Miller Two Fifty Twin-P Manual do Proprietário - Página 13
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6-2.
TRANSFORMER
6-3.
FAN MOTOR
Occasional
blowing
out
of the dust and firt from around the
transformer is recommended. This should be done
periodi
cally
depending
upon
the
location
of
the
unit
and
the
amount
of dust and dirt in
the
atmosphere.
A clean
dry
air
stream
should be used for this
cleaning
operation.
Approximately
once
a
year, it may be necessary
to
lubricate
the
lead
screw,
guides
and
slider.
Apply
a
light
coat
of
Socony
BRB
high
temperature
grease
(or
equivalent), taking
care
to
avoid
getting
grease
on
any electrical
components
of
the
welding
power
source.
All
models
are
equipped
with
an
exhaust
fan
and
rely
on
forced draft for
adequate cooling
for
high duty cycles
and
overloads. The fan
motor
is manufactured with lifetime lubri~
cated
sealed
ball
bearings
and
no
attention
should
be
required.
6-4.
INPUT POWER & WELDING CABLES
These
leads should be
inspected periodically. Frayed
and
broken wires
are common
at
the electrode holder and work
clamp.
The
insulation should be checked
for
cracking
and
bare
spots.
SECTION
7-
TROUBLESHOOTING
INTRODUCTION
The
data collected
here,
discusses
some
of the
common
problems
which may
occur
in this
welding
power
source.
A little
thought
will
probably
solve the
problem
involved
through
the information pro
vided.
The
assumption
of
this data is that
a
proper
welding
condition has
been achieved and has been used until trouble
developed.
In all
cases
of
equipment malfunction,
the
manufacturers
recommendations
should be
strictly
adhered
to
and followed.
If
after
performing
the
following procedures
the trouble is still
not
remedied,
it is recommended that
a
serviceman be called.
It is
recommended
that the Circuit
diagram
be used for reference
during
the
troubleshooting.
Circuit
Diagram
No.
CA-901
973-lA
TROUBLE
PROBABLE CAUSE
REMEDY
High
or
ow
weld
current
Output.
Jumper
links
on
primary
connec-
tion board connected for incorrect
primary voltage.
Position
jumper
links for
primary voltage being
used. See
Figure
3-3.
Erratic weld
current.
Incorrect
polarity
on
dc.
Make proper dc
secondary
connections
as
outlined in section
3.3
Loose
secondary
connections.
Tighten
all
secondary
connections.
Defective
or
damp
electrodes.
Use
new
electrodes of
same
size and type.
Fan operates
at
slow
rpm.
~
Jumper
links
on
primary
connection
board
connected
for
incorrect
primary voltage.
Position
jumper
links for
primary voltage being
used. See
Figure
3-3.
~
Defective fan
motor.
Replace.
Fan does
not
run.
Primary input
line fuses blown.
Replace
Fuses. See Table 3-1 for
proper
fuse size.
Power switch defective.
Replace.
Fan
motor
leads loose.
Tighten
fan
motor
leads.
Defective fan
motor.
Replace.
WORK
ELECT.
NtGATIVE
POSITIVE
Figure
7-1. Circuit
Diagram
OM.313
Page
9