Lincoln Electric SVM155-A service manual Technical Specifications, Main Transformer Test

Page 35

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F-7

 

 

F-7

 

TROUBLESHOOTING & REPAIR

 

 

TROUBLESHOOTING GUIDE

 

 

Observe Safety Guidelines

 

 

 

detailed in the beginning of this manual.

 

 

 

 

 

 

OUTPUT PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

 

The amber thermal light is lit. The

1.

The machine is being over-

 

 

 

 

machine does not have welding

 

loaded and thus overheated.

 

 

 

 

output, the fan runs and the digital

 

Reduce the load to conform to

 

 

 

 

output display reads a value

 

the rated output limits of the

 

 

 

 

greater than 100.

 

Multi-Source machine. See

 

 

 

 

 

 

the Technical Specifications.

 

 

 

 

 

 

 

 

 

 

The amber thermal light is lit. The

1.

The machine may be internally

1. The secondary lead thermostat

 

machine does not have welding

 

clogged with dirt and dust.

or SCR heat sink thermostat

 

output, and the fan runs. The dig-

 

Clean the machine with clean

may be faulty. Check and

 

ital output display reads a value

 

dry compressed air.

replace if necessary. These

 

greater than 100.

2. The cooling vents may be

are normally closed devices.

 

 

Also check associated leads

 

 

 

obstructed or blocked.

 

 

 

for loose or faulty connections.

 

 

 

 

 

 

3.

The ambient cooling air may

See the Wiring diagram.

 

 

 

be too hot.

2. The control board may be

 

 

 

 

 

 

 

 

faulty.

The amber thermal light is lit. The

1. Check the fan circuit breaker

1.

The fan motor may be faulty.

machine does not have welding

located on the front panel.

 

Disconnect and test using an

output, the fan does NOT run and

Reset if tripped

 

isolated 120VAC supply.

the digital output display never

 

2.

Check the leads #250, #253,

reads a value greater than 100.

 

 

 

and #252 between the fan

 

 

 

 

 

 

motor, the circuit breaker and

 

 

 

the control board. See the

 

 

 

Wiring Diagram.

 

 

3.

Make certain the 120VAC fan

 

 

 

voltage is being developed by

 

 

 

the main transformer. See the

 

 

 

Main Transformer Test.

 

 

4.

Make sure the shunt and the

 

 

 

output display are operating

 

 

 

properly. See Display

 

 

 

Calibration Procedure.

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- 800-833-9353.

