ESAB MIGMASTER 250 Bedienerhandbuch PDF herunterladen (Seite 39)

SECTION 5 MAINTENANCE

5.1 MAINTENANCE

Shut OFF shielding gas supply at source.

To aid in checking and servicing, use Schematic, Figure 5.1.

5.2 INSPECTION AND SERVICE

Keep Equipment in clean and safe operating condition free of oil, grease, and

(in electrical parts) liquid and metallic particles which can cause short-circuits.

Regularly check cylinder valves, regulators, hoses, and gas connections for

leaks with soap solution.

Check for and tighten loose hardware including electrical connections. Loose

power connections overheat during welding.

Immediately replace all worn or damaged power cables and connectors. Check

for frayed and cracked insulation, particularly 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 periodically for defective insulation and other

electrical hazards.

Keep power cables dry, free of oil and grease, and protected 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 RECTIFIER

It is recommended that the rectifier be cleaned occasionally by blowing it out

with 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 silicon diode rectifiers are specially designed for

welding machine use and will not age or deteriorate in use. The four diodes are

mounted on heat sinks. A periodic cleaning of dust and dirt from these is

necessary to insure cooling of the rectifiers. Access is by removal of top cover

and side panels. Should any diode accidentally be damaged and need

replacement, it can be quickly removed from the heat sink. The replacement

diode should be of the same type as the one removed, and should be locked

securely to the sink, preferably with a torque wrench set for maximum of 25 ft.

lbs. and a minimum of 20 ft. lbs. Excessive torque will distort the mechanical

structure and may break the hermetic seal, whereas too little torque will result

in improper electrical connections.

NOTE: Thermal conductive compound (Wakefield Engineering #120 Ther-

mal Compound or equivalent) must be reapplied to heat sink-diode

mating surface whenever a diode is replaced.

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. Lubricate the fan motor

with a few drops of SAE-20 non-detergent oil every three months.

Be sure the branch circuit or main dis-

connect switch is off or electrical input

circuit fuses are removed before at-

tempting any inspection or work on the

inside of the welding machine. Placing

the power switch on the welding ma-

chine in the OFF position does not re-

move all power from inside of the equip-

ment.

If uninsulated cable and parts are not

replaced, an arc caused by a bared cable

or part touching a grounded surface

may damage unprotected eyes or start

a fire. Body contact with a bared cable,

connector, or uncovered conductor can

shock, possible fatally.

Inspection, troubleshooting and repair

of this equipment may ordinarily be

undertaken by a competent individual

having at least general experience in

the maintenance and repair of semi-

conductor electronic equipment. Main-

tenance or repair should not be under-

taken by anyone not having such qualifica-

tions.

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