Asl intercom PS 680 User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 680

SIX CHANNEL POWER SUPPLY

WITH AUX MATRIX

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

All microphones of the stations connected to the PS 680 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. The 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 40 beltpacks or 20 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 680 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 680 will be a small packet of spare fuses. immediately so that a written claim can be initiated. Please keep them in a safe place. Please 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 regulators are mounted inside the unit, the PS 680. It is not necessary to provide rear support by and after a period of time it will feel warm 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 680 may be connected to the mains power outlet to which other audio equipment is connected. The outlet should have a clean earth. Avoid using mains power outlets which also power dimmer controlled lighting equipment.

Before connecting the unit to its AC power source, check that the mains voltage, the unit accepts any AC voltage from 90 - 240 Volts, 50 - 60 Hz.

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:

- The wire which is coloured brown must be connected

green and yellow to the terminal which is marked with the letter "L" or

Earth / safety ground coloured red.

blue Neutral Those units that are supplied to the North American brown market will have an integral moulded 3 pin connector

Live which is provided to satisfy required local standards.

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.

4.1 SAFETY EARTHING

The green-and-yellow wire of the mains cord must always The PS 680 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 of any safety earth for the avoidance of hum loops. proper operation of the PS 680 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 - Turn on the power with the red button. The red

side of the front panel is OFF. overload LEDs will light up for about 3 seconds,

then extinguishes and then the green power LED

- Connect the power cord to the rear of the station. will go on, indicating the station is active.

- Plug the other end of the power cord into a See for further installation and operation the concerning

PROPERLY GROUNDED outlet. sections.

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 LEDS

These LED’s illuminate 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

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 master level of the aux (I & II) input signals before these are routed to the matrix.

7 AUX MATRIX trimmers

These trimmers control the volume of each AUX input as send to that specific channel.

8 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

9 AUX INPUT connectors

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.

10 MIC / LINE

SWITCHES

With these switches the sensitivity of each AUX input can be chosen, Mic level or Line level. When mic level is selected, a +30V DC phantom power is supplied to pins 2 and 3.

11 MIC GAIN

When Mic level is selected this trimmer adjusts the sensitivity of the AUX input.

10 FUSE

This fuse protects the PS 680 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

90 - 240 VAC T 1250 mA

Spare fuses will be found in the small packet supplied with the unit.

6.0 REAR PANEL CONTROLS & CONNECTORS continued

11 MAINS INLET

IEC Mains connector. For correct wiring and operation refer to section 4.0.

12 REMOTE MUTE CONTROL AND AUX OUTPUTS

On this connector are available :

Mic mute controls for each channel seperately Buzzer mute controls for each channel seperately Mic mute control for all channels Buzzer mute control for all channels The unbalanced AUX signals Ground (0Volts, pin 1 of each XLR) +30 Volts power (each channel summed)

To activate a mute, connect the desired pin(s) of the D-25 connector (7-13) to ground (1, 14, 15 or 16). The unbalanced AUX are available on pins 2 and 3, the signal is the preamplified AUX input signal taken after the master volume controls (6), before it is send to the matrix. Use high impedance loads only ! Minimum of 20 K ohms. Lower loads may disrubt the AUX signals to the intercom lines.

Pin layout of the D-25 : 1 Ground (0V)

2 Unbalanced AUX signal AUX 2 3 Unbalanced AUX signal AUX 1 4 +30 Volts (maximum load of 1A !) 5 +30 Volts 6 + 9 Volts (maximum load of 50 mA !) 7 Mic mute all channels (connect to ground momentary to activate) 8 Mic mute channel F (connect to ground momentary to activate) 9 Mic mute channel E (connect to ground momentary to activate) 10 Mic mute channel D (connect to ground momentary to activate) 11 Mic mute channel C (connect to ground momentary to activate) 12 Mic mute channel B (connect to ground momentary to activate) 13 Mic mute channel A (connect to ground momentary to activate) 14 Ground (0V) 15 Ground (0V) 16 Ground (0V) 17 not used 18 not used 19 Buzer mute all channels (connect to ground as long as needed to activate) 20 Buzzer mute channel A (connect to ground as long as needed to activate) 21 Buzzer mute channel B (connect to ground as long as needed to activate) 22 Buzzer mute channel C (connect to ground as long as needed to activate) 23 Buzzer mute channel D (connect to ground as long as needed to activate) 24 Buzzer mute channel E (connect to ground as long as needed to activate) 26 Buzzer mute channel F (connect to ground as long as needed to activate)

! Please note that the +9 Volt supply is NOT shortcircuit protected !

