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PRECISION TIG 275
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INSTALLATION
SAFETY PRECAUTIONS
Read entire Installation Section before installing
the Precision Tig 275.
ELECTRIC SHOCK can kill.
• Only qualified personnel should per-
form this installation.
• Turn the input power OFF
at the disconnect switch or
fuse boxand discharge input capacitors
before working inside the equipment.
• Do not touch electrically hot parts.
• Always connect the Precision Tig grounding screw (behind
the reconnect panel cover located near the back of the left
case side) to a good electrical earth ground.
• Always connect thePrecision Tigto a power supply grounded
in accordance with the National Electrical Code and all local
codes.
SELECT SUITABLE LOCATION
Place the welder where clean cool air can freely circu-
late in through the rear louvers and out through the bot-
tom opening. Dirt, dust or any foreign material that can
be drawn into the machine should be kept at a mini-
mum. Failure to observe these precautions can result
in excessive operating temperatures and nuisance
trips.
GRINDING
Do not direct grinding particles towards the welder. An
abundance of conductive material can cause mainte-
nance problems.
STACKING
The Precision Tig 275 cannot be stacked.
UNDERCARRIAGE LIFTING AND MOVING
When the Precision TIG 275 is purchased as a welding
package, or used with any of the available
Undercarriage optional accessories, proper installation
makes the Precision TIG 275 lift bale nonfunctional.
Do not attempt to lift the power source with an under-
carriage attached. The undercarriage is designed for
hand moving only; mechanized movement can lead to
personal injury and/or damage to the Precision TIG
275.
TILTING
Each machine must be placed on a secure, level sur-
face, either directly or on a recommended undercar-
riage.
The machine may topple over if this precaution is not
followed.
ENVIRONMENTAL RATING
Precision TIG 275 power sources carry an IP21S
Environmental rating. They are rated for use in damp,
dirty rain-sheltered environments.
HIGH FREQUENCY INTERFERENCE
PROTECTION
The frame of the welder must be grounded. A ground
screw marked with the symbol is located on the
input connection panel (Figure A.1) for this purpose.
See your local and national electrical codes for proper
grounding methods.
The spark gap oscillator in the high frequency genera-
tor, being similar to a radio transmitter, can be blamed
for many radio, TV and electronic equipment interfer-
ence problems. These problems may be the result of
radiated interference. Proper grounding methods can
be reduced or eliminate re-radiated interference.
The Precision TIG 275 has been field tested under rec-
ommended installation conditions and has been found
to comply with F.C.C. allowable radiation limits. This
welder has also been found to comply with NEMA stan-
dards for high frequency stabilized power sources.
Radiated interference can develop in the following four
ways:
* Direct interference radiated from the welder.
* Direct interference radiated from the welding leads.
* Direct interference radiated from the feedback into
the power lines.
* Interference from re-radiation of “pickup” by
ungrounded metallic objects.
Keeping these contributing factors in mind, installing
the equipment per the following instructions should
minimize problems.
1. Keep the welder power supply lines as short as pos-
sible and completely enclose them in rigid metallic con-
duit or equivalent shielding for a minimum distance of
50 feet (15.2 m). There must be good electrical contact
between this conduit must be connected to a driven
ground and the entire length must be continuous.
2. Keep the work and electrode leads as short as pos-
sible and as close together as possible. Lengths
should not exceed 25 feet (7.6m). Tape the leads
together when practical.
WARNING
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