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SECTION
4-
MAINTENANCE & TROUBLESHOOTING
a
WARNING
ELECTRIC- SHOCK
can
kill.
Do
not touch
live electrical parts.
Turn
OFF
welding
power
source,
and disconnect
input
power before
inspecting, maintaining,
or
servicing.
HOT PARTS
can cause severe
burns.
Allow
cooling
period
before
maintaining
or
servicing.
MOVING PARTS
can cause
Injury.
Keep
away from
moving
parts.
Keep
away from
pinch
pOints
such
as
drive rolls.
Table
4.1.
Maintenance Schedule
Time
Maintenance
Before
each
use.
Tighten
all connections. Check
gun
and
clean nozzle.
After
each
spool
of wire.
Blow
out
gun
liner.
Clean and
check wire drive
parts; replace
as
necessary.
Every
3 months.
Tape
or
replace
cracked cables: clean and
tighten
connections.
Replace
unreadable labels.
Every
6 months.
Blow
out
or vacuum
inside of unit.
4-1.
Thermal Overload Protection
If
rectifier SR2
overheats,
thermostat TP1 opens
stopping
all weld
output.
If this
condition
occurs, the
pilot
light
next
to
the
gun
polarity
jumper
link terminals
goes
out and
the fan
motor
runs.
Allow unit
to
cool about 15 minutes before
trying
to
weld.
4-2.
Overload Protection
A.
Short Circuit Shutdown
READ
SAFETY BLOCKS
at start
of
SectIon
4
before
proceeding.
If contact tube is
shorted and sticks
to
workpiece,
the unit shuts
down,
but
fan
runs.
To
resume
operation,
release gun
trigger,
turn
OFF
unit,
and
remove
contact tube
from
workpiece.
Check
contact tube
and
replace
if
damaged.
Turn ON
unit
to
continue
operation.
Maintenance and
troubleshooting
to
be
performed
only by qualified
persons.
swarnA 2
1O/9~
B.
Motor Fuse Fl
Figure
4-1.
Fuse Fl Location
OM..154 500
Page
6
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