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A-6
INSTALLATION
GX 271 Chopper
A-6
ELECTRICAL CONNECTIONS
See Figure B.1 in the OPERATION section of this
manual for location of the 120 and 240 volt recepta-
cles, weld output terminals, circuit breakers and
ground stud.
MACHINE GROUNDING
Because the GX-271 creates its own power from its
engine driven generator, and if the machine is not
connected to premises wiring (home, shop, etc.), you
do not need to connect the machine frame to an earth
ground. However, for best protection against electri-
cal shock, connect a heavy gauge wire (#8 AWG or
larger) from the ground stud located on the bottom of
the output panel (See Figure B.1) to a suitable earth
ground such as a metal pipe driven into the ground.
Do not ground the machine to a pipe that carries
explosive or combustible material.
------------------------------------------------------------------------
When the GX-271 is mounted on a truck or a trailer,
the machine generator ground stud MUST be securely
connected to the metal frame of the vehicle. See
Figure B.1. The ground stud is marked with the
ground symbol.
If the GX-271 is connected to premises wiring such as
a home or shop, it must be properly connected to the
system earth ground.
WELDING CABLE CONNECTIONS
CABLE SIZE AND LENGTH
Be sure to use welding cables that are large enough.
The correct size and length becomes especially
important when you are welding at a distance from the
welder.
Table A.1 lists recommended cable sizes and lengths
for rated current and duty cycle. Length refers to the
distance from the welder to the work and back to the
welder. Cable diameters are increased for long cable
lengths to reduce voltage drops.
Lincoln Electric offers a welding accessory kit with the
properly specified welding cables. See the
ACCESSORIES section of this manual for more infor-
mation.
WARNING
Table A.1
CABLE INSTALLATION
Install the welding cables to your GX-271 as follows.
See Figure B.1 for location of parts.
1. The engine must be OFF to install welding cables.
2. Remove the flanged nuts from the output terminals.
3. Connect the electrode holder and work cables to
the weld “+” and “-” output terminals. The terminals
are identified on the case front. The polarity require-
ment for the welding process being used deter-
mines which terminal the electrode cable is
attached to.
4. Tighten the flanged nuts securely.
5. Be certain that the metal piece you are welding (the
“work”) is properly connected to the work clamp and
cable.
6. Check and tighten the connections periodically.
• Loose connections will cause the output terminals to
overheat. The terminals may eventually melt.
• Do not cross the welding cables at the output termi-
nal connection. Keep the cables isolated and sepa-
rate from one another.
------------------------------------------------------------------------
TOTAL COMBINED LENGTH OF
ELECTRODE AND WORK CABLES
Cable Length
0-50 Ft. (0-15 meters)
50-100 Ft. (15-39 meters)
100-150 Ft. (30-46 meters)
150-200 Ft. (46-61 meters)
200-250 Ft. (61-76 meters)
Cable Size for
300 Amps
100% Duty Cycle
1/0 AWG
1/0 AWG
2/0 AWG
2/0 AWG
3/0 AWG
CAUTION