Miller Electric KC237900 Owner's Manual page 9

placed on front of welding power source. Secure in
place with two sheet-metal screws, one on either
side of lifting eye near center of cover. Do not install
the remaining sheet-metal screws (three on each
end) until instructed to do so.
3. Remove blank snap-in from access hole toward
rear of cover installed on welding power source. In-
stall supplied grommet into access hole.
4. Place TIG-Unit on top of welding power source
(controls facing same direction); lifting eye from
welding power source fits through bottom of TIG-
Unit (into U-shaped section at bottom of TIG-Unit's
lifting eye bracket).
5. Insert supplied 3/4 in. (19 mm) diameter bolt (in
component bag under front access door of TIG-
Unit) through U-shaped section at bottom of TIG-
Unit's lifting eye bracket and lifting eye of welding
power source; before securing bolt, align end holes
in bottom of TIG-Unit with end holes in top of weld-
ing power source.
6. Install the six sheet-metal screws (three in each
end) into end holes to secure TIG-Unit (and cover)
to top of welding power source. Secure 3/4 in. (19
mm) diameter bolt.
7. Remove left side panel from welding power source.
8. Locate the two 5 foot (1.5 m) leads (with terminal
lugs attached) inside component bag which are to
be used for obtaining 230 volts ac from the welding
power source.
9. Connect the two leads to the welding power source
as follows:
a. For 60 Hertz Welding Power Sources
Locate fan motor leads 9 and 36. Trace these
leads to the inside of the primary terminal
board. Connect the 230 volts leads to the two
terminals on inside (not jumper link side) of pri-
mary terminal board where fan motor leads 9
and 36 are connected.
b. For 50 Hertz Welding Power Sources
Locate fan motor leads 9 and 20. Trace lead 9 to
the inside of the primary terminal board. Con-
nect one of the 230 volts leads to this terminal
on inside (not jumper link side) of primary termi-
nal board where lead 9 is connected. Trace fan
motor lead 20 to splice (covered with sleeving)
near main transformer. Slide sleeving back to
expose the connection, and splice remaining
230 volts lead to this connection in a proper
manner.
10. Maintain a proper lead dress around fan and wind
tunnel, and route leads through access hole in cover
into TIG-Unit.
11. Connect the two leads to the terminal labeled 230V
on rear terminal strip TE1 (on center mounting pan-
el; see Figure 3-2).
12. Repeat Steps 9 through 17 from method A.
13. Reinstall cover (set aside in Step 1) onto TIG-Unit
and right side panel onto welding power source, and
connect the necessary associated equipment
(shielding gas, water, etc.).
C. Procedure When Mounting To 600 Ampere
Welding Power Sources.
For installation onto 600 ampere welding power
sources, the mounting procedure is different since the
holes in the bottom of the TIG-Unit do not line up with the
top of the welding power source. The rest of the installa-
tion is the same. To mount the TIG-Unit to a 600 ampere
welding power source, proceed as follows:
1. Remove top cover from TIG-Unit, and lay it aside.
2. Place TIG-Unit on top of welding power source
(controls facing same direction); lifting eye from
welding power source fits through bottom of TIG-
Unit (into U-shaped section at bottom of TIG-Unit's
lifting eye bracket). Insert supplied 3/4 in. (19 mm)
diameter bolt (in bag) through U-shaped section at
bottom of TIG-Unit's lifting eye bracket and lifting
eye of welding power source; do not secure bolt at
this time.
3. Using bottom of TIG-Unit as a template, mark loca-
tions for mounting holes and location of lead access
hole (if 230 volts ac from the welding power source
is to be used for operational power).
4. Remove 3/4 in. (19 mm) bolt, and remove TIG-Unit
from top of welding power source.
CAUTION: METAL FILINGS AND/OR TOOL
CONTACT WITH INTERNAL COMPONENTS
can damage unit.
Cover internal components.
Clean unit, and remove internal covering ma-
terial before resuming operation.
5. Drill six 5/32 in. (3.9 mm) holes in marked locations
for mounting TIG-Unit to welding power source.
6. If desired, drill a 1/2 in. (12.7 mm) lead access hole
in marked location.
7. Place TIG-Unit on top of welding power source, in-
sert 3/4 in. (19 mm) bolt, and install the six supplied
sheet-metal screws. Tighten screws and secure
bolt. Install supplied grommet into access opening,
if applicable.
8. Proceed to Section 3-4A Step 6, or Section 3-4B
Step 7 as selected, and follow the remaining in-
structions for the chosen procedure.
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