Lincoln Electric SVM132-A service manual GUN and Cable Assemblies, General, GUN Cable Connections

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A-18

INSTALLATION

A-18

 

 

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GUN AND CABLE ASSEMBLIES

GENERAL

The LN-8 is used with various guns. In all cases, the gun is shipped connected to the cable and is ready to weld. Use the gun recommended for the wire type (solid or cored) and size to be used. See the para- graph on Welding Guns in the Accessories Section for more information on the different types of guns.

GUN CABLE CONNECTIONS

Lay the cable out straight. Insert the male end of the welding conductor cable into the brass block on the front of the LN-8. Make sure it is in all the way and tighten the locking screw with a 3/16 in. Allen wrench. Keep this connection clean and bright. Connect the control cable polarized plug into the receptacle next to the coupling.

HANDLING PROCEDURES

1.Do not kink or pull the cable around sharp corners.

2.Keep the electrode cable as straight as practical when welding or starting the electrode through the cable.

3.Do not allow dolly wheels or trucks to run over the cables.

4.Keep the cable clean by following the maintenance instructions.

5.Use only clean, rust-free electrode wire.

6.Replace contact tip when the arc starts to become unstable or the contact tip end is fused or deformed.

LN-8S AND LN-8SE CONTINUOUS FLUX FEED (SUBMERGED ARC)

Connect the loose end of the hose to the tube at the back end of the welding gun. Tighten the hose clamp. If the hose is taped to the gun cable, be sure it is not collapsed or deformed as this could cause flux feed- ing problems.

The air for the automatic flux feeding system is obtained from the regular plant compressed air sys- tem, providing the plant system pressure is between 60 and 120 psi (414 and 827 kPa). The tank is equipped with a pressure regulator to reduce the input pressure to the 30 psi (207 kPa) required for the flux feeding system. This pressure is set at the factory before the machine is shipped. When the LN-8SE with the 22-1/2 or 45 ft. (6.9 or 13.7 m) extension is used, and the flux hose is long, set the air pressure at 45 psi (310 kPa) for 1/2 in. (12 mm) I.D. hose, and 55 psi (379 kPa) for 3/8 in. (9.5 mm) I.D. hose. Exact pressure is indicated on the pressure gage. Air con- sumption is normally less than 1.5 cubic feet (4.2 cubic meters) per minute of welding.

Connect the input air hose to the street elbow located at the right side of the flux tank. A quick disconnect should be installed between the elbow and the input hose.

The air tank is equipped with a water and dirt separa- tor. Water separated from the input air feeds down through the long flux filled tube located at the input connection. It is exhausted from the system through the coiled tube below the flux tank. There is always a small amount of air and possibly water coming out of the end of this tube.

