Lincoln Electric SVM125-A service manual PC Board Troubleshooting Procedures

Page 53

TOC

TOC

F-3

F-3

TROUBLESHOOTING & REPAIR

PC BOARD TROUBLESHOOTING PROCEDURES

Return to Section

Return to Section TOC

Return to Master

Return to Master TOC

WARNING

ELECTRIC SHOCK can kill.

Have an electrician install and service this equipment. Turn the machine OFF before working on equipment. Do not touch electrically hot parts.

Sometimes machine failures appear to be due to PC board failures. These problems can sometimes be traced to poor electrical connections. To avoid prob- lems when troubleshooting and replacing PC boards, please use the following procedure:

1.Determine to the best of your technical ability that the PC board is the most likely component causing the failure symptom.

2.Check for loose connections at the PC board to assure that the PC board is properly connected.

3.If the problem persists, replace the suspect PC board using standard practices to avoid static elec- trical damage and electrical shock. Read the warn- ing inside the static resistant bag and perform the following procedures:

•Remove the PC Board from the static-shielding bag and place it directly into the equipment. Don’t set the PC Board on or near paper, plastic or cloth which could have a static charge. If the PC Board can’t be installed immediately, put it back in the static-shielding bag.

•If the PC Board uses protective shorting jumpers, don’t remove them until installation is complete.

•If you return a PC Board to The Lincoln Electric Company for credit, it must be in the static-shielding bag. This will prevent further damage and allow prop- er failure analysis.

4.Test the machine to determine if the failure symp- tom has been corrected by the replacement PC board.

NOTE: Allow the machine to heat up so that all electri- cal components can reach their operating tem- perature.

5. Remove the replacement PC board and substitute

it with the original PC board to recreate the original

problem.

a. If the original problem does not reappear

by substituting the original board, then the

PC board was not the problem. Continue

to look for bad connections in the control

wiring harness, junction blocks, and termi-

Return to Section TOC

Return to Master TOC

ATTENTION

Static-Sensitive

Devices

Handle only at

Static-Safe

Workstations

Reusable

Container

Do Not Destroy

PC Board can be damaged by static electricity.

•Remove your body’s static charge before opening the static-shielding bag. Wear an anti-static wrist strap. For safety, use a 1 Meg ohm resistive cord connected to a grounded part of the equipment frame.

•If you don’t have a wrist strap, touch an unpainted, grounded, part of the equipment frame. Keep touching the frame to prevent sta- tic build-up. Be sure not to touch any electrically live parts at the same time.

nal strips.

b. If the original problem is recreated by the

substitution of the original board, then the

PC board was the problem. Reinstall the

replacement PC board and test the

machine.

6. Always indicate that this procedure was followed

when warranty reports are to be submitted.

NOTE: Following this procedure and writing on the warranty report, “INSTALLED AND SWITCHED PC BOARDS TO VERIFY PROB- LEM,” will help avoid denial of legitimate PC board warranty claims.

Return to Section TOC

Return to Master TOC

•Tools which come in contact with the PC Board must be either conductive, anti-static or static-dissipative.

