User manual ASL INTERCOM PS 285

[. . . ] This is quite normal, and should be no cause for alarm. A vertical rack space of 1U (1. 75", 44mm) 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. Forced cooling is not required. User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands. 3 4. 0 MAINS POWER The PS 285 may be connected to the mains power outlet to which other audio equipment is connected. [. . . ] This circuitbreaker resets automatically 3 seconds after the overload situition is terminated, restoring line power automatically. During short-circuit, the overload LED extinguishes very shortly every 3 seconds. This overload LED also comes on every time you switch on the main power. 3 ON LED This LED illuminates if a partyline is connected to the intercom input and the unit supplies power to the output. STANDBY LED This LED illuminates when no line power is detected at the input connector and no power is supplied to the output connector. 2 4 User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands. 5 7. 0 Type REAR PANEL CONTROLS & CONNECTORS Serial Number B PUSH B A PUSH A WARNING : THIS UNIT MUST BE EARTHED. HIGH VOLTAGE INSIDE DISCONNECT MAINS INPUT BEFORE REMOVING COVER. AC Input voltage : ! 90 - 240 V 50 - 60 Hz USE 250V FUSES ONLY Fuse : Intercom HOLLAND Intercom Line Intercom Line T 1250 mA 5 6 7 8 5 OUTPUT connector This XLR-3 supplies power to the user stations connected to the PS 285 when line power is supplied to the input connector. There is one connector for channel A and one connector for channel B. audio wire 7 FUSE This fuse protects the PS 285 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 INPUT connector This XLR-3 is the sense input and should be connected to the intercom line from the main power supply. There is one connector for channel A and one connector for channel B. Pin assignments are like the output connector. 8 MAINS inlet IEC Mains connector. For correct wiring and operation refer to section 4. 0. WARNING Before you plug in the mains voltage, check if: * The fuse is correct 6 User Manual PS 285 / Issue 1 © 2004 ASL Intercom, Utrecht, The Netherlands. 8. 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 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. For interconnecting user stations, power supplies and accessories in an ASL Intercom network, use high quality shielded two-conductor (minimum 2x 0. 30 mm2) microphone cable only. In case of a multi channel intercom network, use high quality microphone 'multipair' cable only, each pair consisting of two conductors (minimum 2x 0. 15 mm2) with separate shield. Multipair cable should also have an overall shield. Use flexible single and multipair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. The screen of each separate microphone cable and/or the screen of each single pair in a multipair cable, should be connected to pin 1 of each XLR-3 connector. [. . . ] 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. [. . . ]