Lincoln Electric SVM144-B service manual Description of Controls

B-4 OPERATION B-4

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DESCRIPTION OF CONTROLS

Power ON/OFF Switch — Place the lever in the “ON” position to energize the POWER MIG 255. When the power is on, the red LED display lights illuminate.

Voltage Control — This is a continuous control that gives full range adjustment of power source output volt- age. It can be adjusted while welding over its 10 to 28 volt range.

Wire Speed Control — This controls the wire feed speed from 50 to 700 inches per minute (1.2 to

17.8m/min). The wire speed control can be preset on the dial to the setting specified on the Procedure Decal located inside the wire compartment door. Wire speed is not affected when changes are made in the voltage control.

WIRE DRIVE ROLL

The drive rolls installed with the POWER MIG each have two grooves, both for 0.030-0.0035 in. (0.8-0.9 mm) solid steel electrode. Drive roll size is indi- cated by the stencilling on the exposed side of the drive roll. If feeding problems occur, then the drive roll may be reversed or changed. See Procedure for Changing Drive Roll in this section. This information also appears on the Procedure Decal on the door inside the wire compartment. An additional drive roll set is provided for 0.045 in. (1.2 mm) solid steel electrode, packaged standard with each machine.

WIRE SIZE CONVERSION PARTS

The POWER MIG 255 is rated to feed 0.025 through 0.045 in. (0.6 to 1.2 mm) solid or cored electrode sizes.

The drive roll kits and Magnum 250L gun and cable parts are available to feed different sizes and types of electrodes. See Accessories section.

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FIGURE B.1 — OPERATOR CONTROLS

WIRE SPEED VOLTS

ON

LINCOLN	POWER MIG 255
ELECTRIC
OFF
POWER

POWER MIG 255