Furman Sound manual IT-1210 Rear View, IT-1220 Rear View, IT-1230 Rear View, Background, Option

IT-1210 Rear View

WARNING - TECHNICAL POWER	60 / 120V 1 AC
DO NOT CONNECT TO LIGHTING EQUIPMENT	GFCI PROTECTED
FOR ELECTRONIC EQUIPMENT USE ONLY
		10A MAX	CAUTION!
			RISK OF ELECTRIC
			SHOCK. DO NOT OPEN.
			REFER SERVICING TO
	Æ	Æ	QUALIFIED SERVICE
120 VAC 60 HZ			PERSONNEL. TO
10 AMPS MAX		LISTED	REDUCE THE RISK OF
		7Z37	FIRE OR ELECTRIC
	PROFESSIONAL
	AUDIO EQUIPMENT		SHOCK DO NOT
			EXPOSE THIS
			EQUIPMENT TO RAIN
		AVIS:	AND MOISTURE.
	RISQUE DE CHOC
	ELECTRIQUE -- NE PAS OUVRIR

IT-1220 Rear View

INPUT VOLTAGE RANGE
80 - 140 VAC 60 HZ
20 AMP MAXIMUM	WARNING - TECHNICAL POWER	CAUTION: THIS UNIT WEIGHS APPROX 65 LBS (30 KILOS)	CAUTION!
			RISK OF ELECTRIC SHOCK. DO NOT OPEN. REFER SERVICING TO
	DO NOT CONNECT TO LIGHTING EQUIPMENT. FOR	USE APPROPRIATE MOUNTING AND SECURING	QUALIFIED SERVICE PERSONNEL. TO REDUCE THE RISK OF FIRE
			OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO
		PROCEDURES WHEN INSTALLING.	RAIN AND MOISTURE.
	ELECTRONIC EQUIPMENT USE ONLY.		LISTED
			7Z37
	CAUTION : THIS UNIT MUST BE PROPERLY GROUNDED	ALL REAR PANEL OUTLETS	PROFESSIONAL
			® AUDIO EQUIPMENT ®
	FOR SAFE OPERATION.	60V / 120V 1PHASE 60 HZ AC	AVIS: RISQUE DE CHOC
		GFCI PROTECTED
			ELECTRIQUE -- NE PAS OUVRIR

IT-1230 Rear View

INPUT	60/120V 10 AC	60 / 120V 10 AC	BREAKER GROUP	WARNING— TECHNICAL POWER
			B
80-140 VAC	GFCI PROTECTED	GFCI PROTECTED		DO NOT CONNECT TO LIGHTING EQUIPMENT.
60 HZ 30 AMPS MAX	30 AMPS MAX	20 AMPS MAX		FOR ELECTRONIC EQUIPMENT USE ONLY.
				20

			20
			BREAKER
	CAUTION!		GROUP	60 / 120V 10 AC
	RISK OF ELECTRIC SHOCK. DO NOT OPEN.		A
	REFER SERVICING TO QUALIFIED SERVICE			GFCI PROTECTED
	PERSONNEL. TO REDUCE THE RISK OF FIRE	AVIS:		20 AMPS MAX
MADE IN USA	OR ELECTRIC SHOCK DO NOT EXPOSE THIS	RISQUE DE CHOC	(INCLUDES FRONT
	EQUIPMENT TO RAIN OR MOISTURE.	ELECTRIQUE—NE PAS OUVRIR	PANEL OUTLETS)

BACKGROUND

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. 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 EMI-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 120 Volt 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 causes 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 signals. Second, because the impedance of chassis and cable shielding to ground is greater than zero, ground current flowing from power supply capacitors and from EMI pickup causes a voltage drop at 60 Hz 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” (120 Volts) and “neutral” (0 Volts), but two 60 Volt lines of opposite polarity (referenced to the safety ground connected to the center tap), whose difference is 120 Volts. 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 out. 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. Most such systems are far more trouble than the less than ideal results they produce, because the ground impedance cannot be reduced to zero. The common- mode rejection of a truly balanced AC supply is simpler, cheaper, and more effective.

Balanced power is recognized by the National Electrical Code (Article 530) for technical power applications. Its use is restricted to electronic equipment only. Balanced power may not be used for lighting equipment, and access must be restricted to use by qualified personnel only.

OPTION

●RRM-2 Rear Rack Mount Ears: Adjustable depth

rear rack ears for the IT-1210, IT-1220 or IT-1230. Adjustment depth is 17” to 18.25” from inside front panel.

Three Year Warranty

The IT-1210, IT-1220 and IT-1230 are protected by a three year limited warranty covering defects in materials and workmanship.

IT-1210/1220/1230 SPECIFICATIONS

Output current: IT-1210: 10 Amps (1200 Watts at 60/120 Volts 1¯ AC, 60 Hz) IT-1220: 20 Amps (2400 Watts at 60/120 Volts 1¯ AC, 60 Hz) IT-1230: 30 Amps (3600 Watts at 60/120 Volts 1¯ AC, 60 Hz)

Voltage Ranges: Normal, 90-130; Marginal (flashes alert), 80-90 or 130-140; Extreme (causes shutdown), below 80 or above 140

Inlets:	IT-1210: Heavy duty power cord with 15 Amp three-prong plug
	IT-1220: Heavy duty power cord with 20 Amp three-prong plug
	IT-1230: One 30 Amp NEMA L14-30P twistlock connector
Outlets:	IT-1210: 12 rear, 2 front, each rated at 10 Amp
	IT-1220: 12 rear, 2 front, each rated at 20 Amp
	IT-1230: Ten 20 Amp outlets and one 30 Amp NEMA L14-30R
	twistlock outlet in rear, plus two 20 Amp outlets on front.
	Front outlets are Ground Fault Interrupter (GFCI) type.
Isolation, Input to Output:		Breakdown Voltage: 1500 Volts minimum.
		Leakage current: 40 mA maximum.
		Capacitance: 300 pf maximum
Turns Ratio:		1:1; windings separated with Faraday shield
Transformer Regulation:		(Full load/no load) 3% at full load
Spike Protection Modes:		Line to neutral, neutral to ground,
		line to ground
Spike Clamping Voltage:		TVSS rating of 400 Volts peak, L-N, N-G, L-G
		(tested to UL-1449)
Spike Response time:		1 nanosecond
Maximum surge current:		6,500 Amps (8 x 20 mS pulse)
Maximum spike energy:		80 Joules per mode, 240 Joules total

Noise attenuation:		Transverse mode: Greater than 60 dB
		Common mode: Greater than 80 dB at 1 to 200 MHz
Mechanical:	Dimensions: IT-1210: 3.5" H x 19" W x 17" D.
		IT-1220/30: 5.25" H x 19" W x 17" D.
	Weight: IT-1210: 40 lbs (18 kg)
	Weight: IT-1220: 60.5 lbs (27.5 kg)
	Weight: IT-1230: 66 lbs (30 kg)
	Construction: Steel chassis, powder coated;
	glass epoxy printed circuit boards
Power Consumption:		8.5 Watts for display and control circuits,
		independent of actual load
Safety information:		IT-1210, IT-1220 UL/CUL Listed

10020-9913 963014-2852 A