Miller Electric KC237900 - Manual (Page 27)

OM-530 Page 23
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.
1. Remove top cover and right side panel, and locate
spark gaps according to Parts List Views.
2. Loosen screws A on both sides.
3. Place feeler gauge of proper thickness between
points C.
4. Apply slight pressure against points B so feeler
gauge is held firmly in gap.
5. Tighten screws A.
6. Close and secure front panel access door.
C C
B B A
A
S-0043
Figure 6-3. Spark Gap Adjustment
6-4. OVERLOAD PROTECTION
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.
INCORRECT FUSE can damage unit.
•
Use only replacement fuse of same size,
type, and rating (see Parts List).
The control circuit in the TIG-Unit is protected by a 15
ampere circuit breaker CB1 located under the front ac-
cess door to the left of the duplex receptacle. Should this
circuit breaker trip, it would be necessary to manually re-
set it by depressing the button. The symptoms of a
tripped breaker are no output at the duplex receptacle,
no flow of gas and coolant, and no high-frequency out-
put.
A. Fuse F1
Fuse F1 is a 3 ampere, glass fuse located on the center
mounting panel below terminal strip 1T. If this fuse
should open, there would be no remote control of the
contactor.
B. Fuse F2
When the unit is connected to 230 volts in the welding
power source, the entire TIG-Unit is protected by a 600
volts, 10 ampere, cartridge type fuse F2. This fuse is lo-
cated on the center mounting panel below terminal strip
1T. Should this fuse open, the TIG-Unit will completely
shut down.
6-5. CIRCUIT BOARD HANDLING PRECAUTIONS
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.
CAUTION: ELECTROSTATIC DISCHARGE
(ESD) can damage circuit boards.
•
Put on properly grounded wrist strap
BEFORE handling circuit boards.
•
Transport circuit boards in proper static-
shielding carriers or packages.
•
Perform work only at a static-safe work area.
INCORRECT INSTALLATION or misaligned
plugs can damage circuit board.
•
Be sure that plugs are properly installed and
aligned.
EXCESSIVE PRESSURE can break circuit
board.
•
Use only minimal pressure and gentle move-
ment when disconnecting or connecting board
plugs and removing or installing board.
6-6. TROUBLESHOOTING (Table 6-3)
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.