Lincoln Electric SVM132-A service manual LN-8 Electrical Sequence of Operation

Page 60

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F-10

 

 

TROUBLESHOOTING AND REPAIR

 

F-10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LN-8 ELECTRICAL SEQUENCE OF OPERATION

 

 

 

 

 

FIGURE F.1 – LN-8 ELECTRICAL SEQUENCE OF OPERATION

 

 

 

 

 

TURN ON POWER SOURCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRESS GUN TRIGGER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOSES 524-528

 

 

 

 

 

 

 

 

 

 

 

 

ENERGIZES 1 CR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOSES 2-4 CIRCUIT

 

 

OPENS 682-683

 

 

 

 

CLOSES 683-32A CIRCUIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENERGIZES POWER

 

 

 

 

CLOSES 531-7

 

 

SOURCE PILOT RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REVERSES WIRE

 

ENERGIZES

 

 

FEED MOTOR

POWER SOURCE

ENERGIZES

FIELD

CONTACTOR

 

 

CONTROL CIRCUIT

 

 

 

 

 

(AND AUX. EQUIPMENT IF

 

 

ELECTRODE NOW

CONNECTED TO 7-32A)

 

 

 

 

 

 

"HOT" TO GROUND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRE FEEDS DOWN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ARC STARTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENERGIZES 2 CR

 

 

 

 

(REED SWITCH)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR ACCELERATES

 

 

INTERLOCKS 1 CR IF

 

 

TO WELDING SPEED

 

 

INTERLOCK SWITCH

 

 

 

 

 

 

 

 

 

IS CLOSED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WELDING

 

 

 

 

 

LN-8

 

 

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Page 59 Page 61
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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