ASL INTERCOM PS 430 User Manual download pdf (Page 2)

1.0 GENERAL DESCRIPTION

The PS 278 is designed to be a master unit in an ASL The unique ASL CALL system provides both a flashing red

intercom system and can be used in portable as well as LED and a very distinctive and characteristic sound signal.

fixed applications. It incorporates a dual channel intercom Only a slight touch of the CALL button will make the LED

line power supply, a dual channel headset station, an flash, whilst holding the button for two seconds will activate

audio input and uses only 1U of 19" rack space. the call sound signal. In case the sound signal is

This makes the PS 278 very versatile and ideal for use in 'all buzzers on/off' button.

applications where standard microphone cable is available

and ease of setup is of paramount importance. Fully electronic switching increases reliability and allows

Each channel has a Volume (listen level) control, a Talk - 'soft' microphone ON switching, latched or momentary

and a Call button with LED indicators and a sidetone - remote Mic Mute facility. All microphones of stations

trimmer. connected to the PS 278 can be muted by pushing a

The intercom line power supply is fully protected and can

drive at least 20 beltpacks or 10 speaker stations, or a An Aux input on the rear panel, allows injecting external

combination, operating at full power. The power supply is audio signals of line or mic level. When 'mic level' is

completely separated from all other functions and in case selected, +30 V phantom power is available at the Aux

of power failure the unit can accept line power from an input connector.

external ASL power supply. An Aux signal can be routed to intercom line A and/or B, or

Since the power supply provides the line impedance, only

one PS 278 should be used on the two channels. For As an option, a XLR-6 headset connector can be fitted,

driving more beltpacks/speaker stations on these lines an allowing the user to hear channel A + AUX program signal

additional power supply booster (PS 285) is needed. on the left headset can and channel B + AUX program

Special attention has been paid to the intelligibility of of internally mounted jumpers, it's also possible to hear

speech. By applying low noise/high speed circuitry, channel A + B on the left can and the AUX program signal

a speech presence filter and a specially designed high on the right can.

power headphone amplifier, communication is very

comfortable even in environments with a high background

noise level.

undesirable, all buzzers can be muted with the front panel

for :

single front panel button.

directly to the local headset.

signal on the right headset can. By changing the position

2.0 UNPACKING

The shipping carton contains the parts listed below. ASL has taken great care to ensure that this product

* The PS 278 reaches you in flawless condition.

* Power cable After unpacking the unit please inspect for any physical

* Spare fuses damage to the unit, and retain the shipping carton and

* User manual relevant packing materials for use should the unit need

If any are missing contact your dealer. returning.

With the PS 278 will be a small packet of spare fuses. If any damage has occured, please notify your dealer

Please keep them in a safe place. immediately so that a written claim can be initiated. Please

There is also one spare fuse included in the mains inlet. also refer to the guarantee section of this manual.

3.0 MECHANICAL INSTALLATION

A vertical rack space of 1U (1.75", 44mm) is required for required.

the PS 278. It is not necessary to provide rear support by

extra bracing or shelving. The power supply regulator is mounted on the rear of the

Adequate ventilation must be provided by allowing This is quite normal, and should be no cause for alarm.

sufficient space around the sides and rear of the unit to

ensure free circulation of air. Forced cooling is not

unit, and after a period of time it will feel hot to the touch.

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ASL INTERCOM PS 430 User Manual Page 2

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