Table of Contents
Advertisement
SECTION 5
-
TROUBLESHOOTING
1IIUh1~1II~1
Hazardous
voltages
are
present
on
the
internal
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.
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.
1f it becomes
necessary
to
replace
any
fuse
in the
welding
power source,
ensure
that
a
fuse of the proper size is used.
I
U
U
I
TROUBLE
PROBABLE CAUSE
REMEDY
No weld output.
POWER circuit breaker
open.
Manually
reset
POWER circuit breaker,
Fuse
Fl open.
Replace
fuse F1.
Thermostat(s)
open.
Allow
a
cooling period
before
attempting
to
resume
opera
tion.
Control
relay
CR1 defective.
Check
relay
CR1 and
replace
if necessary.
Printed
circuit board
not
secure
in
receptacle.
Ensure
that the
printed
circuit board is
secure
in
receptacle.
Printed
circuit board defective.
Check
printed
circuit board and
replace
if necessary.
Defective component
in main
rec-
tifier SRi.
Check
main
rectifier SRi components and
replace
necessary
parts.
Limited
output
and
low
open-
Circuit
voltage,
DC
open-circuit voltage
selector
on
wrong taps.
See Section 3-4 for proper open -circuit
voltage
selection.
Open
line fuse
on one
phase.
Check
input
line
fuse(s)
and
replace
as
necessary.
Printed
Circuit board
not
secure
in
receptacle.
Ensure
that the
printed
circuit board is
secure
in
receptacle.
Printed
circuit board defective.
Check
printed
Circuit board and
replace
if necessary.
Defective component
in
main
rec-
tifier SR
1.
Check
main
rectifier SRi components
and
replace
necessary
parts.
Erratic
weld
output.
Incorrect
welding
cable size.
Use proper size and type of cable
(see
Section
3-3,
Table
3-2).
Loose
welding
cable connections.
Ensure all
connections
are
clean and
tight.
No
115 volts
ac
at
115 VOLTS
AC
duplex
receptacle.
Fuse F2
open.
Replace
fuse F2.
OM-233
Page
9
Advertisement
Table of Contents
