Asl intercom PS 280 User Manual

PRO SERIES

USER MANUAL

FOR THE

PS 280

DUAL CHANNEL POWER SUPPLY

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 1

2.0 UNPACKING ................................. 1

3.0 MECHANICAL INSTALLATION ................... 1

4.0 MAINS POWER ............................... 1

5.0 FRONT PANEL CONTROLS ..................... 3

6.0 REAR PANEL CONTROLS AND CONNECTORS .... 3

7.0 CABLING .................................... 4

8.0 PARTY LINE, TECHNICAL CONCEPT ............. 5

9.0 GUARANTEE ................................. 5

10.0 TECHNICAL SPECIFICATIONS .................. 5

User Manual PS 280 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

1.0 GENERAL DESCRIPTION

The PS 280 is designed to be a dual channel power For each channel separately, the intercom line impedance
supply in an ASL intercom system and can be used in circuitry is installed.
portable as well as fixed applications. It incorporates an
adjustable auxiliary program signal input and uses only 1U Fully electronic switching increases reliability and allows
of 19" rack space. for remote Mic Mute facility.

All microphones of the stations connected to the PS 280
The unit is very versatile and ideal for use in applications can be muted by pushing a single front panel button.
where standard microphone cable is available and ease of
setup is of paramount importance. An Aux input at the rear panel, allows injecting external

audio signals of line or mic level into the intercom audio
The intercom line power supply is fully protected and can line. When 'mic level' is selected, +30V phantom power is
drive at least 20 beltpacks or 10 speaker stations, or a available at the Aux input connector.
combination, operating at full power.

2.0 UNPACKING

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

* The PS 280 reaches you in flawless condition.
* Mains 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

returning.
If any are missing contact your dealer.

If any damage has occured, please notify your dealer
With the PS 280 will be a small packet of spare fuses. immediately so that a written claim can be initiated. Please
Please keep them in a safe place. also refer to the guarantee section of this manual.
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 power supply regulator is mounted on the rear of the
the PS 280. It is not necessary to provide rear support by unit, and after a period of time it will feel hot to the touch.
extra bracing or shelving. This is quite normal, and should be no cause for alarm.

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.

4.0 MAINS POWER

The PS 280 may be connected to the mains power outlet If a change is necessary, the internal mains transformer
to which other audio equipment is connected. The outlet wiring will need to be reconnected as shown in the figure.
should have a clean earth. Avoid using mains power Remember that the AC mains fuse will need to be
outlets which also power dimmer controlled lighting changed for one of the correct rating as indicated in
equipment. section 5.9

Before connecting the unit to its AC power source, check The power cord supplied with this unit carries the following
that the mains voltage setting is set in accordance with information label:
your local mains voltage. The voltage setting is indicated
by a label on the rear panel.

This appliance must be earthed

WARNING

User Manual PS 280 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

1

4.0 MAINS POWER continued

IMPORTANT

The wires in this mains lead are colour coded in
accordance with the following code: Setting for 115 V AC

green and yellow 2. Empty

Earth / safety ground 3. White + Yellow

blue
Neutral Setting for 230 V AC
brown 1. Red

Live 2. White + Green

As the colours of the wires in the mains lead may not
correspond with the coloured markings identifying the
terminals in your plug, proceed as follows:

- The wire which is coloured green-and-yellow must be
connected to the terminal in the plug which is marked
with the letter "E", or by the earth symbol which is or
coloured green.

- The wire which is coloured blue must be connected to
the terminal which is marked with the letter "N" or
coloured black.

- The wire which is coloured brown must be connected
to the terminal which is marked with the letter "L" or
coloured red.

Transformer Voltage settings (Internal)

1. Red + Green

3. Yellow

Voltage:

Voltage:

Those units that are supplied to the North American
market will have an integral moulded 3 pin connector
which is provided to satisfy required local standards.

4.1 SAFETY EARTHING

The green-and-yellow wire of the mains cord must always The PS 280 employs professionally designed audio input
be connected to the electrical installation safety earth or and output circuits which do not require the disconnection
ground. It is essential for personal safety as well for proper of any safety earth for the avoidance of hum loops.
operation of the PS 280 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 PROPERLY GROUNDED outlet.

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

2

User Manual PS 280 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.