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6.2.1.2 FAN MOTOR
All models are equipped with an exhaust fan and rely
on forced draft for adequate cooling for high duty cycles
and overloads. Lubricate the fan motor with a few drops
of SAE-20 non-detergent oil every three months.
6.2.1.3 TRANSFORMER
Occasional blowing out of the dust and dirt from around
the transformer is recommended. This should be done
periodically depending upon the location of the unit and
the amount of dust and dirt in the atmosphere. The
Power Source case cover should be removed and a
clean, dry low pressure air stream should be used for
this cleaning operation.
6.2.1.4 24 VOLT WIRE FEEDER AND CONTROL
CIRCUITS
If it should become necessary to replace the 15
amp wire feeder circuit breaker or any other circuit
breaker/fuse in the welding machine, ensure that
the proper size is used as a replacement.
The 24-volt circuit is protected by a 15 amp circuit
breaker installed on the wire compartment shelf, ac-
cessible from the wire feeder compartment. Failure of
this circuit breaker will shut off the contactor, shielding
gas, and wire feeder.
6.2.1.5 OVER-TEMPERATURE PRO-TECTION
The Power Source is protected from high internal tem-
peratures by thermal switches (TS1 and 2). When the
Power Source is operated under high current applica-
tions for long periods, the thermal switches may reach
an abnormally high temperature causing it to
deenergize the contactor. These thermal switches will
reset automatically after the transformer windings have
cooled to a safe level. While deenergized, neither the
contactor, shielding gas nor wire feeder can be oper-
ated.
6.2.2 WIRE FEEDER
As soft wire is fed, the drive rolls may pick up metal
from the wire surface. Accumulation on the rolls may
score the wire with resulting unwanted friction and im-
proper feeding.
Inspect the rolls regularly and clean them with a fine-
wire power brush. Avoid roughening, or removing the
hardness of groove surfaces in grooved rolls. Any
roughening may score the wire, just as the accumula-
tion being removed may do.
