Lincoln Electric SVM128-A service manual Output Problems

Page 61

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F-7

 

 

 

F-7

 

TROUBLESHOOTING & REPAIR

 

 

 

 

TROUBLESHOOTING GUIDE

 

Observe Safety Guidelines

 

 

detailed in the beginning of this manual.

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

 

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

 

 

The engine starts and runs at the

1. Check the AC auxiliary output

1. Check for loose or faulty con-

 

correct speed, but there is no AC

circuit breakers. Reset is nec-

nections between the recepta-

 

auxiliary output voltage. The DC

essary.

cles, the circuit breakers, the

 

welding generator is functioning

2. Check the 115VAC and 230VAC

current

transformer and

the

 

correctly.

exciter alternator stator.

See

 

receptacles and plugs for loose

 

 

the Wiring Diagram.

 

 

 

 

or faulty connections.

 

 

 

 

 

 

 

 

 

 

 

2. Check

the 115VAC

and

 

 

 

230VAC windings in the alterna-

 

 

 

tor stator for shorted turns or

 

 

 

grounds.

Check the continuity

 

 

 

of the windings. See the Wiring

 

 

 

Diagram.

 

 

The engine starts and runs normal-

1. Contact your local Authorized

1. Check the “flashing” diode

ly. The machine takes a long time

Field Service Facility.

located on the DC generator

to “build-up” and produce output

 

brush holder. The diode may

voltage. The AC auxiliary voltage

 

be “shorted” or installed incor-

varies when the Fine Current

 

rectly.

Control rheostat is adjusted.

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353.

SA-250

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Contents SHIELD-ARCTMSA-250 SA-250 SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications SA-250 InstallationLocation and Ventilation Safety PrecautionsStoring PRE-OPERATION Engine Service Muffler Cooling SystemExhaust Spark Arrester TrailerWelding Cable Connections Electrical Output ConnectionsMachine Grounding Auxiliary Power RECEPTACLES, PLUGS, and HAND-HELD EquipmentCircuit Breakers SA-250 Table of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionDesign Features Operational Features and ControlsRecommended Applications WelderLimitations Welding CapabilityWELDER/GENERATOR Controls Controls and SettingsCurrent Range Selector Control of Welding CurrentFigure B.3 Diesel Engine Controls Diesel Engine ControlsBefore Starting the Engine Engine OperationStarting the Engine Check and fill the engine fuel tankCold Weather Starting Stopping the EngineBREAK-IN Period After you finish welding Welding OperationTable B.1 Range Settings for Wire SIZE/SPEED 12B-12 Auxiliary PowerTable of Contents Accessories OPTIONS/ACCESSORIES Semiautomatic Welding Accessories TIG Welding AccessoriesConnection of the LN-7 to Connection of Lincoln Electric Wire FeedersPIN Amphenol Unused Lead Individually Connection of the LN-25 toFigure C.4 SA-250/LN-25 Across the ARC Connection Diagram Control K487-25 Table of Contents Maintenance Engine Maintenance Routine and Periodic MaintenanceFigure D.1 OIL Drain and Refill Eliminate Air from the Fuel System HOW to Eliminate AIR from the Fuel System Figure D.4 Eliminating AIR from the Fuel System Self-vent methodFigure D.5 Engine Coolant Drain Plug Figure D.6 Tightening the FAN Belt Starting Engine Daily or BeforeFirst 25-50 Hours EveryCleaning the Battery Battery MaintenanceWELDER/GENERATOR Maintenance Idler Maintenance Figure D.5 Major Component Locations SA-250 Table of Contents Theory of Operation Section ALTERNATOR, and Protection Theory of OperationCircuits Auxiliary and Field Feedback Coils Excitation FlashingCurrent Range Selector Interpole and Series Coils Fine Current AdjustmentEngine Idler Circuit Mechanical Coupling DC Generator MachinesSA-250 Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board can be damaged by static electricity PC Board Troubleshooting Procedures Observe Safety Guidelines Troubleshooting Guide Detailed in the beginning of this manual Shunt Field Winding Test Field Shunt Winding Test Output Problems Function Problems Function Problems Troubleshooting & Repair Symptoms Misadjustments Course of Action Problems Possible AreasWelding Problems Test Description Alternator Rotor TestMaterials Needed Slip Rings Brushes Test ProcedureFigure F.2 Measuring Rotor Resistance Figure F.3 Measuring Rotor Resistance to Ground Field Shunt Winding Test Field Shunt Winding Test PIN TAB Idler Solenoid Test Idler Solenoid Test Engine Throttle Adjustment Test Strobe Tach Method Engine Throttle Adjustment TestOscilloscope Method Frequency Counter MethodAdjusting Screw Locking NUT Description Flashing the FieldsDo not remove brush holder ProcedureNormal Open Circuit Voltage Waveform 115VAC Supply Scope SettingsHigh Idle no Load Fine Current Control Rheostat AT Maximum Normal Open Circuit DC Weld Voltage Waveform Typical DC Weld Output Voltage Waveform Machine Loaded Selector Switch AT Maximum PositionAlternator Rotor Removal Replacement Alternator Rotor Removal ReplacementLoosen Screws Alternator Cover Slip Rings Brushes Figure F.13 Rotor Removal Replacement Alternator Stator Removal and Replacement Alternator Stator Removal ProcedureField Bridge Rectifier VAC Receptacle Circuit Breaker Genernator Brush HOLDER/COIL Cables Figure F.18 Drill Spot Locations Generator Frame Removal and Replacement See Figure F.19 for steps 4 Generator Frame RemovalFigure F.20 Wire and Selector Switch Connections Figure F.21 Case Front Removal Rope Sling ENGINE/GENERATOR Mounting Holes Troubleshooting & Repair Generator Armature Removal and Replacement Figure F.23 Blower Paddle Removal Generator Armature RemovalRetest After Repair AC Auxiliary Power Receptacle OutputEngine Output Welder DC OutputSA-250 Electrical Diagrams Section Section G SA-250 Wiring Diagram Electrical DiagramsWire Feed Module Wiring Diagram Idler PC Board M13708 Schematic Idler PC Board M13708 Components SVM Error Reporting Form
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