Asl intercom PS 280 User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 280

DUAL CHANNEL POWER SUPPLY

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 1

2.0 UNPACKING ................................. 1

3.0 MECHANICAL INSTALLATION ................... 1

4.0 MAINS POWER ............................... 1

5.0 FRONT PANEL CONTROLS ..................... 3

6.0 REAR PANEL CONTROLS AND CONNECTORS .... 3

7.0 CABLING .................................... 4

8.0 PARTY LINE, TECHNICAL CONCEPT ............. 5

9.0 GUARANTEE ................................. 5

10.0 TECHNICAL SPECIFICATIONS .................. 5

1.0 GENERAL DESCRIPTION

The PS 280 is designed to be a dual channel power For each channel separately, the intercom line impedance supply in an ASL intercom system and can be used in circuitry is installed. portable as well as fixed applications. It incorporates an adjustable auxiliary program signal input and uses only 1U Fully electronic switching increases reliability and allows of 19" rack space. for remote Mic Mute facility.

All microphones of the stations connected to the PS 280 The unit is very versatile and ideal for use in applications can be muted by pushing a single front panel button. where standard microphone cable is available and ease of setup is of paramount importance. An Aux input at the rear panel, allows injecting external

audio signals of line or mic level into the intercom audio The intercom line power supply is fully protected and can line. When 'mic level' is selected, +30V phantom power is drive at least 20 beltpacks or 10 speaker stations, or a available at the Aux input connector. combination, operating at full power.

2.0 UNPACKING

The shipping carton contains the parts listed below. ASL has taken great care to ensure that this product

* The PS 280 reaches you in flawless condition. * Mains power cable After unpacking the unit please inspect for any physical * Spare fuses damage to the unit, and retain the shipping carton and * User manual relevant packing materials for use should the unit need

returning. If any are missing contact your dealer.

If any damage has occured, please notify your dealer With the PS 280 will be a small packet of spare fuses. immediately so that a written claim can be initiated. Please Please keep them in a safe place. also refer to the guarantee section of this manual. There is also one spare fuse included in the mains inlet.

3.0 MECHANICAL INSTALLATION

A vertical rack space of 1U (1.75", 44mm) is required for The power supply regulator is mounted on the rear of the the PS 280. It is not necessary to provide rear support by unit, and after a period of time it will feel hot to the touch. extra bracing or shelving. This is quite normal, and should be no cause for alarm.

Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the unit to ensure free circulation of air. Forced cooling is not required.

4.0 MAINS POWER

The PS 280 may be connected to the mains power outlet If a change is necessary, the internal mains transformer to which other audio equipment is connected. The outlet wiring will need to be reconnected as shown in the figure. should have a clean earth. Avoid using mains power Remember that the AC mains fuse will need to be outlets which also power dimmer controlled lighting changed for one of the correct rating as indicated in equipment. section 5.9

Before connecting the unit to its AC power source, check The power cord supplied with this unit carries the following that the mains voltage setting is set in accordance with information label: your local mains voltage. The voltage setting is indicated by a label on the rear panel.

This appliance must be earthed

WARNING

4.0 MAINS POWER continued

IMPORTANT

The wires in this mains lead are colour coded in accordance with the following code: Setting for 115 V AC

green and yellow 2. Empty

Earth / safety ground 3. White + Yellow

blue Neutral Setting for 230 V AC brown 1. Red

Live 2. White + Green

As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows:

- The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter "E", or by the earth symbol which is or coloured green.

- The wire which is coloured blue must be connected to the terminal which is marked with the letter "N" or coloured black.

- The wire which is coloured brown must be connected to the terminal which is marked with the letter "L" or coloured red.

Transformer Voltage settings (Internal)

1. Red + Green

3. Yellow

Voltage:

Those units that are supplied to the North American market will have an integral moulded 3 pin connector which is provided to satisfy required local standards.

4.1 SAFETY EARTHING

The green-and-yellow wire of the mains cord must always The PS 280 employs professionally designed audio input be connected to the electrical installation safety earth or and output circuits which do not require the disconnection ground. It is essential for personal safety as well for proper of any safety earth for the avoidance of hum loops. operation of the PS 280 and the other connected stations. This wire is internally connected to all exposed metal surfaces and any rack framework into which this unit might be mounted is assumed to be connected to the same grounding circuit.

