Lincoln Electric RANGER 305G EFI Service Manual page 12

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine will weld, but the
welding arc is "cold". The
engine runs normally and the
auxiliary power is normal.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELD OUTPUT PROBLEMS
1. Make sure the machine is
properly set for the electrode
and process being used. Check
electrode size, mode switch
setting, amps or voltage
setting. If gas is used, make
sure the correct type of gas is
used and that the gas flow is
set correctly.
2. Make sure that the process
does not demand more power
than the machine is able to
produce.
3. If the current seems right
but the electrode easily sticks
in the puddle, try increasing the
"ARC CONTROL" setting.
4. Check for loose or faulty
connections at the weld output
terminals and welding cable
connections.
5. Check for adequate
connection between the work
cable and the work piece. The
work cable should be attached
to clean metal, as close to the
weld area as practical. The
work clamp must be in good
condition and have adequate
spring tension.
6. The weld cables may be too
long and/or too small, causing
excessive voltage drop between
the machine and the arc.
7. The weld cables may be
coiled or wrapped around
metal reels or racks. This can
cause excessive electrical
inductance in the weld circuit.
Ranger® 305G EFI Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. The engine RPM may be too
low.
2. Connect the machine to a
resistive load bank. Connect an
accurate ammeter and
voltmeter to the output of the
machine (meters are often built
into modern load banks). Then
connect a means of measuring
the engine RPM.
3. Place the mode switch in the
"CC-STICK" position, turn the
output control fully clockwise,
place the idle switch in the
"HIGH IDLE" position. Set the
weld terminals switch to
"WELD TERMINALS ON"
position.
4. Make sure that nothing is
plugged into either of the
Amphenol receptacles.
5. Start the machine and allow
the engine to run for about a
minute. Apply a load with the
resistance load bank and adjust
until the external meters read
about 305 amps and about 29
VDC. If the machine will not
produce this output, apply as
much load as possible.
6. With the above load applied,
the engine should maintain at
least 3350 RPM. If the engine
cannot maintain this RPM,
make sure there is an adequate
supply of clean, fresh fuel.
Check the fuel filter and the air
filter. Replace any filter that is
dirty or damaged. If this does
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