Lincoln Electric SVM186-A service manual Perform the SCR Bridge Assembly Replacement Procedure

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Section TOC

Master TOC

F-54F-54

TROUBLESHOOTING AND REPAIR

MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE (continued)

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REMOVAL PROCEDURE

1.Remove input power to the TIG 225 machine.

2.Perform the SCR Bridge Assembly Removal

Procedure.

3.Unsolder the two 115VAC leads and leads B231 and B232 from the main transformer leads. Label leads for reassembly. See wiring diagram.

4.Unsolder leads W201 and W204 from the main transformer leads. Label leads for reassembly. See wiring diagram.

5.Unsolder leads R209 and U210 from the main transformer leads. Label leads for reassembly. See wiring diagram.

6.Using the 1/2” wrench remove the shunt assembly from the choke lead.

7.With the 3/8” wrench remove the H1, H2 or H3 lead from the input power switch. See wiring diagram. Label the leads and connection points for reassembly. Cut any necessary cable ties.

8.Remove plug J3 from the control board and push through the interior divider panel.

9.Using the 1/2” wrench remove the choke lead from the polarity switch. See wiring diagram. Label lead and connection point for reassembly.

10.With the 1/2” wrench remove the X1 sec- ondary lead from the polarity switch. See wiring diagram. Label lead and connection point for reassembly.

11.With the 1/2” wrench remove the four nuts and lock washers from the transformer mounting bolts at the base of the machine.

12.Carefully hoist the transformer/ choke assem- bly clear of the base. Clear all leads.

REPLACEMENT PROCEDURE

1.Position the new transformer/choke assembly onto the base and mounting bolts.

2.Assemble the four nuts and washers to the mounting bolts on the base of the machine.

3.Assemble the X1 secondary lead to the polarity switch.

4.Assemble the choke lead to the polarity switch.

5.Install the J3 plug into the control board.

6.Assemble the H1, H2 or H3 lead onto the input power switch. Insulate and secure the unused lead (H2 or H3).

7.Assemble the shunt assembly to the choke lead.

8.Solder leads R209 and U210 to the main trans- former leads. See wiring diagram. Insulate connections.

9.Solder leads W201 and W204 to the main transformer leads. See wiring diagram. Insulate connections.

10.Solder the two 115VAC leads and leads B231 and B232 to the main transformer leads. See wiring diagram. Insulate connections.

11.Replace any previously removed cable ties. Clear leads and check for “shorts” or “grounds”.

12.Perform the SCR Bridge Assembly

Replacement Procedure.

