Furman Sound PM-PRO User Manual

®

PRO-SERIES 20 AMP
POWER CONDITIONERS

MODELS PM-PRO, PS-PRO, PL-PRO

20 AMP

PRO

SERIES

FEATURES COMMON TO ALL MODELS

● 20 Amp (2400 Watt) rating handles even the largest amps

● Multiple levels of protection components can safely absorb

large spikes and provide highly effective RF filtering — the
most comprehensive protection available anywhere!

● Extreme Voltage Shutdown guards against destructive wiring

faults

● Critical functions are monitored by a “smart”

microprocessor; LED status indicators report on problems

● Precision magnetic circuit breakers (PL-PRO, PM-PRO only)

● Heavy duty 10 foot, 12 gauge line cord

● Eight widely-spaced, switched rear outlets and one

unswitched front outlet

DESCRIPTION

The PRO Series are Furman’s top-of-the-line power
conditioners. They provide the most complete and
comprehensive protection from power line-related transient
voltages, noise, and wiring faults available. Their many special
features were designed specifically to provide maximum
protection from the type of hazards faced by delicate digital
pro audio and video equipment.

Power line disturbances are real, and they are inevitable.
According to Consumer Reports (November, 1994), “One

Top to bottom: PL-PRO, PM-PRO, PS-PRO

significant surge a day is the norm. High-exposure areas may
experience perhaps a hundred smallish spikes a day.” Proper
protection is essential for costly equipment, even more so if it
is frequently moved from location to location. But there is a
wide range of differences in the performance available from
the protection products available.

What sets the PRO Series apart from other conditioners is
the quantity, quality, and configuration of the suppression
devices used. These include MOV’s, gas discharge tubes,
fast-blow fuses, and high voltage inductors and capacitors.
This unique combination can safely absorb and dissipate large
spikes from nearby lightning strikes and other sources (up to
11,000 amps across any wiring mode — line-neutral, line­ground, or neutral-ground), as well as highly attenuate audible
high frequency noise. Precise high-inrush magnetic circuit
breakers avoid the false tripping often encountered with large
reactive loads like power amps.

An additional feature, Extreme Voltage Shutdown, fights a
hazard particularly common in the entertainment industry:
wiring faults — for example, accidental connection to 220V. It
senses voltages that are so high or low that operation would
be impossible (under 80V or over 140V) and shuts the power
down before damage can occur. LED status indicators
(“Protection OK” and “Ground OK”) monitor the integrity of the
protection devices and grounding, and report if the protection
is compromised.

Furman Sound, Inc. ● 1997 South McDowell Blvd. ● Petaluma, CA 94954 USA

Phone: [phone] ● Fax: [phone] ● Web: http://www.furmansound.com

PS-PRO Rear View

120 VAC INPUT

60 HZ

20A MAX

CAUTION:

TO PREVENT ELECTRICAL

SHOCK DO NOT REMOVE

COVER REFER SERVICING

TO QUALIFIED

PERSONNEL ONLY

MAXIMUM

LOAD

20 AMP

MADE IN

U.S.A.

PL-PRO and PM-PRO are similar except the terminal strip is not present.

+12V
GND

REM
IN

THE FOUR PRO-SERIES MODELS

There are three rackmount PRO Series models. The PL-PRO

Power Conditioner/Light Module has the familiar slide-out rack

lights pioneered by Furman. It also provides an accurate, self­checking AC voltmeter that not only measures normal voltages,
but also flashes eye-catching special pattern alerts for off-scale
but not extreme conditions (80-90 or 130-140 volts). A new
feature exclusive to the PL-PRO utilizes microswitches to turn
each light tube off or on automatically when pushed in or pulled
out. The PM-PRO Power Conditioner/Monitor is for applications
where lights are not needed. It features the same AC voltmeter as
the PL-PRO, and adds a true RMS-reading AC ammeter, which
will give a reliable indication of current draw even for highly
nonlinear loads like amplifiers and switching power supplies. The
PS-PRO Power Conditioner/Sequencer is capable of powering
up a rack full of equipment in a 3-step delayed sequence. The
sequence is reversed for power-down. The sequence can be
initiated with either momentary or maintained switches, locally or
remotely . A duplex outlet is provided for each delay step. A front
panel screwdriver adjustment sets the delay time. A locking switch
with a removable key is provided for maximum security . The
PS-PRO also contains special circuitry to detect additional wiring
faults such as reversed hot and neutral, missing ground or
neutral, etc. One or more PS-PROs may be installed in remote
locations and operated via low-voltage wiring.