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 unbalanced * 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. !! Keep cables parallel as much as possible.

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 these cables are parallel to each other over the whole mm2) 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 overall shield as well.

!! Use flexible cables.

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.

!! Separate cable screen to XLR pin 1.

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 90E only. should be connected to pin 1 of each XLR-3 Intercom cables should never be in the same (metal) connector. Do not connect this cable screen to the trunks with energy cables. metal housing of the connector or to metal wall boxes (outlets). See last page for Earthing Concept.

!! Cable trunks, connection boxes and overall

multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall 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. See last page for Earthing Concept.

!! Keep metal connection boxes and cable trunks

isolated from other metal parts.

Metal housings for intercom cables and connectors should be mounted in such a way that they are isolated from other metal cable and connector housings and from any other metal construction parts.

!! Avoid closed loops.

Always avoid that cables are making a loop. So-called 'ring intercom' should not physically be cabled as a ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the

!! Keep cables away from electromagnetical sources.

Keep intercom cables away from high energy cables, e.g. 110/220/380V mains power or dimmer controlled feeds for spotlights.

!! Place power supplies in a central position.

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 user stations are placed.

!! Connect ASL power supply to a 'clean' mains

outlet.

The ASL power supply may be connected to the mains power outlet to which other audio equipment is connected. Avoid using mains outlets which also power dimmer controlled lighting systems.

In case of more complex installations, don't hesitate to contact us. Please send us a block diagram of the planned network with a list of all user stations and their positions, and we are happy to advise you on cabling lay out.

* See Party Line, Technical Concept

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 680

ASL's PRO Series offers a complete two way ('full duplex') communications system. Users of the system are connected via a 'party line'. Master stations (with built-in power supply), beltpacks, speaker stations and power supplies are interconnected via standard microphone cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return.

Current drive is used for signal transfer. Each station utilises a current amplifier to amplify the microphone signal and place it on the common audio line where, due to the constant line impedance (situated in the power supply between XLR pin 3 and 1), a signal voltage is developed which can be further amplified and sent to headphones or loudspeakers.

This principle has three advantages:

- the use of a single audio line allows several stations to talk and listen simultaneously.

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

- power and audio to the intercom stations use the same cable.

The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which will be sensed by each station and interpreted as a Call signal.

9.0 GUARANTEE

POWER SUPPLY

mains voltage range 90 - 240 V AC, 50 - 60 Hz DC output voltage +30 V +/-5% DC riple and noise < 11 mV rms max. output current 2 A continuous, 3 A peak

(each channel) 4 A continues, 6 A peak

(total) circuit-breaker delay time 0.2 sec. automatic reset time 3.0 sec.

AUX INPUT

input impedance 30 Kohms (balanced line level)

4.6 Kohms (balanced mic level)

nominal input level -18 dBu to +6 dBu (line level)

-38 dBu to -14 dBu (mic level)

max. input level +22 dBu (line level)

+2 dBu (mic level)

phantom power +30 V DC (mic level selected)

DIMENSIONS AND WEIGHT

width 19" (483 mm) height 1U (44.5 mm) depth 250 mm weight 2 Kg

GENERAL SYSTEM SPECIFICATIONS

intercom line impedance 350 ohms (1kHz)

2.2 Kohms (DC)

intercom line audio level nom. -18 dBu

max. +4 dBu dynamic range 80 dB call send signal +2.8 mA 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

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

Zonnebaan 42, 3606 CC Maarssenbroek Tel. +31 30 2411901 Fax +31 30 2410638 Email : info@asl-inter.com

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

Asl intercom PS 680 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual