Lincoln Electric SP-100 service manual Overload Protection

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	OPERATION	B-6
FIGURE B.7	CHANGING MACHINE OVER TO FEED
	OTHER WIRE SIZES

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Gun Cable

Arc

Work Piece

6.Refer to Figure B.7. Connect work clamp to metal to be welded. Work clamp must make good elec- trical contact to the workpiece. The workpiece must also be grounded as stated in “Arc Welding Safety Precautions” in the beginning of this manu- al.

7.Position gun over joint. End of wire may be lightly touching the work.

The SP-100 is shipped from the factory ready to feed 0.023-0.025” (0,6 mm) diameter wire. To operate the SP-100 with other sizes of wire, it is necessary to change the contact tip and change the drive roll over to other sizes. Refer to Changing the Contact Tip and Changing the Drive Roll, in the MAINTENANCE sec- tion, for specific information on these procedures.

WELDING WITH INNERSHIELD

Welding with Innershield requires an Innershield Welding Kit. A gasless nozzle is provided in the Innershield Welding Kit. When using Innershield elec- trode, installing the gasless nozzle will improve visibili- ty of the arc and protect the gas diffuser from weld spatter. Additionally included is a gun cable liner to permit proper feeding of .035” (0,9 mm) Innershield wire. Refer to the ACCESSORIES section for details on obtaining this kit.

OVERLOAD PROTECTION

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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

OUTPUT OVERLOAD

The SP-100 is equipped with a circuit breaker which protects the machine from damage if maximum output is exceeded. The circuit breaker button will extend out when tripped. The circuit breaker must be manually reset.

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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 the SP-100.

CLEANING TIP AND NOZZLE

Clean the contact tip and nozzle to avoid arc bridging between the nozzle and contact tip which can result in a shorted nozzle, poor welds and an overheated gun. Hint: Anti-stick spray or gel, available from a welding supply distributor, may reduce buildup and aid in spat- ter removal.

THERMAL PROTECTION

The SP-100 has a rated output duty cycle of 20%. If the duty cycle is exceeded, a thermal protector will shut off the output until the machine cools to a normal operating temperature. This is an automatic function of the SP-100 and does not require user intervention.

WIRE FEED OVERLOAD PROTECTION

The SP-100 has an automatic electronic protection cir- cuit to protect the wire feed motor. If excessive motor overload occurs (due to excessive feeding force jammed drive rolls, or shorted motor leads) the circuit will shut down the wire feed motor and the welding power output.

The wire feed shut-down circuit will reset automatically when the gun trigger is released. However shut-down will reoccur if the overload situation is not corrected.

SP-100