Miller 900 860 Snelstarthandleiding - Pagina 10
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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
remove
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
~F1).
This
fuse
is
located
behind
the
rear
primary
access
panel,
immediately
to
the
upper
right.
Should
this fuse open
the
welding
power
source
would
completely
shut down.
I
I
IMPORTANT
U
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.
.
SECTION
7
-
TROUBLESHOOTING
The data collected
here,
discusses
some
of the
common
problems
which may
occur
in this
welding
power
source.
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 recommenc~d
that the
circuit
diagram
be used for reference
during troubleshooting.
TROUBLE
PROBABLE CAUSE
REMEDY
Li mite d
o
u
t
pu
t
and
low
open.circuit voltage,
Operation
on
single phase. Open
line fuse
on one
phase.
Check
incoming
three-phase
power
for
correct
voltage.
Replace
fuse if open.
Input
voltage
jumper
links
connected
to
wrong terminals,
Connect
jumper links for
input
voltage being
used. See the
input
voltage
Label
on
the
rear
panel
hinged
door.
Fan
runs
slow.
~
Input voltage jumper
links
on
primary
con
nection
board
connected
for
incorrect
voltage.
Connect
jumper
links for
input
voltage being
used.
See the
input
voltage
Label
on
the
rear
panel
hinged
door.
Fan
does
not
run.
Weld
output
available.
Fan
motor
defective.
Check fan
motor
leads for
possible
short.
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.
Line fuses
open.
Replace
defective fuses.
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.
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