Lincoln Electric CENTURY AC 120 Operator's Manual page 16

C-2
PROBLEMS
(SYMPTOMS)
Power source stops.
Power switch on but no weld cur-
rent.
Unstable arc.
Porous weld.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
Thermal Overload Protection acti-
vated due to overload.
Bad connection between ground-
clamp and workpiece.
Impurities on base metal.
Dirty base metal.
CENTURY® AC 120
CAUSE
The Thermal Protection automati-
cally resets when the transformer
has cooled (approximately 15 min-
utes)
Clean or wire brush the
work surface.
Clean with wire brush.
Clean with wire brush.
CAUTION
RECOMMENDED
COURSE OF ACTION
C-2