LN-8

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Contents LN-8 Semiautomatic Wire Feeder Safety LN-8Electric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Installation Electrode Diameter LN-8 with K303LN-8 with K377 LN-8 with K378Power Source Connections Table A.1 Work Lead SpecificationsLN-8N and LN-8NE Power Source Selection Switch Variable Voltage PC Board LN-8S and LN-8SE and Converted LN-8N and LN-8NEPower Source Connection Diagrams Table A.2 LN-8 Power Source Connection DiagramsSection TOC Installation TOC 9A-9 Figure A.5 Connection of LN-8 to R3S-250 and R3S-32510A-10 Figure A.6 Connection of LN-8 to DC-600Power Source To LN-8 Input Cable Plug Control Cable LN-8 for Same Polarity Operation LN-8 for Opposite Polarity Operation Shock Can KillFigure A.10 for Power Sources Other than Lincoln Electric 14A-14Cable Clamp Conductor Electrode Wire Reel Basecontrol Input Cable ConnectionsLN-8N and LN-8S LN-8NE and LN-8SEConnections to Wire Feeder Extension Tube ConnectorLocking ScrewFigure A.14 Wire Feeder Handle Installation SELF-TAPPING Screw Hinge HandleHandling Procedures GUN and Cable AssembliesLN-8S and LN-8SE Continuous Flux Feed Submerged ARC GeneralOperation Safety Instructions Controls and Their FunctionsConstant Current Controls Gouging SparksConstant Voltage Controls Current Controls VoltageCircuit Protection Avoiding Ground Lead Protector GLP ActivationWire Feed Rolls and Guide Tubes Figure B.3 Wire Feed Rolls and Guide Tube InstallationSetting for CV or CC Power Sources Voltage Power Source Welding with a ConstantMounting a 50 or 60 lb Coil Slots Coil ReelWire Reel Loading K1524-1 Universal Wire Reel Stand K363-P READI-REEL AdapterAdapter To Mount 10 to 44 lb 4.5 to 20 kg Spools 12 in./300 mm Diameter or 14 lb 6 kgInnershield Coils READI-REELS a K438 READI-REEL Adapter Must be UsedFeeding Electrode to the LN-8N or LN-8S Feeding Electrode to the LN-8NE or LN-8SE with ExtensionBrass Blocks Hand Crank ARM Flux Tank Loading Slow Acceleration Starting Code 7926 and AboveAccessories Table C.1 LN-8 Wire Feeder Accessories GeneralK161 Mechanized Travel Power Pack K163 Undercarriage Requires K303, K377, or K378K178 Mounting Platform K58 Magnetic SeparatorReel Mounting Accessories Welding Guns Welding GUN Accessories Constant Current Conversion PartsLN-8 Maintenance Table of Contents Maintenance SectionRoutine Maintenance Periodic Maintenance Table of Contents Theory of Operation Section Theory of OperationPower Input Circuits General DescriptionGUN Trigger and 1CR Relay Contact Control Circuits Figure E.2 GUN Trigger and 1CR Contact Control CircuitsFuse Field SCR Operation 5E-5Applied Later CYCLE, the SCR Output Is Decreased LN-8 Troubleshooting and Repair HOW to USE Troubleshooting Guide Return to Return to Section TOCTroubleshooting & Repair PC Board Troubleshooting ProceduresTroubleshooting Guide Problems SymptomsFunction Problems Transformer Test Perform the 1CR Relay Test Feeding Problems Welding Problems LN-8 Electrical Sequence of Operation Figure F.1 LN-8 Electrical Sequence of Operation Trigger Transformer Test Test DescriptionTrigger Transformer Test Internal Voltage Test Connector ReceptacleCircuit Applied Breaker Control BoardInternal Voltage Test Table F.1 Voltage Test Points1CR Relay Test 1CR Relay Test 1CR Relay Test Table F.2 Relay Test Terminal ConnectionsDrive Motor Test Drive Motor Test Figure F.6 GUN Terminal Jumper Locations 1CRTo further check the drive motor Table F.3 Drive Motor Test PointsPotentiometer Replacement Repair Procedure Circuit Breaker Replacement Ground Lead Protector Switch Mount Flatwasher Lockwasher NUT Retaining NUTGround Lead Protector Push Button Switch Replacement Ground Lead Protector Push Button Trigger Transformer Replacement Relay PC Board Roundhead Screw Insulation Sheet Trigger Transformer NUTPC Board Replacement Figure F.10 PC Board Locations Control PC Board Variable Voltage PC Board Relay PC BoardRelay Board Removal Control PC Board Replacement Wire Drive Assembly and Component Replacement Black WhiteGreen Ground Yellow Blue TWOShunt #568 #567Motor Gearbox Insulation Sheet Mounting PlateTOC Retest After Repair Electrical Diagrams LN-8N, -8NE, -8S, and -8SE Wiring Diagram Connection Schematic Source Power to WorkOperating Schematic 1CR Wire Feed Motor FieldControl Board L5767 Schematic Variable Voltage Board L5039 Schematic Control Board L5767 Layout ControlVariable Voltage Board L5039 Layout SVM Error Reporting Form
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