Lincoln Electric SVM141-A Replacement Procedure, For Steps 9--17, see Figure F.15 and F.16

Page 93

Section TOC

Master TOC

F-53

F-53

TROUBLESHOOTING & REPAIR

POLARITY SWITCH REMOVAL AND REPLACEMENT (continued)

Return to

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to

Return to Master TOC

Return to Master TOC

Return to Master TOC

For Steps 9--17, see Figure F.15 and F.16.

9.With the 1/2” wrench, remove the “POS” flex lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

10.With the 1/2” wrench, remove the “B” flex lead from the polarity switch. This lead con- nects to the AC plate on the SCR bridge. See Wiring Diagram. Label lead and con- nection point for reassembly.

11.Using the 1/2” wrench, remove the “NEG” flex lead from the rear gang of the polarity switch. This lead connects to the D1 diode on the SCR bridge. See the Wiring Diagram. Label lead and connection point for reassem- bly. Also label and remove the D2 diode heat sink assembly.

12.Using the 1/2” wrench, remove the flex lead from the polarity switch. This lead connects to the high frequency transformer coil and the by-pass board. See the Wiring Diagram. Label lead and connection point for reassembly. Also remove lead #252.

13.Using the 1/2” wrench, remove the other flex lead from the polarity switch. This lead con- nects to the upper terminal on the by-pass and the “work” output terminal lead. See the Wiring Diagram. Label lead and connection point for reassembly. Also remove lead #253.

14.Using the 1/2” wrench, remove the choke lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

15.With the 1/2” wrench, remove the X1 sec- ondary lead from the polarity switch. See the Wiring Diagram. Label lead and connection point for reassembly.

16.Carefully unsolder the two leads (#275C and #312) from the microswitch located on the polarity switch assembly. See the Wiring Diagram. Label leads and connections points for reassembly.

17.Remove the cable tie that holds the thermal protection light leads to the polarity switch.

18.With the 7/16” wrench, remove the two nuts and washers that hold the polarity switch to the front panel. See Figure F.14.

19.Carefully remove the polarity switch assem- bly from the machine.

Replacement Procedure

Refer to Figures F.14 - F.16.

1.Mount the polarity switch to the front panel with two nuts and washers.

2.Replace the cable tie holding the thermal pro- tection light leads to the polarity switch.

3.Resolder leads #275C and #312 to the microswitch.

4.Attach the following leads to the polarity switch. See Figures F.15 and F.16.

•X1 secondary lead

•choke lead

•#253 and flex lead

•#252 and flex lead

•NEG lead (at rear gang)

•POS lead

•B lead

5.Install the nameplate with 7 rivets.

6.Re-install and secure the three small plastic control knobs.

7.Install the polarity switch handle with the phillips head screw.

8.Install the output control knob with the allen screw.

9.Install the case top and sides.

