VOLTAGE REGULATORS

AR-1220
AC LINE VOLTAGE REGULATOR
VOLTAGE
REGULATORS
AR-1220
A C L I N E V O LTA G E R E G U L AT O R
Congratulations on your purchase of
a Furman AR-1220 AC Line Voltage
Regulator. The AR-Series regulators
are designed specifically for any audio,
• Fast acting user accessible circuit breaker protects against overload or shorts
• Output capacity 20 amps
• Very low stray magnetic field leakage
video, or computer rackmount system
• On off breaker switch
requiring clean, filtered, and regulated
• Output voltage selector switch
(AR-1220J only)
AC power for optimum operation.
• Rugged, two space rack unit weighs
only 50 lbs. (23 kg.)
AR 1220J NOTE: FIRST SELECT
CORRECT VOLTAGE!
AR SERIES FEATURES
• Nominal output voltages vs.
“in Regulation” ranges:
•
Model
Output
Voltage
In-Regulation Range
Output
Accuracy
AR-1220
120
97 to 141
±5V
AR-1220J
120
97 to 141
±5V
AR-1220J
100
80 to 122
±4V
Usable range for most equipment is an
additional 10% above and below the
capture ranges shown in the table Ten
LED bar graphs for Input Voltage and
Output Current Extreme overvoltage or
undervoltage causes instant shutdown,
protecting equipment
• Extreme Voltage Shutdown indicator LED
1
• Output In Regulation indicator
• 14 regulated, conditioned outlets Twelve
20A outlets on the back panel, two 15A
outlets on the front
Before using your model AR 1220J Voltage Regulator, be sure that the output voltage switch on
the rear panel is correctly set for the AC voltage
required by your equipment Each item of equipment
that you intend to power with the AR 1215J Voltage.
Regulator should have its required voltage indicated
on it, usually on the rear near the cord. If in doubt,
consult your dealer.
GENERAL INFORMATION
Furman Voltage Regulators are intended to protect sensitive electronic equipment from problems
caused by AC line voltage ir-regularities brownouts
or overvoltages that can cause audio to-nal changes, digital equipment malfunction (such as loss of
MIDI programs or other data), or, in extreme cases,
permanent damage. They accept input voltages
over a wide AC voltage range (see table at left) and
convert them to, and stabilize them at, the desired
national voltage standard, ±5V. Voltages approximately ±10% beyond that range may be converted
to usable levels, depending on the requirements of
AR-1220
A C L I N E V O LTA G E R E G U L AT O R
the equipment, see figure 1.
The AR-1220 has twelve 20A outlets on the back,
and two 15A outlets on the front. All are functionally
interchangeable. The outlets are regulated, spike
suppressed, and filtered against FIR with a 3 pole
filter, making the unit a full function power conditioner. There are no controls except an on off breaker
switch. (The AR-1220J also has an output voltage
selector switch.)
Limitations: These Line Voltage Regul ators are for
use with AC voltage only. DC voltages should never
be applied to them. Also, they do not change or
regulate line frequency. The output frequency will
always be the same as the incoming line frequency.
MAXIMUM LOAD
The AR 1220 can handle loads totalling up to 20
amperes as long as the input voltage is equal to
or above 124 volts. For voltages below that level,
its capacity must be derated at approximately .10
amperes per volt. See figure 2. As a practical matter, therefore, to cope successfully with worst case
brownout condi-tions, you should plan your total
load so that it does not exceed 16.5 amps, or 1980
watts. Please note that this refers to the aggre-gate
power requirement of all equipment plugged into the
Voltage Regulator, not to each individual item.
EXTREME VOLTAGE PROTECTION
The AR Series includes special circuitry to sense
over and un-der voltages and positively shut down
the output before possible damage is done. For the
AR-1220, overvoltages are those over 150V (135V
in 100V mode). When the input voltage exceeds
that limit, the power will cut off. It will come back on
automatically when the overvoltage is removed as
long as the voltage has not exceeded 300V. The red
LED labelled EXTREME VOLTAGE SHUT-DOWN
indicates the shutdown condition. The output is also
shut down for extremely low input voltages (those
below 75V, or 65V in 100V mode).
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 are one circuit breaker and 8 internal fuses in
the AR-1220.
1. A fast blow 20 amp circuit breaker is used as the
on/off switch. This breaker will trip if the unit’s
20 amp capacity is exceed-ed at any time. If the
circuit breaker is tripped, the on/off switch will
switch off. To reset it, push the switch back to the
on position.
