PS 285 DUAL CHANNEL BOOSTER POWER SUPPLY USER MANUAL October 2013 This product is 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 SAFETY INSTRUCTIONS ................................................................. 3 GENERAL DESCRIPTION PS 285 ................................................... 4 MAINS POWER ................................................................................. 4 MECHANICAL INSTALLATION ......................................................... 5 FRONT PANEL CONTROLS .............................................................
1.0 SAFETY INSTRUCTIONS Please always follow these instructions to help ensure against injury to yourself or damage to the system 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.
2.0 GENERAL DESCRIPTION PS 285 The PS 285 is a dual channel booster power supply which functions as an auxiliary power supply should the main power supply (a PS 279 master station or a PS 289 separate power supply) be insufficient to drive the required number of user stations. The unit is placed in the network to feed a dedicated group of user stations See section 12 “System Configuration”).
4.0 MECHANICAL INSTALLATION For this unit a vertical rack space of 1RU (44,5 mm) is required. 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. 5.0 The power supply regulator is mounted on the bottom of the PS 285. After a period of time it will feel hot to the touch on top and bottom. This is normal and should be no cause for alarm.
7.0 TECHNICAL SPECIFICATIONS Switch Mode Power Supply Mains voltage: 100 - 240V AC, 50/60Hz Output voltage: +30V DC (+/- 5%) Max. output power: 75 Watts Circuit breaker delay time: 0.2 sec. Automatic reset time: 3.0 sec. PS 285 Dimensions & Weight Width: 19" (483 mm) / Height: 1U (44,5 mm) Depth: 150 mm / Weight: 1.63 kg 0 dBu defined as 775 mV into open circuit ASL reserves the right to alter specifications without prior notice 8.
9.0 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.
11.0 EARTHING CONCEPT 12.