User manual ASL INTERCOM PS 280

[. . . ] 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. The shipping carton contains the parts listed below. * The PS 280 * Mains power cable * Spare fuses * User manual If any are missing contact your dealer. With the PS 280 will be a small packet of spare fuses. [. . . ] If the internal power supply is overloaded (too many user stations are connected or short-circuit in the interconnecting cables or thermal overload), it activates a circuit-breaker which immediately shuts off line power. This circuit breaker resets automatically 3 seconds after the overload situation is terminated, restoring line power automatically. During short-circuit, the overload LED extinguishes very shortly every 3 seconds. During thermal overload the LED burns continuously. This overload LED also comes on every time you switch on the main power. 3 POWER LED This LED illuminates if line power is supplied by the internal power supply. ALL MIC'S ON/OFF button With this pushbutton all microphones of the connected stations can be muted. ALL BUZZERS ON/OFF button With this button all buzzers of the connected stations can be muted. AUX VOLUME control knobs These knobs adjusts the level of the aux input signal to each of the two intercom lines. 2 4 5 6 6. 0 REAR PANEL CONTROLS & CONNECTORS 7 A & B LINE connectors These XLR-3 type connectors are for connecting user stations, via standard microphone cable. There are two connectors for channel A and two connectors for channel B. audio wire 9 FUSE This fuse protects the PS 280 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 220 - 240 VAC T 315 mA 100 - 120 VAC T 630 mA Spare fuses will be found in the small packet supplied with the unit. 8 AUX INPUT connector This XLR-3 type aux input is electronically balanced and accepts audio levels between -18dBu to +22dBu on line level, and -38dBu to +2dBu on mic level. Signal When mic level is selected, a +30V DC phantom power is supplied to pins 2 and 3. 10 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 The voltage is correct 4 User Manual PS 280 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 7. 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 in order to avoid earth loops and to minimize power loss and the possible effect of electromagnetical 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 have an overall shield as well. [. . . ] 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. Avoid using mains outlets which also power dimmer controlled lighting systems. In case of more complex installations, don't hesitate to contact us. [. . . ]