2. A fast blow 1/4 amp fuse is located inside the
unit. This fuse will blow if the unit has been
connected to a voltage that is above the range
of the Extreme Voltage Shutdown circuitry (approximately 300V). To replace it, the unit must
be completely disconnected from all power and
removed from its rack. The six hex head screws
and one Allen head screw holding the top cover
must be removed.
NOTE: There are two different types of internal
fuses. There are seven 30 amp fuses to protect
the voltage switches against faults in the control
circuits (see the section on Design), and the 1/4
amp fuse mentioned above, to protect the small
transformer against line voltages greater than 300V.
For continued protection, replace fuses only with the
exact same type and rating. The internal fuses are
lo-cated on the main circuit board.
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 nomi2
AR-1220
A C L I N E V O LTA G E R E G U L AT O R
nal 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.
The AR 1220J has switchable output voltages, and
also has multiple scales on the Input Voltage meter
corresponding to the selected voltage.
OUTPUT VOLTAGE MONITORING
A green LED labelled OUTPUT IN REGULATION
indicates proper function (i.e., that the output voltage
is within ±5V of the selected output voltage). Your
equipment always will work normally when this light
is on, and often will work satisfactorily even when
the OUTPUT IN REGULATION LED is off.
If you wish to monitor your AR-1220’s output voltage more pre-cisely, you may want to use a Furman Sound PL PLUS Power Conditioner and Light
Module in conjunction with it. The PL-PLUS is the
perfect complement to a Furman Voltage Regulator
to assist in rack power distribution. It offers a 20 LED
bar graph line voltage meter to monitor the incoming
line (the Voltage Regulator output), twin slide out,
swiveling lights with a dimmer control for equipment
illumination, and eight additional outlets with their own
spike and surge protection and RFI filtering.
DEFINITIONS
VOLTAGE REGULATION. The AC line voltage is a
number indicating the nominal electrical potential
that has been adopted in a region for powering
electrical equipment of all kinds. In most of North
America it is 117 120 volts AC; in Japan, 100 volts;
and in many other countries 220, 230, or 240 volts.
The actual voltage can fall below or rise above this
nominal level due to brownouts, power cutbacks,
use of substandard wiring, and other causes. These
deviations can cause poor performance or malfunction. 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.
SPIKE: A pulse of energy on the power line. Spikes
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can have voltages as high as 6000 volts. 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. Spikes can also foul switch
contacts and degrade wiring insulation. They are
an unavoidable component of electric power. 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.
RF11EMI 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. Because noise occurs at higher frequencies
than the 50 or 60 Hz AC line, it can be effectively
reduced through use of low pass filtering.
INSTALLATION
Because of their toroidal transformer design, Furman Voltage Regulators may be positioned near
most other equipment without fear that the other
equipment will be disrupted by leakage of a strong
50/60 Hz magnetic field. Nevertheless, suggested
rack lo-cations would be either at the top or bottom.
As with any rack-mount equipment, be sure to use
10 32 machine screws for mounting in the rack’s
tapped holes (this is not a metric size). In particular,
beware of 10 24 screws, which may fit if forced but
which will strip the threads. To avoid marring the
front panel finish, use plastic washers under the
screw heads.
AR-1220
A C L I N E V O LTA G E R E G U L AT O R
DESIGN
The AR 1220 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 com-pact size for
its rating. The Voltage Regulator’s circuitry monitors
the incoming line voltage with each cycle, comparing
it to ar extremely precise voltage reference, accurate
to ±0.15%. If a voltage e 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. If necessary, it can switch
taps as of-ten as once each cycle. 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. And unlike those voltage regulators
that employ ferro resonant transformers, Furman
Voltage Regulators are not sensitive to small errors
in line frequency, making them ideal for use with
generators.
