1.
Keep the welder power supply lines as short as
possible and enclose as much of them as possible
in rigid metallic conduit or equivalent shielding for
a distance of 50 feet (15.2m). There should be
good electrical contact between this conduit and
the welder case ground. Both ends of the conduit
should be connected to a driven ground and the
entire length should be continuous.
2.
Keep the work and electrode leads as short as
possible and as close together as possible.
Lengths should not exceed 25 ft (7.6m). Tape the
leads together when practical.
3.
Be sure the torch and work cable rubber coverings
are free of cuts and cracks that allow high frequen-
cy leakage. Cables with high natural rubber con-
tent, such as Lincoln Stable-Arc® better resist high
frequency leakage than neoprene and other syn-
thetic rubber insulated cables.
4.
Keep the torch in good repair and all connections
tight to reduce high frequency leakage.
5.
The work piece must be connected to an earth
ground close to the work clamp, using one of the
following methods:
a) A metal underground water pipe in direct con-
tact with the earth for ten feet or more.
b) A 3/4” (19mm) galvanized pipe or a 5/8”
(16mm) solid galvanized iron, steel or copper
rod driven at least eight feet into the ground.
The ground should be securely made and the ground-
ing cable should be as short as possible using cable of
the same size as the work cable, or larger. Grounding
to the building frame electrical conduit or a long pipe
system can result in re-radiation, effectively making
these members radiating antennas. (This is not recom-
mended).
6.
Keep all access panels and covers securely in
place.
7.
All electrical conductors within 50 ft (15.2m) of the
welder should be enclosed in grounded rigid metal-
lic conduit or equivalent shielding. Flexible helical-
ly-wrapped metallic conduit is generally not suit-
able.
8.
When the welder is enclosed in a metal building,
the metal building should be connected to several
good earth driven electrical grounds (as in 5 (b)
above) around the periphery of the building.
Failure to observe these recommended installation
procedures can cause radio or TV and electronic
equipment interference problems and result in unsatis-
factory welding performance resulting from lost high
frequency power.
INPUT SUPPLY CONNECTIONS
Be sure the voltage, phase, and frequency of the input
power is as specified on the rating plate, located on the
rear of the machine.
See Figure A.1 for the location of the rating plate, the
entry hole, and the reconnect panel.
FIGURE A.1
1. Input Entry
4. 220V Receptacle & Breaker
2. Rating Plate
(50/60 HZ. Machines Only.)
3. 115V Receptacle & Breaker
5. Gas Input Fitting
(60 HZ. Machines only)
Remove the right case side to reveal the reconnect
panel. Welder supply line entry provision is in the case
rear panel. Entry is through a 1.4 inch (36 mm) diam-
eter hole in the case back.
All connections should be made in accordance with all
local codes and national electrical codes. Installation
by a qualified electrician is recommended.
1. Connect the terminal marked (at the base of the
welder below the reconnect panel) to an earth
ground.
2. Connect the imput leads to terminals marked L1 (U)
and L2 (V) on the reconnect panel. Use a single
phase line or one phase of a two or three phase line.
INSTALLATION
A-4
A-4
SQUARE WAVE TIG 275
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