ESAB Multimaster 300 Instruction Manual page 64

SECTION 5
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 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.
Schematics and Wiring Diagrams on 279.4mm x 431.8mm
(11" x 17") paper are included inside the back cover of this manual.
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 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.
NOTE:
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MAINTENANCE