Input Connections; Input Reconnect Procedure - Lincoln Electric SQUARE WAVE TIG 175 Service Manual

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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.
6. Keep cover and all screws securely in place.
7. Electrical conductors within 50 ft (15.2m) of the
welder should be enclosed in grounded rigid metal-
lic conduit or equivalent shielding, wherever possi-
ble. Flexible 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 unsat-
isfactory welding performance resulting from lost high
frequency power.

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.
208/230 volt models have a NEMA 6-50P plug
attached to the input power cord and a NEMA 6-50R
receptacle is included. Other voltage models have an
input power cord but no plug or receptacle.
Have a qualified electrician provide input power sup-
ply to the receptacle or cord in accordance with all
local and national electrical codes. Use a single phase
line or one phase of a two or three phase line.
Choose an input and grounding wire size according to
local or national codes. Refer to the Technical
Specifications page at the beginning of this section.
Fuse the input circuit with the recommended super lag
1
fuses or delay type circuit breakers. Using fuses or
circuit breakers smaller than recommended may result
1 Also called "inverse time" or "thermal/magnetic" circuit breakers; circuit
breakers which have a delay in tripping action that decreases as the magni-
tude of the current increases.
INSTALLATION
in "nuisance" shut-offs from welder inrush currents
even if not welding at high currents.

INPUT RECONNECT PROCEDURE

On multiple input voltage welders, be sure the
machine is connected per the following instructions
for the voltage being supplied to the welder.
Failure to follow these instructions can cause immedi-
ate failure of components within the welder.
___________________________________________
Multiple voltage models are shipped connected for the
highest voltage. To change this connection refer to the
following instructions.
For Lowest Rated Voltage connection (Refer to
figure A.1):
1. Remove the sheet metal cover.
2. Disconnect lead H3 from the power switch and
insulate with the insulation from the H2 lead.
3. Connect lead H2 to the power switch where H3 was
connected.
4. Tighten connections.
5. Replace sheet metal cover and all screws
For Highest rated voltage connection (Refer to
figure A.1):
The machine is normally shipped connected for 230V,
however verify the following:
1. Remove the sheet metal cover.
2. Disconnect lead H2 from the power switch and
insulate with the insulation from the H3 lead.
3. Connect lead H3 to the line switch where H2 was
connected.
4. Tighten connections.
5. Replace sheet metal cover and all screws.
SQUARE WAVE TIG 175
CAUTION
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the
disconnect switch or fuse box
before working on this
equipment.
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