Page 1
AR-PRO
AC LINE VOLTAGE REGULATOR
AR SERIES
Page 2
AR-PRO – AC LINE VOLTAGE REGULATOR
AR-PRO AC Line Voltage Regulator. The AR-
ing clean, fi ltered, and regulated AC power for
that may have occurred in shipping. Any such dam-
age is the responsibility of the carrier. If necessary,
fi le a claim directly with them.
2. The AR-PRO is a complex electronic instrument with
various wiring options. You cannot simply “plug in and
go.” The supply cable must be adequate for your in-
stallation needs. Take the time to read this manual,
especially the sections on Installation and Opera-
tion. If in doubt, obtain the assistance of a licensed
electrician.
3. To insure full protection under the terms of the Lim-
are lost, please fi ll out and return the Warranty
serial number on your unit.
Delivers 120 VAC ±4%
264 volts AC, 50/60 Hz, single phase
Extends the usable voltage range for
Input voltmeter bar-graph with 21 LEDs
Output ammeter bar-graph with 21 LEDs
Fourteen regulated, conditioned outlets
Input capacity 30 amps; output capacity
22.5 to 30 amps
Provision for remote turn-on/turn-off;
ously or in a delayed sequence
Multiple-stage transient (spike) suppres-
sion
Multiple-stage RFI fi ltering
Low stray magnetic fi eld leakage
Compact 3.5” rack-mount unit weighs
only 50 lbs (23 kg)
AR-PRO DESCRIPTION
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AR-PRO – AC LINE VOLTAGE REGULATOR
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The AR-PRO is intended to protect computer, audio,
video and other electronic equipment from problems
caused by AC line voltage irregularities - sags, brown-
outs or over voltages that can cause sensitive digital
equipment to malfunction, or, in extreme cases, to
sustain damage. It accepts single phase input AC
voltages anywhere within two capture ranges, 88
to 134V (low range) or 170 to 264V (high range) and
converts them to the North American standard 120 volts
on how far out of range they are and what is considered
voltage from 80 to 267 will be
converted to 120V ±4%. See Figure 1 below.
The AR-PRO can handle loads totaling up to 30
amperes as long as the input voltage is equal to or
above 120 volts (low range) or 240 volts (high range).
derated at approximately one-quarter ampere per volt.
a special AC confi guration, accidental connection to
disastrous consequences.
component of a power distribution scheme suitable
for worldwide use, accommodating national voltages
of 100, 120, 220, 240, or others, with equal ease and
without the need for readjustment.
The AR-PRO uses a design based on a 25-tap toroidal
autotransformer. The toroidal design assures minimal
compact package. The AR-PRO’s circuitry monitors
the incoming line voltage with each cycle. If a volt-
age change requires that a different tap be selected,
the new tap is electronically switched in precisely at
the zero-crossing, to avoid distorting the AC waveform.
once each cycle. Most commercial voltage regulators
voltage
spikes! And unlike voltage regulators that employ Ferro
120
122
124
126
128
130
132
114
116
118
110
112
Output Voltage
-No Output-
208
Input Voltage
108 112 116 12010492 96 100 124 128 132 136 142888480
160 176 184192 200 216 224 232 240 248256 264
TWO VOLTS PER DIVISION FOUR VOLTS PER DIVISION
168
Low Range�
Input Voltage
High Range�
Input Voltage
208
Input Voltage
108 112 116 12010492 96 100 124 128 132 136
142
888480 160 176 184192 200 216 224 232 240 248256 264
TWO VOLTS PER DIVISION FOUR VOLTS PER DIVISION
168
Low Range�
Input Voltage
High Range�
Input Voltage
29
30
27
28
25
26
Output Current
24
23
22
21
20
Functional Range
Regulation Range
Regulation Range
Functional Range
FIGURE 1: OUTPUT VOLTAGE VS. INPUT VOLTAGE
FIGURE 2: AVAILABLE OUTPUT CURRENT VS. INPUT VOLTAGE
AR-PRO GRAPHS
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AR-PRO – AC LINE VOLTAGE REGULATOR
small errors in line frequency, making it ideal for use
with generators.
