User manual FURMAN AR1215

[. . . ] To prevent risk of fire or injury, damaged cords and cables should be replaced immediately. When left unused for a long period of time, the power cord of the AR-1215 or AR-2306 should be unplugged from the outlet. The AR-1215 or AR-2306 should be serviced by qualified service personnel when: ±5V ±5V ±4V ±10V ±10V ±10V AR-1215 AR-1215J AR-1215J AR-2306 AR-2306 AR-2306 120 120 100 220 230 240 97 to 141 97 to 141 80 to 122 174 to 264 181 to 276 190 to 288 NOTE: The three models in the AR-Series differ in their nominal AC output voltages. Model AR-2306 produces either 220, 230, or 240 VAC. Where differences exist between models, information applicable to the AR-2306 is shown in the text of this manual in brackets [ ]. a. [. . . ] A regulator is a device which, through use of a transformer, corrects the voltage deviation by stepping it up or down so that it is as close as possible to the nominal level. Though they are usually of very short duration, the energy they contain can be considerable, enough to damage sensitive solid-state components in audio and computer equipment. They are caused unpredictably by electric motors switching on or off (on the premises or outside), utility company maintenance operations, nearby lightning strikes, and other factors. Spikes (also called surges or transients) are absorbed by special components called MOV's in the AR-series to provide safe voltage levels to protect your equipment. RFI/EMI INTERFERENCE: Noise from RFI (Radio Frequency Interference) or EMI (Electro Magnetic Interference) involves lower voltages and less energy than is found in spikes, but it is continuous rather than transient in nature. It is not likely to cause physical damage, but it can certainly be annoying, producing static in audio circuits, "snow" on video screens, or garbled data in computers. Noise can be introduced into AC lines by nearby radio transmitters, certain kinds of lighting, electric motors, and others. EXTREME VOLTAGE PROTECTION The AR-Series includes special circuitry to sense over- and under-voltages and positively shut down the output before possible damage is done. See the Specifications on the back page for the exact voltages at which shutdown occurs. It will come back on automatically when the overvoltage is removed as long as the voltage has not exceeded 300V [all models]. The red LED labelled EXTREME VOLTAGE SHUTDOWN indicates the shutdown condition. To provide protection against a catastrophic error in AC mains wiring, dangerously high voltages (those over approximately 300V) will cause an internal fuse to blow, but equipment plugged into the Voltage Regulator will not be damaged. FUSES AND CIRCUIT BREAKERS There is one fuse and one circuit breaker in the AR-Series. In the event that the unit appears to be completely dead (neither the Power switch nor any LED's light up), unplug the power cord and the load and check the breaker. A fast-blow 15 amp [6 amp] circuit breaker is accessible at the rear panel without removing the unit from the rack. This breaker will trip if the unit's 15 amp [6 amp] capacity is exceeded at any time. Your equipment will always work normally when this light is on, and often will work satisfactorily even when it is off. If you wish to monitor your AR-1215's output voltage more precisely, you may want to use a Furman PL-PLUS Power Conditioner and Light Module in conjunction with it [use model PL-PLUS-E with model AR-2306]. The PL-PLUS is the perfect complement to a Furman Voltage Regulator to assist in rack power distribution. 5 The AR-Series uses a design based on an eight-tap toroidal autoformer. The toroidal design assures minimal leakage of stray magnetic fields, and, because of its high efficiency, a very compact size for its rating. The Voltage Regulator's circuitry monitors the incoming line voltage with each cycle, comparing it to an extremely precise voltage reference, accurate to ±0. 15%. If a voltage fluctuation requires that a different tap be selected, the new tap is electronically switched exactly at the zero-crossing, to avoid distorting the AC waveform. Most commercial voltage regulators using multiple-tapped transformers switch taps at uncontrolled times, thereby creating voltage spikes and clicks that can leak into the audio!Hysteresis in the switching circuits avoids "chatter" or unnecessary switching back and forth between adjacent taps. [. . . ] AR-2306: provides regulation ±10V in the following ranges: 174-264V (220 mode), 181-276V (230 mode), 190-288V (240 mode). Shutdown Range: AR-1215 (and AR-1215J set to 120V): Below 75V or above 150V. AR-2306: Below 146V or above 279V (220 mode); Below 152V or above 287V (230 mode), Below 158V or above 300V (240 mode). AR-2306: ±10V. Spike Protection Modes: Line to neutral, neutral to ground, line to ground. [. . . ]