Idle Roll Pressure Setting

B-8

OPERATION

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The idle roll pressure is set at the factory. Two-roll feeders are set with the pressure adjustment knob backed out two turns from full pressure, and four-roll feeders are set backed out three turns. This is an approximate setting. For small wire sizes and aluminum wire the optimum idle roll pressure varies with type of wire, surface condition, lubrication, and hardness. The optimum idle roll setting can be determined as follows:

Two-roll wire feeders:

1.Press the end of the gun against a solid object that is electrically isolated from the welder output and press the trigger for several seconds.

2.If the wire “birdnests”, jams, or breaks at the drive roll, the idle roll pressure is set too high. Back the pressure adjustment knob, Figure B.4, out 1/2 turn. Run new wire through the gun and repeat step 1.

3.If the only result is drive roll slippage, loosen the gun cable clamping screw on the conductor block and pull the gun cable forward about six inches. There should be a slight waviness in the exposed wire. If there is no waviness, the pressure is too low. Increase the pressure setting 1/4 turn. Lock the gun cable in place and repeat steps 1 and 2.

Four-roll wire feeders:

1.Release the incoming idle roll and perform the pressure setting procedure for two roll feeders to set outgoing idle roll pressure.

2.After outgoing pressure is set, determine how many turns away from full pressure the setting is.

3.Set both idle roll tensions to this setting. Engage both idle rolls before welding. For most applications, best wire feeding will occur when both idle roll pressures are set the same.

Lincoln Electric SVM 106-A service manual Idle Roll Pressure Setting, Two-roll wire feeders

Models: SVM 106-A

OPERATION

IDLE ROLL PRESSURE SETTING

Two-roll wire feeders:

Four-roll wire feeders:

FIGURE B.4 – IDLE ROLL PRESSURE SETTING.

ADJUSTMENT

KNOB

LN-7 GMA WIRE FEEDER