Lincoln Electric SVM125-A service manual Excitation Flashing, Auxiliary and Field Feedback Coils

Page 47

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E-3

E-3

THEORY OF OPERATION

FIGURE E.3 – ENGINE, GENERATOR ARMATURE AND FRAME, ALTERNATOR STATOR AND ROTOR

 

ON LATER MODELS

 

 

 

 

 

 

 

 

 

PROTECTION AND IDLER CIRCUITS

 

 

 

 

 

 

 

 

 

ARE ON ONE PC BOARD

 

 

 

 

 

 

 

 

 

PROTECTION

 

 

 

SELECTOR

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

REED

 

 

 

 

IDLER

 

 

 

 

 

RELAY

NEGATIVE

 

 

BOARD

 

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

115 & 230VAC

 

 

 

 

 

 

 

 

 

 

RECEPTACLES

 

 

 

 

IDLER

 

 

 

 

 

 

 

 

 

SOLENOID

 

 

 

 

 

 

 

 

OIL

OIL

 

 

GENERATOR

 

 

 

 

 

TEMPERATURE

PRESSURE

 

 

 

FRAME

 

 

 

 

 

SENSOR

SENSOR

 

 

 

 

 

CURRENT

 

 

FUEL

 

 

SERIES

 

 

 

 

 

 

SOLENOID

 

 

COILS

 

 

 

 

TRANSFORMER

 

 

RELAY

 

 

 

 

 

 

ALTERNATOR

STATOR

 

 

CR1

 

 

 

 

BRUSHES & COMMUTATOR

 

 

SWITCH

ENGINE

 

 

ARMATURE

 

 

SLIP

 

 

(NOT PRESENT

ENGINE

MECHANICAL

GENERATOR

 

ARMATURE

ROTOR

 

 

 

ON LATER MODELS)

 

 

 

 

 

 

 

 

 

IGNITION

 

 

COUPLING

 

 

 

SHAFT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALTERNATOR

 

 

 

 

 

 

 

RINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERPOLE

 

 

 

 

 

 

 

 

 

COILS

RESIDUAL

 

 

 

 

 

 

STARTER

 

 

MAGNETISM

FLASHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

 

 

FIELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHUNT

 

 

 

 

 

 

 

 

 

WINDINGS

 

 

 

 

 

 

 

 

 

 

 

 

FIELD

 

 

 

BATTERY

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

GENERATOR

 

 

 

 

 

 

 

 

 

FIELD CONTROL

 

 

POSITIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

TERMINAL

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ENGINE, GENERATOR ARMATURE AND FRAME, ALTERNATOR STATOR AND ROTOR

EXCITATION (FLASHING)

When the engine is started and running, the residual magnetism voltage is applied to the alternator rotor via a brush and slip ring configuration. This excitation (“flashing”) voltage magnetizes the rotor lamination. The alternator rotor is connected to the armature shaft, which is mechanically coupled to the engine. The rotat- ing magnet (rotor) induces a voltage in the stationary windings of the alternator stator.

AUXILIARY AND FIELD FEEDBACK COILS

There are two isolated windings incorporated in the sta- tor lamination assembly. One of these windings is tapped and provides 115VAC and 230VAC of auxiliary power to the appropriate receptacles. The other 115VAC isolated winding is rectified to a DC voltage and is used to supply field feedback voltage to the

rotor. It also supplies voltage, through the generator field rheostat control, to the field shunt windings in the main generator frame.

INTERPOLE AND SERIES COILS

The generator armature rotates within the magnetic field created by the shunt field windings. A DC voltage is induced in the armature and is transferred, through the armature commutator and brushes, to the series and interpole coils. The interpole coils, which are con- nected in series with the positive output terminal, are located so as to counteract any magnetic influences that could cause mechanical distortion in the rotating armature. The series coils are designed to oppose or “buck” the DC voltage that is generated in the arma- ture.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

CLASSIC II

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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 General Description Safety InstructionsOperation Operating InstructionsWelder Operational Features and ControlsDesign Features Recommended ApplicationsLimitations Welding CapabilityWELDER/GENERATOR Controls Controls and SettingsFigure B.2 Current Controls Control of Welding CurrentReturn to Diesel Engine ControlsCheck and fill the engine fuel tank Engine OperationBefore Starting the Engine Starting the EngineBREAK-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 Every 50 Hours Daily or BeforeStarting Engine First 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 RemovalWelder DC Output AC Auxiliary Power Receptacle OutputRetest After Repair Engine 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.