Furman Sound, Inc 1997 South McDowell Blvd.
Petaluma, California 94954-6919 USA Phone: 707-763-1010 Fax: 707-763-1310 www.furmansound.com
E-mail: info@furmansound.com
AC Line Voltage Regulator
MODEL AR-2330D
Owner’s Manual
AR-2330D front view |
AR-2330D rear view, shown with optional RRM-2 rear rack ears |
AR-Series Features
●Output capacity 30 amps
●Output voltage can be changed to 220V or 240V with internal jumper
●Usable range for most equipment is an additional 10% above and below the capture ranges shown in Specifi cations (pg. 4)
●One twist lock inlet and one regulated, conditioned twistlock outlet on rear pane
●Eight-tap toroidal autoformer
●10-LED bargraph Input Voltage meter
●10-LED bargraph true RMS reading Output Current meter
●Extreme overvoltage/undervoltage causes instant shutdown, protecting equipment
●Extreme Voltage Shutdown indicator LED
●Output In Regulation indicator
●Fast-acting user-accessible circuit breaker protects against overload or shorts. Also acts as ON/OFF switch
●Low stray magnetic fi eld
●Low noise, variable speed fan provides cooling for heavyduty, continuous operation
●Rugged, two-space rack unit weighs only 49 lbs. (22 kg.)
Determine the Correct Voltage
s 240V the correct voltage for your application?
The AR-2330D is factory set for 240V output. All equipment should be checked fi rst, to be sure that 240V is a suitable voltage (normally listed near the power cord). If a lower voltage is desired, the AR-2330D should have its internal jumper changed to 220 or 230 volts. If in doubt, consult your dealer
General Information
Thank you for choosing a FurmanAR-2330DAC Line Voltage Regulator.AnAR-Series regulator is the perfect accessory to any audio, video, or computer rackmount system requiring clean
fi ltered, and regulated AC power for optimum operation
Furman Voltage Regulators are intended to protect sensitive electronic equipment from problems caused by AC line voltage irregularities—brownouts or overvoltages that can cause audio tonal changes, digital equipment malfunction (such as loss of MIDI programs or other data), or, in extreme cases, permanent damage. The AR-2330D accepts input voltages over a wide AC voltage range (see table above) converts them to, and stabilizes themat±10Vfor240Voutput.(Theoutputvoltagecanbechanged to 220V or 230V with an internal jumper.) Voltages approximately ±10% beyond theAR-2330D’s range may be converted to usable levels, depending on the requirements of the equipment. See Figure 1
TheAR-2330D has one twistlock inlet and one twistlock outlet on the rear panel. The outlet is regulated, spike-suppressed, and
EMI/RFI fi ltered. There are no controls except an on-off breaker switch
Limitations The AR-2330D is for use with AC voltage only. DCvoltagesshouldneverbeappliedtoit.Also,itdoesnotchange or regulate line frequency. The output frequency will always be the same as the incoming line frequency
Maximum Load
The AR-2330D can handle loads totalling up to 30 amperes as long as the input voltage is equal to or above the selected output voltage (240V). For voltages below that level, its capacity must be derated at approximately .15 amperes per volt. See Figure 2. To cope successfully with worst-case brownout conditions, you should take this into account. An easy way to calculate this yourself is to multiply input voltage by maximum input current (ex. 200V x 30A = 6000 watts) to get the maximum power the unit can handle at this input voltage. Then divide this number by the output voltage (6000/240 = 25 amps). If your load draws any more than 25 amps, it will cause the input current to rise above 30 amps and will then trip the breaker
Extreme Voltage Protection
The AR-Series includes special circuitry to sense overand under-voltages and positively shut down the output before possible damage is done. For the AR-2330D, overvoltages are those over 300V. When the input voltage exceeds that limit, the power will cut off. It will come back on automatically when the overvoltage is reduced to 285V or lower. The red LED labelled EXTREME VOLTAGE SHUTDOWN indicates the shutdown condition. The output is also shut down for extremely low input voltages, less than 158V
To provide additional protection against a catastrophic high voltage condition, voltages over approximately 300V may cause an internal fuse to blow. This is a 250 mA/250V fuse and requires removal of the top cover. If this unlikely condition occurs, please remove power from the unit fi rst
Fuses and Circuit Breakers
There are three fuses and one fast-acting magnetic circuit breaker in the AR-2330D.
