Gun Installation; Connecting Gun Cable To The Sp-100; Gas Connection - Lincoln Electric SP-100 Service Manual

3. Route the cable under and around the back of the
Wire Feed Gearbox (6).
4. For GMAW Only: Refer to Figure A.2. As deliv-
ered, the SP-100 is wired for positive polarity. This
is the appropriate configuration for the Gas Metal
Arc Welding (GMAW) process. To complete instal-
lation, 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. To wire
for negative polarity, 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).
FIGURE A.4
4
2
1

GUN INSTALLATION

As shipped from the factory, the SP-100 gun is ready
to feed 0.023 - 0.025" (0,6 mm) wire. If 0.030" (0,8
mm) wire is to be used install the 0.030" (0.8 mm)
contact tip. Refer to the MAINTENANCE section for
contact tip installation details.

CONNECTING GUN CABLE TO THE SP-100

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.
INSTALLATION
3. Insert the connector on the gun conductor cable
into the Gun Cable Access Hole (2) in the SP-100
case front. Make sure the connector is all the way
in the metal connector block to obtain proper gas
flow. Rotate the connector 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 connector
bushings located above 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 SP-100, the switch must be
a normally open, momentary switch. The terminals
of the switch must be insulated from the welding
circuit. Malfunction of the SP-100 may result if this
switch shorts to the SP-100 welding output circuit
or is common to any electrical circuit other than
the SP-100 trigger circuit.

GAS CONNECTION

Refer to Figure A.5
When using the GMAW process, a cylinder of carbon
dioxide (CO
gas, flow regulator, and an inlet gas hose must be
obtained. For more information about selecting gas
cylinders for use with the SP-100, refer to the ACCES-
SORIES section.
CAUTION
) or argon-carbon dioxide mixed shielding
2
WARNING
CYLINDER may explode if dam-
aged. Keep cylinder upright and
chained to support
• Keep cylinder away from areas
where it may be damaged.
• Never lift welder with cylinder
attached.
• Never allow welding electrode to
touch cylinder.
• Keep cylinder away from welding
or other live electrical circuits.
A-4
SP-100