OPERATION | ||
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TO START THE WELDER
Turn the Power Switch switch to ON. This lights the red LED display lights. With the desired voltage and wire speed selected, operate the gun trigger for welder out- put and to energize the wire feed motor.
FEEDING WIRE ELECTRODE
WARNING
When triggering, the electrode and drive mecha- nism are electrically “hot” relative to work and ground and remain “hot” several seconds after the gun trigger is released.
NOTE: Check that drive rolls, guide plates, and gun parts are proper for the wire size and type being used. Refer to Table C.1 in Accessories section.
1.Turn the
2.While securely holding the electrode, cut off the bent end and straighten the first six inches. (If the electrode is not properly straightened, it may not feed properly through the wire drive system.)
3.Release the pressure on the idle roll by swinging the adjustable pressure arm down toward the back of the machine. Lift the cast idle roll assem- bly and allow it to sit in an upright position. Leave the outer wire guide plate installed. Manually feed the wire through the incoming guide bushing and through the guide plates (over the drive roll groove). Push a sufficient wire length to assure that the wire has fed into the gun and cable assembly without restriction. Reposition the adjustable pressure arm to its original position to apply pressure to the wire.
4.Press gun trigger to feed the electrode wire through the gun.
IDLE ROLL PRESSURE SETTING
WARNING
ELECTRIC SHOCK can kill.
•Turn the input power OFF at the welding power source before installation or changing drive rolls and/or guides.
•Do not touch electrically live parts.
•When inching with the gun trigger, electrode and drive mechanism are "hot" to work and ground and could remain energized several seconds after the gun trigger is released.
•Only qualified personnel should perform mainte- nance work.
The pressure arm controls the amount of force the drive rolls exert on the wire. Proper adjustment of both pressure arm gives the best welding performance. For best results, set both pressure arms to the same value.
Set the pressure arm as follows (See Figure B.3):
Aluminum wires | between 1 and 3 |
Cored wires | between 3 and 4 |
Steel, Stainless wires | between 4 and 6 |
FIGURE B.3
CORED WIRES |
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| SOLID WIRES | ||
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| 1 |
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| 2 |
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| ALUMINUM | |||||||
OUTERSHIELD |
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METALSHIELD |
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INNERSHIELD |
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| 4 |
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| STEEL | ||
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| STAINLESS |
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WIRE DRIVE CONFIGURATION
(See Figure B.4)
Changing the Gun Receiver Bushing
ELECTRIC SHOCK can kill.
•Turn the input power OFF at the welding power source before installation or changing drive rolls and/or guides.
•Do not touch electrically live parts.
••When inching with the gun trigger, electrode and drive mechanism are "hot" to work and ground and could remain energized several seconds after the gun trigger is released.
••Only qualified personnel should perform mainte- nance work.
Tools required:
• 1/4" hex key wrench.
Note: Some gun bushings do not require the use of the thumb screw.
1.Turn power off at the welding power source.
2.Remove the welding wire from the wire drive.
3.Remove the thumb screw from the wire drive.
4.Remove the welding gun from the wire drive.
POWER MIG 255C