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5.2.1.3 TRANSFORMER
Occasional blowing out of the dust and dirt from around the
transformer is recommended. This should be done periodi-
cally depending upon the location of the unit and the amount
of dust and dirt in the atmo sphere. The Power Source case
cover should be removed and a clean, dry low pressure air
stream should be used for this cleaning operation.
5.2.1.4 OVER-TEMPERATURE PRO TECTION
The Power Source is protected from high internal tempera-
tures by thermal switches. When the Power Source is oper-
ated under high current applications for long periods, the
thermal switches may reach a high temperature causing it to
de-energize the contactor. These thermal switches will reset
auto matically after the heat sink or transformer windings
have cooled to a safe level. While de-energized, the contactor
can not be oper ated. But, if the gun trigger is depressed, the
unit will still feed wire and the solenoid will operate.
5.2.2 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 improper feeding.
Inspect the rolls regularly and clean them with a ne-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.
SECTION 5 MAINTENANCE
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