Miller PORTA-MIG Manuel du propriétaire - Page 29

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Miller PORTA-MIG Manuel du propriétaire
Open
feeder
case
according
to
Section
7-1
before
beginning
this
procedure.
Close
and
secure case
when
procedure
is
done.
LockoutItagging 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 disconnect
ing
device.
MOVING PARTS
can cause
serious
injury.
Keep
away from
moving
parts.
HOT SURFACES
can cause severe
burns.
Allow
cooling
period
before
servicing.
The drive rolls and wire
guides
must be
aligned
for wire
to
feed
properly. Alignment
is
factory
set
and should
not
require adjustment.
If
alignment
is necessary,
proceed
as
follows:
Rotate the drive gear
securing
bolt and
move
the drive
roll in
or
out to
the desired
position.
The drive roll
on
the
pressure gear will locate itself
on
the wire when the
gear
cover
is
replaced
and the gears mesh
together.
The
mounting
holes
in
the wire drive
housing provide
sufficient
clearance
to
adjust
the wire
guides
up
or
down
in relation to the drive
rolls. This
adjustment
has been
factory
set,
but if
readjustment
is necessary,
proceed
as
follows:
1.
Loosen
mounting
bolts,
and weld cable terminal
nut
and bolt.
2.
Slide
the wire drive
housing upward
or
downward
until the wire feeds
straight through
the
guides
while seated in the drive roll
groove.
3.
Tighten mounting
bolts,
and weld cable terminal
bolt and
nut.
DISASSEMBLY OF
THE
MOTOR
FIELD
MAG
NETS
can
result in
personal injury
and
equipment damage.
Limit drive
motor
repairs
to
brush
replace
ment.
The field
magnets
are
very
strong.
If
disassem
bly
is
attempted,
injury
to
fingers
and hands may
result from the
rotor
being
drawn back into the
motor.
The field
magnets
are
matched sets, and
operation
may
be affected if the
magnets
are
tampered
with.
Warranty
is void if the
motor
is
tampered
with.
Brush Holder
Cap
Screw
(2)
7
Ret. SC.072
511.0
1.
Remove the
two
brush holder cap
screws.
2.
Remove brushes.
3.
Examine
brushes,
and
replace
if
they
are
chipped
or
broken
or
if less than
1/4
in.
(6.4 mm)
of brush
material remains.
4.
Install
brushes,
and reinstall brush holder cap
screws.
7-5.
OVERLOAD PROTECTION
(Figure 5-1)
7-4.
BRUSH INSPECTION
AND
REPLACEMENT
(Figure
7-1)
a
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut
down wire feeder and
welding
power
source,
and disconnect
input
power
employ
ing lockout/tagging
procedures
before
in
specting, maintaining,
or
servicing.
Open
feeder
case
according
to
Section
7-1
before
beginning
this
procedure.
Close
and
secure case
when
procedure
is
done.
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 disconnect
ing
device.
a
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut
down wire feeder and
welding
power
source,
and disconnect
input
power
employ
ing lockout/tagging procedures
before
in
specting, maintaining,
or
servicing.
Open
feeder
case
according
to
Section
7-1
before
beginning
this
procedure.
Close
and
secure case
when
procedure
is
done.
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 disconnect
ing
device.
INCORRECT FUSE
can
damage
unit.
Use
only replacement
fuse of
same
size, type,
and
rating (see
Parts
List).
Wire Drive
(2)
Figure
7-1.
Motor Brush
Replacement
OM-1220
Page
23