GUN Installation, GAS Connection | Lincoln Electric Pro-MIG 140

A-4	INSTALLATION	A-4

Work Cable Installation

Refer to Figure A.2.

1.Open the wire feed section door on the right side of the Pro-MIG 140.

2.Pass the end of the work cable that has the termi- nal lug with the smaller hole through the Work Cable Access Hole (1) in the case front.

3.Route the cable under and around the back of the Wire Feed Gearbox (6).

4.For GMAW Only: Refer to Figure A.2. This is the appropriate configuration for the GMAW (MIG) process. To complete installation, use the provided wing nut to connect the work cable’s terminal lug to the negative (–) output terminal (5) located above the Wire Feed Gearbox (6). Make sure that both wing nuts are tight.

5.For Innershield Only: Refer to Figure A.4. As delivered, the machine is connected for negative electrode polarity. To wire for negative polarity (required for the Innershield process), connect the short cable attached to the connector block (1) to the negative (–) output terminal (2) and the work cable (3) to the positive (+) terminal (4).

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FIGURE A.4

Connecting Gun Cable to the Pro-MIG 140

1.Refer to Figure A.2. Unplug the machine or turn power switch to the OFF “O” position.

2.Pass the insulated terminals of the gun trigger con- trol leads, one at a time, through the Gun Cable and Control Lead Access Slot (2) in the case front. The leads are to be routed under the Wire Feed Gearbox (6) and through the Cable Hanger (7) on the inner panel.

3.Insert the connector on the gun conductor cable through the Gun Cable Access Hole (2) in the Pro- MIG 140 case front. Make sure the connector is all the way into the brass connector block. Unscrew the thumbscrew on the connector block a few turns if gun connector will not insert fully. Rotate the con- nector so control leads are on the underside and tighten the Thumbscrew (8) in the connector block.

4.Connect the gun trigger control lead terminals to the two insulated 1/4" (6.4 mm) tab terminal con- nector bushings located below the “Gun Trigger Connection” decal in the wire feed section (4). Either lead can go to either connector. Form the leads so that they are as close as possible to the inside panel.

CAUTION

If the gun trigger switch being used is other than that supplied with the Pro-MIG 140, the switch must be a normally open, momentary switch. The terminals of the switch must be insulated from the welding circuit. Malfunction of the Pro-MIG 140 may result if this switch shorts to the Pro-MIG 140 welding output circuit or is common to any electri- cal circuit other than the Pro-MIG 140 trigger cir- cuit.