ASL INTERCOM PS 278 Manual do utilizador - Página 2
Procurar online ou descarregar pdf Manual do utilizador para Sistema de intercomunicação ASL INTERCOM PS 278. ASL INTERCOM PS 278 16 páginas. Pro series dual channel master station
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1.0
GENERAL DESCRIPTION
The PS 278 is designed to be a master unit in an ASL
intercom system and can be used in portable as well as
fixed applications. It incorporates a dual channel intercom
line power supply, a dual channel headset station, an
audio input and uses only 1U of 19" rack space.
This makes the PS 278 very versatile and ideal for use in
applications where standard microphone cable is available
and ease of setup is of paramount importance.
Each channel has a Volume (listen level) control, a Talk
and a Call button with LED indicators and a sidetone
trimmer.
The intercom line power supply is fully protected and can
drive at least 20 beltpacks or 10 speaker stations, or a
combination, operating at full power. The power supply is
completely separated from all other functions and in case
of power failure the unit can accept line power from an
external ASL power supply.
Since the power supply provides the line impedance, only
one PS 278 should be used on the two channels. For
driving more beltpacks/speaker stations on these lines an
additional power supply booster (PS 285) is needed.
Special attention has been paid to the intelligibility of
speech. By applying low noise/high speed circuitry,
a speech presence filter and a specially designed high
power headphone amplifier, communication is very
comfortable even in environments with a high background
noise level.
2.0
UNPACKING
The shipping carton contains the parts listed below.
*
The PS 278
*
Power cable
*
Spare fuses
*
User manual
If any are missing contact your dealer.
With the PS 278 will be a small packet of spare fuses.
Please keep them in a safe place.
There is also one spare fuse included in the mains inlet.
3.0
MECHANICAL INSTALLATION
A vertical rack space of 1U (1.75", 44mm) is required for
the PS 278. It is not necessary to provide rear support by
extra bracing or shelving.
Adequate ventilation must be provided by allowing
sufficient space around the sides and rear of the unit to
ensure free circulation of air. Forced cooling is not
User Manual PS 278 / Issue 2 © 1996 ASL Intercom, Utrecht, Holland.
The unique ASL CALL system provides both a flashing red
LED and a very distinctive and characteristic sound signal.
Only a slight touch of the CALL button will make the LED
flash, whilst holding the button for two seconds will activate
the call sound signal. In case the sound signal is
undesirable, all buzzers can be muted with the front panel
'all buzzers on/off' button.
Fully electronic switching increases reliability and allows
for :
-
'soft' microphone ON switching, latched or momentary
-
remote Mic Mute facility. All microphones of stations
connected to the PS 278 can be muted by pushing a
single front panel button.
An Aux input on the rear panel, allows injecting external
audio signals of line or mic level. When 'mic level' is
selected, +30 V phantom power is available at the Aux
input connector.
An Aux signal can be routed to intercom line A and/or B, or
directly to the local headset.
As an option, a XLR-6 headset connector can be fitted,
allowing the user to hear channel A + AUX program signal
on the left headset can and channel B + AUX program
signal on the right headset can. 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.
ASL has taken great care to ensure that this product
reaches you in flawless condition.
After unpacking the unit please inspect for any physical
damage to the unit, and retain the shipping carton and
relevant packing materials for use should the unit need
returning.
If any damage has occured, please notify your dealer
immediately so that a written claim can be initiated. Please
also refer to the guarantee section of this manual.
required.
The power supply regulator is mounted on the rear of the
unit, and after a period of time it will feel hot to the touch.
This is quite normal, and should be no cause for alarm.
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