Gas Connection - Lincoln Electric Pro-MIG 140 Manual Del Operador

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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2
1
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.
INSTALLATION
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.
3
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.
Pro-MIG 140
CAUTION
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