Lincoln Electric SVM141-A service manual Troubleshooting & Repair

Page 46

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F-6

 

 

F-6

 

TROUBLESHOOTING & REPAIR

 

 

Observe Safety Guidelines

 

 

TROUBLESHOOTING GUIDE

 

detailed in the beginning of this manual.

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

No output from the machine in

1. The welding application may

1. One of the thermostats may be

 

either Stick or TIG modes. The

 

have exceeded the recom-

faulty. Check or replace. See

 

thermal light is on.

 

mended duty cycle. Allow the

the Wiring Diagram.

 

 

 

fan to cool the unit until the ther-

2. Check for loose or faulty wires

 

 

 

mal light is off.

 

 

 

on the thermostats and associ-

 

 

 

 

 

 

2. The air louvers may be blocked.

ated circuitry. See the Wiring

 

 

 

Remove the air obstruction and

Diagram.

 

 

 

allow the unit to cool.

3. The fan motor may be faulty or

 

 

 

 

 

 

 

 

mechanically obstructed. The

 

 

 

 

fan should run when welding or

 

 

 

 

when a thermostat is open.

 

 

 

 

4. The control board may be faulty.

 

 

 

 

 

 

The machine does not respond (no

1.

Make certain the machine is in

1. Check the continuity (zero

 

gas flow, no high frequency and no

 

the TIG mode.

ohms) of the leads between the

 

open circuit voltage) when the arc

2.

The Amptrol or arc start switch

remote receptacle and plug J7

 

start switch or Amptrol is activated.

on the control board. See the

 

 

may be defective. Check for

 

The thermal light is not lit.

 

Wiring Diagram.

 

 

continuity (zero ohms) between

 

 

 

 

 

 

 

 

pins “D” and “E” on the cable2. Perform the T1 Transformer

 

 

 

connector when the Amptrol or

Test.

 

 

 

arc start switch is pressed.

3. The control board may be faulty.

 

 

 

 

 

 

 

 

 

 

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.