4.2 POWERING UP

Powering up procedure:

- Make sure that the red power switch on the left side PROPERLY GROUNDED outlet.

of the front panel is OFF.

- Connect the power cord to the rear of the station.

- Plug the other end of the power cord into a

- Turn on the power with the red button. The red overload LED will light up for about 3 seconds, then extinguishes and then the green power LED will go on, indicating the station is active.

See for further installation and operation the concerning sections.

5.0 FRONT PANEL CONTROLS

1 POWER ON/OFF switch 3 POWER LED

Mains power push button for switching ON and OFF This LED illuminates if line power is supplied by the the internal power supply. internal power supply.

2 OVERLOAD LED 4 ALL MIC'S ON/OFF button

This LED illuminates if the internal power supply has With this pushbutton all microphones of the connected shut off line power due to overload. stations can be muted. 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 With this button all buzzers of the connected stations a circuit-breaker which immediately shuts off line can be muted. power. This circuit breaker resets automatically 3 seconds after the overload situation is terminated, restoring line power automatically. These knobs adjusts the level of the aux input signal to During short-circuit, the overload LED extinguishes each of the two intercom lines. 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.

5 ALL BUZZERS ON/OFF button

6 AUX VOLUME control knobs

6.0 REAR PANEL CONTROLS & CONNECTORS

7 A & B LINE connectors 9 FUSE

These XLR-3 type connectors are for connecting user This fuse protects the PS 280 against severe internal stations, via standard microphone cable. damage, in case of malfunction in the power section. There are two connectors for channel A and two To remove the fuse the mains cord must be removed. connectors for channel B.

It is most important to place the correct fuse in the

Pin assignments : holder :

1. 0 V / ground shield mains voltage

2. +30 V power wire fuse

3. audio wire 220 - 240 VAC T 315 mA 100 - 120 VAC T 630 mA

8 AUX INPUT connector

This XLR-3 type aux input is electronically balanced Spare fuses will be found in the small packet supplied and accepts audio levels between -18dBu to +22dBu with the unit. on line level, and -38dBu to +2dBu on mic level.

10 MAINS INLET

Pin assignments : IEC Mains connector. For correct wiring and operation

1. 0V / ground refer to section 4.0.

2. Signal +

3. Signal -

When mic level is selected, a +30V DC phantom power is supplied to pins 2 and 3.

Before you plug in the mains voltage, check if:

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The fuse is correct

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The voltage is correct

WARNING

7.0 CABLING

For the PRO Series Intercom system the interconnecting cables are of the shielded two-conductor microphone cable type and the intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power.

Since the audio signal is transferred in an way, certain rules have to be obeyed when installing the cables of an intercom network. This in order to avoid earth loops and to minimize power loss and the possible effect of electromagnetical fields.

These rules are:

Use high quality (multipair) cable.

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For interconnecting user stations, power supplies and When two (multi channel) units in a network are accessories in an ASL Intercom network, use high connected by more than one cable, make sure that quality shielded two-conductor (minimum 2x 0.30 mm2) these cables are parallel to each other over the whole microphone cable only. distance between those units. When using multipair In case of a multi channel intercom network, use high cable, parallelism is ensured in the best possible way. quality microphone 'multipair' cable only, each pair consisting of two conductors (minimum 2x 0.15 mm2) with separate shield. Multipair cable should have an Always avoid that cables are making a loop. So-called overall shield as well. 'ring intercom' should not physically be cabled as a

Use flexible cables.

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Use flexible single and multipair microphone cable power supply position) as the center of the star. instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. Keep intercom cables away from high energy cables,

Separate cable screen to XLR pin 1.

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The screen of each separate microphone cable and/or Intercom cables should cross with energy cables in an the screen of each single pair in a multipair cable, angle of 90( only. should be connected to pin 1 of each XLR-3 connector. Intercom cables should never be in the same (metal) Do not connect this cable screen to the metal housing trunks with energy cables. of the connector or to metal wall boxes (outlets). See last page for Earthing Concept.

