1.PRO SERIESUSER MANUALFOR THEPS 289DUAL CHANNEL POWER SUPPLY CONTENTS 1.0SAFETY INSTRUCTIONS.3 2.0GENERAL DESCRIPTION ......................................... 4 3.0UNPACKING .............................................................. 4 4.0MECHANICAL INSTALLATION .................................. 4 5.0MAINS POWER .......................................................... 5 6.0FRONT PANEL CONTROLS ...................................... 6 7.0REAR PANEL CONTROLS ........................................ 7 8.0CABLING .................................................................... 8 9.0PARTY LINE, TECHNICAL CONCEPT ...................... 910.0WARRANTY ............................................................... 911.0DESIGN CRITERIA .................................................... 912.0TECHNICAL SPECIFICATIONS ............................... 10User Manual PS 289 / Issue 1 2007 ASL Intercom, Utrecht, The Netherlands.

2. 2 User manual PS 289 / Issue 1 2007 ASL Intercom, Utrecht, The Netherlands 3. 1.0 IMPORTANT SAFETY INSTRUCTIONS ! Please always follow these instructions to help ensureagainst injury to yourself and damage to the system.1) Read all safety and operating instructions 11)Insert the plug properly. Do not defeat the before you operate the apparatus. safety purpose of the polarized or grounding- type plug.2) Retain all safety and operating instructions forA polarized AC line plug has two blades with future reference. one wider than the other. This plug will fit into the power outlet only one way. This is a safety3) Heed all warnings on the apparatus and in the feature. If you are unable to insert the plug fully safety and operating instructions.into the outlet, try reversing the plug. If the plug still fails to fit, contact an electrician to replace4) Follow all installation, operating and usethe obsolete outlet. instructions. A grounding type plug has two blades and a third grounding prong. The wide blade or the5) Unplug the apparatus from the AC powerthird prong are provided for your safety. If the outlet before cleaning. Use only a damp cloth provided plug does not fit into your outlet, for cleaning the exterior of the apparatus. consult an electrician to replace the obsolete outlet.6) Do not use accessories or attachments not recommended by the manufacturer, as they 12)Route power supply cords so that they are not may cause hazards and void the warranty.likely to be walked on or pinched by items placed upon or against them. Pay particular attention to cords at plugs, convenience7) Do not operate this apparatus in high receptacles, and the point where they exit from humidity areas or expose it to water or the apparatus. moisture.13)Do not overload wall outlets or extension8) Do not place the apparatus on an unstable cords, as this can result in a risk of fire or cart, stand, tripod, bracket or table. The electrical shock. apparatus may fall, causing serious personal injury and damage to the apparatus.14)Unplug this apparatus during lightning storms or when unused for long periods of time.9) Do not block or cover any openings in the apparatus. These are provided for ventilation and protection from overheating. 15)Never insert objects of any kind into the Never place the apparatus near any heat apparatus through openings, as the objects sources such as radiators, heat registers,may touch dangerous voltage points or short stoves, or other apparatus (including out parts. This could cause fire or electrical amplifiers) that produce heat. Do not place the shock. apparatus in an enclosure such as a cabinet without proper ventilation.16)Refer all servicing to qualified service personnel. Servicing is required when the 10) Operate the apparatus using only the type ofapparatus has been damaged in any way, such power source indicated on the marking label.as when the power-supply cord or plug is Unplug the apparatus power cord by grippingdamaged, liquid has been spilled or objects the power plug, not the cord. have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 4. 2.0 GENERAL DESCRIPTIONThe PS 288 is designed to be a dual channel power For each channel separately, the intercom line impedancesupply in an ASL intercom system and can be used in circuitry is installed.portable as well as fixed applications. It incorporates anadjustable auxiliary program signal input and uses only 1UFully electronic switching increases reliability and allowsof 19 rack space.for remote Mic Mute facility.All microphones of the stations connected to the PS 280The unit is very versatile and ideal for use in applicationscan be muted by pushing a single front panel button.where standard microphone cable is available and ease ofsetup is of paramount importance. An Aux input at the rear panel, allows injecting externalaudio signals of line level into the intercom audio line.The intercom line power supply is fully protected and candrive at least 20 beltpacks or 10 speaker stations, or acombination, operating at full power..3.0 UNPACKINGThe shipping carton contains the parts listed below ASL has taken great care to ensure that this product* The PS 289reaches 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 needreturning.If any are missing, contact your dealer.If any damage has occurred, please notify your dealerWith the PS 289 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.4.0 MECHANICAL INSTALLATIONA vertical rack space of 1U (1.75, 44mm) is required for The power unit is mounted on the bottom of the unit, andthe PS 289. It is not necessary to provide rear support byafter a period of time it will feel hot to the touch on topextra bracing or shelving.and bottom. This is normal, and should be no cause foralarmAdequate ventilation must be provided by allowingsufficient space around the sides and rear of the unit toensure free circulation of air. Forced cooling is notrequired.4User manual PS 289 / Issue 1 2007 ASL Intercom, Utrecht, The Netherlands 5. 