Maintenance - Lincoln Electric IDEALARC DC-1500 Service Manual

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SAFETY PRECAUTIONS
WARNING
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 Operator's Manual
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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: See Figure D.1.
• All printed circuit boards
• Power switch
• Main transformer and reactor
• Input contactor
• Auxiliary Transformer
• Reconnect Switch Area
• Fans (Blow air through the rear louvers)
• Rectifiers
2. Examine the sheet metal case for dents or break-
age. Repair the case as required. Keep the case
in good condition to insure that high voltage parts
are protected and correct spacings are main-
tained. All external sheet metal screws must be in
place to insure case strength and electrical ground
continuity.
GENERAL MAINTENANCE
1. The fan motors have sealed bearings which
require no service.
2. In extremely dusty locations, dirt may clog the air
channels causing the welder to run hot. Blow out
the welder with low pressure air at regular inter-
vals. Also blow dirt out of the NL Option box.

MAINTENANCE

OVERLOAD PROTECTION
The DC-1500 has built-in protective thermostats. If the
rectifier or transformer reaches the maximum safe
operating temprature because of frequent overload or
high room temprature because of frequent overload or
high room temprature plus overload, the conductor
drops out stopping the welder. The thermostat auto-
matically reset when the temprature reaches a safe
operating level. Press the "On" button to start the
welder.
The power rectifiers are also protected by a special
solid state circuit. With the occurence of a short circuit
or excessively high overloads, the input contactor
opens. When the overload is removed, press the "On"
button to start the welder.
An 8 amp slow blow fuse located on the front of the
machine protects the 115 volt auxiliary AC circuit (#31
and #32) from overload. If replacing use the same type
and size fuse.
IDEALARC® DC-1500
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