User manual

PAGE 4
User Manual PS 285 / October 2013 © ASL Intercom BV
WARNING
This appliance must be earthed
2.0 GENERAL DESCRIPTION PS 285
The PS 285 is a dual channel booster power
supply which functions as an auxiliary power
supply should the main power supply (a PS 279
master station or a PS 289 separate power
supply) be insufficient to drive the required
number of user stations.
The unit is placed in the network to feed a
dedicated group of user stations
See section 12 “System Configuration”).
The PS 285 is also used in case the intercom
party lines are very long as a result of which - at a
certain distance from the main power supply - the
available line power voltage is in danger to drop
below the required minimum level.
The PS 285 is fully protected and can safely drive
up to 20 Pro Series beltpacks or 10 remote 2-ch
speaker stations operating at full power.
Remotely activating the PSU of the PS 285:
As soon as line power, provided by the main
power supply in an intercom system, is sensed at
an input connector of the PS 285, its power supply
module is activated for the referring channel.
The yellow “On” LED of that channel lights up.
If no line power is sensed, the referring channel of
the PS 285 is in “Standby Mode” and its green
“Standby” LED is illuminated (see also “Powering
up” in section 3).
3.0 MAINS POWER
The PS 285 may be connected to a mains power
outlet of 100 - 240 V AC (50 - 60 Hz), 100 watts.
The outlet should have a clean earth. Avoid using
mains power outlets which also power dimmer
controlled lighting equipment.
Fuse type all voltages: T 1250
The wires in the mains lead are color coded:
Green/yellow: safety ground
Blue: neutral
Brown: live
In case the colors of the wires in the mains lead
do not correspond with the colored markings of
the terminals in your plug, proceed as follows:
o The wire that is colored green-and-yellow
must be connected to the terminal in the
plug, which is marked with the letter “E”, or
by the ground symbol, or is colored green.
o The wire that is colored blue must be
connected to the terminal that is marked
with the letter “N” or colored black.
o The wire that is colored brown must be
connected to the terminal marked with the
letter “L” or colored red.
The green-and-yellow wire of the mains cord must
always be connected to the electrical installation
safety earth or ground. This is essential for
personal safety as well as for proper operation of
the PS 285 and connected user stations.
This wire is internally connected to all exposed
metal surfaces. Any rack framework into which
this unit might be mounted shall be connected to
the same grounding circuit.
The PS 285 employs professionally designed
audio input and output circuits which do not
require the disconnection of any safety earth to
avoid hum loops.
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 mains outlet.
• Turn on the power with the red button. The
red overload LED will light up for about 3
seconds and then extinguishes. The green
LEDs of channel A and B are now lit,
indicating that the PS 285 is in standby
mode.
• As soon as a powered party line (coming
from the master power supply in an ASL
intercom system) is connected to an
intercom line input of the PS 285, the
yellow ‘On’ LED of the referring channel
lights up, indicating that line power is
supplied to the intercom line output
connector of that channel.