CLASSIC II

Page 52 Page 54
Image 53
Page 52 Page 54
Contents Classic II TM California Proposition 65 Warnings 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 Classic InstallationStoring Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Spark Arrester Muffler UndercarriagesWelding Cable Connections Electrical Output ConnectionsCircuit Breakers Auxiliary Power RECEPTACLES, PLUGS, and HAND-HELD EquipmentMachine Grounding Classic Table of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionDesign Features Operational Features and ControlsRecommended Applications WelderLimitations Welding CapabilityWELDER/GENERATOR Controls Controls and SettingsFigure B.2 Current Controls Control of Welding CurrentReturn to Diesel Engine ControlsBefore Starting the Engine Engine OperationStarting the Engine Check and fill the engine fuel tankBREAK-IN Period Stopping the EngineCold Weather Starting Idler Operation Welding OperationGeneral Information Figure B.4 Welding Circuit Connections for Stick Welding After you finish weldingTable B.1 Range Settings for Wire SIZE/SPEED 13B-13 Auxiliary PowerSuggested Power Applications Running Watts Start-up Watts Table B.2 Generator Power ApplicationsTable of Contents Accessories Accessory Kit K703 Includes the following OPTIONS/ACCESSORIESSemiautomatic Welding TIG WeldingAdapter see Figure C.1 Connection of Lincoln Electric Wire FeedersConnection of the LN-7 to Classic II Using K867 Universal Adapter Work Electrode Cable To LN-7 Figure C.3 Classic II/LN-25 Connection Diagram With K444-2 Remote Control K487-25 Table of Contents Maintenance Engine Maintenance Routine and Periodic MaintenanceFigure D.1 OIL Drain and Refill Figure D.2 Tightening the Cooling Blower Belt Starting Engine Daily or BeforeFirst 50 Hours Every 50 HoursChecking Specific Gravity Battery MaintenanceIdler Maintenance WELDER/GENERATOR MaintenanceFigure D.3 Major Component Locations Table of Contents Theory of Operation Section Circuits Theory of OperationALTERNATOR, and Protection Interpole and Series Coils Excitation FlashingAuxiliary and Field Feedback Coils Engine Idler Circuit Fine Current AdjustmentCurrent Range Selector DC Generator Machines Classic Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board can be damaged by static electricity PC Board Troubleshooting ProceduresDetailed in the beginning of this manual Troubleshooting GuideObserve Safety Guidelines Shunt Field Winding Test Perform the Shunt Field Wind Troubleshooting & Repair Function Problems Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Welding Problems Materials Needed Alternator Rotor TestTest Description Alternator Rotor Test Test ProcedureFigure F.2 Measuring Rotor Resistance Classic Figure F.3 Measuring Rotor Resistance to Ground Classic Shunt Field Winding Test Shunt Field Winding Test PIN TAB Idler Solenoid Test Idler Solenoid Test Engine Throttle Adjustment Test Engine Throttle Adjustment Test Oscilloscope Method Frequency Counter MethodAdjusting Screw Locking NUT Description Flashing the FieldsDo not remove brush holder ProcedureHigh Idle no Load Fine Current Control Rheostat AT Maximum Scope SettingsNormal Open Circuit Voltage Waveform 115VAC Supply 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 ReplacementFuel Tank Return Line Mounting Hardware Cable Retainer Bowl Negative Output Terminal Copper Strap on Rear Side Figure F.14 Alternator Cover Removal Figure F.15 Rotor Removal Replacement Alternator Stator Removal and Replacement Alternator Stator Removal ProcedureVAC Receptacle Circuit Breaker Field Bridge Rectifier Genernator Brush HOLDER/COIL Cables Drill Spot STATOR/ENDBRACKET Mounting Bolt Generator Frame Removal and Replacement Figure F.21 Generator Lead and Cable Connections Generator Frame RemovalRope Sling ENGINE/GENERATOR Mounting Holes Generator Armature Removal and Replacement Blower Paddle PADDLE/ARMATURE Mounting Bolts Generator Armature RemovalRetest After Repair AC Auxiliary Power Receptacle OutputEngine Output Welder DC OutputElectrical Diagrams Section Classic Wiring Diagram Code Electrical DiagramsRemote Control Optional Remote Control Optional Wire Feed Module Optional Wire Feed Thermostat * Machine Must not be Running J3 Sensor Idler PC Board M13708 Schematic Idler PC Board M13708 Components Idler PC Board l9902 Schematic Idler PC Board l9902 Components

SVM125-A specifications

The Lincoln Electric SVM125-A is a versatile and highly efficient welding machine that has gained significant recognition in the welding industry. Designed for both professionals and enthusiasts, this machine combines advanced technology with user-friendly features to deliver outstanding performance in a range of welding applications.

One of the standout features of the SVM125-A is its Inverter Technology. This cutting-edge technology allows for lightweight and compact design, making the machine highly portable. The inverter technology also provides a steady arc, which is crucial for achieving clean, high-quality welds. With a duty cycle of 125 amps at a 60% duty cycle, this welding machine can handle a variety of materials and thicknesses, from thin sheet metal to heavier structural components.

The SVM125-A supports multiple welding processes, including MIG, stick, and TIG welding. This versatility makes it an ideal choice for diverse welding tasks, whether you're working in a fabrication shop, doing repair work, or engaged in hobbyist projects. The machine features easy switch functionality, allowing users to quickly shift between welding processes without complicated setup.

Another notable characteristic is the machine's user-friendly interface. The intuitive control panel includes clear indicators and knobs that allow for easy adjustments of voltage and wire feed speed. This design is especially helpful for novice welders, providing them with the confidence to make adjustments as needed and ensuring optimal weld quality.

Safety is also a priority with the SVM125-A. The machine is equipped with thermal overload protection, which automatically shuts it down in case of overheating, preventing damage to the unit and ensuring operator safety. Additionally, the machine features a robust construction that emphasizes durability, making it suitable for demanding work environments.

Portability is enhanced through its lightweight design, and the built-in carrying handle makes it easy to transport from one job site to another. The SVM125-A is also compatible with a variety of welding accessories, further increasing its adaptability and functionality.

In conclusion, the Lincoln Electric SVM125-A stands out as a well-rounded welding machine that integrates advanced technology with user-friendly features. Its versatility in welding processes, robust design, and emphasis on safety and usability make it a valuable tool for welders at all skill levels. Whether for professional use or personal projects, the SVM125-A is a reliable choice that delivers exceptional performance and quality.
Top Page Image Contents