Furman Sound IT-20 II Power Supply User Manual
Contents
1. 17 20 il itioner lanced Power Conditio Bala FURMAN BALANCED POWER CONDITIONER vana nma OnorF 120 RES y FEATURES e Ultra low noise balanced isolation transformer provides over 80 dB of common noise reduction form 20Hz 20kHz assuring the lowest noise floor possible for today s sensitive recording equipment e Toroidal transformer assures contained magnetic field allowing any component to operate in close proximity without inducing noise e GFCI protected outlets with Ground Lift switch to eliminate AC hum and ground induced noise e Furman s Linear Filtering Technology LIFT provides well over 40 dB of differential mode noise reduction from 100kHz 1Ghz for unequalled audio clarity e Series Multi Stage Protection Plus SMP for virtually maintenance free protection from surges and spikes No sacrificed parts no service calls no downtime e Automatic Extreme Voltage Shutdown E V S will power down equipment during a prolonged and or extreme over voltage situation e 20 amp capacity with 12 ultra low resistance isolated ground Hubbel AC outlets plus two front panel convenience outlets INTRODUCTION Thank you for your purchase of a Furman IT 20 Il 20 amp Balanced Power Conditioner and congratulations on your choice This specially wound and shielded toroidal isolation transformer is designed specifically to reduce hum pickup by sensitive equipment when ultra low noise is a must DESCRIPTION De2. 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 SPECIFICATIONS AC Current Output 20 Amps 2400 watts at 60 120V Shutdown Voltage At 135 140 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 3 000 amps 133 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 3 at full load Power Consumption 12 watts for display and control circuits Voltmeter Accuracy 11V Dimensions 19 W x 5 25 H x 17 D 80 Ibs FURMAN Furman Sound LLC 1690 Corporate Circle Petaluma California 94954 6919 USA Phone 707 763 1010 Fax 707 763 1310 Web www FurmanSound com 051206
3. 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 Il to be securely attached in both the front and back Order model RRM 2 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 GROUND FAULT INTERRUPTER GFCI The GFCI on the IT 20 Il 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 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 Ils 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 GROUND Lirt SWITCH G
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5. d 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 Inthe end itis bestto experiment with this switch Whichever position yields the least noise or clearest audio video recording or reproduction is the position that should be utilized BALANCED AC POWER 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 North America unfortunately is not balanced The distribution standards currently in use were derived from practices established over a century ago when electric power use was limited to lighting and motors long before any AC noise sensitive applications existed The emphasis then was on convenience from the power utilities standpoint and safety but not noise cancellation The result was a three wire distribution scheme 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 a
6. is anticipated A dedicated nothing else connected 20 amp circuit is the minimum acceptable to comply with NEC requirements Consult a qualified electrician if in doubt The IT 20 Il 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 The maximum benefit is derived from balanced power when it powers ALL equipment in an installation Therefore try to position the IT 20 Il 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 amps at 120 volts delete high level or mechanical 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
7. ltiple 6000Vpk 3000 amp surges This unprecedented level of protection is only available with Furman s SMP technology EXTREME VOTLAGE SHUTDOWN E V S 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 DIGITAL VOLTMETER This LED digital voltmeter is an accurate self checking AC voltmeter that continually measures the IT 20 II s input AC voltage SAFETY INFORMATION AND WARNINGS Please read and observe all of the safety and operating instructions before the IT 20 Il is operated Retain these instructions for future reference e Do not disassemble or modify in any way No user serviceable parts inside Keep away from moisture and avoid excessive humidity 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 Il should be serviced by qualified service personnel when e The power sup
8. ny 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 With a center tapped isolation transformer the AC power feeding a studio can be balanced at its source The current carrying wires then are no longer hot 120V and neutral OV but two 60V lines of opposite polarity referenced to ground connected to the center tap whose difference is 120V This type of power when run around a room does not induce hum into nearby audio wiring because the two conductors induce equal and opposite voltages that cancel 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 Of course Balanced AC Power is only the beginning of a system free of AC noise Asymmetrical noise or what is called differential mode is responsible for well over half the noise present in today s AC lines For this reason we employ our exclusive Linear Filtering Technol
9. ogy LIFT This assures that your audio video or computer signals are as pure and uncorrupted as possible 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 approach ensuring optimal performance through linear filtering and no leakage to ground Series MuLtI STAGE PROTECTION PLus SMP Traditional surge suppression relies on circuits that sacrifice themselves when exposed to multiple transient voltage spikes requiring 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 Also unique to Furman s SMP is its unparalleled clamping voltage While other designs offer clamping voltages that are well above 300Vpk Furman s SMP clamps at 188Vpk 133 VAC RMS even when tested with mu
10. ply cord or plug has been frayed or cut e Objects have fallen or liquid has spilled into the unit e The IT 20 Il has been exposed to rain or other moisture e The IT 20 ll does not appear to operate normally or exhibits a marked change in performance e The IT 20 Il has been dropped or the enclosure damaged The IT 20 Il 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 Power Source The power source to which the IT 20 Il is connected should be adequate for use at 7 amps Typical household outlets will have a current capacity of at least 10 15 amps 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 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 the claimed defects If the defect
11. round 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 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 many AC noise contaminants may be present on the AC ground wire For these reasons Furman s IT 20 Il contains a Ground Lift Switch 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 Ils 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 Il This is far safer than any conventional 120 VAC outlet and it has numerous noise reducing advantages However ground wiring in any studio broadcast or club environment can be complex Because all 14 outlets of the IT 20 Il 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 Il Use of multiple IT 20 Ils may be necessary in extreme cases Also for studio an
12. s 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 warran
13. signed for the most critical ultra low noise installations the IT 20 Il 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 ll 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 Filtering Technology LIFT and laboratory grade digital voltmeter and you will be assured that AC noise and surges are a thing of the past INSTALLATION The power source to which the IT 20 Il is connected must be adequate for use at 20 amps We recommend a 30 amp circuit wired with 10 gauge wiring if continuous operation near 20 amps
14. ty 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 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
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