4
User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
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.
WARNING
This appliance must be earthed
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.
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.
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.
-
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.
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.