ONE YEAR LIMITED WARRANTY
Furman Sound, Inc., having its principal place of business at 1997 South McDowell Blvd., Petaluma, CA
94954 (“Manufacturer”) warrants its AR-1220 (the “Product”) as follows:
Manufacturer warrants to the original Purchaser of the
Product that the Product sold hereunder will be free from
defects in material and workmanship for a period of one
year from the date of purchase. The Purchaser of the
product is allowed fifteen days from the date of purchase
to complete warranty registration by mail or on-line at the
Furman website. If the Product does not conform to this
Limited Warranty during the warranty period (as herein
above specified), Purchaser shall notify Manufacturer in
writing of the claimed defects. If the defects are of such
type and nature as to be covered by this warranty, Manufacturer shall authorize Purchaser to return the Product
to the Furman factory or to an authorized Furman repair
location. Warranty claims should be accompanied by
a copy of the original purchase invoice showing the
purchase date; this is not necessary if the Warranty Registration was completed either via the mailed in warranty
card or on-line website registration. Shipping charges
to the Furman factory or to an authorized repair location
must be prepaid by the Purchaser of the product. Manufacturer shall, at its own expense, furnish a replacement
Product or, at Manufacturer’s option, repair the defective
Product. Return shipping charges back to Purchaser will
be paid by Manufacturer.
THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Manufacturer does not warrant
against damages or defects arising out of improper or
abnormal use of handling of the Product; against defects
or damages arising from improper installation, against
defects in products or components not manufactured by
Manufacturer, or against damages resulting from such
non-Manufacturer made products or components. This
warranty shall be cancelable by Manufacturer at its sole
discretion if the product is modified in any way without
written authorization from Furman Sound. This warranty
also does not apply to Products upon which repairs have
been affected or attempted by persons other than pursuant to written authorization by Manufacturer.
THIS WARRANTY IS EXCLUSIVE. The sole and
exclusive obligation of Manufacturer shall be to repair or
replace the defective Product in the manner and for the
period provided above. Manufacturer shall not have any
other obligation with respect to the Products or any part
thereof, whether based on contract, tort, strict liability
or otherwise. Under no circumstances, whether based
on this Limited Warranty or otherwise, shall Manufacturer be liable for incidental, special, or consequential
damages. Manufacturer’s employees or representatives’
ORAL OR OTHER WRITTEN STATEMENTS DO NOT
CONSTITUTE WARRANTIES, shall not be relied upon
by Purchaser, and are not a part of the contract for sale
or this limited warranty. This Limited Warranty states
the entire obligation of Manufacturer with respect to the
Product. If any part of this Limited Warranty is determined to be void or illegal, the remainder shall remain in
full force and effect.
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AR-1220
A C L I N E V O LTA G E R E G U L AT O R
SERVICE
Before returning any equipment for repair, please
be sure that it is adequately packed and cushioned
against damage in shipment, and that it is insured.
We suggest that you save the original packaging
and use it to ship the product for servicing. Also,
please enclose a note giving your name, address,
phone number and a description of the problem.
NOTE: All equipment being returned for repair
must have a Return Authorization (RA) Number.
To get an RA Number, please call the Furman
Service Department, (707) 763-1010, ext. 120 or
121, between 8 a.m. and 5 p.m. U.S. Pacific Time,
or fax to (707) 763-1310. Please display your RA
Number prominently on the front of all packages.
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AR-1220
A C L I N E V O LTA G E R E G U L AT O R
AR-1220 SPECIFICATIONS
Current Rating:
20 amperes for input voltages of 104/124* or higher;
derate at .15 A per volt to a minimum of 16.5A
“In Regulation” Ranges:
Provides regulation ±5V in 120V mode from 97 to 141V;
(AR-1220J only: Provides regulation ±4V in 100V mode
from 80 to 122V)
Shutdown Range:
120V mode: Below 75V or above 150V. (AR-1220J: 100V
mode: Below 65V or above 135V)
80 joules per node; 240 joules total
Noise Attenuation:
Differential mode: Greater than 40 dB
Transverse and common modes: Greater than 60 dB,
1-200 MHz
Dimensions:
3.5” H x 19” W x 17” D (8.9 x 48.3 x 43.2 cm)
Weight:
35 lbs. (16 kg)
Voltmeter Accuracy:
±5V
Spike Protection Modes:
Line to neutral, neutral to ground, line to ground
Spike Clamping Voltage:
Initial turn-on at 200V; TVSS rating of 400 volts peak at
500 A, L-N, N-G, L-G (tested to UL-1449)
Response Time:
1 nanosecond
Maximum Surge Current:
6,500 amps (8 x 20 µs pulse)
Maximum Spike Energy:
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112103-A
Furman Sound, Inc.
1997 South McDowell Blvd.
Petaluma, California 94954-6919 USA
Phone: 707-763-1010
Fax: 707-763-1310
Web: www.furmansound.com
E-mail: info@furmansound.com
Made in China