SQUARE WAVE TIG 275

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Contents Safety Depends on You Square Wave TIGSafety Square Wave TIGARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Cylinder may explode if damaged IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Square Wave TIGSafety Precautions Input Supply Connections Figure A.1Input Reconnect Procedure Return to Section TOC To Section TOCWork Cable Connection User Supplied ConnectorsOutput Connections Table A.1TIG Torch Connection Cylinder could explode if damagedTWIST-MATE Adapter for LA-9 and LA-17 TIG Torch TWIST-MATE Adapter for LW-18 and LW-20 TIG TorchCompleted Assembly Square Wave TIG Table of Contents Operation Section Fumes and Gases can be dangerous OperationElectric Shock can kill Welding Sparks can cause fire or explosionGeneral Description Design Features AdvantagesRecommended Processes and Equipment Welding Capability LimitationsControls and Settings Figure B.1 Control PanelTIG Welding Guidelines Welding OperationTIG Welding Twist Mate ElectrodeTable B.2 Recommended Polarity Settings for TIG Welding TIG Welding Sequence of Operation 2-Step TIG ModeTIG Welding Sequence of Operation 4-Step TIG Mode Hand and Foot Amptrol Operation Advanced TIG Welding FeaturesAC Wave Balance and Auto Balance Hertz Domestic Machines Auxiliary PowerStick Welding 50/60 Hertz European MachinesSquare Wave TIG Table of Contents Accessories Section C-1Section C-1Optional Accessories Accessories Included with MachineK963-1, -2 Hand Amptrol Table of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceOverload Protection Control PC Board Component Location and AccessSpark GAP ASSEMBLY, High Voltage Transformer Display PC BOARD, ARC STARTER/BYPASS PC BoardFigure D.2 Major Component Locations Table of Contents Theory of Operation Section Input Power Circuit Theory of OperationOutput Rectification Control Board and Feedback Figure E.3 Output RECTIFICATION, Control Board and FeedbackHigh Voltage / High Frequency Circuit Figure E.4 High Voltage / High Frequency CircuitDC Welding Output Figure E.5 DC Welding OutputAC Welding Output Figure E.7 AC Welding OutputSCR Operation Figure E.9 SCR OperationThermal Protection Protective CircuitsOverload Protection Table of Contents Troubleshooting & Repair Section Disable Procedure Troubleshooting & RepairHOW to USE Troubleshooting Guide High Voltage / High Frequency can damage test equipmentPC Board Troubleshooting Procedures PC Board can be damaged by static electricityObserve Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Perform the SCR Bridge Test Troubleshooting & Repair Connections Troubleshooting Guide Troubleshooting & Repair TIG Welding Problems Electric Shock Can KillTroubleshooting & Repair To Technical Specifications Stick Welding Problems Function Problems 15F-15Function Problems Installation Troubleshooting & Repair Test Description High Frequency Circuit Disable ProcedureMaterials Needed High Frequency Circuit Disable Procedure ProcedureT1 Main Transformer Test Test Procedure T1 Main Transformer TestReplace the case side covers Test Points Primary WINDINGS1GAS Water Solenoid Test GAS Water Solenoid Test Figure F.3 GAS Solenoid LocationStatic SCR Test Static SCR Test Figure F.4 Plug J1 Location on Control BoardAssembly Removal and Replacement Active SCR Test DescriptionActive SCR Test Figure F.6 Plug J1 Location on Control BoardFigure F.7 Active SCR Test Setup SCR Bridge Assembly Removal and Replacement Scope Settings AC TIG ModeNormal Open Circuit Voltage Waveform DC TIG Mode AC Stick Mode DC Stick Mode Machine Loaded to 255 Amps Typical Output Voltage Waveform Machine LoadedAT 30 VAC Machine Loaded to 275 Amps AT 31 VDCAC Stick Mode DC Stick Mode 50 V/Div High Voltage Transformer Removal Replacement Removal Procedure ReplacementHigh Voltage Transformer Removal Replacement Procedure Figure F.10 High Voltage Transformer Mounting InsulatorsSCR Bridge Assembly Removal and Replacement SCR Bridge Assembly Removal and Replacement Using the 3/8 nut driver, remove the caseFigure F.13 SCR Bridge Connections Refer to Figures F.11 F.13 Polarity Switch Removal and Replacement Polarity Switch Removal and Replacement Allen Screw Control Knobs Polarity Switch HandlePOS Micro Switch Leads Square Wave TIG 253Figure F.16 Polarity Switch Wiring Diagram Replacement Procedure For Steps 9--17, see Figure F.15 and F.16Description Main Transformer and Output Choke Assembly Removal and ReplacementFigure F.18 Transformer Connections Figure F.19 Polarity Switch Connections Choke NEG POS Micro Switch LeadsReassembly Procedure Refer to Figures F.17 F.19Input Idle Amps Minimum Acceptable Output Voltage AT Maximum Output SettingRetest After Repair Open Circuit VoltagesSquare Wave TIG Section G Electrical WiringDiagram L10747 TIGDiagram L10747-2 SquarewaveElectrical Diagrams Control Board Schematic G3358-1Control Board Schematic G3358-2 OCI4 TRI3 MT2Display Board Schematic L10768 Return to Section Return to Section TOC To Section TOCBypass Display Board Layout L10770-1 L10770-17-24-98XXX Bypass Board Layout L10121-1 10G-10Square Wave TIG

SVM141-A specifications

The Lincoln Electric SVM141-A is a cutting-edge solution designed for operators requiring precision, efficiency, and versatility in their welding applications. This machine is known for its compact form but robust feature set, making it an ideal choice for both professional welders and industrial applications.

One of the standout features of the SVM141-A is its advanced inverter technology. This innovation allows for a stable arc, providing consistent results even under varying conditions. The machine minimizes power consumption, making it energy-efficient without compromising performance. The inverter technology also supports a wider input voltage range, making the SVM141-A suitable for use in diverse environments and job sites.

Another key characteristic is its multi-process capability. The SVM141-A supports MIG, stick, and TIG welding processes, providing flexibility for various welding tasks. This versatility enables operators to tackle different materials, including mild steel, stainless steel, and aluminum, making it a valuable tool for numerous projects.

The user-friendly interface of the SVM141-A includes an intuitive digital display, which allows welders to adjust settings with ease. This feature is crucial for ensuring the right configurations for specific welding tasks, reducing the chances of errors and enhancing the overall finish of welds.

Safety is also a priority with the Lincoln Electric SVM141-A. It comes with built-in safety features such as overheat protection and automatic shutdown, ensuring operator safety and equipment longevity. The machine's lightweight design enhances portability, allowing it to be used in various workspaces with ease.

Durability is another hallmark of the SVM141-A. Constructed with high-quality materials, the machine is designed to withstand the rigors of demanding work environments. This ensures reliability over time, providing consistent performance even under heavy use.

In summary, the Lincoln Electric SVM141-A is a versatile, efficient, and user-friendly welding machine that appeals to a wide range of users. Its advanced inverter technology, multi-process capabilities, safety features, and durable construction make it a strong contender in the welding market, suitable for both professionals and hobbyists alike. Whether it’s for light fabrication, repairs, or industrial welding tasks, the SVM141-A meets diverse needs with precision and reliability.
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