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SECTION 5 MAINTENANCE
5.2.1.3 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 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 temperatures by thermal switches. When the Power Source is operated
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.
5.2.1 POWER SOURCE
5.2.1.1 RECTIFIERS AND TRANSISTORS
It is recommended that the internal components be cleaned occasionally by blowing them out with low pressure compressed
air. This cleaning operation is necessary so that maximum cooling will be accomplished by the air stream. This should be
done periodically, depending upon the location of the unit and the amount of dust and dirt in the atmosphere.
The hermetically sealed diodes and transistors are specially designed for welding machine use and will not age or deterio-
rate with use. The rectiers are mounted on heat sinks. A periodic cleaning of dust and dirt from these is neces sary to insure
cooling of the rectiers. Should any rectier need replacement, it can be quickly re moved from the heat sink.
5.2.1.2 FAN MOTOR
All models are equipped with an exhaust fan and rely on forced draft for adequate cooling for high duty cycles and over-
loads.
CAUTION
Do not use lters on this unit as they would restrict the volume of intake air. Output
ratings on this unit are based on an unobstructed supply of cooling air drawn over
its internal components. Warranty is void if any type of ltering device is used.
NOTE:
Schematics and Wiring Diagrams on 11” x 17”
paper are included
inside the back cover of this manual.
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