Lincoln Electric SVM 122-A service manual Operation, General Description

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B-3 B-3

OPERATION

GENERAL DESCRIPTION

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The Idealarc DC-400 is an SCR controlled three-phase input, DC output power source for welding and cut- ting. It uses a single range potentiometer control. The welder’s unique combination of transformer, three- phase semiconverter rectifier, capacitor bank, arc con- trol choke, and solid state control system deliver out- standing arc characteristics in the constant voltage mode. For stick welding, an Arc Force Control enables the Idealarc-400 to perform much like the R3R-500.

•DC Ammeter

•DC Voltmeter

•Voltmeter “+” Electrode or “-” Electrode Switch

DESIGN FEATURES AND ADVANTAGES

•Input line voltage compensation keeps output con- stant for fluctuations of ± 10%.

•SCR control extends life of mechanical contactors.

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RECOMMENDED PROCESSES

The Idealarc DC-400 is recomended for all open arc processes including Innershield® and all solid wire and gas procedures within its capacity of 60 to 500 amps. It also can perform stick and TIG welding and air/car- bon arc gouging up to 5/16” (8 mm) diameter. A mode switch on the front control panel selects CV (FCAW, GMAW), CV Submerged Arc, or CC (stick/TIG).

The Idealarc DC-400 can be connected to wire feed- ing equipment, including:

•Automatic wire feeders NA-3, NA-5, and NA-5R. (Requires the DC-400 Diode Kit option to use the cold start and cold electrode sensing features of these feeders.)

•Semi-automatic wire feeders LN-7, LN-7 GMA, LN- 8, LN-9, LN-9 GMA, LN23P, LN-25, LN-742.

•Tractors LT-56, LT-7.

•Hinged front control panel provides easy access to printed circuit boards and other control circuitry.

•Fully enclosed fan motor with permanently lubri- cated, sealed ball bearings needs no maintenance.

•Fully recessed control panel protects controls and minimizes accidental contact.

•Recessed output terminals and hinged terminal cover reduce chance of accidental contact.

•Low profile case permits installation under a work- bench.

•Removable rear access panel provides easy access to input contactor and input lead connections.

•Removable case sides provide easy access for ser- vice or inspection, even when machines are stacked.

•Dripproof enclosure design permits outdoor operation.

•Double-dipped transformer, SCR bridge, and choke resist corrosion.

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OPERATIONAL FEATURES AND CONTROLS

The following operational controls are standard on the Idealarc DC-400:

•Power Source Pilot Light

•ON/OFF Power Toggle Switch

•Output Control Potentiometer

•Output Control Switch (with Local or Remote posi- tions)

•Output Terminals On or Remote Switch

•Arc Force Selector (for CC stick or TIG processes only)

•Auxiliary Power Connections for Wire Feeder and Other Equipment (115V and 42V)

•Mode Switch

WELDING CAPABILITY

The Idealarc DC-400 has the following duty cycle ratings. If the duty cycle is exceeded, a thermal pro- tector will shut off the machine output until it cools to normal operating temperature. The amber thermal protection indicator light will turn on until the machine cools.

Duty Cycle*	Amps	Volts
100%	400	36
60%	450	38
50%	500	40

*Based on a 10 minute time period. For example, a 60% duty cycle means 6 minutes on and 4 minutes off.

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• Arc Control	LIMITATIONS
• Thermal Protection Indicator Light	The Idealarc DC-400 has no provisions for paralleling.
	IDEALARC DC-400
	LINCOLN ®
	ELECTRIC