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BS 181 Single Channel Power Supply User Manual
1.
BASIC SERIES
USER MANUAL FOR THE BS 181 SINGLE CHANNEL POWER SUPPLY CONTENTS 1.0 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . 3 2.0 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.0 MECHANICAL INSTALLATION . . . . . . . . . . . . . . . . . . . 3 4.0 MAINS POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5.0 FRONT PANEL CONTROLS . . . . . . . . . . . . . . . . . . . . . 5 6.0 REAR PANEL CONNECTORS . . . . . . . . . . . . . . . . . . . 5 7.0 CABLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.0 PARTY LINE, TECHNICAL CONCEPT . . . . . . . . . . . . . 7 9.0 GUARANTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 10.0 TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 7 User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland.
2.
2
User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland.
3.
1.0
GENERAL DESCRIPTION The BS 181 is designed to be a power supply in an ASL intercom system and can be used in portable as well as fixed applications. This makes the BS 181 very versatile and ideal for use in applications where standard microphone cable is available and ease of setup is of paramount importance. The intercom line power supply is fully protected and can drive at least 20 beltpacks operating at full power. 2.0 UNPACKING The shipping carton contains the parts listed below. * The BS 181 * Power cable * Spare fuses * User manual If any are missing contact your dealer. With the BS 181 will be a small packet of spare fuses. Please keep them in a safe place. ASL has taken great care to ensure that this product reaches you in flawless condition. After unpacking the unit please inspect for any physical damage to the unit, and retain the shipping carton and relevant packing materials for use should the unit need returning. If any damage has occured, please notify your dealer immediately so that a written claim can be initiated. Please also refer to the guarantee section of this manual. 3.0 MECHANICAL INSTALLATION 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. After a period of timethe unit will feel warm to the touch. This is quite normal, and should be no cause for alarm. User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland. 3
4.
4.0
MAINS POWER IMPORTANT The BS 181 may be connected to the mains power outlet The wires in this mains lead are colour coded in to which other audio equipment is connected. The outlet accordance with the following code: should have a clean earth. Avoid using mains power outlets which also power dimmer controlled lighting green and yellow Earth / safety ground equipment. blue Neutral brown Live The unit needs no voltage setting and accepts mains voltages from 90 - 240 V ac, 50/60 Hz. 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 power cord supplied with this unit carries the following - The wire which is coloured green-and-yellow must be information label: connected to the terminal in the plug which is marked with the letter "E", or by the earth symbol which is or coloured green. WARNING - The wire which is coloured blue must be connected to This appliance must be earthed 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. 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 be connected to the electrical installation safety earth or ground. It is essential for personal safety as well for proper operation of the BS 181 and the other connected stations. This wire is internally connected to all exposed metal surfaces. 4.2 POWERING UP Powering up procedure: - Make sure that the power switch on the left side 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 PROPERLY GROUNDED outlet. - Turn on the power with the red button, the green power LED will go on, indicating the station is active. See for further installation and operation the concerning sections. 4 User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland.
5.
5.0
FRONT PANEL CONTROLS & CONNECTOR 1 POWER ON/OFF switch Mains power push button for switching ON and OFF the power supply. 2 POWER LED This LED illuminates if line power is supplied by the internal power supply. 6.0 REAR PANEL CONTROLS & CONNECTORS 3 Line connectors These XLR-3 type connectors are for connecting the user-stations, via standard microphone cable. Pin assignments: 1. 0 V / ground shield 2. +30 V power wire 3. audio wire 4 FUSE This fuse protects the BS 181 against severe internal damage, in case of malfunction in the power section. Disconnected the power cord before replacing the fuse. It is most important to place the correct fuse in the holder : 90 - 240 VAC T 1250 mA Spare fuses will be found in the small packet supplied with the unit. An extra internal fuse is located on the printed circuit board, if neccesary replace this fuse ONLY with a 4A. 5 MAINS INLET IEC Mains connector. For correct wiring and operation refer to section 4.0. User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland. 5
6.
7.0
CABLING For the BASIC 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 ¼ way, certain rules have to be obeyed when installing the cables of an intercom network. This is to avoid earth loops and to minimize power loss and the possible effect of electromagnetic 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 (two 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 two 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) Avoid closed loops. with separate shield. Multipair cable should also have Always avoid that cables are making a loop. So-called an overall shield. 'ring intercom' should not physically be cabled as a ring. All cable routes should have a 'star' configuration, Use flexible cables. with the central earthing point (usually close to the Use flexible single and multipair microphone cable power supply position) as the centre of the star. instead of cable with solid cores, especially when the cable is subjected to bending during operation or Keep cables away from electromagnetic sources. 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 cable and/or Intercom cables should cross high energy cables in at 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 trunking Do not connect this cable screen to the metal housing as energy cables. of the connector or to metal wall boxes (outlets). See page 10 for Earthing Concept. Place power supply in a central position. In order to avoid unacceptable power losses, place the Cable trunks, connection boxes and overall power supply as close as possible to where most multipair cable screen to clean earth. power consumption occurs or, in other words, most 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 Connect ASL power supply to a 'clean' mains network only, be connected to a clean earth or a safety outlet. earth. The ASL power supply may be connected to the mains See page 10 for Earthing Concept. power outlet to which other audio equipment is connected. Avoid using mains outlets which also power Keep metal connection boxes and cable housings dimmer controlled lighting systems. 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. ¼ See Party Line, Technical Concept 6 User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland.
7.
8.0
PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS BS 181 ASL's BASIC Series offers a complete two way ('full POWER SUPPLY duplex') communications system. mains voltage range all units: 90 -240 V 50/60Hz AC Users of the system are connected via a 'party line'. DC output voltage +30 V +/-5% DC Master stations (with built-in power supply), beltpacks ripple and noise 11 mV rms and power supplies are interconnected via standard max. output current 1,8 A continuous / 2,3 A peak microphone cable. One wire is used as an audio line, one as a power line and the screen of the cable functions DIMENSIONS AND WEIGHT as earth/return. width 176 mm height 42 mm Current drive is used for signal transfer. Each station depth 139 mm utilises a current amplifier to amplify the microphone signal weight 0.9 Kg and place it on the common audio line where, due to the constant line impedance (situated in the power supply GENERAL SYSTEM SPECIFICATIONS between XLR pin 3 and 1), a signal voltage is developed intercom line impedance 350 ohms (1kHz) which can be further amplified and sent to the 2.2 Kohms (DC) headphones. intercom line audio level nom. -18 dBu max. +4 dBu This principle has three advantages: dynamic range 80 dB - the use of a single audio line allows several stations to call send signal 2.8 mA talk and listen simultaneously. call receive signal threshold +2.4 V DC - due to the high bridging impedance offered by each supply voltage +30 V DC (12 V to 32 V) station, the number of stations 'on line' has no influence on the level of the communications signal. Note: 0 dBu = 775 mV into open circuit. - power and audio to the intercom stations use the same cable. ASL reserves the right to alter specifications without further notice. 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 This unit is warranted by ASL Intercom to the original end- user purchaser against defects in workmanship and materials in it's manufacture for a period of one year from 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: ASL-intercom BV MAARSSEN (UTRECHT) HOLLAND. Tel. +31 30 241 1901, Fax +31 30 241 0638 User Manual BS 181 / Issue 1 © 1998 ASL Intercom, Utrecht, Holland. 7
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