Gas Connection; Gun Installation - Lincoln Electric IM788 Operator's Manual

A-4
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-135 PLUS is wired for positive polari-
ty. This is the appropriate configuration for the Gas
Metal Arc Welding (GMAW) 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. 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-135 PLUS gun is
ready to feed .023 - .025" (0,6 mm) wire. If .030-.035"
(0.8-0.9 mm) wire is to be used, change the contact tip
to the appropriate size. Refer to the MAINTENANCE
section for contact tip installation details.
NOTE: If .035" Innershield Flux-cored wire is to be
used, see the Accessories section for the Innershield
Welding Kit.
Connecting Gun Cable to the SP-135
PLUS
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
through the Gun Cable Access Hole (2) in the SP-
135 PLUS 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-135 PLUS, 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-135 PLUS
will result if this switch shorts to the SP-135 PLUS
welding output circuit or is common to any electri-
cal circuit other than the SP-135 PLUS trigger
circuit.

GAS CONNECTION

Refer to Figure A.5
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 SP-135 PLUS,
refer to the ACCESSORIES section.
SP-135 PLUS
CAUTION
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