The AR-PRO has twelve convenience outlets on its
a master circuit breaker, which serves as an on-off
switch. Two bar-graph meters, each comprised of 21
other LEDs indicate proper function (i.e., the output
voltage is either within ±5% of desired output, or above
or below that range). One or more units may be turned
on remotely, either simultaneously or in sequence, by
switching an internally-derived DC control line.
The AR-PRO is housed in a double space (3.5” high
and 17” deep) rack-mount chassis, and weighs only
50 lbs (23 kg). It is made of extremely rugged heavy-
gauge black powder coat steel. Adjustable rear rack
ears (RPM-2, sold separately) allow it to be secured
female cable-mount connector, ready to terminate your
own custom supply cable.
To precisely monitor the AR-PRO’s output voltage,
you may want to use one or more Furman
Furman’s
for rack power distribution. Voltage meters monitor the
and eight additional outlets provide spike/surge protec-
tion and RFI fi ltering.
AR-PRO LIMITATIONS
AC power is, to some extent, unpredictable. The
available voltage may vary from place to place and
from moment to moment. The waveform may not be
a perfect sine wave, and high or low frequency noise
country in terms of voltage and frequency.
The AR-PRO is intended to reduce to the greatest
extent possible, the impact of these irregularities. How-
ever, you should be aware that there are certain things
2. Protecting from complete loss of power (blackouts).
3. Performing frequency conversion to 60 Hz.
4. Isolating ungrounded equipment.
5. Handling multiple-phase power.
sible to include a complete supply cable with your
AR-PRO. A cable-mount connector that mates with the
AR-PRO’s twist-lock connector is supplied, but it is up
to the user to connect it to a cable with the appropriate
gauge, number of conductors, length, and source-end
connector. This section is intended to assist in deter-
the twist-lock connector.
at least 10 AWG*
cable of
at least 14 AWG
should be used, depending on distance from the pow-
er source.
fl exibility and abrasion resistance. It is permissible to
and is not recommended.
* American Wire Gauge
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AR-PRO – AC LINE VOLTAGE REGULATOR
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connector:
All wiring confi gurations except North America
220-240V:
Wire hot lead to X (black in North America; black,
Wire the equipment ground to G (green in North Amer-
Wire the two hot leads to
X and Y (black, and white or red), and the equipment
ground to G (green). Since the USA 220-240 doesn’t
all equipment powered by an AR-PRO be properly
grounded! Never cut off the power cord ground pin
or use a “cheater” adaptor on any of your equip-
When dealing with high currents such as those handled
sidered part of the load. As such, the length, gauge,
and temperature rating of the insulation must be taken
than about 20 feet (7 meters). The smaller the cable
conductors are, the more fl uctuation of input voltage
there will be. This is due to the greater voltage drop.
drop to 1 volt per 45 feet (15 meters). Bigger is defi -
The connector used at the source end should be rated at
for low range operation. If in doubt, consult a licensed
electrician when installing your AR-PRO.
small for a device capable of handling 30 amps, this
AR-PRO immediately adjacent to equipment which
would make better “rack neighbors.” If excessive hum
or buzz is present in the audio signal, you may be able
to reduce or eliminate it by leaving more empty spaces
tom, with the bottom preferred due to the AR-PRO’s
weight. Because the AR-PRO generates considerable
with any rack-mount equipment, be sure to use 10-
32 machine screws for mounting in the rack’s tapped
fi t, if forced, but will strip the threads. To avoid marring
the front panel fi nish, use plastic washers under the
screw heads.
Adjustable rear rack ears (RPM-2, sold separately)
to use them when mounting the AR-PRO in any rack
substitute securely mounted blocks of wood.
The rear rack ears can be attached to the wood blocks
with wood screws. They can be adjusted to any rail-
to-rail spacing from 17 to 18.5 inches by loosening the
three adjusting screws on each side, sliding the ears to
a new position, and retightening them.
