Installation, Input connections, Ground connection – Lincoln Electric SQUARE WAVE TIG 255 SVM100-A User Manual
Page 10: Input supply connections
A-3
INSTALLATION
SQUARE WAVE TIG 255
4. Keep the torch in good repair and all connections
tight to reduce high frequency leakage.
5. The work terminal must be connected to a ground
within ten feet of the welder, using one of the
following methods:
a) A metal underground water pipe in direct
contact 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
grounding 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.
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
metallic conduit or equivalent shielding. Flexible
metallic conduit is generally not suitable.
8. When the welder is enclosed in a metal building,
several good earth driven electrical grounds (as in
5 (b) above) around the periphery of the building
are recommended.
Failure to observe these recommended installation
procedures can cause radio or TV interference
problems and result in unsatisfactory welding
performance resulting from lost high frequency
power.
FIGURE A.1 — REAR PANEL
1. RATING PLATE
4. 220V RECEPTACLE & BREAKER
2. INPUT ENTRY HOLE
(50/60 HZ MACHINE ONLY)
3. RECONNECT PANEL
5. 115V RECEPTACLE & BREAKER
GROUND CONNECTION
The frame of the welder must be grounded. A ground
terminal marked with the symbol is located at
the bottom of the input box for this purpose. See your
local and national electrical codes for proper
grounding methods.
INPUT SUPPLY CONNECTIONS
Have a qualified electrician connect single phase input
power leads to L1 and L2 of the input panel in accor-
dance with all local codes and national electrical
codes. Refer to the connection diagram located on the
inside of the cover of the Reconnect Panel.
INPUT 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. Refer to Figure A.1.
Welder supply line entry provision is in the case rear
panel with a removable cover over the input
connection panel area. Entry is through a 1.7 in
(43mm) diameter hole in the case back. See Figure
A.1.
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1
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