1CR Relay Test | Lincoln Electric SVM132-A specification

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F-17	TROUBLESHOOTING AND REPAIR	F-17
	TROUBLESHOOTING AND REPAIR

1CR RELAY TEST

WARNING

Service and repair should be performed only by Lincoln Electric factory trained per- sonnel. Unauthorized repairs performed on this equipment could result in danger to the technician or the machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precau- tions detailed throughout this manual.

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric service department for technical troubleshooting assistance before you proceed.

Call (800) 833-9353 (WELD).

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TEST DESCRIPTION

This test will determine if the control relay is functioning properly by measuring the resistance across the contacts when the relay is energized and de-energized.

This procedure takes approximately 15 minutes to perform.

MATERIALS NEEDED

Volt-Ohmmeter 24VDC power supply 5/16 in. nutdriver

LN-8

Image 67

Lincoln Electric SVM132-A service manual 1CR Relay Test

Contents

LN-8 Semiautomatic Wire Feeder LN-8 Safety Electric Shock can kill Iii Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation LN-8 with K378 Electrode DiameterLN-8 with K303 LN-8 with K377 Table A.1 Work Lead Specifications Power Source ConnectionsLN-8N and LN-8NE LN-8S and LN-8SE and Converted LN-8N and LN-8NE Power Source Selection Switch Variable Voltage PC Board Table A.2 LN-8 Power Source Connection Diagrams Power Source Connection Diagrams Section TOC Installation TOC Figure A.5 Connection of LN-8 to R3S-250 and R3S-325 9A-9 Figure A.6 Connection of LN-8 to DC-600 10A-10 Power Source To LN-8 Input Cable Plug Control Cable LN-8 for Same Polarity Operation Shock Can Kill LN-8 for Opposite Polarity Operation 14A-14 Figure A.10 for Power Sources Other than Lincoln Electric LN-8NE and LN-8SE Cable Clamp Conductor Electrode Wire Reel BasecontrolInput Cable Connections LN-8N and LN-8S Screw Connections to Wire FeederExtension Tube Connector Locking SELF-TAPPING Screw Hinge Handle Figure A.14 Wire Feeder Handle Installation General Handling ProceduresGUN and Cable Assemblies LN-8S and LN-8SE Continuous Flux Feed Submerged ARC Operation Gouging Sparks Safety InstructionsControls and Their Functions Constant Current Controls Current Controls Voltage Constant Voltage Controls Avoiding Ground Lead Protector GLP Activation Circuit Protection Figure B.3 Wire Feed Rolls and Guide Tube Installation Wire Feed Rolls and Guide Tubes Setting for CV or CC Power Sources Welding with a Constant Voltage Power Source Slots Coil Reel Mounting a 50 or 60 lb Coil K363-P READI-REEL Adapter Wire Reel Loading K1524-1 Universal Wire Reel StandAdapter READI-REELS a K438 READI-REEL Adapter Must be Used To Mount 10 to 44 lb 4.5 to 20 kg Spools12 in./300 mm Diameter or 14 lb 6 kg Innershield Coils Feeding Electrode to the LN-8NE or LN-8SE with Extension Feeding Electrode to the LN-8N or LN-8SBrass Blocks Hand Crank ARM Slow Acceleration Starting Code 7926 and Above Flux Tank Loading Accessories General Table C.1 LN-8 Wire Feeder Accessories K58 Magnetic Separator K161 Mechanized Travel Power PackK163 Undercarriage Requires K303, K377, or K378 K178 Mounting Platform Reel Mounting Accessories Constant Current Conversion Parts Welding Guns Welding GUN Accessories LN-8 Table of Contents Maintenance Section Maintenance Routine Maintenance Periodic Maintenance Theory of Operation Table of Contents Theory of Operation Section General Description Power Input Circuits Figure E.2 GUN Trigger and 1CR Contact Control Circuits GUN Trigger and 1CR Relay Contact Control Circuits Fuse Field 5E-5 SCR OperationApplied Later CYCLE, the SCR Output Is Decreased LN-8 Troubleshooting and Repair Return to Return to Section TOC HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures Troubleshooting & Repair Problems Symptoms Troubleshooting Guide Function 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 Test Description Trigger Transformer Test Trigger Transformer Test Internal Voltage Test Control Board ConnectorReceptacle Circuit Applied Breaker Table F.1 Voltage Test Points Internal Voltage Test 1CR Relay Test 1CR Relay Test Table F.2 Relay Test Terminal Connections 1CR Relay Test Drive Motor Test Drive Motor Test 1CR Figure F.6 GUN Terminal Jumper Locations Table F.3 Drive Motor Test Points To further check the drive motor Potentiometer Replacement Repair Procedure Circuit Breaker Replacement Retaining NUT Ground Lead Protector Switch Mount Flatwasher Lockwasher NUT Ground Lead Protector Push Button Switch Replacement Ground Lead Protector Push Button Trigger Transformer Replacement Insulation Sheet Trigger Transformer NUT Relay PC Board Roundhead Screw PC Board Replacement Control PC Board Variable Voltage PC Board Relay PC Board Figure F.10 PC Board Locations Relay Board Removal Control PC Board Replacement Wire Drive Assembly and Component Replacement Blue TWO BlackWhite Green Ground Yellow #568 #567 Shunt Gearbox Insulation Sheet Mounting Plate Motor TOC Retest After Repair Electrical Diagrams LN-8N, -8NE, -8S, and -8SE Wiring Diagram Source Power to Work Connection Schematic 1CR Wire Feed Motor Field Operating Schematic Control Board L5767 Schematic Variable Voltage Board L5039 Schematic Control Control Board L5767 Layout Variable Voltage Board L5039 Layout SVM Error Reporting Form