Furman AR-PRO User Manual
AR-PRO
AC LINE VOLTAGE REGULATOR
AR SERIES
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
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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