Miller Electric KC237900 - Manual (Page 24)

OM-530 Page 20
b. Select and obtain proper tungsten electrode
(see Table 6-2).
c. Prepare tungsten electrode according to Sec-
tion 6-2, and insert into torch).
13. Turn on shielding gas and coolant, if applicable.
14. Rotate the GAS/COOLANT POSTFLOW time con-
trol to the desired coolant-gas postflow time (see
Section 4-4).
15. Depress the POWER switch on the welding power
source to the ON position.
16. Connect the 115 volts ac plug from the TIG-Unit to
its power supply, if applicable.
17. Begin welding.
5-2. SHIELDED METAL ARC WELDING WITH TIG-
UNIT
WARNING: Read and follow safety informa-
tion at beginning of entire Section 5 before
proceeding.
1. Make all necessary connections as instructed in
Section 4.
IMPORTANT: For Shielded Metal Arc Welding applica-
tions, place the AMPERAGE switch in the PANEL posi-
tion and the OUTPUT (CONTACTOR) switch in the ON
position. At this point the AMPERAGE ADJUSTMENT
control and AMPERAGE switch on the TIG-Unit are not
functional.
2. Place the GAS/COOLANT switch in the OFF posi-
tion (see Section 4-3).
3. Place the HIGH FREQUENCY switch in the OFF
position (see Section 4-6).
4. Place the POLARITY switch in the desired position
(see Section 4-2).
5. Wear dry insulating gloves and clothing, and wear
welding helmet with proper filter lens according to
ANSI Z49.1.
6. Prepare for welding as follows:
a. Connect work clamp to clean, bare metal at
workpiece.
b. Select and obtain proper electrode, and insert
into electrode holder.
7. Depress the POWER switch on the welding power
source to the ON position.
8. Connect the 115 volts ac plug from the TIG-Unit to
its power supply if applicable.
9. Begin welding.
5-3. SHUTTING DOWN
1. Stop welding.
2. Allow the unit to idle for three minute with no load
applied.
3. Depress the POWER switch on the welding power
source to the OFF position.
4. Disconnect the 115 volts ac plug from its power sup-
ply, if applicable.
5. Turn off the shielding gas and coolant supply if appli-
cable.
WARNING: HIGH CONCENTRATION OF
SHIELDING GAS can harm health or kill.
•
Shut off gas supply when not in use.
SECTION 6 – MAINTENANCE & TROUBLESHOOTING
6-1. ROUTINE MAINTENANCE (Table 6-1)
IMPORTANT: Every six months inspect the labels on
this unit for legibility. All precautionary labels must be
maintained in a clearly readable state and replaced
when necessary. See Parts List for part number of
precautionary labels.
WARNING: ELECTRIC SHOCK can kill.
•
Do not touch live electrical parts.
•
Shut down welding power source, and dis-
connect input power employing lockout/tagging
procedures before inspecting, maintaining, or
servicing.
Lockout/tagging procedures consist of pad-
locking line disconnect switch in open position,
removing fuses from fuse box, or shutting off
and red-tagging circuit breaker or other discon-
necting device.
MOVING PARTS can cause serious injury.
•
Keep away from moving parts.
HOT SURFACES can cause severe burns.
•
Allow cooling period before servicing.
Maintenance to be performed only by qualified
persons.