User manual

PAGE 5
User Manual PS 285 / Issue 2011 © ASL Intercom BV
7.0 FRONT PANEL CONTROLS
1 POWER ON/OFF push button
If this button is pushed the internal power supply is
connected to mains power.
2 OVERLOAD LED
This red LED illuminates when the circuit breaker
shuts off line power due to overload. A cause for
overload can be too many user stations connected
or a short circuit in the interconnecting cables.
The circuit breaker resets automatically 3 seconds
after the cause of the overload has been removed
and restores the line power, provided the PS 285 is
not in standby mode. During short circuit, the LED
flashes every 3 seconds. Every time mains power is
switched on, the LED is lit for a few seconds
.
3 “ON” LED (one for each channel)
This yellow LED illuminates if line power is detected
at the intercom line input connector. The standby
mode (see #4) is abolished and the referring
channel of PS 285 is now supplying 30 V DC line
power to its connected user stations.
4 STANDBY LED (one for each channel)
This green LED is lit when no line power is detected
at the intercom line input connectors. The referring
channel of the PS 285 is now in standby mode
8.0 REAR PANEL CONNECTORS
5 DC INPUT connectors
In case 100/240 V AC power is not available, the
PS 285 can be powered by a DC supply (12 – 28 V),
to be connected to the unit via these connectors
6 INTERCOM LINE INPUT connectors
These XLR-3 connectors are the sense inputs and
should be connected to the intercom lines coming
from a PS 289 separate power supply or from a PS
279 master station. There is a connector for channel
A and a connector for channel B.
Pin assignments:
pin 1: 0V / ground shield
pin 2: +30V power wire
pin 3: audio wire
7 INTERCOM LINE OUTPUT connectors
Provided line power is detected at the XLR-3 input
connectors (#6), 30V DC line power is supplied to
the user stations which are connected to these XLR-
3 output connectors via standard microphone cable.
There are two output connectors for channel A and
two output connectors for channel B. .
Pin assignment: same as the input connectors
8 FUSE holder
A fuse protects the PS 285 against severe
internal damage in case of malfunction in the
power section. .
Before replacing the fuse the mains cord
must be removed. Make sure that the correct
fuse (T 1250) is placed in the holder.
9 MAINS INLET
IEC Mains connector.
9.0 TECHNICAL SPECIFICATIONS
Switch Mode Power Supply
Mains voltage: 100 - 240V AC, 50/60Hz
Output voltage: +30V DC (+/- 5%)
Max. output power: 75 Watts
Circuit breaker delay time: 0.2 sec.
Automatic reset time: 3.0 sec.
PS 285 Dimensions & Weight
Width: 19" (483 mm) Height: 1U (44,5 mm)
Depth: 150 mm Weight: 1.63 kg
0 dBu defined as 775 mV into open circuit
ASL reserves the right to alter specifications without prior notice