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MAINTENANCE
D-2 D-2
POWER WAVE 355/405
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Have qualified personnel do the maintenance
work. Always use the greatest care when
working near moving parts.
Do not put your hands near the cooling blower
fan. If a problem cannot be corrected by
following the instructions, take the machine to
the nearest Lincoln Field Service Shop.
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WARNING
VISUAL INSPECTION
Clean interior of machine with a low pressure air
stream. Make a thorough inspection of all compo-
nents. Look for signs of overheating, broken leads or
other obvious problems. Many problems can be
uncovered with a good visual inspection.
ROUTINE MAINTENANCE
1. Every 6 months or so the machine should be
cleaned with a low pressure airstream. Keeping
the machine clean will result in cooler operation
and higher reliability. Be sure to clean these
areas:
• All printed circuit boards
• Power switch
• Main transformer
• Input rectifier
• Auxiliary Transformer
• Reconnect Switch Area
• Fan (Blow air through the rear louvers)
2. Examine the sheet metal case for dents or breakage.
Repair the case as required. Keep the case in good
condition to insure that high voltage parts are protected
and correct spacings are maintained. All external sheet
metal screws must be in place to insure case strength
and electrical ground continuity.
PERIODIC MAINTENANCE
Calibration of the POWER WAVE 355/405 is critical to
its operation. Generally speaking the calibration will
not need adjustment. However, neglected or improper-
ly calibrated machines may not yield satisfactory weld
performance. To ensure optimal performance, the cali-
bration of output Voltage and Current should be
checked yearly.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground
• Always wear dry insulating gloves.
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EXPLODING PARTS can cause
injury.
•
Failed parts can explode or cause other
parts to explode when power is applied.
•
Always wear a face shield and long
sleeves when servicing.
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See additional warning information
throughout this Manual.
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CAPACITOR DISCHARGE PROCEDURE
1. Obtain a power resistor (25 ohms, 25 watts).
2. Hold resistor body with electrically insulated glove.
DO
NOT TOUCH TERMINALS. Connect the resis-
tor terminals across the two studs in the position
shown. Hold in each position for 1 second.
Repeat for all four capacitors.
3. Use a DC voltmeter to check that voltage is not
present across the terminals on all four capaci-
tors.
CAPACITOR
TERMINALS
RESISTOR