Lincoln Electric Pro-MIG 140 User Manual download pdf (Page 10)

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).

A-4

INSTALLATION

Pro-MIG 140

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.

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.

GAS CONNECTION

When using the GMAW process, a cylinder of shield-

ing gas, must be obtained. For more information about

selecting gas cylinders for use with the Pro-MIG 140

refer to the ACCESSORIES section.

FIGURE A.4

GUN INSTALLATION

As shipped from the factory, the Pro-MIG 140 is ready

to feed .035" (0.9 mm) Innershield flux-cored wire. If

.023" – .025" (0.6 mm) solid wire is to be used, use

the appropriate contact tip , diffuser and Nozzle.

CAUTION

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Lincoln Electric Pro-MIG 140 User Manual Page 10

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