Lincoln Electric IM790 SP-175 Plus - Manual (Page 11)

A-4 A-4 INSTALLATION
4. For GMAW Only: Refer to Figure A.2. As deliv-
ered, the SP-175 Plus is wired for positive polarity.
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
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 SP-
175 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.
If the gun trigger switch being used is other than
that supplied with the SP-175 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-175 Plus will
result if this switch shorts to the SP-175 Plus
welding output circuit or is common to any electri-
cal circuit other than the SP-175 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-175 Plus,
refer to the ACCESSORIES section.
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.
GUN INSTALLATION
As shipped from the factory, the SP-175 Plus gun liner
is ready to feed 0.023 - 0.035
” (0.6 - 0.9 mm) wire. If
0.025 ” (0.6 mm) or 0.030 ” (0.8 mm) wire is to be used
install the 0.025 ” (0.6 mm) or 0.30 ” (0.8 mm) contact
tip. Refer to the MAINTENANCE section for contact tip
installation details. If .035
’ Flux-Cored wire is to be
used, change the contact tip and nozzle to the appro-
priate types and orient the drive roll to the appropriate
groove size.
Note: If .045
” (1.2mm) / innershield Flux-Cored wire is
to be used, the appropriate Innershield Kit is required.
Connecting Gun Cable to the SP-175 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.
CAUTION
WARNING
1
2
3 4
SP-175 PLUS