5.0MAINS POWERThe PS 289 may be connected to the mains power outlet As the colours of the wires in the mains lead may notto which other audio equipment is connected. The outlet correspond with the coloured markings identifying theshould have a clean earth. Avoid using mains powerterminals in your plug, proceed as follows:outlets, which also power dimmer controlled lightingequipment. -The wire that is coloured green-and-yellow mustbe connected to the terminal in the plug, which isBefore connecting the unit to its AC power source, checkmarked with the letter E, or by the groundif the mains voltage of the unit (100 V 240 V) is insymbol, or is coloured green.accordance with your local mains voltage.-The wire that is coloured blue must be connectedto the terminal that is marked with the letter Nor coloured black. WARNING -The wire that is coloured brown must be This appliance must be earthed connected to the terminal that is marked with theletter L or coloured red.Those units that are supplied to the North Americanmarket will have an integral moulded 3-pin connector,which is provided to satisfy required local standards.IMPORTANTThe wires in this mains lead are colour coded inaccordance with the following code:green and yellow / safety groundblue / neutralbrown/ live5.1 SAFETY EARTHINGThe green-and-yellow wire of the mains cord must always might be mounted shall be connected to the samebe connected to the electrical installation safety earth or grounding circuit.ground. It is essential for personal safety as well as forproper operation of the PS 289 and the other connectedThe PS 289 employs professionally designed audio inputstations. This wire is internally connected to all exposedand output circuits which do not require the disconnectionmetal surfaces. Any rack framework into which this unit of any safety earth for the avoidance of hum loops.5.2 POWERING UPPowering up procedure:- Make sure that the red power switch on the left side of -Turn on the power with the red button. The redthe front panel is OFF.overload LED will light up for about 3 seconds, then- Connect the power cord to the rear of the station. extinguishes and the green power LED will switch on,- Plug the other end of the power cord into aindicating the station is active.PROPERLY GROUNDED outlet.See for further installation and operation the concerningsections.5.3MAINS POWER SETTINGThe unit has a switch mode power supply and acceptsmains voltages from 100 240 VAC (50 / 60 Hz).Mains FuseFor all voltages : T 1250.User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 6. 6.0 FRONT PANEL CONTROLS AND CONNECTOR2 34 567 8911 POWER ON/OFF switchMains power push button for switching the internal6 ALL MICS ON/OFF buttonpower supply ON and OFF.With this pushbutton all microphones of the connectedstations can be switched off. Each user station can2 OVERLOAD LEDactivate its microphone again by pushing its TALKThis LED illuminates, when the internal circuit-breaker button.shuts off line power due to overload. A cause foroverload can be a connection of too many user 7 ALL BUZZERS ON/OFF buttonstations, a short-circuit in the interconnecting cables,With this button all buzzers of the connected stationsor a thermal overload. The circuit-breaker resets can be muted. The buzzers stay muted until the Muteautomatically 3 seconds after the cause of thebutton is switched off again.overload has been removed, and restores line powerautomatically.8 AUX VOLUME control channel ADuring short-circuit, the LED will flash every 3This knob adjusts the level of the Aux input signal toseconds. During thermal overload it will be lit intercom line A.continuously.The LED will also come on for a few seconds every 9 AUX VOLUME control channel Btime you switch on mains power. This knob adjusts the level of the Aux input signal tointercom line B.3 POWER LEDThis LED illuminates if line power is supplied by theinternal power supply.4 SYSTEM LINK IN AThis LED illuminates if another ASL Intercom Systemhas been connected to the PS 289 through theSystem Link connector of Channel A. The LineImpedance is now provided by the other Intercomsystem and the internal line impedance for Channel Ais switched off. The Buzzer mute function on ChannelA can now only be controlled by the connectedsystem, while the Buzzer Mute on Channel B will stillbe controlled by the PS 289. The Mic Mute signalsgiven by the other Intercom system are also sent tothe user stations connected to Channel A of the PS289. If a Mic Mute is given by the PS 289, it is onlysend to its own channels and does not mute themicrophones of the other Intercom System.5 SYSTEM LINK IN BThis LED illuminates if another ASL Intercom Systemhas been connected to the PS 289 through theSystem Link connector of Channel B. The LineImpedance is now provided by the other Intercomsystem and the internal line impedance for Channel Bis switched off. The Buzzer mute function on ChannelB can now only be controlled by the connectedsystem, while the Buzzer Mute on Channel A will stillbe controlled by the PS 289. The Mic Mute signalsgiven by the other Intercom system are also sent tothe user stations connected to Channel B of the PS289. If a Mic Mute is given by the PS 289, it is onlysend to its own channels and does not mute themicrophones of the other Intercom System.6 User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 7. 