MULTI-SOURCE

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Contents MULTI-SOURCE TM California Proposition 65 Warnings SafetyElectric Shock can kill Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Multi-Source K1752-1 InstallationTilting Safety PrecautionsSelect Proper Location StackingInput and Grounding Connections Fuse and Wire SizesParalleling Output ConnectionsMULTI-SOURCE Table of Contents Operation Section Operation Safety InstructionsRecommended EQUIPMENT/PROCESSES Design Features and ADVAN- TagesGeneral Description Recommended EQUIPMENT/CONNECTIONS Controls and SettingsTable of Contents Accessories Field Installed Options / Accessories Factory Installed Options / AccessoriesTable of Contents Maintenance Routine and Periodic MAINTE- Nance Safety PrecautionsFigure D.1 Major Component Location MULTI-SOURCE Table of Contents Theory of Operation Input VOLTAGE, FILTER, Contac TOR and Control Trans Former General DescriptionReturn to Section Section TOC Troubleshooting & RepairOperation Protection Devices and CIR Cuits Figure E.5 SCR Operation SCR OperationTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Electric Shock can kill PC Board Troubleshooting Procedures and ReplacementTroubleshooting Guide T1 Test Calibration ProcedurePerform the Firing Board Test Perform the Main TransformerCircuit external to the Multi Main Transformer Test Technical SpecificationsInput Contactor Test Functions ProblemsControl Transformer T2 Voltage Test Test DescriptionFigure F.1. Control Transformer Location & Leads Test Procedure575 VAC 43.0 VAC 460 VAC 34.50 VAC 380 VAC 28.50 VAC Secondary Thermostat Input Contactor Test 241COIL Input Contactor TestTest for Contact Continuity Removal and Replacement ProcedureMULTI-SOURCE Main Transformer T1 Voltage Test Contactor Test Main Transformer T1 Voltage TestFigure F.6. Main Secondary Lead Test Points MULTI-SOURCE Static SCR Test Static SCR Test Leads Remove Red Paint Active SCR Test Active SCR Test Active SCR Test Remove Red Paint SW1 MULTI-SOURCE Control Board Test See Figure F.15 Control Board Test#341 #230 #215 #231 #263 #201 J1 MULTI-SOURCE Firing Board Test Static and Active SCR Tests Figure F.17Then Table F.2. LED 7, 8 and 9 Check List#231 #215 #340 J8 #287 MULTI-SOURCE Meter Accuracy Check Control Board Normal Open Circuit Voltage Waveform no Load Volts Typical SCR Gate Voltage Waveform no Load MULTI-SOURCE Description Input Contactor Cleaning AND/OR ReplacementRemoval Procedure Coil 240MULTI-SOURCE Control Board Replacement Procedure Control Board Firing Board Replacement Procedure Firing Board SCR Bridge / Heat Sink Assembly Replacement Procedure Bridge Assembly Mount #251 Mounting Bolt Removal of Individual SCR Heat Sink Assemblies Figure F.27 See Figure F.26Perform Meter Accuracy Test No Load Readings FAN OFFMaximum Open Circuit Voltage MULTI-SOURCE Table of Contents Electrical Diagrams Section Electrical DiagramsMULTI-SOURCE Wiring DiagramSchematic Control PC Board Return to Section PC Board ASSEMBLY-CONTROLSchematic Firing Printed Circuit Board TP1 PC Board ASSEMBLY-FIRINGM14312 PC Board Assembly SnubberSVM Error Reporting Form

SVM155-A specifications

The Lincoln Electric SVM155-A is a state-of-the-art welding machine that excels in versatility and performance, making it ideal for both professional welders and hobbyists. This multi-process welder supports MIG, TIG, and stick welding processes, allowing users to tackle a wide range of applications with a single device. Its user-friendly design and advanced technology make it an exceptional choice for those looking to enhance their welding capabilities.

One of the main features of the SVM155-A is its robust power output, which can handle welding materials ranging from thin sheets to heavier stock. The welder offers a high duty cycle, ensuring that users can work efficiently without the need for prolonged breaks. This is especially important in industrial settings where productivity is key. Additionally, the SVM155-A is equipped with a digital display that allows for easy monitoring and precise control of the welding parameters, ensuring consistency in weld quality.

The European-designed INVERTER technology embedded in the SVM155-A significantly contributes to its lightweight and compact design. Weighing in at only 19.4 lbs, this welder is portable and ideal for fieldwork or workshops where space is limited. The inverter technology not only reduces the size and weight but also improves energy efficiency, leading to lower operational costs over time.

The SVM155-A also features advanced safety mechanisms, including over-current protection to safeguard the machine from potential damage during excessive use. It also includes a thermal overload shut-off, which prevents overheating, ensuring a longer lifespan for the welder.

Another standout characteristic of the SVM155-A is its exceptional arc stability and ease of use. The machine is designed to provide a smooth and consistent arc, reducing spatter and ensuring clean welds. Moreover, the welder is compatible with a wide range of materials, including stainless steel, aluminum, and carbon steel, further enhancing its versatility.

In conclusion, the Lincoln Electric SVM155-A is a powerful, durable, and multifunctional welding machine that incorporates advanced technologies to meet the needs of modern welding applications. Its portability, safety features, and ability to deliver high-quality welds make it an excellent investment for anyone looking to improve their welding skills or expand their capabilities in various welding projects.
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