Lincoln Electric IM366 SP-100 - Manual (Page 14)

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4. Depress the gun trigger switch and feed welding
wire through the gun and cable (Point gun away
from yourself and others while feeding wire.)
Release gun trigger after wire appears at end of
gun.
5. Replace contact tip and gas nozzle.
6. Cut the wire off 1/4 – 3/8" (6 – 10 mm) from the end
of the tip. The SP-100 is now ready to weld.
Making A Weld
1. See “Recommended Processes and Equipment”
section for selection of welding wire and shielding
gas and for range of metal thicknesses that can be
welded.
2. See the Applications chart on the inside of wire
feed section door for information on setting the
SP-100 controls.
3. Set the Voltage (“V”) and Wire Speed (“oIo”) con-
trols to the settings suggested for the welding wire
and base metal thickness being used.
4. Check that the polarity is correct for the welding
wire being used and that the gas supply, if
required, is turned on.
5. When using Innershield ® electrode, remove the
gas nozzle and install the gasless nozzle. This will
improve visibility of the arc and protect the gas dif-
fuser from weld spatter.
6. Connect work clamp to metal to be welded. Work
clamp must make good electrical contact to the
workpiece. The workpiece must also be grounded
as stated in “Arc Welding Safety Precautions”.
7. Position gun over joint. End of wire may be lightly
touching the work.
8. Lower welding helmet, close gun trigger, and
begin welding. Hold the gun so the contact tip to
work distance is about 3/8 inch (10 mm).
9. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out.
10. When no more welding is to be done, close valve
on gas cylinder (if used), momentarily operate gun
trigger to release gas pressure, and turn off SP-
100.
OVERLOAD PROTECTION SHUTDOWN
Welding Power Overload Protection
Exceeding the maximum rating of the SP-100 can
reduce the life of the machine.
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The SP-100 has both a thermostat and a circuit break-
er to protect the machine from damage if the maxi-
mum output is exceeded. If either device is tripped,
there will be no wire feed or output voltage when the
gun trigger is depressed. (The fan will continue to
run.)
CAUTION
If the machine shuts down due to an output overload,
first check the circuit breaker which is located on the
inside panel of the wire feed section. If the button is
extended, reset after several minutes of cooling, by
depressing the button.
If there is no output and the circuit breaker is not
tripped, the internal thermostat has probably tripped.
This device will automatically reset after several min-
utes of cooling. Leaving the machine on with the fan
motor running will cool the machine at a faster rate,
allowing the thermostat to reset sooner.
If the SP-100 does not operate and the fan does not
run with the machine ON (“I”), the power supply
branch circuit protection (circuit breaker or fuse) has
tripped.
Wire Feed Overload Protection
The SP-100 has an automatic electronic protection
circuit to protect the wire feed motor. If excessive
motor overload occurs (due to prolonged excessive
feeding force, jammed drive rolls or shorted motor
leads), the circuit will shutdown the wire feed motor
and the welding power output.
The wire feed shutdown will reset automatically when
the gun trigger is released, but will reoccur if the over-
load situation is not corrected. The two most common
causes of wire feed overload are an excessively bent
gun cable and a plugged contact tip. (See
Maintenance and Troubleshooting Section.)
The serviceability of a product or structure utilizing
this type of information is and must be the sole
responsibility of the builder/user. Many variables
beyond the control of The Lincoln Electric Company
affect the results obtained in applying this type of
information. These variables include, but are not
limited to, welding procedure, plate chemistry and
temperature, weldment design, fabrication methods
and service requirements.