Lincoln Electric SVM186-A service manual Perform the SCR Bridge Test

Page 47

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-7

TROUBLESHOOTING AND REPAIR

F-7

 

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

(SYMPTOMS)

 

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

Machine welds at a very low out-

1.

If welding in the TIG mode the

1.

Check the polarity switch and

 

put regardless of the current con-

 

remote control device may be

 

associated leads.

 

trol setting.

 

 

defective.

 

 

 

 

 

 

 

2. Check the interior connections

 

 

2.

Make certain the input line volt-

 

of the heavy current carrying

 

 

 

 

age is correct for the machine

 

leads.

 

 

 

 

reconnect configuration.

3. Perform the SCR Bridge Test.

 

 

 

 

 

 

3. Check the welding cables and or

 

Perform the T1 Transformer

 

 

 

 

torch for loose or faulty connec-

4.

 

 

 

 

tions.

 

Test.

 

 

 

 

 

5. Check the current control for

 

 

 

 

 

 

proper operation. Normal

 

 

 

 

 

 

resistance is 10k ohms. See

 

 

 

 

 

 

wiring diagram.

 

 

 

 

 

6. The control board may be

 

 

 

 

 

 

faulty.

 

 

 

 

 

 

The machine welds at a very high

1.

If welding in the TIG mode the

1.

Perform the SCR Bridge Test.

output regardless of the current

 

remote control device may be

2.

Perform the T1 Transformer

 

control setting.

 

 

defective.

 

 

 

 

 

 

Test.

 

 

 

 

 

3. Check the current control for

 

 

 

 

 

 

proper operation. Normal

 

 

 

 

 

 

resistance is 10k ohms. See

 

 

 

 

 

 

wiring diagram.

 

 

 

 

 

4. The control board may be

 

 

 

 

 

 

faulty.

 

 

 

 

 

 

 

 

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

Page 46 Page 48
Image 47
Page 46 Page 48
Contents Precision TIG ISAFETYi Fumes and Gases SafetyFor Electrically Powered equipmentSûreté Pour Soudage a LʼArc Précautions DE SûretéElectromagnetic Compatibility EMC Safety Master Table of Contents for ALL Sections Table of Contents Installation Section Input Single Phase only InstallationK2533-2 Input at Rated Output Model Height Width Depth WeightTilting Safety PrecautionsSelect Suitable Location Mounting Lifting and MovingInput and Grounding Connections Return Section TOC Input Reconnect ProcedureConnections for Stick Smaw Welding Connections for TIG Gtaw WeldingPrecision TIG Table of Contents Operation Section Operation Recommended Processes and EQUIP- Ment Product DescriptionControl Functionality Figure B.1 Control PanelPOWER-UP Sequence Machine Rating Plate Case Rear ComponentsPulse TIG Control Welding in TIG ModeOperating Steps Operation Turn the power switch to on Welding in Stick ModePrecision TIG Table of Contents Accessories Section Table C.1 AccessoriesStandard Equipment Packages Table C.2 Factory Installed OptionsK2348-1 Under-Storage Cart Field Installed OptionsTable of Contents Maintenance Section Spark GAP Adjustment MaintenanceSafety Precautions Routine and Periodic Maintenance1TABLE of CONTENTS-THEORY of Operation Section E-1 General Description Input Power CircuitTheory of Operation Protected Output Rectification Feedback ControlFigure E.2 High Voltage/High Frequency Circuit High Voltage / High Frequency CircuitFigure E.5 DC Welding Current Generation DC Welding OutputFigure E.6 AC Square Wave Welding Current Generation AC Welding OutputFigure E.7 SCR Operation SCR OperationVAC Receptacle Protective CircuitsThermal Protection Overload Protection1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide Troubleshooting and RepairWorkstations PC Board Troubleshooting ProceduresPerform 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 Figure F.1 Spark GAP Assembly ProcedureT1 Transformer Test T1 Transformer Test Primary Windings Primary Voltages Precision TIG Static SCR Test Precision TIG 225 Control Test ProcedureCase Cover Removal and Replacement Procedure Precision TIG Active SCR Test Active SCR Test Figure F.6 SCR Gate Locations Precision TIG Scope Settings Normal Open Circuit Voltage Waveform AC TIG ModeNormal 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 Machine Loaded to 180 Amps AT 26VDC AC Stick ModeDC Stick Mode Troubleshooting and Repair Precision TIG SCR Bridge Assembly Removal and Replacement Procedure Figure F.7 Case Back Mounting Screws SCR Bridge AssemblyProcedure Plug J2 Removed Replacement Procedure Precision TIG Polarity Switch Removal and Replacement Procedure Removal Procedure Polarity SwitchReplacement Procedure Precision TIG High Voltage Transformer Removal and Replacement Procedure Transformer Secondary Leads High Voltage TransformerFigure 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.
Top Page Image Contents