wires in the mains lead are color coded:

Green/yellow: safety ground

Blue: neutral

Brown: live

In case the colors of the wires in the mains lead

do not correspond with the colored markings of

the terminals in your plug, proceed as follows:

• The wire that is colored green-and-yellow

must be connected to the terminal in the

plug, which is marked with the letter “E”, or

by the ground symbol, or is colored green.

• The wire that is colored blue must be

connected to the terminal that is marked

with the letter “N” or colored black.

• The wire that is colored brown must be

connected to the terminal marked with the

letter “L” or is colored red.

For personal safety and for proper functioning of

the PS 279 and connected stations the green-and-

yellow wire of the mains cord must always be

connected to the electrical installation safety earth

or ground. This wire is internally connected to all

exposed metal surfaces. Any rack framework into

which this unit might be mounted shall be

connected to the same grounding circuit.

The PS 279 employs professionally designed

input and output circuits which do not require the

disconnection the safety earth to avoid hum loops.

Powering up procedure:

• Make sure that the red power switch on the

left side of the front panel is OFF.

• Connect the power cord to the rear of the

station.

• Plug the other end of the power cord into a

PROPERLY GROUNDED outlet.

• Turn on the power with the red button. The

red overload LED will light up for about 3

seconds, then extinguishes and the green

power LED will switch on, indicating the

station is active.

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