PAGE 7
User Manual PS 279 / August 2016 © ASL Intercom BV
20
A & B LINE connectors (XLR-3)
To connect the PS 279 to remote stations via the
intercom party lines. There are 2 connectors for
each channel. Pin assignment: Pin 1: 0V / ground
shield Pin 2: +30V power. Pin 3: audio wire
21
GROUND LIFT switch
If in “lift” position pin 1 of the AUX input
XLR is lifted from ground.
22
AUX INPUT connector (XLR-3)
Electronically balanced input for line level audio
signals. Pin assignment: Pin1: 0 V / ground
Pin 2: signal (+), Pin 3: signal ( -)
23
MAINS INLET
IEC Mains connector
24
FUSE
This fuse protects the PS 279 against severe
internal damage in case of malfunction in the
power section. Spare fuses are supplied with
the unit.
Before replacing the fuse the mains cord
must be removed. Make sure that the correct
fuse (T 1250) is placed in the holder
.
7.0
INTERNAL CONTROLS
P 17
Setting A: Monaural (PCB with XLR-4 =
factory setting)
Setting B: Binaural (PCB with XLR-5)
P 13
(in case of binaural setting only, see P 17)
Setting A: left headset can: Ch A + AUX
right headset can: Ch B + AUX
Setting B: left headset can: Ch A + Ch B
right headset can: AUX
P 33
Jumper placed: Signal ground connected
to Protective Earth (factory setting)
Jumper removed: Signal ground
disconnected from Protective Earth.
This to avoid earth loop (causing hum) in
case the PS 279 is connected to another
party line intercom system via a System
Link connector
8.0
TECHNICAL SPECIFICATIONS
System
Dynamic range: 80 dB
Frequency response: 200 Hz
– 15 kHz (-3 dB)
Call send signal: +2.8 mA
Call receive signal threshold: +2.4V DC
Operation voltage: 24 - 32 V DC
Power interrupt time (mic mute): 0.1 sec.
Line
Impedance: 350 Ω (1 kHz) / 2.2 kΩ (DC)
Audio level: nom.-18 dBu, max. 0 dBu
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.
DC Input
Supply voltage: 24
– 30 V DC
Mic. Pre-amp
Gain: max. 40 dB
Presence filter: +6 dB at 5 kHz
Power to electret mic.: +9 V DC
Headphone Driver Amps
Max. output level:
monaural: 16
Vrms (@ 200 Ω
binaural: 2 x 10.3 Vrms (@ 40
0 Ω
Max. output power:
monaural: 1.3
Wrms (@ 200 Ω
binaural: 2 x 0.27
Wrms (@ 400 Ω
Side Tone
Rejection: 0 - 30 dB adjustable
Buzzer:
Max. SPL: 85 dBA
Aux input (Line level)
Input impedance: 33
kΩ
Nominal input level: 0 dBu
Max. input level: +22 dBu
Dimensions & Weight
Width: 19" (483 mm) / Height: 1RU (44,5 mm)
Depth: 150 mm / Weight: 1.85 kg
0 dBu defined as 775 mV into open circuit
ASL reserves the right to alter specifications
without prior notice
