Furman Sound Power Supply IT 20 II User Manual

 
IT-20 II - Owner’s Manual  
IntroductIon  
InstallatIon  
Thank you for your purchase of a Furman IT- The power source to which the IT-20 II is  
20 II 20 amp Balanced Power Conditioner, connected must be adequate for use at 20 amps.  
and congratulations on your choice. This We recommend a ꢀ0 amp circuit, wired with  
specially wound and shielded toroidal isolation 10 gauge wiring, if continuous operation near  
transformer is designed specifically to reduce 20 amps is anticipated. A dedicated (nothing  
hum pickup by sensitive equipment when ultra- else connected) 20 amp circuit is the minimum  
low-noise is a must.  
acceptable to comply with NEC requirements.  
Consult a qualified electrician if in doubt. The IT-  
20 II is designed for mounting in a standard 19  
inch equipment rack. Because of its weight, the  
best position for it is the bottom slot of the rack.  
Its toroidal transformer minimizes magnetic  
leakage, but nevertheless, due to its high  
capacity, it will 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.”  
descrIptIon  
Designed for the most critical, ultra-low noise  
installations, the IT-20 II can supply 20 amps  
of Balanced AC power for recording studios,  
broadcast stations, or video production facilities.  
To understand the incredible need for clean  
noise-free AC power, it’s important to note that  
today’s sophisticated studio equipment features  
tremendous dynamic range. Most of the signal  
content that defines high resolution such as  
harmonics, instrument timbre, high frequency  
extension, spatial cues, and fast transient  
attacks in audio are inherently low in signal  
level. Further, when AC noise is induced into  
audio processors, pre-amplifiers, microphones,  
powered monitors, computers, and mixing  
consoles, the all important low level signals are  
distorted or masked. Once signals are masked  
there is no way to retrieve the lost content.  
Advanced AC filtering is critical when audio or  
video resolution is at stake. With Furman’s IT-20  
II, for the first time you will hear audio content  
and see video images as they were meant to be  
- pristine. Add to this our SMP+ non-sacrificial  
surge suppression, E.V.S. protection, Linear  
FilteringTechnology(LiFT), andlaboratorygrade  
digital voltmeter and you will be assured that AC  
noise and surges are a thing of the past.  
The maximum benefit is derived from balanced  
power when it powers ALL equipment in an  
installation. Therefore, try to position the IT-20  
II in a central location so its power can be easily  
distributed everywhere it’s needed. If the total  
power consumption of all equipment exceeds 20  
ampsat120volts,deletehighlevelormechanical  
devices first (such as power amps, motors). If  
possible, physically isolate any equipment that  
has to be powered with conventional power  
through a different circuit, and route their AC  
cords away from all other cabling. The balanced  
power produced by the IT-20 II is restricted to  
use with electronic equipment only. Balanced  
power may not be used for lighting equipment,  
and access must be limited to use by qualified  
personnel only.  
If you are installing the IT-20 II in a rack that  
has rear as well as front mounting rails, you may  
wish to order adjustable rear rack ears from  
Furman. These allow the IT-20 II to be securely  
attached in both the front and back. Order model  
RRM-2.  
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IT-20 II - Owner’s Manual  
manyAC noise contaminants may be present on  
theAC ground wire. For these reasons Furman’s  
IT-20 II contains a Ground Lift Switch.  
operatIon  
cIrcuIt Breaker/swItch  
The IT-20 II has a large black switch on the front  
panel that is both a precision circuit breaker and  
an on-off switch. If circuit breaker is tripped,  
manually reset the unit by turning it off and then  
back on, to restore power.  
This switch floats the output ground, eliminating  
ground noise and also, in many instances, the  
hum and buzz associated with ground loops.  
The IT-20 II’s GFCI protection circuit assures  
that even when utilizing the power conditioner  
in this mode, operation is safe and secure.  
In fact, even if a connected component has  
a catastrophic failure, less than 5 milliamps  
current imbalance from line to ground or neutral  
to ground will instantly disconnect the voltage  
output from the IT-20 II. This is far safer than  
any conventional 120 VAC outlet, and it has  
numerous noise reducing advantages.  
