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A-3
Read entire installation section before starting
installation.
Safety Precautions
WARNING
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this installation.
• Turn the input power OFF at the
disconnect switch or fuse box
before working on this
equipment.
• Do not touch electrically hot parts.
• Always connect the Square Wave TIG 275 grounding screw
(located on the right rear corner of the base) to a good electrical
earth ground.
• Always connect the Square Wave TIG 275 to a power supply
grounded per the National Electrical Code and any local codes.
SELECT SUITABLE LOCATION
Place the welder where clean cooling air can freely cir-
culate in through the rear louvers and out through the
side louvers. Dirt, dust or any foreign material that can
be drawn into the welder should be kept at a minimum.
Failure to observe these precautions can result in
excessive operating temperatures and nuisance trips.
STACKING
Square Wave TIG 275's cannot be stacked.
LIFTING AND MOVING
The Square Wave TIG 275 should be lifted with a hoist.
(It weighs approximately 330 lbs./150 kg.) An optional
undercarriage is available to easily move the unit. Refer
to the Accessories section of this manual. The Square
Wave TIG 275 is designed to be used with a K932-1
Undercarriage. Complete installation instructions are
included with the K932-1 Undercarriage. When the
undercarriage is properly installed, the Square Wave
TIG 275 lift bale is nonfunctional. Do not attempt to lift
the power source with the undercarriage attached.
The undercarriage is designed for hand moving only;
mechanized towing can lead to personal injury and/or
damage to the Square Wave TIG 275.
TILTING
Each machine must be placed on a secure, level
surface, either directly or on a recommended
undercarriage. The machine may topple over if this
procedure is not followed.
INSTALLATION
ENVIRONMENTAL RATING
The Square Wave TIG 275 power source carries an
IP21 environmental rating. It may be used in normal
industrial and commercial environments. It is rated for
use in damp, dirty rain-sheltered environments.
MACHINE GROUNDING AND HIGH FRE-
QUENCY INTERFERENCE PROTECTION
The frame of the welder must be grounded. A ground
screw marked with the symbol
corner of the base for this purpose. See your local and nation-
al electrical codes for proper grounding methods.
The spark gap oscillator in the high frequency generator, being
similar to a radio transmitter, can be blamed for many radio, TV
and electronic equipment interference problems. These prob-
lems may be the result of radiated interference. Proper ground-
ing methods can reduce or eliminate radiated interference.
The Square Wave TIG 275 has been field tested under rec-
ommended installation conditions and has been found to com-
ply with F .C.C. allowable radiation limits. A certificate (S14929)
is being sent with each welder for customer convenience. If he
desires or is required to obtain certification of compliance with
F .C.C.RF Energy Radiation Limits, this certificate can be used.
It is the customer's responsibility to obtain this certification. This
welder has also been found to comply with NEMA standards
for high frequency stabilized power sources.
Radiated interference can develop in the following four
ways:
1. Direct interference radiated from the welder.
2. Direct interference radiated from the welding leads.
3. Direct interference radiated from feedback into the
power lines.
4. Interference from re-radiation of "pickup" by
ungrounded metallic objects.
Keeping these contributing factors in mind, installing
equipment per the following instructions should mini-
mize problems.
1. Keep the welder power supply lines as short as pos-
sible 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.
SQUARE WAVE TIG 275
A-3
is located at the right rear
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