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amount
of
dust and dirt
in
the
atmosphere.
The
welding
power
source
outer
enclosure should be removed and
a
clean
dry
air
stream
should be used for this
cleaning operation.
6-3.
RECTIFIER
It is recommended that the rectifier be cleaned
occasionally
by
blowing
it
Out
with
compressed
air. This
cleaning
opera
tion
is necessary
so
that maximum
cooling
will be
accom
plished
by
the air
stream.
This should be done
periodically.
depending
upon
the location of
the unit and the amount
of
dust and dirt
in the
atmosphere.
It will be
necessary
to
re
move
the
outer
enclosure for this
cleaning operation.
6-4.
CONTROL CIRCUIT PROTECTION
The
entire control
circuit
of the
welding
power
source
is
protected by
a
600
volts,
10
ampere,
cartridge
type fuse
(Fl).
This fuse
is
located behind the
right
rear
side door.
Should this fuse open the
welding
power
source
would
com
pletely
shut down.
The 15 volts control circuit is
protected by
fuse F3 located
on
the
center
baffle.
If the fuse
opens
control of Output is avail
able but
complete
minimum
cannot
be obtained.
I
I
IMPORTANT
If it should become necessary
to
replace
this fuse
or
any other
fuse
in the
welding
power
source,
ensure
that the proper size fuse is used
as
a
replacement.
I
I
SECTION
7
-
TROUBLESHOOTING
Hazardous
voltages
are
present
on
the
internal
cir
cuitry
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
Qf
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.
It
is
assumed
that
proper
installation
has
been
made,
according
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
procedures,
the
nearest
Factory
Authorized Service Station should be contacted. In
all
cases
of
equipment
malfunction,
the
manufacturers
recommendations should be
strictly
followed.
TROUBLE
PROBABLE CAUSE
REMEDY
Limited
output and low open-cir-
cuit
voltage,
Operation
on
single-phase. Open
line fuse
on one
phase.
Check
incoming
three-phase
power
for
correct
voltage
Re.
place
fuse if
open.
Input voltage jumper
links
con-
nected
to
wrong terminals,
Connect
jumper
links for
input
voltage being
used. See the
input voltage
label
on
the
primary
connection board.
Fan
runs
slow.
Input voltage
jumper
links
on
pri-
mary Connection board connected
for incorrect
voltage.
Connect
jumper
links for
input
voltage being
used. See
Fig-
ure
3-3 and
the
input voltage
label
on
the
primary
con-
nection board.
Fan does
not
run.
Weld
output
available,
Fan
motor
defective.
Check fan
motor
leads
for
possible
short.
Re-insulate fan
motor
leads,
if shorted.
Check
fan
motor
windings
for
continuity.
If open,
replace
the
fan
motor.
Rotate
the
fan
to
check for freedom of rotation. If hard
to
rotate,
replace
the
motor.
Fan
does
not
run
and
no
weld
output.
Fuse
(Fl)
open.
~Replace
fuse
(Fl?,
,f
open.
Line fuses open.
Replace
line
fuses,
if
defective,
Erratic weld
current.
Incorrect
welding
cable size,
Use proper
size &
type
of cable. See item
3.3.
Loose
welding
cable connections.
Tighten
all
welding
connections.
Incorrect drive gear for wire size
on
the
feeder.
See wire feeder instruction manual
troubleshooting guide.
Fan
runs
but
no
weld output
or
115 VAC
output.
Fuse
(F2)
open.
Replace
fuse
(F2),
if open.
Fan
runs,
115 VAC
available,
but
no
weld output.
Circuit breaker
(CB 1) tripped.
Reset circuit breaker
(CB 1).
if
tripped.
Centrifugal
switch
(FMS)
open.
Replace centrifugal
(FMS)
switch.
Fan
runs,
115 VAC available,
but
low weld output.
Circuit breaker
(CB2)
open.
Manually
reset
circuit breaker
(CB2).
1f it becomes
necessary
to
replace
any fuse in the
welding
power source,
ensure
that
a
fuse of the proper size is used,
OM.254
Page
13
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