A fourth model (not shown in the photo), the PowerPort
Remote AC Power Controller, is a half-rack or wall-mount
unit that has all PRO Series protection features and is the
basic 20 amp building block of a permanently wired,
sequenced system that can be expanded to any size. Large
installations drawing hundreds of amps can be accommodated
by daisy-chaining as many PowerPorts as needed. PowerPort
features are described in a separate data sheet.

All PRO Series rackmount models come with a ten foot,
12 AWG power cord, and have eight widely-spaced rear
outlets that can accommodate bulky plug-mounted power
supplies, as well as a front-panel unswitched outlet.

OPTIONS

● “-G” Suffix: provides “super spec”, isolated ground 120V

outlets for special applications. Please consult factory

before ordering to determine suitability in your application.

Architects and Engineers Specifications

The Power Conditioners shall mount in a standard 19"
rack, and shall occupy one rack unit (1

There shall be at least eight switched outlets supplying
conditioned power on the rear panel and one unswitched outlet
on the front panel, with a front panel-mounted 20 amp, high­inrush magnetic circuit breaker rated for use as a master
switch. No outlet shall receive power if the mains voltage is
“extreme” (defined as under 80V or over 140V). Spikes shall
be clamped to no more than 200 V peak in any mode (line to

4-9802

3

/4") of rack space.

neutral, neutral to ground, or line to ground). MOV’s for spike
absorption shall be redundant in each mode, placed across the
lines on both sides of the RF filter, and an additional device
such as a gas discharge tube shall be placed across the hot­neutral mode to absorb spike remnants. Response time shall
not exceed 1 nanosecond. The unit shall absorb a surge
current of up to 11,000 amperes across any mode for 10 ms
without damage. RF noise attenuation shall exceed 40 dB in
both differential and common modes from 1 to 200 MHz. The
AC cord shall be 12 AWG and ten feet long.

Where provided, voltmeters shall read from 90 to 128 volts
in steps of two volts, and shall indicate marginal voltages with
different, easily recognizable flashing patterns for below- and
above-scale conditions. Ammeters shall read from 0 to 20
amps, in steps of two amps, and shall respond to RMS current.
The meter segments shall be color coded, and of sufficient
brightness to be readable in a dark area from a distance of 20
feet. The meters shall read whenever the unit is plugged into
the AC power line. Where rack lights are included, a dimmer
control shall be provided, and the lights shall turn off when
pushed in.

The units shall be the Furman PRO-Series Power
Conditioners.

Three Y ear Warranty

The Furman PRO-Series is protected by a three year limited

warranty covering defects in materials and workmanship.

PRO-SERIES SPECIFICATIONS

Current rating: 20 Amps (2400 Watts at 120 VAC)
Input Voltage: 85 to 264 VAC
Meter Accuracy: Voltmeter: ±2 VAC; Ammeter: ±2 amps,

Spike Protection Modes: Line to neutral, neutral to ground, line to ground
Spike Clamping Voltage: TVSS rating 400V peak, L-N, N-G, L-G (tested

Response time: 1 nanosecond
Maximum surge current: 11,000 amps (8 x 20mS pulse)
Maximum spike energy: 550 joules total
Noise attenuation: Differential mode: Greater than 40 dB; Common

Mechanical: Dimensions: 1.75" H x 19" W x 10" D. Weight: 6

Power Consumption: PM-PRO, PS-PRO: 6 watts

Safety Agency Approvals: UL, C-UL, listed.

The Furman PRO-Series is manufactured in the United States of America.

calibrated with trimpot adjustments

to UL 1449)

mode: greater than 60 dB; both 1 to 200 MHz

lbs (2.7 kg). Construction: Steel chassis, zinc
chromate plating; .125" brushed and black
anodized aluminum front panel; glass epoxy
printed circuit boards.

PL-PRO: 20 watts

LISTED

7Z37