Cable trunks, connection boxes and overall

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multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall user stations are placed. multipair cable screen should be interconnected and, at one point (the 'central earthing point') in the intercom network only, be connected to a clean earth or a safety earth. The ASL power supply may be connected to the mains See last page for Earthing Concept. power outlet to which other audio equipment is

Keep metal connection boxes and cable trunks

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isolated from other metal parts.

Metal housings for intercom cables and connectors In case of more complex installations, don't hesitate to should be mounted in such a way that they are isolated contact us. Please send us a block diagram of the planned from other metal cable and connector housings and network with a list of all user stations and their positions, from any other metal construction parts. and we are happy to advise you on cabling lay out.

unbalanced *

Keep cables parallel as much as possible.

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Avoid closed loops.

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ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the

Keep cables away from electromagnetical sources.

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e.g. 110/220/380V mains power or dimmer controlled feeds for spotlights.

Place power supplies in a central position.

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In order to avoid unacceptable power losses, place the power supplies as close as possible to where most power consumption occurs or, in other words, most

Connect ASL power supply to a 'clean' mains

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outlet.

connected. Avoid using mains outlets which also power dimmer controlled lighting systems.

* See Party Line, Technical Concept

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 280

ASL's PRO Series offers a complete two way ('full duplex') communications system. mains voltage range 115 V units: 100 - 125 V 60Hz AC Users of the system are connected via a 'party line'. 230 V units: 210 - 250 V 50Hz AC Master stations (with built-in power supply), beltpacks, DC output voltage +30 V +/-5% DC speaker stations and power supplies are interconnected riple and noise < 11 mV rms via standard microphone cable. One wire is used as an max. output current 1.7 A continuous, 3 A peak audio line, one as a power line and the screen of the cable circuit-breaker delay time 0.2 sec. functions as earth/return. automatic reset time 3.0 sec.

Current drive is used for signal transfer. Each station utilises a current amplifier to amplify the microphone signal input impedance 30 Kohms (balanced line level) and place it on the common audio line where, due to the 4.6 Kohms (balanced mic level) constant line impedance (situated in the power supply nominal input level -18 dBu to +6 dBu (line level) between XLR pin 3 and 1), a signal voltage is developed -38 dBu to -14 dBu (mic level) which can be further amplified and sent to headphones or max. input level +22 dBu (line level) loudspeakers. +2 dBu (mic level)

This principle has three advantages:

- the use of a single audio line allows several stations to width 19" (483 mm) talk and listen simultaneously. height 1U (44.5 mm)

- due to the high bridging impedance offered by each depth 150 mm station, the number of stations 'on line' has no weight 2.55 Kg influence on the level of the communications signal.

- power and audio to the intercom stations use the same cable. intercom line impedance 350 ohms (1kHz)

The Call signal is also sent as a current on the audio line. intercom line audio level nom. -18 dBu It develops a DC potential over the line impedance which max. +4 dBu will be sensed by each station and interpreted as a Call dynamic range 80 dB signal. call send signal +2.8 mA

POWER SUPPLY

AUX INPUT

phantom power +30 V DC (mic level selected)

DIMENSIONS AND WEIGHT

GENERAL SYSTEM SPECIFICATIONS

2.2 Kohms (DC)

call receive signal threshold +2.4 V DC supply voltage +30 V DC (12 V to 32 V) mic mute power interrupt time 0.1 sec

9.0 GUARANTEE

This unit is warranted by ASL Intercom to the original enduser purchaser against defects in workmanship and materials in it's manufacture for a period of one year from the date of shipment to the end-user.

Faults arising from misuse, unauthorised modifications or accidents are not covered by this warranty. If the unit is faulty, it should be sent in it's original packing to the supplier or your local ASL dealer, with shipping prepaid. A note must be included stating the faults found and a copy of the original suppliers invoice.

THIS PRODUCT WAS DESIGNED, DEVELOPED AND MANUFACTURED BY:

AMPCO SOUND LAB BV, MAARSSEN (UTRECHT), HOLLAND

Note: 0 dBu = 775 mV into open circuit. ASL reserve the right to alter specifications without further notice.

Asl intercom PS 280 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual