Lincoln Electric SVM186-A service manual Troubleshooting and Repair

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F-10

TROUBLESHOOTING AND REPAIR

F-10

 

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

(SYMPTOMS)

 

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

Black areas along weld bead.

1.

Clean any oily or organic conta-

1.

This may be a welding proce-

 

 

 

mination from the work piece.

 

dure problem.

 

 

 

2.

Tungsten electrode may be con-

Contact The Lincoln Electric

 

 

 

 

taminated. Replace or sharpen.

Service Department, 1-888-935-

 

 

 

 

3877.

 

 

 

3. Check for contaminated gas or

 

 

 

 

 

 

leaks in the gas line, torch, or

 

 

 

 

 

 

associated connections.

 

 

 

 

 

4. The gas shielding may be insuf-

 

 

 

 

 

 

ficient. Increase gas flow:

 

 

 

 

 

 

reduce tungsten stickout beyond

 

 

 

 

 

 

the gas cup.

 

 

 

 

 

 

 

 

 

Weak high frequency - machine

1.

Check for loose or faulty con-

1.

Make sure that 115VAC is

 

has normal welding.

 

 

nections at the torch and/or

 

being applied to the primary of

 

 

 

welding cables.

 

the high voltage transformer

 

 

 

 

 

 

(T3). See wiring diagram.

 

 

 

2. The gas shielding may be insuf-

 

 

 

 

 

 

ficient. Increase gas flow:

2.

Check for any open or arcing

 

 

 

reduce tungsten stickout beyond

 

high frequency component.

 

 

 

 

the gas cup.

 

Replace as required.

 

 

 

 

 

 

(Examples: C3, R3, C4)

 

 

 

3. Check spark gap operation and

 

 

 

 

 

 

setting. Normal is (0.015").

 

 

 

 

 

 

Refer to Maintenance section of

3.

If spark is weak at the spark

 

 

 

 

this manual.

 

gap, check or replace the high

 

 

 

 

 

frequency circuit.

 

 

 

4.

The work and electrode cables

 

(Examples: T3, L3, L4).

 

 

 

 

may be in poor condition allow-

 

 

 

 

 

 

ing the high frequency to "leak

 

 

 

 

 

 

off". Use good quality cables

 

 

 

 

 

 

with a high natural rubber con-

 

 

 

 

 

 

tent, such as Lincoln Stable Arc

 

 

 

 

 

 

Cable. Cables should be as

 

 

 

 

 

 

short as possible.

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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 PlatePulse TIG Control Welding in TIG ModeOperating Steps Operation Welding in Stick Mode Turn the power switch to onPrecision TIG Table of Contents Accessories Section Table C.1 AccessoriesStandard Equipment Packages 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 General Description Input Power CircuitTheory of Operation 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 Recommended Course of Action Problems SymptomsPossible Areas Misadjustments 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 Materials Needed High Frequency Circuit Disable ProcedureTest Description 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 Machine Loaded to 180 Amps AT 16VDC AC TIG ModeTypical Output Voltage Waveform Machine Loaded 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 Recommended Meters for Machine Output Tests Retest After RepairInput Idle Amps 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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