125/250V
.
30A.
NEMA
L14-30
G
W
X
Y
(EQUIPMENT�
GROUND)
(NEUTRAL)
(HOT LEAD)
(USA 220-240 ONL
Y)�
FRONT VIEW
REAR VIEW
G
W
X
Y
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AR-PRO – AC LINE VOLTAGE REGULATOR
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ther of two ranges. The appropriate range is selected
automatically and is indicated by an LED at the end
of the scale. All LEDs are green except those at the
extreme high and low ends, which are yellow. (Model
AR-PRO-J has a 120V/100V switch on the rear pan-
el. When it is set to 100V, use the blue scale for the
continues for more than a few seconds, the circuit
operating range. The LEDs are green within this range, and
dicates whether the output voltage is within 5% of
will light green when IN REGULATION, & yellow if 5%
The yellow lights come on only when the input voltage
front panel control. Its function is to select the correct
with cable wiring in conformance with USA electrical
codes. This switch is necessary because the United
ferent AC wiring scheme.
The upper position is for any
situation in which the AR-PRO is
fed either 120V or 100V, or 220V
to 240V in a non-North American
country. This corresponds to a
two-wire scheme (hot-neutral).
The lower position should be
selected only when running the
AR-PRO off 220V/240V
This corresponds to a three-wire
scheme (hot-neutral-hot), even
the supply cable
four-pin twist-lock supply connector. It does not select
the voltage range (that is done automatically). Therefore,
the AR-PRO will simply not receive power and will not
operate. No damage will be done.
restored when the switch is reset correctly.)
INPUT SELECT
100/200
OR NON-USA
220/240 VAC
USA 220/240 VAC
Voltage and Current
Over/Under Voltage
and “In Regulation”
AC Power Switch and
30 Amp Magnetic Circuit
Current Breaker for off-shore
220-240 V operation
Page 7
AR-PRO – AC LINE VOLTAGE REGULATOR
at the input (where the circuit breakers are located) will
also 120V (low range). If the AR-PRO is powered from
a 220/240 volt source (high range), the input current
will be approximately half, or 15 amps, to produce
the rated 120V, 30A at the output. Therefore, safety
considerations require a separate 15A breaker which
supply voltage is used. This breaker trips by popping
out. If it trips, decrease the load on the AR-PRO and
switch. It is actually a 30 ampere magnetic-trip circuit
through the AR-PRO exceeds 30 amps at any time,
the breaker will trip by snapping into the off position.
and turn it back on.
After turning the Power switch on, there is a delay of
approximately 3 seconds before power is available at
the AR-PRO’s output.
tor is rated at 30 amperes for 120/240 volt service.
supply cable. 120V/100V SWITCH (Model AR-PRO-J
only): The AR-PRO-J can supply 120 VAC for use with
equipment intended for North America, or 100 VAC
for equipment intended for use in Japan and other
countries. Choose the setting that matches the type of
equipment you plan to power with the AR-PRO-J.
TERMINAL STRIP FOR REMOTE OPERATION: Con-
AR-PRO to be turned on remotely, or for multiple
AR-PROs to be turned on remotely, either simultane-
ously or in a delayed sequence. A built-in delay of
approximately half a second is available to stagger
the potentially large inrush currents that occur when
certain types of equipment are powered up simulta-
details. Note: No connections or jumpers are needed
for normal AR-PRO operation.
the load on any one individual outlet may not exceed
type of connector used.
30 A Inlet
Output Voltage Selector Switch (J Version Only)
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AR-PRO – AC LINE VOLTAGE REGULATOR
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A R - P R O
A N S W E R S
A. In most cases, power will not reach the AR-PRO’s
will resume as soon as the switch is restored to the
correct position. The only exception to this rule would
connected to
a USA source of 240V. In that case, the
wrong setting will result in the AR-PRO running off half
the line (120V-i. e.,
the low range).
The AR-PRO will
function normally, but there is a minor disadvantage to
switch result in damage.
