Manuals / Lincoln Electric / Power Tools / Welder

Lincoln Electric SVM132-A service manual Fuse Field

Models: SVM132-A

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E-4

THEORY OF OPERATION	E-4

FIGURE E.3 – VARIABLE VOLTAGE BOARD, METER SHUNT, WIRE SPEED,

AND REMOTE OUTPUT CONTROLS

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REMOTE

OUTPUT

CONTROL

	#21
#75							WIRE FEED
#76							WIRE FEED
#76							SPEED CONTROL
#77							SPEED CONTROL
#77
					CIRCUIT
					BREAKER
INPUT		#32							#32A
RECEPTACLE	#31
	#31
#2
&				2 OHMS
#4

C
O
N
T
A
C			#531
T
O
R
CONTROL


		OPTIONAL
		BURNBACK
		BOARD

									GLP

VARIABLE VOLTAGE	#567	ELECTRODE
BOARD		METER
BOARD		SHUNT
		SHUNT


CONTROL	ARMATURE	WIRE		THERMAL
CONTROL		FEED		CIRCUIT
BOARD		MOTOR		BREAKER

#3

2

A

FUSE

FIELD

RELAY

BOARD

GUN

CABLE

RECEPTACLE


REED		TRIGGER		WIRE		INTERLOCK
REED		TRIGGER		FEED		INTERLOCK
SWITCH		TRANS.		FEED		SWITCH
SWITCH		TRANS.		SWITCH		SWITCH
				SWITCH

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VARIABLE VOLTAGE BOARD, METER SHUNT, WIRE SPEED AND REMOTE OUTPUT CONTROLS

The optional variable voltage board enables the LN-8 to be used with a con- stant current power source. The vari- able voltage board monitors the arc voltage via leads #21 and #567 and modifies the wire feed speed according to arc voltage variations and require- ments.

The wire speed control dictates to the control board the directives of the

operator. The control board adjusts the armature voltage applied to the wire feed motor to change the motor speed.

The remote output control permits power source control from the LN-8 unit. The remote control is coupled to the welding power source via leads #75, #76, and #77 through the input receptacle.

The electrode meter shunt, which is connected to and also in series with the gun connector block, senses the weld- ing current and arc voltage. This infor- mation is used by the variable voltage board and also the optional meter kit.

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LN-8

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Lincoln Electric SVM132-A service manual Fuse Field

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