Lincoln Electric SVM134-A guide

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F-30

F-30

TROUBLESHOOTING & REPAIR

NORMAL OPEN CIRCUIT DC WELD VOLTAGE WAVEFORM

HIGH IDLE – NO LOAD – FINE CURRENT CONTROL RHEOSTAT AND SELECTOR

SWITCH AT MAXIMUM

0 volts

50 volts

5 ms

This is the typical DC welding output voltage generated from a properly operating machine. Note that each vertical division represents 50 volts and that each horizontal division represents 5 milliseconds in time.

Note: Scope probes connected at machine output terminals.

SCOPE SETTINGS

Volts/Div	50V/Div.
Horizontal Sweep	5 ms/Div.
Coupling	DC
Trigger	Internal

CLASSIC I

Image 74

Lincoln Electric SVM134-A service manual Normal Open Circuit DC Weld Voltage Waveform

Contents

Classic I TM Safety California Proposition 65 Warnings 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 Table of Contents Installation Section Installation Technical Specifications Classic Storing Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Exhaust Spark Arrester Cooling SystemMuffler Trailers Machine Grounding Figure A.1 Ground Stud Location Welding Cable Connections Auxiliary Power Receptacle PLUGS, and HAND-HELD EquipmentElectrical Output Connections Cable size for combined length Classic Table of Contents Operation Section Operating Instructions Safety InstructionsOperation Welder Operational Features and ControlsRecommended Applications Generator Controls and Settings WELDER/GENERATOR Controls Control of Welding Current Figure B.2 Current Controls Gasoline Engine Controls Return Section TOC Starting the Engine Engine OperationBefore Starting the Engine BREAK-IN Period Stopping the EngineCold Weather Starting Welding Operation After you finish welding Auxiliary Power Table B.1 Range Settings for Wire SIZE/SPEED Table of Contents Accessories OPTIONS/ACCESSORIES Semiautomatic Welding Accessories Connection of the LN-25 to Connection of Lincoln Electric Wire FeedersWire Feed Module see Figure C.1 Classic I Across the ARC with Classic Table of Contents Maintenance Safety Precautions Routine and Periodic Maintenance Engine Maintenance Figure D.1 OIL Drain and Refill MAX MIN Figure D.2A Engine Coolant Drain Plug Set the terminal gap with a feeler gauge or gapping After cleaning or when installing a new spark plugGap Specifications 0.032 inch .8 mm Tool. See Figure D.4 Battery Maintenance Classic I charging system is Negative WELDER/GENERATOR Maintenance Return to Section Return to Section TOC Idler Maintenance Figure D.5 Major Component Locations Classic Table of Contents Theory of Operation Section General Description BATTERY, STARTER, Engine Alternator and OIL Switch CircuitTheory of Operation Main SHUNT, Interpole and Series Coils ENGINE, Main Generator Armature and Frame and DC ExciterExcitation Flashing Engine Idler Circuit Fine Current AdjustmentCurrent Range Selector DC Generator Machines Return to Section TOC Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures PC Board can be damaged by static electricity Detailed in the beginning of this manual Troubleshooting GuideObserve Safety Guidelines Shunt Field Winding Test Main Generator Throttle Adjustment Test Output Problems Function Problems Troubleshooting & Repair Engine Problems Welding Problems Materials Needed DC Exciter TestTest Description Test Procedure DC Exciter Test Figure F.2 Exciter Cover Removal Small Flex Lead Solid Shunt Coil and Series Coil Resistance Tests Idler Solenoid Test Troubleshooting & Repair Main Generator Shunt Field Winding Test Main Generator Shunt Field Winding Test Figure F.6 Plug P10 PIN Assignments TAB Engine Throttle Adjustment Test Engine Throttle Adjustment Test Strobe Tach Method Engine Throttle Adjustment Test Adjust High Idle Adjust Low Idle Flashing the Fields Description Procedure Flashing the Fields Figure F.11 Brush HOLDER/BATTERY Jumper Connections High Idle no Load Fine Current Control Rheostat AT Maximum Scope SettingsNormal Open Circuit Voltage Waveform 115VDC Supply Normal Open Circuit DC Weld Voltage Waveform Machine Loaded Selector Switch AT Maximum Typical DC Weld Voltage Waveform DC Exciter Armature and Field Coils Removal and Replacement DC Exciter Armature and Field Coils DC Exciter Armature Removal ProcedureReassembly Field Coils Removal Procedure Perform the DC Exciter Armature Removal Procedure Main Generator Frame Removal and Replacement Replacement Main Generator Frame Removal Bolt / NUT Perform the DC Exciter Armature Removal Figure F.16 Selector Switch Lead Removal Terminal Lead Figure F.18 Choke Control Cable Removal Loosen Here Main Generator Frame Removal Figure F.20 Front Panel Fastener Removal Troubleshooting & Repair Feet Remove Mounting NUTS, Washers Bolts Perform the DC Exciter Armature Reassembly Procedure Main Generator Armature Removal and Replacement Main Generator Armature Removal Armature is now free to be removed from the engine Engine Output DC Auxiliary Power Receptacle OutputRetest After Repair Welder DC Output Electrical Diagrams Section Electrical Diagrams Wiring Diagram Classic Wire Feed Module Wiring Diagram Wiring Diagram Wire Feed Module Schematic Idler PC Board 16990 M PC Board Assembly Idler PC Board Idler