Ground Fault Interrupter (GFcI):  
The GFCI on the IT-20 II’s front panel is a special  
kind of circuit breaker that detects an imbalance  
in the current flowing in the two hot legs. The  
“missing” current is presumed to be flowing  
through the ground conductor (the round pin on  
an AC outlet).  
However, ground wiring in any studio, broadcast  
or club environment can be complex. Because  
all 14 outlets of the IT-20 II are in parallel,  
it is still possible to have a ground loop if the  
two offending products are simultaneously  
connected to a single IT-20 II. Use of multiple  
IT-20 II’s may be necessary in extreme cases.  
Also, for studio and broadcast use, separating  
all digital processing products from all analog  
devices is highly recommended and can be  
accomplished by using two IT-20 II’s.  
Ground current often indicates a dangerous  
partial or full short circuit. If an imbalance is  
detected, the GFCI trips and cuts off power not  
only to itself, but to all the IT-20 II’s outlets. If  
this occurs, the button on the GFCI marked  
“R” (Reset) will pop out. To restore operation,  
correct the fault and push the button in. You may  
test the proper operation of the GFCI at any  
time by simulating a ground fault by pushing the  
button marked “T” (Test). If the GFC1 is working  
properly, this will cause the “R” button to pop  
out and cut off power. You can restore operation  
after a test by pushing the “R” button in.  
Intheend, itisbesttoexperimentwiththisswitch.  
Whichever position yields the least noise or  
clearest audio / video recording or reproduction  
is the position that should be utilized.  
Ground lIFt swItch  
Balanced ac power  
Ground loops are fairly common in many  
installations because AC cords with safety  
ground are rarely connected to a single low-  
resistance buss bar. When there is a significant  
In much the same way that balanced audio lines  
can reduce the pickup of hum and other types  
of electromagnetic interference (EMI), the use  
of balanced AC power lines in sensitive audio,  
video, or computer installations can make an  
enormous difference in system noise and signal  
integrity. But power distribution in NorthAmerica,  
unfortunately, is not balanced. The distribution  
standards currently in use were derived from  
difference in voltage between  
a
source  
component’s neutral and ground and a load  
component’s neutral and ground, the buzz and  
hum associated with this type of ground current  
noise (or loop) may take place. Additionally,  
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IT-20 II - Owner’s Manual  
practices established over a century ago, when Asymmetrical noise, or what is called “differential  
electric power use was limited to lighting and mode,” is responsible for well over half the noise  
motors, long before any AC noise sensitive present in today’s AC lines. For this reason we  
applications existed. The emphasis then was on employ our exclusive Linear FilteringTechnology  
convenience (from the power utilities’  
(LiFT). This assures that your audio, video, or  
standpoint)andsafety,butnotnoisecancellation. computer signals are as pure and uncorrupted  
The result was a three-wire distribution scheme as possible.  
in which 120V branch circuits have a hot wire  
and a neutral wire, with the neutral tied to a third  
wire connected for safety to an earth ground.  
The third wire does not carry any current  
unless there is a fault. This unbalanced scheme  
can create hum in audio circuits for two main  
reasons. First, the current flowing in the hot wire  
induces hum in any other nearby wires, which  
may carry vulnerable low-level audio or video  
signals. Second, because the impedance of  
chassis and cable shielding to ground is always  
greater than zero ohms, ground current flowing  
from power supply capacitors and from EMI  
pickup causes a voltage drop at 60Hz and its  
harmonics. This low level noise becomes part of  
the audio signals.  
lInear FIlterInG technoloGy (lIFt)  
Unfortunately, traditional AC filter conditioners  
have been designed for unrealistic laboratory  
conditions. Prior technologies could actually  
harm audio and video performance more than  
they help, due to the resonant peaking of their  
antiquated, non-linear designs. Under certain  
conditions, these designs can actually add  
more than 10 dB of noise to the incoming AC  
line! Worse still, lost digital data, the need to  
re-boot digital pre-sets, or destroyed digital  
converters are frequently caused by excessive  
voltage spikes and AC noise contaminating the  
equipment ground. Furman’s LiFT takes another  
With a center-tapped isolation transformer, the approach,ensuringoptimalperformancethrough  
AC power feeding a studio can be balanced at linear filtering and no leakage to ground.  
