Asl intercom PS 285 User Manual
PRO SERIES
USER MANUAL
FOR THE
PS 285
POWER SUPPLY BOOSTER
PS 285
Power
Supply
Booster
over
load
Power
On Standby On Standby
CHANNEL A CHANNEL B
CONTENTS
1.0 GENERAL DESCRIPTION..........................................3
2.0 UNPACKING...............................................................3
3.0 MECHANICAL INSTALLATION...................................3
4.0 MAINS POWER ..........................................................4
5.0 SET-UP.......................................................................4
6.0 FRONT PANEL CONTROLS.......................................5
7.0 REAR PANEL CONTROLS AND CONNECTORS.......6
8.0 CABLING.....................................................................7
9.0 PARTY LINE, TECHNICAL CONCEPT .......................8
10.0 GUARANTEE..............................................................8
11.0 TECHNICAL SPECIFICATIONS..................................8
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
Pro series
Intercom
2
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
1.0 GENERAL DESCRIPTION
The PS 285 is designed for use as an auxiliary 2-channel
power supply unit, should the main power supply of an
ASL intercom system be insufficient to drive the required
number of stations.
The unit has to be placed in a network in such a way that
it feeds its own group of user stations.
The PS 285 can be used in portable as well as fixed
applications. It uses only 1U of 19” rack space.
The unit is very versatile and ideal for use in applications
where standard microphone cable is available and ease of
set-up is of paramount importance.
2.0 UNPACKING
The shipping carton contains the parts listed below
* The PS 285
* Mains power cable
* Spare fuses
* User manual
If any are missing, contact your dealer.
With the PS 285 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 285. 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
required.
The intercom line power supply is fully protected and is
capable of safely driving 20 beltpacks or 10 speaker
stations, or a combination of the two, operating at full
power.
Fully electronic switching increases reliability and allows
for remote Mic Mute facility.
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 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 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.
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands. 3
4.0 MAINS POWER
The PS 285 may be connected to the mains
power outlet to which other audio equipment is
connected. The outlet should have a clean earth.
Avoid using mains power outlets which also power
dimmer controlled lighting equipment.
This appliance must be earthed
WARNING
4.1 SAFETY EARTHING
The green-and-yellow wire of the mains cord
must always be connected to the electrical
installation safety earth or ground. It is
essential for personal safety as well as for
proper operation of the PS 285 and the other
connected stations. This wire is internally
connected to all exposed metal surfaces and
any rack framework into which this unit might
be mounted is assumed to be connected to
the same grounding circuit.
4.2 POWERING UP
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.
The PS 285 employs professionally designed
audio input and output circuits which do not
require the disconnection of any safety earth for
the avoidance of hum loops.
Turn on the power with the red button. The red
-
overload LED will light up for about 3 seconds, then
extinguishes. The yellow LEDS will go on, indicating
the station is standby.
When a powered partyline is connected to the
-
intercom line input the green LED will go on,
indicating the station is active.
See for further installation and operation the concerning
sections.
5.0 SET-UP 5.1 REMOTE CONTROLLED STANDBY MODE
When the main power supply has reached its limit, a
PS 285 can be used to feed another group of user
stations. Make sure the unit is placed correctly.
When, for example, 30 beltpacks are needed, they
should be equally devided between the main power
supply and the PS 285. The booster should be placed
in the middle of the chain of user stations.
Refer to page 10 for an example of a 2-channel
intercom network with a booster.
4
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
This feature enables the user to activate or de-activate
the PS 285 with the power on/off switch of the main
power supply. The standby LED’s on the front panel
illuminate if there is no line power (from the main power
supply) available at the input connectors. The PS 285
will not supply power until the standby mode has been
released by providing line power at the input.
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