Lincoln Electric IM640 SAE400 Weld'n Air - Manual (Page 28)

E-4 TROUBLESHOOTING E-4
SAE400 & SAE400 WELD ’ N AIR
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE CAUSE
RECOMMENDED
COURSE OF ACTION
Welding current too great or too
small compared to indication on the
dial.
Welder has output and no control
“Current Control” shaft and handle
may have turned slightly in the insu-
lated bushing of the current control
brushholder, caused by turning han-
dle too hard against one of the
stops.
Exciter output low causing low out-
put compared to dial indication.
“Current Control” set to minimum
and welder output so great that
engine stalls when arc is struck.
Local/Remote switch is in wrong
position.
With current control against the min-
imum stop, set pointer to within 1/8”
of the last scale division.
Check for shorts in exciter armature
with growler.
Check to see that series field is
properly connected and not shorted.
Place switch in “LOCAL” position to
control output at the welder. Place
switch in “REMOTE” position to con-
trol output remotely.