User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands.
5
6.0 FRONT PANEL CONTROLS
1 POWER ON/OFF switch
Mains power push button for switching ON and OFF
the internal power supply.
2 OVERLOAD LED
This LED illuminates if the internal power supply has
shut off line power due to overload.
If the internal power supply is overloaded (too many
user stations are connected or short-cicuit in the
interconnecting cables), it activates a circuit-breaker
which immediately shuts off line power. This circuit-
breaker resets automatically 3 seconds after the
overload situition is terminated, restoring line power
automatically.
During short-circuit, the overload LED extinguishes
very shortly every 3 seconds.
This overload LED also comes on every time you
switch on the main power.
3 ON LED
This LED illuminates if a partyline is connected to the
intercom input and the unit supplies power to the
output.
4 STANDBY LED
This LED illuminates when no line power is detected at
the input connector and no power is supplied to the
output connector.
Pro series
Intercom
PS 285
Power
Supply
Booster
over
load
Power
CHANNEL A
CHANNEL B
On
Standby
On
Standby
1
2
3
4