its source. The current-carrying wires then are  
no longer “hot” (120V) and “neutral” (0V), but  
two 60V lines of opposite polarity (referenced  
to ground connected to the center tap), whose  
serIes MultI-staGe protectIon plus  
(sMp+)  
difference is 120V. This type of power, when  
Traditional surge suppression relies on circuits  
run around a room, does not induce hum into  
that “sacrifice” themselves when exposed to  
nearby audio wiring because the two conductors  
multiple transient voltage spikes, requiring  
induce equal and opposite voltages that cancel  
the dismantling of your system and repair of  
your surge suppressor. With Furman’s SMP+,  
however, damaging transient voltages are  
safely absorbed, clamped and dissipated. No  
sacrificed parts, no service calls, no downtime.  
AlsouniquetoFurman’sSMP+isitsunparalleled  
clamping voltage. While other designs offer  
clamping voltages that are well above ꢀ00Vpk,  
each other. Similarly, ground currents are all  
but eliminated by the same common-mode  
cancellation effect. No longer is it necessary to  
adopt cumbersome and expensive star-ground  
systems or use massive bus bars or heavy  
ground rods. Further, with features such as our  
center tap ground lift, ground induced noise may  
be reduced even further.  
Furman’s SMP+ clamps at 188Vpk, 1ꢀꢀ VAC  
Of course Balanced AC Power is only the  
beginning of a system free of AC noise.  
RMS, even when tested with multiple 6000Vpk,  
3000 amp surges! This unprecedented level of  
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IT-20 II - Owner’s Manual  
The power supply cord or plug has been  
frayed or cut  
protection is only available with Furman’s SMP+  
technology.  
Objects have fallen or liquid has spilled into  
the unit  
extreMe VotlaGe shutdown (e.V.s.)  
• The IT-20 II has been exposed to rain or  
other moisture  
When voltage rises to extreme levels because  
of a lost neutral line or an accidental connection  
to 208 or 240 VAC, Furman’s Extreme Voltage  
Shutdown kicks in, automatically powering down  
all equipment quickly and safely to prevent  
damage from occurring. An indicator LED will  
then illuminate, alerting you to the situation until  
the over voltage condition is corrected by turning  
the unit off and then back on.  
• The IT-20 II does not appear to operate  
normally, or exhibits a marked change in  
performance  
• The IT-20 II has been dropped, or the  
enclosure damaged  
The IT-20 II requires that a safety ground be  
present for proper operation. Any attempt to  
operate the IT-20 II without a safety ground  
is considered improper operation and will  
invalidate the warranty.  
dIGItal VoltMeter:  
This LED digital voltmeter is an accurate, self-  
checkingACvoltmeterthatcontinuallymeasures  
the IT-20 II’s input AC voltage.  
power source  
The power source to which the IT-20 II is  
connected should be adequate for use at 7  
amps. Typical household outlets will have a  
current capacity of at least 10 - 15 amps.  
saFety InForMatIon  
and warnInGs  
Please read and observe all of the safety and  
operating instructions before the IT-20 II is  
operated. Retain these instructions for future  
reference.  
warranty  
Furman Sound, LLC., having its principal place  
of business at 1690 Corporate Circle, Petaluma,  
CA 94954 (“Manufacturer”) warrants its IT-20 II  
(the “Product”) as follows:  
Do not disassemble or modify in any way.  
