ASL INTERCOM PS 280 User Manual - Page 5

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5.0

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-circuit in the

interconnecting cables or thermal overload), it activates

a circuit-breaker which immediately shuts off line

power. This circuit breaker resets automatically 3

seconds after the overload situation is terminated,

restoring line power automatically.

During short-circuit, the overload LED extinguishes

very shortly every 3 seconds. During thermal overload

the LED burns continuously.

This overload LED also comes on every time you

switch on the main power.

6.0

REAR PANEL CONTROLS & CONNECTORS

7 A & B LINE connectors

These XLR-3 type connectors are for connecting user

stations, via standard microphone cable.

There are two connectors for channel A and two

connectors for channel B.

Pin assignments :

1. 0 V / ground shield

2. +30 V power wire

3. audio wire

8 AUX INPUT connector

This XLR-3 type aux input is electronically balanced

and accepts audio levels between -18dBu to +22dBu

on line level, and -38dBu to +2dBu on mic level.

Pin assignments :

1. 0V / ground

2. Signal +

3. Signal -

When mic level is selected, a +30V DC phantom power

is supplied to pins 2 and 3.

3 POWER LED

This LED illuminates if line power is supplied by the

internal power supply.

4 ALL MIC'S ON/OFF button

With this pushbutton all microphones of the connected

stations can be muted.

5 ALL BUZZERS ON/OFF button

With this button all buzzers of the connected stations

can be muted.

6 AUX VOLUME control knobs

These knobs adjusts the level of the aux input signal to

each of the two intercom lines.

9 FUSE

This fuse protects the PS 280 against severe internal

damage, in case of malfunction in the power section.

To remove the fuse the mains cord must be removed.

It is most important to place the correct fuse in the

holder :

mains voltage

fuse

220 - 240 VAC T 315 mA

100 - 120 VAC T 630 mA

Spare fuses will be found in the small packet supplied

with the unit.

10 MAINS INLET

IEC Mains connector. For correct wiring and operation

refer to section 4.0.

Before you plug in the mains voltage, check if:

The fuse is correct

The voltage is correct

WARNING