SQUARE WAVE TIG 275

Page 92 Page 94
Image 93
Page 92 Page 94
Contents Square Wave TIG Safety Depends on YouSquare Wave TIG SafetyElectric Shock can kill ARC Rays can burnFumes and Gases can be dangerous Iii Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Square Wave TIG InstallationSafety Precautions Figure A.1 Input Supply ConnectionsReturn to Section TOC To Section TOC Input Reconnect ProcedureOutput Connections User Supplied ConnectorsWork Cable Connection Table A.1Cylinder could explode if damaged TIG Torch ConnectionTWIST-MATE Adapter for LW-18 and LW-20 TIG Torch TWIST-MATE Adapter for LA-9 and LA-17 TIG TorchCompleted Assembly Square Wave TIG Table of Contents Operation Section Electric Shock can kill OperationFumes and Gases can be dangerous Welding Sparks can cause fire or explosionDesign Features Advantages General DescriptionRecommended Processes and Equipment Limitations Welding CapabilityFigure B.1 Control Panel Controls and SettingsTIG Welding Welding OperationTIG Welding Guidelines Twist Mate ElectrodeTIG Welding Sequence of Operation 2-Step TIG Mode Table B.2 Recommended Polarity Settings for TIG WeldingTIG Welding Sequence of Operation 4-Step TIG Mode Advanced TIG Welding Features Hand and Foot Amptrol OperationAC Wave Balance and Auto Balance Stick Welding Auxiliary PowerHertz Domestic Machines 50/60 Hertz European MachinesSquare Wave TIG Section C-1Section C-1 Table of Contents AccessoriesAccessories Included with Machine Optional AccessoriesK963-1, -2 Hand Amptrol Table of Contents Maintenance Section Maintenance Routine and Periodic MaintenanceOverload Protection Spark GAP ASSEMBLY, High Voltage Transformer Component Location and AccessControl PC Board Display PC BOARD, ARC STARTER/BYPASS PC BoardFigure D.2 Major Component Locations Table of Contents Theory of Operation Section Theory of Operation Input Power CircuitFigure E.3 Output RECTIFICATION, Control Board and Feedback Output Rectification Control Board and FeedbackFigure E.4 High Voltage / High Frequency Circuit High Voltage / High Frequency CircuitFigure E.5 DC Welding Output DC Welding OutputFigure E.7 AC Welding Output AC Welding OutputFigure E.9 SCR Operation SCR OperationProtective Circuits Thermal ProtectionOverload Protection Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairDisable Procedure High Voltage / High Frequency can damage test equipmentPC Board can be damaged by static electricity PC Board Troubleshooting ProceduresTroubleshooting Guide Observe Safety GuidelinesDetailed in the beginning of this manual Perform the SCR Bridge Test Troubleshooting & Repair Connections Troubleshooting Guide Troubleshooting & Repair TIG Welding Problems Can Kill Electric ShockTroubleshooting & Repair To Technical Specifications Stick Welding Problems 15F-15 Function ProblemsFunction Problems Installation Troubleshooting & Repair High Frequency Circuit Disable Procedure Test DescriptionMaterials Needed Procedure High Frequency Circuit Disable ProcedureT1 Main Transformer Test T1 Main Transformer Test Test ProcedureReplace the case side covers Primary WINDINGS1 Test PointsGAS Water Solenoid Test Figure F.3 GAS Solenoid Location GAS Water Solenoid TestStatic SCR Test Figure F.4 Plug J1 Location on Control Board Static SCR TestAssembly Removal and Replacement Description Active SCR TestFigure F.6 Plug J1 Location on Control Board Active SCR TestFigure F.7 Active SCR Test Setup SCR Bridge Assembly Removal and Replacement AC TIG Mode Scope SettingsNormal Open Circuit Voltage Waveform DC TIG Mode AC Stick Mode DC Stick Mode Typical Output Voltage Waveform Machine Loaded Machine Loaded to 255 AmpsAT 30 VAC AT 31 VDC Machine Loaded to 275 AmpsAC Stick Mode DC Stick Mode 50 V/Div High Voltage Transformer Removal Replacement Replacement Removal ProcedureHigh Voltage Transformer Removal Figure F.10 High Voltage Transformer Mounting Insulators Replacement ProcedureSCR Bridge Assembly Removal and Replacement Using the 3/8 nut driver, remove the case SCR Bridge Assembly Removal and ReplacementFigure F.13 SCR Bridge Connections Refer to Figures F.11 F.13 Polarity Switch Removal and Replacement Allen Screw Control Knobs Polarity Switch Handle Polarity Switch Removal and Replacement253 POS Micro Switch Leads Square Wave TIGFigure F.16 Polarity Switch Wiring Diagram For Steps 9--17, see Figure F.15 and F.16 Replacement ProcedureDescription Removal and Replacement Main Transformer and Output Choke AssemblyFigure F.18 Transformer Connections POS Micro Switch Leads Figure F.19 Polarity Switch Connections Choke NEGRefer to Figures F.17 F.19 Reassembly ProcedureRetest After Repair Minimum Acceptable Output Voltage AT Maximum Output SettingInput Idle Amps Open Circuit VoltagesSquare Wave TIG Section G Diagram L10747 WiringElectrical TIGSquarewave Diagram L10747-2Control Board Schematic G3358-1 Electrical DiagramsOCI4 TRI3 MT2 Control Board Schematic G3358-2Return to Section Return to Section TOC To Section TOC Display Board Schematic L10768Bypass L10770-17-24-98 Display Board Layout L10770-1XXX 10G-10 Bypass Board Layout L10121-1Square 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.
Top Page Image Contents