7.0 REAR PANEL CONTROLS AND CONNECTOR17 A & B LINE connectors 21 MAINS INLET / DISCONNECT DEVICE These XLR-3 type connectors are for connecting the IEC Mains connector. For correct wiring and operation remote-stations, via standard microphone cable. Thererefer to section 4.0. are two connectors for channel A and two connectors for channel B.WARNING Pin assignments: Before you plug in the mains voltage, check if:1. 0V / ground shield * The fuse is correct2. +30V power wire* The voltage is correct3. audio wire18 SYSTEM LINK IN connector Input for the cable of an external party-line Intercom22 FUSE system. If one or both channels of the PS 289 are to This fuse protects the PS 289 against severe internal be connected to another intercom system then these damage, in case of malfunction in the power section. connectors will accept the communication signals fromTo remove the fuse the mains cord must be removed. the other system. It is most important to place the correct fuse in the19 AUX INPUT connector holder: This XLR-3 type aux input connector is electronically balanced and accepts audio levels between 20dBu to Mains voltage fuse +21dBu on line level. 100 240 VAC T 1250 mA Pin assignments:Spare fuses are supplied with the unit.1. 0V / ground2. signal +23 DC INPUT connectors3. signal - These connectors can be used as a backup powersupply or when no 100/240 VAC voltage supply is20 GROUND LIFT switch available. They accept 12 28 VDC. With this switch the pin 1 of the AUX input XLR is lifted from ground when in Lift position.User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 7 8. 8.0 CABLINGFor the PRO Series Intercom system the interconnectingcables are of the shielded two-conductor microphonecable type and the intercom line connectors are of theXLR-3 type. Audio and Call signals are on XLR pin 3, DCpower is on XLR pin 2. XLR pin 1 is connected to theshield of the cable, which functions as the common returnfor audio and power.Since the audio signal is transferred in an unbalancedway, certain rules have to be obeyed when installing thecables of an intercom network. This is to avoid earth loopsand to minimize power loss and the possible effect ofelectromagnetic fields.These rules are:Use high quality (multipair) cable. Keep cables parallel as much as possible For interconnecting user stations, power suppliesWhen two (multi channel) units in a network are and accessories in an ASL Intercom network, useconnected by more than one cable, make sure that high quality shielded two-conductor (minimum these cables are parallel to each other over the size 2 x 0.226 mm (#24AWG)). microphone whole distance between those units. When usingmulti pair cable, parallelism is ensured in the best cable only.possible way. In case of a multi channel intercom network, use high quality microphone multipair cable only, Avoid closed loops. each pair consisting of two conductors (minimumAlways avoid that cables are making a loop. So- 2x 0.15 mm2) with separate shield. Multipaircalled ring intercom should not physically be cabled cable should also have an overall shield.as a ring. All cable routes should have a starconfiguration, with the central earthing point (usually Use flexible cables.close to the power supply position) as the centre ofUse flexible single and multipair microphonethe star.cable instead of cable with solid cores, especiallywhen the cable is subjected to bending during Keep cables away from electromagnetic sources.operation or installation.Keep intercom cables away from high-energy cables,e.g. 110/220/380V mains power or dimmer controlled Separate cable screen to XLR pin 1.feeds for spotlights.The screen of each separate microphone cableIntercom cables should cross high-energy cables atand/or the screen of each single pair in aan angle of 90 only.multipair cable should be connected to pin 1 ofIntercom cables should never be in the sameeach XLR-3 connector. Do not connect this cabletrunking as energy cables.screen to the metal housing of the connector or tometal wall boxes (outlets). Place power supplies in a central position.See page 12 for Earthing Concept.In order to avoid unacceptable power losses, placeCable trunks, connection boxes and overall the power supplies as close as possible to where multipair cable screen to clean earth. most power consumption occurs or, in other words,most user stations are placed. Metal cable trunks, metal connection boxes and overall multipair cable screen should be inter- Connect ASL power supply to a clean mains connected and, at one point (the central earthingoutlet. point) in the intercom network only, be connectedThe ASL power supply may be connected to the to a clean safety earth.mains power outlet to which other audio equipment is See page 12 for Earthing Concept.connected. Avoid using mains outlets which also Keep metal connection boxes and cable trunkspower dimmer controlled lighting systems.isolated from other metal parts.In case of more complex installations, dont hesitate toMetal housings for intercom cables and connectorscontact us. Please send us a block diagram of theshould be mounted in such a way that they areplanned network with a list of all user stations and theirisolated from other metal cable and connectorpositions, and we are happy to advise you on cablinghousings and from any other metal constructionlayout.parts.See Party Line, Technical Concept8 User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 9. 