A. 240V. Since an output of 120V at 30 amps requires
only 15 amps in the supply cable at 240V, you can use
a lighter gauge of wire in the supply cable (see section
on Installation for details). Also, the smaller current
the internal components of the AR-PRO to run cooler
and therefore may prolong its service life.
ning strikes?
A. Maybe. If lightning strikes a distant power line and
causes a relatively small disturbance to reach your
absorb the excess voltage invisibly and harmlessly.
the AR-PRO is installed (or somewhere very nearby),
equipment damage may be unavoidable due to the ex-
tremely high voltage and current present. If this does
occur, most likely damage to the AR-PRO itself will be
varistors or MOVs), which should be a relatively minor
Any
AR-PRO known to have taken
a direct lightning
appear to be working normally, but its vital spike-sup-
You should not rely on the AR-PRO to protect against
a direct lightning hit. That is not its purpose, and
damage caused by lightning is specifi cally excluded
from its warranty. Your fi rst line of defense against
your building’s electrical service entrance. If your
company or an electrical contractor to have one installed.
A. We recommend against this because of the high
their large power supply capacitors when fi rst turned
on. This could cause the AR-PRO’s circuit breaker to
trip even though the steady-state load is well within
at a time with their own on-off switches, waiting a few
seconds between each. (Furman’s
will do this for you automatically).
equipment. However, the general rule is that the func-
tion of the AR-PRO’s circuit breaker is no different from
any other circuit breaker. If turning on any combina-
tion of equipment simultaneously without the AR-PRO
causes a house breaker to trip, adding the AR-PRO
will not decrease the likelihood of this.
rent jumps up and the breaker trips. Why?
A. The current used by many kinds of audio equip-
an important difference, however. When a VU meter
goes to the top of its scale, an overload light may go
on and you may hear some distortion. But when you
try to draw too much current through the AR-PRO, its
circuit breaker will trip and shut all your equipment off
- a much more serious and inconvenient occurrence.
scale if the input voltage is lower than 120. Therefore,
to exceed more than two-thirds of maximum on the
Page 9
AR-PRO – AC LINE VOLTAGE REGULATOR
- 9 -
A. This built-in delay allows the internal sensing cir-
cuitry to stabilize and provides a means of turning on a
group of AR-PROs in a delayed sequence.
A. Some European countries are using GFI circuits
that will disconnect the load on sensing approximately
3 mA of ground current. This relatively small current
can be created by the fi lters whose purpose is to clean
ground. In doing so, these fi lters can create the very
the GFI is unavoidable, the only way to alleviate this
ground. If this becomes necessary, consult the factory
for assistance.
closer to 5 mA and are therefore generally not a prob-
A. Switching power supplies are frequently used in
video gear, lighting controllers, computers, and a
variety of programmable logic controllers for controlling
of current being drawn by equipment using switching
supplies may appear well under the AR-PRO’s 30 amp
severely overloaded for its rating. If your load appears
well within limits yet things are running hot, breakers
are tripping, and/or transformers are buzzing, you may
ging some equipment and power it through a different
circuit.
your line is doing so. Your utility company may be able
to help you determine the cause.
control voltage. This can be very convenient in cer-
tain situations; for example, turning on amplifi ers on
a stage from a sound booth in the rear of a hall. The
control signal can be safely routed through wiring no
signal is DC, so it will not cause noise in adjacent
audio lines. The necessary voltages are generated
and a SPST switch.
All connections for remote operation are made
through the screw terminal strip on the rear panel.
There are three recommended confi gurations:
Single AR-PRO, local turn-on only:
Turn-on/off is
with the Power switch on the front panel. No wires
or jumpers should be connected to the terminal
strip.
Single AR-PRO, remote turn-on:
switch between the Remote Out and Remote In
terminals. Leave the front panel Power switch in
the ON position. When the switch is open, the AR-
Multiple AR-PROs, remote turn-on in delayed
sequence:
A built-in delay of approximately a
quarter second is automatically provided to stag-
ger the potentially large inrush currents that occur
when certain types of equipment are powered up
simultaneously. Using such a delayed sequence
can avoid blowing a house breaker when all the
AR-PROs are powered from the same circuit.
