Lincoln Electric R3R-500, R3R-300 Operation, General Description, Recommended Processes

B-3 B-3

OPERATION

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GENERAL DESCRIPTION

The Idealarc R3R is an SCR controlled constant cur- rent DC output power source for welding and cutting. The R3R-300 uses a single range potentiometer con- trol. The R3R-400 and R3R-500 have separate low and high range controls. The welder’s unique combi- nation of 3 phase transformer, SCR/Diode bridge rec- tifier, arc control choke, and solid state control system deliver outstanding arc characteristics. For stick weld- ing, an Arc Force Control enables the Idealarc-R3R to create a soft welding arc for critical applications or a forceful driving arc for heavy duty applications.

RECOMMENDED PROCESSES

The Idealarc R3R is recomended for stick and DC TIG welding and air/carbon arc gouging.

DESIGN FEATURES AND ADVANTAGES

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

•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 reduces chance of acci- dental 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.

WELDING CAPABILITY

The Idealarc R3R has the following duty cycle ratings. If the duty cycle is exceeded, a thermal protector 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.

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60% Duty Cycle*	Amps	Volts
R3R-300	300	32
R3R-400	400	36
R3R-500	500	40

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

IDEALARC R3R