No user-serviceable parts inside  
Keep away from moisture and avoid  
excessive humidity  
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 three years 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  
Do not allow liquids or foreign objects to  
enter the unit. Household lighting equipment  
may not be connected to the IT-20 II because  
its sockets are not designed for use with  
symmetrical power and may present a shock  
hazard. We recommend that only audio,  
video and computer processing equipment  
be connected to the IT-20 II  
The IT-20 II should be serviced by qualified  
service personnel when:  
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IT-20 II - Owner’s Manual  
the claimed defects. If the defects are of such with respect to the Products or any part  
typeandnatureastobecoveredbythiswarranty, thereof, whether based on contract, tort, strict  
Manufacturer shall authorize Purchaser to liability or otherwise. Under no circumstances,  
return the Product to the Furman factory or to whether based on this Limited Warranty or  
an authorized Furman repair location. Warranty otherwise, shall Manufacturer be liable for  
claims should be accompanied by a copy of the incidental, special, or consequential damages.  
original purchase invoice showing the purchase Manufacturer’s employees or representatives’  
date; this is not necessary if the Warranty ORAL OR OTHER WRITTEN STATEMENTS  
Registration was completed either via the mailed DO NOT CONSTITUTE WARRANTIES, shall  
in warranty card or on-line website registration. not be relied upon by Purchaser, and are not  
Shipping charges to the Furman factory or to a part of the contract for sale or this limited  
an authorized repair location must be prepaid warranty. This Limited Warranty states the  
by the Purchaser of the product. Manufacturer entire obligation of Manufacturer with respect to  
shall, at its own expense, furnish a replacement the Product. If any part of this Limited Warranty  
Product or, at Manufacturer’s option, repair the is determined to be void or illegal, the remainder  
defective Product. Return shipping charges back shall remain in full force and effect.  
to Purchaser will be paid by Manufacturer.  
THE FOREGOING IS IN LIEU OF ALL  
OTHER WARRANTIES, EXPRESS OR  
serVIce  
IMPLIED, INCLUDING BUT NOT LIMITED  
Before returning any equipment for repair,  
TO THE IMPLIED WARRANTIES OF  
please be sure that it is adequately packed and  
MERCHANTABILITY AND FITNESS FOR A  
cushioned against damage in shipment, and  
PARTICULAR PURPOSE. Manufacturer does  
that it is insured. We suggest that you save the  
not warrant against damages or defects arising  
original packaging and use it to ship the product  
out of improper or abnormal use of handling of  
for servicing. Also, please enclose a note giving  
the Product; against defects or damages arising  
your name, address, phone number and a  
from improper installation, against defects in  
description of the problem.  
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.  
NOTE: All equipment being returned for repair  
must have a Return Authorization (R/A) number.  
To get an R/A number, please call the Furman  
Service Department at 707.763.1010 extensions  
113 and 133. Please display your R/A number  
prominently on the front of all packages.  
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  
- 7 -  
 
specIFIcatIons  
AC Current Output:  
20 Amps (2400 watts at 60/120V)  
Shutdown Voltage:  
At 1ꢀ5-140 VAC  
Inlets:  
Heavy duty power cord with 20A three-pronged plug  
Outlets:  
12 rear (isolated), 2 front (GFCI) each rated at 20 amps  
Spike Protection Modes:  
Line to neutral, zero ground leakage  
Spike Clamping Voltage:  
188 Vpk @ ꢀ,000 amps, 1ꢀꢀ VAC RMS  
(Tested to UL-1449 6,000 Vpk @ 3,000 amps)  
Response Time:  
1 nanosecond  
Maximum Surge Current:  
6,500 amps  
Differential Noise Attenuation:  
10dB @ 10kHz  
40 dB @ 100 kHz  
100 dB @ 10 MHz  
Common Noise Attenuation:  
Greater than 80 dB @ 20Hz to 20 KHz  
Greater than 40 dB @ 20Khz to MHz  
Linear attenuation curve from 0.05-100 ohms line impedance  
Turns Ratio:  
1:1, windings separated with Faraday Shield  
Transformer Regulation:  
ꢀ% at full load  
Power Consumption:  
12 watts for display and control circuits  
Voltmeter Accuracy:  
± 1V  
Furman Sound, LLC  
1690 Corporate Circle.  
Petaluma, California 94954-6919 USA  
Phone: 707-763-1010  
Dimensions:  
19” W x 5.25” H x 17” D, 80 lbs.  
Fax: 707-763-1310  
051206-C  
 

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