1.Aprecision 30 amp magnetic circuit breaker is used as the on/off switch. If the input to the unit exceeds 30 amps, the breaker will trip. Be sure to reduce your load before re-powering the unit, or it will likely trip again. Refer to the previous section “Maximum Load” if you are uncertain why the breaker is tripping, or want to understand the relationship between input voltage and current vs. output voltage and current
2.A fast-blow 250 mA amp fuse is located inside the unit, as previously mentioned. To replace it, the unit must be completely disconnected from all power and removed from its rack. The six hex head screws and oneAllen head screw holding the top cover must be removed.
3.A Fast Blow 1 amp fuse protects a low current auxiliary winding on the large transformer
Input Voltage Monitoring
The row of ten LED’s at the top left of the front panel make up a meter that indicates INPUT VOLTAGE. Only one LED will light up at a time. There are two red LED’s at the endpoints. When lit, they indicate that the input voltage may be above or below the point where it can be restored to the selected nominal output voltage (though it may still be restored to a usable level) but is not high or low enough to cause an extreme voltage shutdown
Output Voltage Monitoring
A green LED labelled OUTPUT IN REGULATION indicates proper function (i.e., that the output voltage of the selected output voltage is within ±10V of the 240V output.Your equipment should worknormallywhenthislightison,andoftenwillworksatisfactorily even when it is off.
Output Current Monitoring
The AR-2330D’s ammeter reads AC current from 0 to 30 amps, in 3-amp steps. Currents above the 30 amp limit read red, with yellow indicating a warning zone. Please keep in mind that the ammeter may not read at all if the total load connected is less than 2 amps (240 watts). This is a likely occurrence if only relatively low power, signal processing-type equipment is connected. With the master switch off, the ammeter can still read, but will only do so if equipment drawing at least 2 amps is connected to the unswitched outlet
The ammeter is capable of giving a reliable indication of current drawn by all kinds of equipment, thanks to its true-RMS- readingcircuitry.Thismeansthatloadslikepoweramplifi ers,which are primarily capacitive and inductive, will read as accurately as purely resistive loads like heaters.Ammeters that respond only to average AC current may vary widely from RMS reading meters.
Design
The AR-2330D uses a design based on an eight-tap toroidal autoformer. The toroidal design assures minimal leakage of stray magnetic fi elds, and, because of its high effi ciency, 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 fl uctuation requires that a different tap be selected, the new tap is electronically switched exactly at the zero-crossing, to avoid distorting the AC waveform. If necessary, it can switch taps as often as once each cycle. Some 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”orunnecessaryswitchingbackandforthbetween adjacent taps. And unlike voltage regulators that employ ferro-resonant transformers, the Furman AR-Series is not sensitive to small errors in line frequency, making them ideal for use with generators
Supply Cable Wiring
The AR-2330D’s rear panel provides a NEMA L14-30P male inlet connector; a NEMA L14-30 cord mounted female connector is included with the unit. Please refer to the “Rear View” wiring diagram at right.
Wire the two hot leads (black) to X and Y (black, and white or red), and the equipment ground (green) to G.
t is essential that all equipment powered by anAR-2330D be properly grounded!
Never cut off the power cord ground pin or use a “cheater” adaptor on any of your equipment!
Installation
The AR-2330D is designed for mounting in a standard 19-inch rack. Because of its weight, the best position for it is at the bottom of the rack. Its toroidal transformer minimizes magnetic leakage, but nevertheless, due to its high capacity, it can radiate an appreciable magnetic field. Therefore, we recommend that it not be positioned adjacent to sensitive, low level signal processors, especially mic preamps, mixers, tape recorders, etc. Power amps may be more suitable “rack neighbors.” As with any rackmount equipment, be sure to use 10-32 machine screws for mounting in the rack’s tapped holes, and to avoid marring the front panel fi nish, use plastic washers under the screw heads
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