Asl intercom PS 279 User Manual

PRO SERIES
USER MANUAL
FOR THE
PS 279
CONTENTS
1.0 SAFETY INSTRUCTIONS……………………………….3
2.0 GENERAL DESCRIPTION ......................................... 4
3.0 UNPACKING .............................................................. 4
4.0 MECHANICAL INSTALLATION .................................. 4
5.0 MAINS POWER .......................................................... 5
6.0 FRONT PANEL CONTROLS ...................................... 6
7.0 REAR PANEL CONTROLS ........................................ 8
8.0 INTERNAL CONTROLS ............................................. 9
9.0 CABLING .................................................................. 10
10.0 PARTY LINE, TECHNICAL CONCEP T .................... 11
11.0 WARRANTY ............................................................. 11
12.0 DESIGN CRITERIA .................................................. 11
13.0 TECHNICAL SPECIFICATIONS ............................... 12
User Manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands.
2 User manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands

1.0 IMPORTANT SAFETY INSTRUCTIONS !

Please always follow these instructions t o he lp ensure
against injury to yourself and da m age t o t he system.
Read all safety and operating instructions
1) before you operate the apparatus.
Retain all safety and operating instructions for
2) future reference.
Heed all warnings on the apparatus and in the
3) safety and operating instructions.
Follow all installation, operating and use
4) instructions.
Unplug the apparatus from the AC power
5) outlet before cleaning. Use only a damp cloth for cleaning the exterior of the apparatus.
Do not use accessories or attachments not
6) recommended by the manufacturer, as they may cause hazards an d vo id the warr anty.
Do not operate this apparatus in high
7) humidity areas or expose it to water or moisture.
Do not place the apparatus on an unstable
8) cart, stand, tripod, bracket or table. The apparatus may fall, causing serious personal injury and damage to the apparatus.
Do not block or cover any openings in the
9) apparatus. These are provided for ventilation and protection from overheating. Never place the apparatus near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not place the apparatus in an enclosure such as a cabinet without proper ventilation.
Operate the apparatus using only the type of
10) power source indicated on the marking label. Unplug the apparatus’ power cord by gripping the power plug, not the cord.
Insert the plug properly. Do not defeat the
11) safety purpose of the polarized or grounding­type plug. A polarized AC line plug has two blades with one wider than the other. This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug still fails to fit, contact an electrician to replace the obsolete outlet. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician to replace the obsolete outlet.
Route power supply cords so that they are not
12) likely to be walked on or pinched by items placed upon or against them. Pay particular attention to cords at plugs, convenience receptacles, and the point where they exit from the apparatus.
Do not overload wall outlets or extension
13) cords, as this can result in a risk of fire or electrical shock.
Unplug this apparatus during lightning storms
14) or when unused for long periods of time.
Never insert objects of any kind into the
15) apparatus through openings, as the objects may touch dangerous voltage points or short out parts. This could cause fire or electrical shock.
Refer all servicing to qualified service
16) personnel. Servicing is required w he n the apparatus has been damaged in any way, such as when the power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
User manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands 3
2.0 GENERAL DESCRIPTION
The PS 279 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 with auxiliary input, a dual channel headset station and uses only 1U of 19” rack space.
This makes the PS 279 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 side tone trimmer.
The intercom line power supply is fully protected and can drive at least 20 beltpacks operating at full power. The power supply is completely separated from all other functions and in case of power failure, the unit will accept line power from an external ASL power supply.
Since the power supply provides the line impedance, one would generally only use one PS 279 on a 2-channel Intercom system. Should you want to connect a PS 279 to another Intercom system, the ‘System link’ connector at the back of the unit has to be used to avoid impedance problems. If the number of beltpacks/speaker stations exceed the capacity of the PS 279 power supply, a booster power supply (PS 285) can be used.
3.0 UNPACKING
The shipping carton contains the parts listed below * The PS 279 * Mains power cable * Spare fuses * User manual
If any are missing, contact your dealer. With the PS 279 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.
4.0 MECHANICAL INST ALLATION
A vertical rack space of 1U (1.75”, 44mm) is required for the PS 279. It is not necessary to provide rear support by extra bracing or shelving.
Adequate ventilation must be provided by allow ing sufficient space around the sides and rear of the unit to ensure free circulation of air. Forced cooling is not required.
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.
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) will be activated when 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 increases reliability and allows for:
- “soft” microphone ON switching, latched or momentary
- remote Mic Mute facility. All microphones of stations connected to the PS 279 can be muted by pushing a single front button.
An Aux input at the rear panel allows injecting external audio signals at line level. An 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 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 nee d returning.
If any damage has occurred, please notify your dealer immediately so that a written claim can be initiated. Please also refer to the guarantee section of this manual.
The power unit is mounted on the bottom of the unit, and after a period of time it will feel hot to the touch on top and bottom. This is normal, and should be no cause for alarm
4 User manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands
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