Lincoln Electric SVM166-A service manual GUN and Cable Assemblies, Electrode Polarity, Connections

A-6 INSTALLATION A-6

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GUN AND CABLE ASSEMBLIES

A variety of Lincoln 10' (3.0m) or 15' (4.6m) gun and cable assemblies are available for use with the LN-15, including the Magnum™ models for GMAW, K126 or K115 models for Innershield®.

The LN-15 comes factory equipped with a K1500-2 gun connection kit, designed for guns having a Magnum Tweco™ compatible #2-#4 connector. Many other guns can easily be used with the LN-15 with other K1500 series gun connection kits.

Gun Cable Connection to the Feeder

Lay the cable out straight. Insert the connector on the welding conductor cable into the brass bushing on the front of the wire drive unit. Keep the all mating surfaces clean. Make sure it is fully seated and tighten the thumb screw.

Connect the control cable plug into the 5 pin recepta- cle on the front panel of the wire feeder.

ELECTRODE POLARITY

The LN-15 automatically adjusts for positive and nega- tive polarity. When welding with negative polarity pro- cedures, the voltmeter will display a "-" sign; example "-23.6" Volts.

PROCEDURE TO INSTALL DRIVE ROLLS AND WIRE GUIDES

WARNING

• Turn off input power at the welding power source before installation or changing drive roll and/or wire guides.

•Do not touch electrically live parts

0such as the wire drive or internal wiring.

•When feeding with the gun trigger, the electrode and wire drive mechanism are "hot" to work and ground and could remain energized several sec- onds after the gun trigger is released.

•Only qualified personnel should perform this operation.

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1.Turn OFF the welding power source.

2.Open the LN-15 case and then release the idle roll pressure arm.

3.Remove the outer wire guide by turning the knurled thumbscrews counter-clockwise to unscrew them from the feed plate.

4.Rotate the triangular shaped drive roll retaining mechanism to unlock the drive rolls and remove the drive rolls.

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CONNECTIONS

Across the Arc LN-15 models do not use a control cable.

Table A.2 Trigger Connector J1 (5 Pin)

PIN	Lead #	Function
A	556	Trigger
B	-	Not used
C	554	Trigger/ 83%
		Procedure ground
D	555	83% Procedure
E	554	Trigger/ 83%
		Procedure ground

5.Remove the inner wire guide.

6.Insert the new inner wire guide, groove side out, over the two locating pins in the feed plate.

7.Install a drive roll on each hub assembly and lock by rotating the triangular drive roll retaining mecha- nism.

8.Install the outer wire guide by aligning it with the pins and tightening the knurled thumbscrews.

9.Close the idle arm and engage the idle roll pressure arm. Adjust the pressure appropriately.

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LN-15