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OPERATION
B2.3 B2.3
CLASSIC® 300D & 300G
ENGINE BREAK-IN
Lincoln Electric selects high quality, heavy-duty industrial
engines for the portable welding machines we offer.
While it is normal to see a small amount of crankcase oil
consumption during initial operation, excessive oil use,
wet stacking (oil or tar like substance at the exhaust port),
or excessive smoke is not normal.
Larger machines with a capacity of 350 amperes and
higher, which are operated at low or no-load conditions for
extended periods of time are especially susceptible to the
conditions described above. To accomplish successful
engine break-in, most diesel-powered equipment needs
only to be run at a reasonably heavy load within the rating
of the welder for some period of time during the engineʼs
early life. However, if the welder is subjected to extensive
light loading, occasional moderate to heavy loading of the
engine may sometimes be necessary. Caution must be
observed in correctly loading a diesel/generator unit.
1. Connect the welder output studs to a suitable resis-
tive load bank. Note that any attempt to short the
output studs by connecting the welding leads togeth-
er, direct shorting of the output studs, or connecting
the output leads to a length of steel will result in cat-
astrophic damage to the generator and voids the
warranty.
2. Set the welder controls for an output current and volt-
age within the welder rating and duty cycle. Note that
any attempt to exceed the welder rating or duty cycle
for any period of time will result in catastrophic dam-
age to the generator and voids the warranty.
3. Periodically shut off the engine and check the
crankcase oil level.
WELDER OPERATION
DUTY CYCLE
The NEMA output rating of the Classic® 300D Perkins is 300
amperes at 32 arc volts on a 60% duty cycle (consult
Specifications in this manual for alternate ratings). Duty
cycle is based on a ten minute period; thus, the welder can
be loaded at rated output for six minutes out of every ten
minute period.
CONTROL OF WELDING CURRENT
DO NOT TURN THE “CURRENT RANGE SELECTOR”
WHILE WELDING because the current may arc between
the contacts and damage the switch.
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The “Current Range Selector” provides five overlapping cur-
rent ranges. The “Fine Current Adjustment” adjusts the cur-
rent from minimum to maximum within each range. Open cir-
cuit voltage is also controlled by the “Fine Current
Adjustment” permitting control of the arc characteristics.
A high open circuit voltage setting provides the soft “butter-
ing” arc with best resistance to pop-outs preferred for most
welding. To get this characteristic, set the “Current Range
Selector” to the lowest setting that still provides the current
you need and set the “Fine Current Adjustment” near maxi-
mum.
For example: to obtain 175 amps and a soft arc, set the
“Current Range Selector” to the 190-120 position and then
adjust the “Fine Current Adjustment” for 175 amps.
When a forceful “digging” arc is required, usually for vertical
and overhead welding, use a higher “Current Range
Selector” setting and lower open circuit voltage.
For example: to obtain 175 amps and a forceful arc, set the
“Current Range Selector” to the 240-160 position and the
“Fine Current Adjustment” setting to get 175 amps.
Some arc instability may be experienced with EXX10 elec-
trodes when trying to operate with long arc techniques at set-
tings at the lower end of the open circuit voltage range.
DO NOT attempt to set the “Current Range Selector” between
the five points designated on the nameplate.
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These switches have a spring loaded cam which almost elim-
inates the possibility of setting this switch between the des-
ignated points.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and ground.
FUMES & GASES can be dangerous.
• Keep your head out of the fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
WARNING
ARC RAYS can burn.
• Wear eye, ear, and body protection.
CAUTION
CAUTION
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