PRECISION TIG® 225

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Contents Precision TIG ISAFETYi Safety Fumes and GasesPowered equipment For ElectricallyPrécautions DE Sûreté Sûreté Pour Soudage a LʼArcElectromagnetic Compatibility EMC Safety Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Input Single Phase onlyModel Height Width Depth Weight K2533-2 Input at Rated OutputLifting and Moving Safety PrecautionsSelect Suitable Location Mounting TiltingInput and Grounding Connections Input Reconnect Procedure Return Section TOCConnections for TIG Gtaw Welding Connections for Stick Smaw WeldingPrecision TIG Table of Contents Operation Section Operation Product Description Recommended Processes and EQUIP- MentFigure B.1 Control Panel Control FunctionalityPOWER-UP Sequence Case Rear Components Machine Rating PlateOperating Steps Welding in TIG ModePulse TIG Control Operation Welding in Stick Mode Turn the power switch to onPrecision TIG Table of Contents Accessories Section Standard Equipment Packages AccessoriesTable C.1 Factory Installed Options Table C.2Field Installed Options K2348-1 Under-Storage CartTable of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceSafety Precautions Spark GAP Adjustment1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation Input Power CircuitGeneral Description Output Rectification Feedback Control ProtectedHigh Voltage / High Frequency Circuit Figure E.2 High Voltage/High Frequency CircuitDC Welding Output Figure E.5 DC Welding Current GenerationAC Welding Output Figure E.6 AC Square Wave Welding Current GenerationSCR Operation Figure E.7 SCR OperationOverload Protection Protective CircuitsThermal Protection VAC Receptacle1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures WorkstationsPerform the T1 Transformer Amptrol is depressed Troubleshooting and Repair Perform the SCR Bridge Test Possible Areas Misadjustments Problems SymptomsRecommended Course of Action Troubleshooting and Repair Troubleshooting and Repair Problems Symptoms Electric Shock can Perform the SCR Bridge Test Stick electrode Blasts Off when Weld current may be set too Test Description High Frequency Circuit Disable ProcedureMaterials Needed Procedure Figure F.1 Spark GAP AssemblyT1 Transformer Test T1 Transformer Test Primary Windings Primary Voltages Precision TIG Static SCR Test Test Procedure Precision TIG 225 ControlCase Cover Removal and Replacement Procedure Precision TIG Active SCR Test Active SCR Test Figure F.6 SCR Gate Locations Precision TIG Normal Open Circuit Voltage Waveform AC TIG Mode Scope SettingsNormal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC Stick Mode Typical Output Voltage Waveform Machine Loaded AC TIG ModeMachine Loaded to 180 Amps AT 16VDC DC TIG Mode AC Stick Mode Machine Loaded to 180 Amps AT 26VDCDC Stick Mode Troubleshooting and Repair Precision TIG SCR Bridge Assembly Removal and Replacement Procedure SCR Bridge Assembly Figure F.7 Case Back Mounting ScrewsProcedure Plug J2 Removed Replacement Procedure Precision TIG Polarity Switch Removal and Replacement Procedure Polarity Switch Removal ProcedureReplacement Procedure Precision TIG High Voltage Transformer Removal and Replacement Procedure High Voltage Transformer Transformer Secondary LeadsFigure F.12 High Voltage Transformer Mounting Insulators Precision TIG 53F-53 Perform the SCR Bridge Assembly Replacement Procedure Input Idle Amps Retest After RepairRecommended Meters for Machine Output Tests Precision TIG Table of Contents Diagram Section Electrical Diagrams Schematic Complete Machine ALL Codes G5647 Schematic Control PC Board #1 G5640 Schematic Control PC Board #2 G5640 Schematic Control PC Board #3 G5640 PC Board Assembly Control #1 G5641 PC Board Assembly Control #2 G5641 1B0-S22530 PC Board Assembly Bypass L10121

SVM186-A specifications

The Lincoln Electric SVM186-A is a versatile and highly efficient welding machine that stands out in the competitive landscape of industrial welding equipment. Designed to meet the needs of both professionals and hobbyists, this machine combines advanced technology with robust construction, delivering outstanding performance in various welding applications.

One of the standout features of the SVM186-A is its multi-process capability. This welding machine can handle MIG, TIG, and Stick welding processes, making it suitable for a diverse range of projects, from light fabrication to heavy-duty work. This flexibility reduces the need for multiple machines, saving time and space for users who require versatility in their welding operations.

The SVM186-A is powered by a reliable and durable inverter technology, which ensures a stable arc and efficient operation across different materials, including stainless steel, aluminum, and mild steel. This inverter technology not only enhances performance but also reduces energy consumption, making it an environmentally friendly choice.

Another notable characteristic of the SVM186-A is its user-friendly interface. The digital display provides real-time information on voltage and wire feed speed, allowing welders to easily adjust settings for optimal results. This intuitive control panel design makes it accessible for both novice welders and seasoned professionals who value precision.

The machine is also built with safety features in mind. It comes equipped with overcurrent protection and thermal overload protection to prevent damage during operation. This ensures that users can work confidently, knowing that the equipment is designed to handle demanding tasks while prioritizing safety.

Portability is another advantage of the SVM186-A. Weighing in at a relatively light weight compared to other industrial welders, this machine is designed for ease of transport. Whether working on-site or in a workshop, welders can easily move the equipment as needed.

In summary, the Lincoln Electric SVM186-A is a sophisticated welding machine that merges technology and practicality. Its multi-process capability, inverter technology, user-friendly interface, safety features, and portability make it a top choice for those seeking dependable and efficient welding solutions. Whether for professional fabrication or personal projects, the SVM186-A is equipped to handle the demands of modern welding tasks with exceptional ease and effectiveness.
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