PS 285 DUAL CHANNEL BOOSTER POWER SUPPLY USER MANUAL ISSUE 2011 © ASL Intercom BV DESIGNED AND MANUFACTURED BY: ASL INTERCOM B.V. ZONNEBAAN 42 3542 EG UTRECHT THE NETHERLANDS PHONE: +31 (0)30 2411901 FAX: + 31 (0)30 2667373 E-MAIL: info@asl-inter.com WEB: www.asl-inter.
CONTENT OF THIS USER MANUAL 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 SAFETY INSTRUCTIONS ........................................................................................ 3 UNPACKING ............................................................................................................. 3 WARRANTY.............................................................................................................. 3 MECHANICAL INSTALLATION ............................................
1.0 SAFETY INSTRUCTIONS 1) Read all safety and operating instructions before you operate the apparatus. 2) Retain all safety and operating instructions for future reference. 3) Read all warnings on the apparatus and in the safety and operating instructions. 4) Follow all instructions for installation, operating and use. 5) Unplug the apparatus from the AC power outlet before cleaning. Use only a damp cloth for cleaning the exterior of the apparatus.
.0 MECHANICAL INSTALLATION A vertical rack space of 1U (1.75” / 44,5 mm) is required for the PS 285. It is not necessary to provide rear support by extra bracing or shelving. Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the unit to ensure free circulation of air. 5.
7.0 FRONT PANEL CONTROLS 1 POWER ON/OFF push button If this button is pushed the internal power supply is connected to mains power. 2 OVERLOAD LED This red LED illuminates when the circuit breaker shuts off line power due to overload. A cause for overload can be too many user stations connected or a short circuit in the interconnecting cables.
10.0 PARTY LINE, TECHNICAL CONCEPT User stations in an ASL intercom system are connected via one or several 'party lines'. A party line offers two way („full duplex‟) communication and consists of standard microphone (multi-pair) 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.
12.0 EARTHING CONCEPT 13.
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