Main
LN-8 SEMIAUTOMATIC WIRE FEEDER
SERVICE MANUAL
SVM132-A
FOR ENGINE powered equipment.
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WARNING
ELECTRIC AND MAGNETIC FIELDS may be dangerous
SAFETY
ARC RAYS can burn.
ELECTRIC SHOCK can kill.
FUMES AND GASES can be dangerous.
FOR ELECTRICALLY powered equipment.
CYLINDER may explode if damaged.
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WELDING SPARKS can cause fire or explosion.
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PRCAUTIONS DE SRET
PRCAUTIONS DE SRET POUR LES MACHINES SOUDER TRANSFORMATEUR ET REDRESSEUR
MASTER TABLE OF CONTENTS FOR ALL SECTIONS
TABLE OF CONTENTS -INSTALLATION SECTION-
TECHNICAL SPECIFICATIONS LN-8
MOUNTING LOCATION
POWER SOURCE CONNECTIONS
LN-8N AND LN-8NE
LN-8S AND LN-8SE (AND CONVERTED LN-8N AND LN-8NE)
POWER SOURCE CONNECTION DIAGRAMS
A-6
FIGURE A.2 CONNECTION OF LN-8 TO AN IDEALARC R3S-400, 600 OR 800 (WITH LVC) (DISCONTINUED)
A-7
FIGURE A.3 CONNECTION OF LN-8 TO AN IDEALARC R3S-400, 600 OR 800 (WITHOUT LVC) (DISCONTINUED)
A-8
FIGURE A.4 CONNECTION OF LN-8 TO A SAM MOTOR-GENERATOR OR ENGINE DRIVEN WELDER
A-9
FIGURE A.5 CONNECTION OF LN-8 TO R3S-250 AND R3S-325
A-10
FIGURE A.6 CONNECTION OF LN-8 TO DC-600
A-11
FIGURE A.7 CONNECTION OF LN-8 TO DC-250, 400 AND CV/CVI POWER SOURCES
A-12
A-13
A-14
FIGURE A.10 FOR POWER SOURCES OTHER THAN LINCOLN ELECTRIC
INPUT CABLE CONNECTIONS
LN-8N AND LN-8S
LN-8NE AND LN-8SE
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GUN AND CABLE ASSEMBLIES
GENERAL
GUN CABLE CONNECTIONS
HANDLING PROCEDURES
LN-8S AND LN-8SE CONTINUOUS FLUX FEED (SUBMERGED ARC)
TABLE OF CONTENTS -OPERATION SECTION-
CONTROLS AND THEIR FUNCTIONS
CONSTANT CURRENT CONTROLS
SAFETY INSTRUCTIONS
CONSTANT VOLTAGE CONTROLS
CIRCUIT PROTECTION
AVOIDING GROUND LEAD PROTECTOR (GLP) ACTIVATION
WIRE FEED ROLLS AND GUIDE TUBES
SETTING FOR CV OR CC POWER SOURCES
WELDING WITH A CONSTANT VOLTAGE POWER SOURCE
WELDING WITH A CONSTANT CURRENT POWER SOURCE
WIRE REEL LOADING 50 AND 60 lb COILS (K303 WIRE REEL STAND)
WIRE REEL LOADING (K1524-1 UNIVERSAL WIRE REEL STAND)
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FEEDING ELECTRODE TO THE LN-8N OR LN-8S
FEEDING ELECTRODE TO THE LN-8NE OR LN-8SE (WITH EXTENSION)
WARNING WARNING
SLOW ACCELERATION STARTING (CODE 7926 AND ABOVE)
FLUX TANK LOADING
TABLE OF CONTENTS -ACCESSORIES SECTION-
GENERAL
K163 UNDERCARRIAGE (REQUIRES K303, K377, OR K378)
K178 MOUNTING PLATFORM
K261 METER KIT
K202 BURNBACK KIT
K58 MAGNETIC SEPARATOR
REEL MOUNTING ACCESSORIES
WELDING GUNS
INNERSHIELD GUNS
SUBMERGED ARC GUNS
GMAW GUNS
WELDING GUN ACCESSORIES
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MAINTENANCE
TABLE OF CONTENTS -MAINTENANCE SECTION-
MAINTENANCE
ROUTINE MAINTENANCE
DRIVE ROLLS AND GUIDE TUBES
WIRE REEL MOUNTING
PERIODIC MAINTENANCE
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GENERAL DESCRIPTION
POWER INPUT CIRCUITS
GUN TRIGGER AND 1CR RELAYCONTACT CONTROL CIRCUITS
VARIABLE VOLTAGE BOARD, METER SHUNT, WIRE SPEED AND REMOTE OUTPUT CONTROLS
SCR OPERATION
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TABLE OF CONTENTS -TROUBLESHOOTING AND REPAIR SECTION-
HOW TO USE TROUBLESHOOTING GUIDE
TROUBLESHOOTING & REPAIR
PC BOARD TROUBLESHOOTING PROCEDURES
TROUBLESHOOTING GUIDE
FUNCTION PROBLEMS
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WELDING PROBLEMS
LN-8 ELECTRICAL SEQUENCE OF OPERATION
F-11
F-11 FIGURE F.1 LN-8 ELECTRICAL SEQUENCE OF OPERATION (continued)
TRIGGER TRANSFORMER TEST
TRIGGER TRANSFORMER TEST
INTERNAL VOLTAGE TEST
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INTERNAL VOLTAGE TEST
1CR RELAYTEST
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1CR RELAYTEST
DRIVE MOTOR TEST
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MOTOR APPLIED VOLTAGE TEST
AFTER TESTING
POTENTIOMETER REPLACEMENT
POTENTIOMETER REPLACEMENT
CIRCUIT BREAKER REPLACEMENT
CIRCUIT BREAKER REPLACEMENT
GROUND LEAD PROTECTOR PUSH BUTTON SWITCH REPLACEMENT
GROUND LEAD PROTECTOR PUSH BUTTON SWITCH REPLACEMENT
TRIGGER TRANSFORMER REPLACEMENT
TRIGGER TRANSFORMER REPLACEMENT
PC BOARD REPLACEMENT
VARIABLE VOLTAGE BOARD REMOVALAND REPLACEMENT
PC BOARD REPLACEMENT
RELAYBOARD REMOVAL AND REPLACEMENT
CONTROL PC BOARD REMOVALAND REPLACEMENT
WIRE DRIVE ASSEMBLYAND COMPONENT REPLACEMENT
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RETEST AFTER REPAIR
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G-2
Wiring Diagram
2502 4504 53132A
162345 2502 4504 53132A
LN-8N, -8NE, -8S, AND -8SE WIRING DIAGRAM
G-2
G-3
M
CONNECTION SCHEMATIC
ELECTRODE TO POWER SOURCE
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
M
WORK TO POWER SOURCE
G-3
G-4
OPERATING SCHEMATIC
G-4
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G-7
CONTROL BOARD (L5767) LAYOUT
ITEM REQD. PART No.
FS
BAL CAL
G-7
G-8
VARIABLE VOLTAGE BOARD (L5039) LAYOUT
G-8
SVM ERROR REPORTING FORM