Overload Protection Shutdown

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.

Welding Power Overload Protection

CAUTION

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.)

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.

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