9.0 PARTY LINE, TECHNICAL CONCEPT11.0 DESIGN CRITERIAASLs PRO Series offers a complete, two way (fullApplications / Environment of useduplex) communication system.ASL Pro Series equipment is designed for use as aUsers of the system are connected via a party line. wired communications system in theatres, in Radio/TVMaster stations (with built-in power supply), beltpacks,production facilities, in factories, and in utilitiesspeaker stations and power supplies are interconnectedcomplexes such as airports, railway stations and coachvia standard microphone cable (minimum cable size of 2terminals.x 0.226 mm (#24AWG)). One wire is used as an audioASL equipment can be used outdoors in normalline, one as a power line and the screen of the cableweather conditions. In conditions with excessive coldfunctions as earth/return.(50 C) or humidity (>85%), ASLequipment might not perform properly.Current drive is used for signal transfer. Each stationutilises a current amplifier to amplify the microphoneASL equipment is not designed to be used undersignal and place it on the common audio line where, duewater, or in situations where explosion safe equipmentto the constant line impedance (situated in the poweris specified by authorities.supply between XLR pin 3 and 1), a signal voltage isdeveloped which can be further amplified and sent toEmissionheadphones or loudspeakers.ASL Pro Series equipment does not generate highfrequency (HF) signals. An ASL power supply canThis principle has three advantages:generate a weak magnetic field caused by the powertransformer. To avoid possible negative affects, keep- the use of a single audio line allows several stationsASL power supplies at a safe distance from equipmentto talk and listen simultaneously.which is very sensitive to magnetic fields.- due to the high bridging impedance offered by eachstation, the number of stations on line has noImmunityinfluence on the level of the communications signal.ASL Pro Series is designed on the base of low- power and audio to the intercom stations use theimpedance signal transport. User stations and powersame cable.supplies are to be connected via low capacity cablingwith an overall screen (also see Cabling section).The Call signal is also sent as a current on the audioTherefore, HF signals are adequately rejected toline. It develops a DC potential over the line impedancemaintain an intelligible communication, unless strongthat will be sensed by each station and interpreted as aelectro-magnetic fields (exceeding 3 V/m) are in theCall signal.direct vicinity of the interconnecting cables.ASL 19 rack mount units are housed in a 1 mm steel10.0GUARANTEE enclosure (closed construction), which offers, bynature, the highest possible rejection of electro-magnetic fieldsASL Intercom warrants this unit to the original end-userpurchaser against defects in workmanship and materialsASL speaker stations (PS 130/230/430) are housed inin its manufacture for a period of one year from the date an enclosure made of 1 mm steel with ABS sideof shipment to the end-user.panels, which offers adequate rejection of electro-magnetic fields.Faults arising from misuse, unauthorised modificationsor accidents are not covered by this warranty. If the unitASL beltpacks are housed in an ABS enclosure andis faulty, it should be sent in its original packing to the are slightly more sensitive to electro-magnetic fields.supplier or your local ASL dealer, with shipping prepaid. Negative effects in the performance of beltpacks canA note must be included stating the faults found and abe avoided when keeping them at a safe distance fromcopy of the original suppliers invoice. equipment which might radiate strong electro-magneticfields, such as transmitters antennas and dimmers.THIS PRODUCT WAS DESIGNED, DEVELOPED ANDMANUFACTURED BY:ASL INTERCOM BVUTRECHT, THE NETHERLANDSWebsite: www.asl-inter.comEmail: info@asl-inter.comUser manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 9 10. 12.0TECHNICAL SPECIFICATIONS PS 289POWER SUPPLYmains voltage range All units : 100 240 V 50/60Hz ACDC ouput voltage +30 V +/- 5% DCripple and noise < 11 mV rmsmax. output current 2.5 A continous, 3.5 A peakcircuit breaker delay time0.2 sec.automatic reset time3.0 sec.DC Input12 28 VAUX INPUTinput impedance11 KohmsNominal input level -20 dBu to +10 dBuMax. input level +21 dBuDIMENSIONS AND WEIGHTwidth 19" (483 mm)height1U (44.5 mm)depth 150 mmweight1.85 KgGENERAL SYSTEM SPECIFICATIONSintercom line impedance350 ohms (1kHz)2.2 Kohms (DC)intercom line audio level nom. 18 dBu Max. +4 dBudynamic range 80 dBcall send signal +2.8 mAcall receive signal threshold+2.4 V DCsupply voltage +30 V DC (12 V to 32 V)mic mute power interrupt time 0.1 sec.Note: 0 dBu = 775 mV into open circuit.ASL reserve the right to alter specifications without further notice. 10User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 11. User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 11 12. 12 User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 13. User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 13 14. 14 User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 15. User manual PS 289 / Issue 1 2006 ASL Intercom, Utrecht, The Netherlands 15