Maintenance; Maintenance And Service; Inspection And Service; Power Source - ESAB Multimaster 300 Manuel D'instructions

SECTION 5

5.0 MAINTENANCE

5.1 MAINTENANCE AND SERVICE

BE SURE THAT THE BRANCH CIRCUIT OR MAIN DISCON‑
NECT SWITCH AND MULTIMASTER POWER SWITCH ARE
OFF OR ELECTRICAL INPUT FUSES ARE REMOVED BEFORE
ATTEMPT ING ANY INSPECTION OR WORK INSIDE THE
POWER SOURCE. PLACING THE POWER SWITCH ON THE
POWER SOURCE IN THE OFF POSITION DOES NOT REMOVE
ALL POWER FROM INSIDE THE EQUIPMENT.
INSPECTION, TROUBLESHOOTING AND REPAIR OF THIS
EQUIPMENT MAY ORDINARILY BE UN DERTAKEN BY A
COMPETENT INDIVIDUAL HAV ING AT LEAST GENERAL
EXPERIENCE IN THE MAINTENANCE AND REPAIR OF
SEMI‑CONDUC TOR ELECTRONIC EQUIPMENT. MAINTE‑
NANCE OR REPAIR SHOULD NOT BE UNDERTAKEN BY
ANYONE NOT HAVING SUCH QUALIFICATIONS.
Shut OFF shielding gas supply at source.

5.2 INSPECTION AND SERVICE

Keep equipment in clean and safe operating condition free of
oil, grease, and (in electrical part) liquid and metallic particles
which can cause short circuits.
Regularly check cylinder valves, regulators, hoses, and gas
connections for leaks with soap solution or leak test solution
(P/N 998771).
Check for and tighten loose hardware including elec trical
connections. Loose power connections overheat during
welding.
Immediately replace all worn or damaged power cables and
connectors. Check for frayed and cracked insu lation, particu-
larly in areas where conductors enter equipment.
The electrode wire and all metal parts in contact with it are
electrically energized while welding. Inspect these parts peri-
odically for defective insulation and other electrical hazards.
IF UNINSULATED CABLE AND PARTS ARE NOT RE‑
PLACED, AN ARC CAUSED BY A BARE CABLE OR PART
TOUCHING A GROUNDED SURFACE MAY DAMAGE
UNPROTECTED EYES OR START A FIRE. BODY CONTACT
WITH A BARE CABLE, CONNECTOR, OR UNCOVERED
CONDUCTOR CAN CAUSE A FATAL SHOCK.
Keep power cables dry, free of oil and grease, and protect-
ed at all times from damage by hot metal and sparks.
Clean dirt and metal particles from drive roll groove
weekly; replace roll if badly worn.

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 pres-
sure 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
deteriorate with use. The rectifiers are mounted on heat
sinks. A periodic cleaning of dust and dirt from these is
neces sary to insure cooling of the rectifiers. Should any
rectifier 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
overloads.
Do not use filters 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 filtering device is used.
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MAINTENANCE