Lincoln Electric IM581 - Manual (Page 17)

B-3 OPERATION B-3
ENGINE CONTROLS
IGNITION SWITCH
When placed in the “ON” position, this switch energizes
the fuel solenoid. When placed in the “OFF” position,
the flow of fuel to the injection pump is stopped to shut
down the engine.
SPEED CONTROL LEVER
Manually allows the engine to run at its high idle speed
controlled by the governor or at the factory set low idle
speed. When welding, using air compressor or using
auxiliary power the speed control lever must be in the
“RUN” position. To reduce the engine to low idle speed
when not welding, not using the compressor or not
using auxiliary power place the speed control lever in
the “IDLE” position notch.
ENGINE TEMPERATURE GAUGE
Displays the coolant temperature in the engine block.
ENGINE OIL PRESSURE GAUGE
Displays the oil pressure to the engine. When the
engine starts running, watch for the oil pressure to
build up. If no pressure shows within 30 seconds, stop
the engine and consult the engine instruction manual.
BATTERY CHARGING AMMETER
Displays the current going from the charging alternator
into the batteries. It is normal for charging current to be
high (above 15 amps) after starting or when the batter-
ies are ‘low’ on charge.
ENGINE HOUR METER
The engine hour meter records the total running time
on the engine in hours. It can be used to keep a record
of maintenance on the engine and or welder.
ENGINE PROTECTION SYSTEM
The engine protection system shuts down the engine
under high coolant temperature or low engine oil pres-
sure conditions by allowing the fuel solenoid valve to
close.
WELDER CONTROLS
POLARITY SWITCH
Turn the Arc Polarity switch to electrode positive or
electrode negative as required for each particular
application.
CONTROL OF WELDING CURRENT
Purpose of Controls
The continuous “Current Control” is the main current
adjuster. The “Job Selector” is both a fine current
adjuster and the continuous Open Circuit Voltage
adjuster. Open Circuit Voltage (OCV) controls the arc
characteristics.
“Job Selector”
The “Job Selector” dial is divided into four colored sec-
tions providing OCV ranges as follows:
Color Title OCV Range
White Large Electrodes High OCV
Black Normal Welding Medium OCV
Red Overhead & Vertical Low OCV
Grey Special Applications Extra-Low OCV
The “Job Selector” is usually set in the black range
because it provides a soft “Buttering “ arc desired for
most welding. Some operators prefer to set the “Job
Selector” in the red range for a snappy “Digging” arc
when welding vertical up or overhead.
“Current Control”
Do not adjust the “Current Control” while welding
because this can damage the control.
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The “Current Control” dial is calibrated in amperes on
three separate colored dials corresponding to the
white, black and red ranges of the “Job Selector” dial.
For example: when the “Job Selector” is set on the
black range, the approximate welding current is indi-
cated on the black scale of the “Current Control” dial.
SAE400 WELD’N AIR
CAUTION