Fuse Field | Lincoln Electric SVM132-A specs

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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

Image 48

Lincoln Electric SVM132-A service manual Fuse Field

Contents

LN-8 Semiautomatic Wire Feeder Safety LN-8 Electric Shock can kill Welding Sparks can cause fire or explosion Iii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Installation Electrode Diameter LN-8 with K303LN-8 with K377 LN-8 with K378 Power 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-8NE Power Source Connection Diagrams Table A.2 LN-8 Power Source Connection Diagrams Section TOC Installation TOC 9A-9 Figure A.5 Connection of LN-8 to R3S-250 and R3S-325 10A-10 Figure A.6 Connection of LN-8 to DC-600 Power Source To LN-8 Input Cable Plug Control Cable LN-8 for Same Polarity Operation LN-8 for Opposite Polarity Operation Shock Can Kill Figure A.10 for Power Sources Other than Lincoln Electric 14A-14 Cable Clamp Conductor Electrode Wire Reel Basecontrol Input Cable ConnectionsLN-8N and LN-8S LN-8NE and LN-8SE Connections to Wire Feeder Extension Tube ConnectorLocking Screw Figure A.14 Wire Feeder Handle Installation SELF-TAPPING Screw Hinge Handle Handling Procedures GUN and Cable AssembliesLN-8S and LN-8SE Continuous Flux Feed Submerged ARC General Operation Safety Instructions Controls and Their FunctionsConstant Current Controls Gouging Sparks Constant Voltage Controls Current Controls Voltage Circuit Protection Avoiding Ground Lead Protector GLP Activation Wire Feed Rolls and Guide Tubes Figure B.3 Wire Feed Rolls and Guide Tube Installation Setting for CV or CC Power Sources Voltage Power Source Welding with a Constant Mounting a 50 or 60 lb Coil Slots Coil Reel Wire 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 Used Feeding 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 Above Accessories Table C.1 LN-8 Wire Feeder Accessories General K161 Mechanized Travel Power Pack K163 Undercarriage Requires K303, K377, or K378K178 Mounting Platform K58 Magnetic Separator Reel Mounting Accessories Welding Guns Welding GUN Accessories Constant Current Conversion Parts LN-8 Maintenance Table of Contents Maintenance Section Routine Maintenance Periodic Maintenance Table of Contents Theory of Operation Section Theory of Operation Power Input Circuits General Description GUN Trigger and 1CR Relay Contact Control Circuits Figure E.2 GUN Trigger and 1CR Contact Control Circuits Fuse 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 TOC Troubleshooting & Repair PC Board Troubleshooting Procedures Troubleshooting Guide Problems Symptoms 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 Trigger Transformer Test Test Description Trigger Transformer Test Internal Voltage Test Connector ReceptacleCircuit Applied Breaker Control Board Internal Voltage Test Table F.1 Voltage Test Points 1CR Relay Test 1CR Relay Test 1CR Relay Test Table F.2 Relay Test Terminal Connections Drive Motor Test Drive Motor Test Figure F.6 GUN Terminal Jumper Locations 1CR To further check the drive motor Table F.3 Drive Motor Test Points Potentiometer Replacement Repair Procedure Circuit Breaker Replacement Ground Lead Protector Switch Mount Flatwasher Lockwasher NUT Retaining NUT Ground Lead Protector Push Button Switch Replacement Ground Lead Protector Push Button Trigger Transformer Replacement Relay PC Board Roundhead Screw Insulation Sheet Trigger Transformer NUT PC Board Replacement Figure F.10 PC Board Locations Control PC Board Variable Voltage PC Board Relay PC Board Relay Board Removal Control PC Board Replacement Wire Drive Assembly and Component Replacement Black WhiteGreen Ground Yellow Blue TWO Shunt #568 #567 Motor Gearbox Insulation Sheet Mounting Plate TOC Retest After Repair Electrical Diagrams LN-8N, -8NE, -8S, and -8SE Wiring Diagram Connection Schematic Source Power to Work Operating Schematic 1CR Wire Feed Motor Field Control Board L5767 Schematic Variable Voltage Board L5039 Schematic Control Board L5767 Layout Control Variable Voltage Board L5039 Layout SVM Error Reporting Form