Miller PORTA-MIG Manual do Proprietário - Página 30
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A.
Circuit Breaker CB1
(Figure
5-1)
a
WARNING:
Read and follow
safety
informa
tion
at
beginning
of entire Section
7-5 be
fore
proceeding.
Circuit breaker CBl
protects
the drive motor from dam
age
due
to
overload. If CB
1
should open, the wire feeder
would
immediately
stop
operating.
Should
a
motor overload
occur
and
trip
CB1,
proceed
as
follows:
1.
Check for
jammed
wire
or
clogged
gun
liner,
and
correct
the
problem.
If
motor
overload
happens
often,
repair
or
replace
the
motor
or
liner.
2.
Check for
binding
drive
gear
or
misaligned
drive
rolls,
and correct
problem.
3.
Manually
reset
CB1;
it
may be necessary
to
allow
a
cooling period
before the breaker
can
be
reset.
4.
Resume
operation.
B.
Fuse Fl
(Figure
5-1)
a
WARNING: Read
and follow
safety
informa
tion
at
beginning
of entire
Section
7-5
be
fore
proceeding.
Fuse Fl
protects
the wire feeder from
damage
due toan
internal short
or
excessive overload. If fuse Fl should
open,
the wire feeder would
completely
shut down~
To
replace
the
fuse,
proceed
as
follows:
1.
Depress
and
rotate
fuse holder
cover
counter
clockwise.
2.
Pull
out
fuse
with
cover
when fuse
holder
cover
is
free.
3.
Insert
new
fuse into fuse holder
cover.
4.
Install
new
fuse with fuse holder
cover
back into
unit.
5.
Depress
and
rotate
fuse holder
cover
clockwise
until
cover
is
secure.
7-6.
CIRCUIT BOARD PRECAUTIONS
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
mak
ing
internal connections.
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
CAUTION:
ELECTROSTATIC DISCHARGE
(ESD)
can
damage
circuit boards.
Put
on
properly grounded
wrist
strap
BE
FORE
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.
TROUBLESHOOTiNG
(Table
7-2)
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
mak
ing
internal connections.
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
oft
and
red-tagging
circuit breaker
or
other
disconnect
ing
device.
a
CAUTION: DISASSEMBLY OF
THE
MOTOR
FIELD MAGNETS
can
result in
personal
in
jury
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.
It is
assumed that the unit
was
properly
installed accord
ing
to
Section
4
of this
manual,
the
operator
is familiar
with the function of
controls,
the wire feeder
was
working
properly,
and that the trouble is
not
related
to
the
welding
process.
The
following
table is
designed
to
diagnose
and
provide
remedies for
some
of the troubles that may
develop
in
this wire feeder. Use this table in
conjunction
with the cir
cuit
diagram
while
performing troubleshooting
proce
dures.
If
the trouble is
not
remedied after
performing
these
procedures,
contact the nearest
Factory
Autho
rized Service Station.
In
all
cases
of
equipment
malfunc
tion,
strictly
follow the manufacturers
procedures
and
instructions.
a
OM-1220
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