Lincoln Electric SVM169-A Problems Possible Areas Recommended Symptoms, Course of Action

Page 42

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F-4

TROUBLESHOOTING & REPAIR

F-4

TROUBLESHOOTING GUIDE

 

 

 

Observe Safety Guidelines

 

 

 

detailed in the beginning of this manual.

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

(SYMPTOMS)

 

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

 

Machine is dead. No output - No

1.

Make sure that the input power

1.

Check the input power switch

 

fan

 

 

switch is in the "ON" position and

 

and associated wires for loose or

 

 

 

 

the machine is plugged in.

 

faulty connections.

 

 

 

 

2.

Check the input voltage at the

2.

Perform the T1 Transformer

 

 

 

 

machine. Input voltage must

 

Test.

 

 

 

 

 

match the rating plate and volt-

 

 

 

 

 

 

 

age connection. Refer to

 

 

 

 

 

 

 

Reconnect Procedure in the

 

 

 

 

 

 

 

Installation section of this manu-

 

 

 

 

 

 

 

al.

 

 

 

 

 

 

3. Blown or missing fuses in the

 

 

 

 

 

 

 

input line.

 

 

 

 

 

 

 

 

 

 

The fan runs normally. No output

1.

Check for proper input voltages

1.

Check for loose or faulty connec-

 

from the machine in either Stick or

 

per nameplate and voltage

 

tions on the heavy current carry-

 

TIG modes.

 

 

reconnect configuration.

 

ing leads. (polarity switch, output

 

 

 

 

 

 

choke output terminals etc.)

 

 

 

2. Check to make sure the polarity

 

 

 

 

 

 

 

switch is in the proper position

2.

Perform the T1 Transformer

 

 

 

 

and functioning correctly.

 

Test.

 

 

 

 

 

 

3.

Perform the SCR Bridge Test.

 

 

 

 

 

4.

Check current control R1 for

 

 

 

 

 

 

proper operation. Normal resis-

 

 

 

 

 

 

tance is 10,000 ohms. Also

 

 

 

 

 

 

check associated leads

for loose

 

 

 

 

 

 

or faulty connections.

 

 

 

 

 

 

5.

The control board may be faulty.

 

 

 

 

 

 

Replace.

 

 

 

 

 

 

 

 

 

 

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 1-888-935-3877.

PRECISION TIG 185

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Contents Precision TIG Safety Electric Shock can kill Safety Welding Sparks can cause fire or explosionPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionInstallation Input Single Phase onlyModel Height Width Depth Weight K2345-2 Input at Rated OutputSafety Precautions Select Suitable LocationInput Connections Connections for TIG Gtaw Welding Input Reconnect ProcedureOutput Connections TIG Torch ConnectionRemote Control Connection Work Cable ConnectionShielding GAS Connection Precision TIG Operation Section Section BOperation Product Description Recommended Processes and EquipmentControls and Settings Control FunctionalityWelding in TIG Mode Operating StepsPulse TIG Control Remote Control Operation Benefits of the Precision TIG 185 DesignWelding in Stick Mode Recommended Electrode Amperage Ranges Precision TIGPrecision TIG Accessories Section Accessories Factory Installed OptionsTable C.1 Field Installed Options K2348-1 Under-Storage CartPrecision TIG Maintenance Section Section DMaintenance Routine and Periodic MaintenanceSpark GAP Adjustment Figure D.2 Location of Maintenance Components Return to Section TOC Theory of Operation Section Section EInput Power Circuit Theory of OperationGeneral Description Output Rectification Feedback Control Figure E.3 Control Board and Output Feedback ControlHigh Voltage / High Frequency Circuit Figure E.4 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 OperationProtective Circuits Thermal ProtectionOverload Protection Troubleshooting & Repair Section Section FTroubleshooting & Repair High Voltage / High Frequency can damage test equipmentPC Board Troubleshooting Procedures WorkstationsProblems Possible Areas Recommended Symptoms Course of ActionPossible Areas Recommended Symptoms Problems Possible Areas Check the welding cables and or TIG Mode Problems Troubleshooting & Repair TIG Welding Problems Problems Possible Areas Electric Shock can Problems Possible Areas Recommended Symptoms Stick Welding Problems High Frequency Circuit Disable Procedure Test DescriptionProcedure Figure F.1 Spark GAP AssemblyT1 Transformer Test Test Procedure T1 Transformer TestReturn to Section Section TOC Primary Windings Primary VoltagesPrecision TIG Static SCR Test Static SCR Test Assembly Removal and Replacement Precision TIG Active SCR Test Active SCR Test Figure F.6 SCR Gate Locations Precision TIG 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 180 Amps AT 16VDCDC TIG Mode Machine Loaded to 180 Amps AT 26VDC DC Stick Mode 50 V/Div Precision TIG Troubleshooting and Repair SCR Bridge Assembly Removal and Replacement ProcedureSCR Bridge Assembly ProcedureFront Panel Mounting Screws 42TROUBLESHOOTING & REPAIRF-42 Figure F.9 Plug J2 on Control Board43TROUBLESHOOTING & REPAIRF-43 Replacement ProcedurePrecision 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 Leads Precision TIGFigure F.12 High Voltage Transformer Mounting Insulators Precision TIG Nutdriver Wrench Wire cutters Perform the SCR Bridge Assembly Removal Procedure Assembly Replacement Procedure Precision TIG Input Idle Amps Troubleshooting and RepairRetest After Repair Recommended Meters for Machine Output TestsPrecision TIG Electrical Diagrams Section Wiring Diagram Entire Machine G4549 Precision TIGSchematic Entire Machine G4588 G4588Schematic Control PC Board G4550-1B4-1 Schematic Control P.C. Board G4550-1B4-2 Schematic Control P.C. Board G4550-1B4-3 PC Board Assembly Control G4551-1 G4551SVM Error Reporting Form
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