Lincoln Electric RANGER 305 D Service Manual page 63

RANGER 305D
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.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
WELD OUTPUT PROBLEMS
POSSIBLE AREAS OF
MISADJUSTMENT(S)
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 machines able to produce.
3. If the current seems about 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 connec-
tion 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.
C UTION
F 6
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. The engine RPM may be too
low. Perform the Engine
Throttle Adjustment test.
2. Connect the machine to a
resistive load bank. Connect
an accurate ammeter and volt
meter to the output of the
machine, (Meters are often
built into modern load banks.)
Connect a means of measuring
the engine RPM. (See the
Engine Throttle Adjustment
Test for recommended meth-
ods of measuring 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.