To create a remote delayed sequence, all front panel
fi rst) is connected to the Remote Out of the second unit.
The Delay Out of the second AR-PRO is connected to
the Remote Out of the third unit, and so forth for addi-
tional units.
The master on-off switch must be connected to the
Page 10
AR-PRO – AC LINE VOLTAGE REGULATOR
- 10 -
The diagram above illustrates a set of three AR-PROs
connected for remote turn-on in delayed sequence.
When the switch is opened, unit 1 turns on after 3
seconds. Unit 2 turns on a quarter second later, and
domestic market or for use in other countries with
output. Note that there is a blue scale on the INPUT
VOLTAGE meter on the front panel for 100V use.
The capture range of the AR-PRO in 100V mode (the
94954 (“Manufacturer”) warrants its AR-PRO (the
“Product”) as follows:
Manufacturer warrants to the original Purchaser
of the Product that the Product sold hereunder will
a period of one year from the date of purchase. The
the date of purchase to complete warranty registration
does not conform to this Limited Warranty during the
warranty period (as herein above specifi ed), Purchaser
shall notify Manufacturer in writing of the claimed de-
fects. If the defects are of such type and nature as to
thorize 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 Registra-
tion 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 loca-
tion must be prepaid by the Purchaser of the product.
the defective Product. Return shipping charges back to
THE FOREGOING IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
TICULAR 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 installa-
tion, against defects in products or components not
or components. This warranty shall be cancelable by
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
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
of the contract for sale or this limited warranty. This
facturer with respect to the Product. If any part of this
the remainder shall remain in full force and effect.
��
�
AR-PRO #1
REM OUT�
REM IN�
DELAY OUT�
GND
�
AR-PRO #3
REM OUT�
REM IN�
DELAY OUT�
GND
�
AR-PRO #2
REM OUT�
REM IN�
DELAY OUT�
GND
Page 11
AR-PRO – AC LINE VOLTAGE REGULATOR
The A.C. line voltage
tial that has been adopted by a region for powering
electrical equipment of all kinds. In the United States
and Canada it is 120 volts; in Japan, 100 volts; and
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
vice 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.
A pulse of energy on the power line. Spikes
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
caused unpredictably by electric motors switching on
or off (on the premises or outside), utility company
factors. Spikes (also called surges or transients) are
absorbed by special components in the AR-PRO to
than is found in spikes, but it is continuous rather than
transient in nature. It is not likely to cause damage, but
circuits, “snow” on video screens, or garbled data in
computers. Noise can be introduced into AC lines by
electric motors, and others. Because noise occurs at
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 de-
scription of the problem.
NOTE: All equipment being returned for repair must
Page 12
Web: www.furmansound.com
AR-PRO SPECIFICATIONS
Current rating:
30 amperes for input voltages of 120 (low range) or 240 (high
range) or higher; derate at .25A per volt to a minimum of
22.5A
Functional range 80 to 267VAC; provides regulation ±4% in
ranges 88-134 and 170-264 VAC
Voltmeter ±2 VAC; Ammeter, ± 10%; factory calibrated
Spike Protection Modes:
Line to neutral, neutral to ground, line to ground
Clamping Voltage, line to neutral, neutral to ground:
250 Volts peak (130V rms=184V peak)
Clamping Voltage, line to ground:
500 Volts peak
1 nanosecond
5,000 amps (8 x 20 ps pulse)
455 joules total
>50 dB, 1 to 120 MHz
Common mode:
20 dB at 150 kHz, rising to >40 dB, 1 to 120 MHz
3.5” H x 19” W x 18.5” D
Weight:
50 lbs.
Construction:
All steel chassis, powder coated; supplied with front handles
and rear rack ears; FR-4 glass epoxy circuit boards
Adjustable rack ears, RPM-2, are sold separately.
0005-030903-C
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