A-2
INSTALLATION
INVERTEC® V311-T AC/DC TIG
A-2
MACHINE GROUNDING AND HIGH FRE-
QUENCY INTERFERENCE PROTECTION
The Capacitor Discharge Circuit used in the high fre-
quency generator, may cause many radio, TV and
electronic equipment interference problems. These
problems may be the result of radiated interference.
Proper grounding methods can reduce or eliminate
radiated interference.
The Invertec® V311-T AC/DC TIG has been field test-
ed under recommended installation conditions. It com-
plies with FCC allowable limits for radiation.
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
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).
3.
Be sure the torch and work cable rubber cover-
ings are free of cuts and cracks that allow high
frequency leakage. Cables with high natural rub-
ber content, such as Lincoln Stable-Arc
®
better
resist high frequency leakage than neoprene and
other synthetic rubber insulated cables.
4. Keep the torch in good repair and all connections
tight to reduce high frequency leakage.
Read entire installation section before starting
installation.
Safety Precautions
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SELECT SUITABLE LOCATION
The Invertec® V311-T AC/DC TIG will operate in
harsh environments. Even so, it is important that sim-
ple preventative measures are followed in order to
assure long life and reliable operation.
• The machine must be located where there is free cir-
culation of clean air such that air movement in the
back and out the front will not be restricted.
• Dirt and dust that can be drawn into the machine
should be kept to a minimum. Failure to observe
these precautions can result in excessive operating
temperatures and nuisance shutdown.
STACKING
The Invertec® V311-T AC/DC TIG can not be
stacked.
TILTING
Place the machine directly on a secure, level surface.
The machine may topple over if this procedure is not
followed.
ENVIRONMENTAL AREA
Keep the machine dry. Do not place it on wet ground
or in puddles.
ELECTRIC SHOCK can kill.
•
Only qualified personnel should per-
form this installation.
• Turn the input power OFF and
unplug the machine from the recep-
tacle before working on this equip-
ment. Allow machine to sit for 5 min-
utes minimum to allow the power
capacitors to discharge before
working inside this equipment.
•
Insulate yourself from the work and ground.
•
Always wear dry insulating gloves.
• Always connect the Invertec® V311-T AC/DC TIG
to a power supply grounded according to the
National Electrical Code and local codes.
WARNING
