Lincoln Electric SVM132-A instruction

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F-11	TROUBLESHOOTING AND REPAIR	F-11
	TROUBLESHOOTING AND REPAIR

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

WELDING

	RELEASE		BREAK
	GUN TRIGGER		BREAK
	GUN TRIGGER		WELDING ARC
			WELDING ARC


	OPENS 2-8 (NOTE 1)
	OPENS 2-8 (NOTE 1)		DE-ENERGIZES


			2 CR
			REED SWITCH


			OPENS INTERLOCK
			ON 1 CR (NOTE 2)

DE-ENERGIZES 1 CR

OPENS 2-4 CIRCUIT

OPENS 531-7	OPENS 683-32A CIRCUIT
	CLOSES 682-683

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DE-ENERGIZES POWER SOURCE PILOT RELAY

DE-ENERGIZES POWER SOURCE CONTACTOR

ELECTRODE IS COLD TO WORK

DISCONNECTS MOTOR ARMATURE

AND CONTROL CIRCUIT FROM INPUT AC LINE - (DE-ENERGIZES AUX. EQUIPMENT IF CONNECTED)

	REVERSES		3CR (NOTE 3)
	MOTOR FIELD		REED SWITCH
			MOMENTARILY
			MOMENTARILY
			CLOSES
	DYNAMIC BRAKE
	DYNAMIC BRAKE
	CURRENT FLOWS
	THROUGH FREE		DISCHARGES SLOW
	WHEELING DIODE (D-7 ON		ACCELERATION
	CONTROL BOARD)		CAPACITOR (C3 ON
			CONTROL BOARD)
			CONTROL BOARD)


	MOTOR STOPS
	MOTOR STOPS		RESETS SLOW
			RESETS SLOW
			ACCELERATION
			CIRCUIT

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UNIT READY

FOR NEXT WELD

NOTE 1: When interlock is open.

NOTE 2: When interlock is closed.

NOTE 3: 3 CR is not used on units with code no. 7926 and up.

LN-8

Image 61

Lincoln Electric SVM132-A service manual Figure F.1 LN-8 Electrical Sequence of Operation

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 K303 Electrode DiameterLN-8 with K377 LN-8 with K378 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 Input Cable Connections Cable Clamp Conductor Electrode Wire Reel BasecontrolLN-8N and LN-8S LN-8NE and LN-8SE Extension Tube Connector Connections to Wire FeederLocking Screw SELF-TAPPING Screw Hinge Handle Figure A.14 Wire Feeder Handle Installation GUN and Cable Assemblies Handling ProceduresLN-8S and LN-8SE Continuous Flux Feed Submerged ARC General Operation Controls and Their Functions Safety InstructionsConstant Current Controls Gouging Sparks 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 12 in./300 mm Diameter or 14 lb 6 kg To Mount 10 to 44 lb 4.5 to 20 kg SpoolsInnershield Coils READI-REELS a K438 READI-REEL Adapter Must be Used 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 K163 Undercarriage Requires K303, K377, or K378 K161 Mechanized Travel Power PackK178 Mounting Platform K58 Magnetic Separator 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 Receptacle ConnectorCircuit Applied Breaker Control Board 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 White BlackGreen Ground Yellow Blue TWO #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