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ly. Figure
4-3 enables
the
operator
to
determine the safe
output
of the
welding
power
source
at
various
duty
cycles.
IMPORTANT
______________
Exceeding
the indicated
duty cycle
will
cause
overheating
and
thereby damage
to
the
welding
power
source.
SECTION 5- MAINTENANCE
CAUTION
_________
Depressing
the
POWER
CONTROL
STOP button does
not
remove
power from all of the
welding
power
source
internal
circuitry. Completely
ter
minate all electrical power
to
the
welding
power
source
by
employing
machinery
lockout
procedures
before
attempting
any
inspection
or
work
on
the inside of the
unit, If the
welding
power
source
is connected
to
a
disconnect
switch,
padlock
the switch in
an
open
posi
tion. If connected
to
a
fuse
box,
remove
the fuses and
padlock
the
cover
in the
closed
position.
If the unit is
connected
to
a
circuit
breaker,
or
other
disconnecting
device without
locking
facilities,
attach
a
red
tag
to
the
device
to
warn
others that the
circuit is
being
worked
on.
Ih~II]:~f~k~kg
Periodically inspect
the labels
on
this
unit for
legibility.
All labels
must
be maintained in
a
clearly
readable
state
and
replaced
when
necessary.
See the Parts List for
part
number of
labels.
5-1. FAN
MOTOR
-
All models
are
equipped
with
an
exhaust fan and
rely
on
forced draft for
adequate
cool
ing.
The fan
motor
is manufactured with lifetime-
lubricated sealed ball
bearings
and
no
attention should
be
required.
5-2. INTERNAL
CLEANING
-
Occasional
blowing
Out
or
vacuuming
of the
dust and dirt from around the
internal
components
is recommended. This should be
done
periodically
depending
upon
the location of the
unit and the
amount
of dust and dirt in the
atmosphere.
The
welding
power
source
outer
enclosure should be
removed and
a
clean,
dry
air
stream
or vacuum
suction
should be used for this
cleaning operation.
5-3. CONTROL CIRCUIT PROTECTION
-
The
en
tire control circuit of the
welding
power
source
is
pro
tected
by
a
cartridge
type
fuse
Fl. This fuse is located
under the
top
cover
beside
contactor
W. Should this
fuse
open,
the
welding
power
source
would
completely
shut down.
SECTION 6
-
TROUBLESHOOTING
It is assumed
that
proper
installation has been
made,
ac
cording
to
Section 3 of this
manual,
and that the
welding
power
source
has been
functioning properly
until this trouble
developed.
Use this
chart in
conjunction
with the circuit
diagram
while
performing troubleshooting procedures.
If the
trouble is
not
remedied after
performing
these
pro
cedures,
the
nearest
Factory
Authorized Service Sta
tion should be contacted. In all
cases
of
equipment
malfunction,
the
manufacturers
recommendations
should be
strictly
followed.
CAUTION
___________
Hazardous
voltages
are
present
on
the
in
ternal
circuitry
of the
welding
power
source as
long
as
power
is connected
to
the unit.
Disconnect
power
before
attempting
any
inspection
or
work
on
the inside
of the unit.
Troubleshooting
of internal
circuitry
should
be
performed by qualified personnel only.
The
following
chart
is
designed
to
diagnose
and
provide
remedies for
some
of the troubles that
may
develop
in
this
welding
power
source.
TROUBLE
PROBABLE CAUSE
REMEDY
No
output.
Thermostat TP1
open.
Allow unit
a
cooling period.
Replace
TP1.
Circuit breaker CB
open.
Reset CB.
Replace
CB.
Fuse Fl is
blown.
*
Replace
Fl.
01f it becomes necessary
to
replace
any
fuse in the
welding
power source,
ensure
that
a
fuse of the
proper
size,
type,
and
rating
is used.
OM-267
Page
18
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