ASL INTERCOM PS 285 Gebruikershandleiding - Pagina 5

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4.0

MECHANICAL INSTALLATION

For this unit a vertical rack space of 1RU (44,5

mm) is required. It is not necessary to provide rear

support by extra bracing or shelving.

Adequate ventilation must be provided by allowing

sufficient space around the sides and rear of the

unit to ensure free circulation of air.

5.0

FRONT PANEL CONTROLS

POWER ON/OFF push button

To switch mains power on or off

OVERLOAD LED

This red LED illuminates if 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.

6.0

REAR PANEL CONNECTORS

DC INPUT connectors

These connectors accept 24 – 30 V DC as a

back-up power source should mains fail or not be

available

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 (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

PAGE 5

User Manual PS 285 / October 2013 © ASL Intercom BV

Forced cooling is not required.

The power supply regulator is mounted on the

bottom of the PS 285. After a period of time it will

feel hot to the touch on top and bottom.

This is normal and should be no cause for alarm.

"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 30V

DC line power to its connected user stations.

STANDBY LED (one for each channel)

This green LED is lit if no line power is detected

at the intercom line input connectors.

The referring channel of the PS 285 is now in

standby mode

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 2 connectors for

channel A and 2 connectors for channel B.

Pin assignment: same as the input connectors

FUSE holder

A fuse protects the PS 285 against severe

internal damage in case of malfunction of the

power section. Before replacing the fuse the

mains cord must be removed.

MAINS INLET

IEC Mains connector.