Lincoln Electric SVM155-A service manual SW1

Page 57

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F-29

TROUBLESHOOTING & REPAIR

F-29

 

 

 

 

 

ACTIVE SCR TEST (Continued)

 

 

 

 

FIGURE F.13. SCR Test Setup

 

 

 

 

 

 

 

 

SW1

R2

 

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V

R1

6 VOLT

 

A

LANTERN

SCR

G

BATTERY

UNDER C

TEST

SW2

R1= 4 ohms/10 watts R2= 3 ohms/10 watts

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To test SCRs construct the circuit outlined above. Resistor values are plus or minus ten percent. The voltmeter scale should be low, approximately 0-5 or 0-10 volts DC.

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7.To test SCRs, construct the circuit outlined in Figure F.13. Use one 6V lantern battery. Resistor values are in ohms +/- 10%, The voltmeter scale should be low, approxi- mately 0-5 or 0-10 volts.

BATTERY TEST

Check the battery by shorting leads (A) and

(C)and then close switch SW1. Replace bat- tery if voltage is less than 4.5 volts.

A. Connect SCR into the test circuit as shown (A) lead to anode (C) lead to cath- ode and (G) lead to the gate.

B. Close switch SW1 (switch SW2 should open), voltmeter should read zero. If the voltmeter reads higher than zero than the SCR is shorted.

NOTE: Do not disassemble the heat sinks.

8.With switch SW1 closed, close switch SW2 for two seconds and release. The

voltmeter should read 3 to 6 volts before and after switch SW2 is released. If the voltmeter does not read, or reads only while SW2 is depressed, the SCR or bat- tery is defective (repeat battery Test Procedure).

9.Open switch SW1, disconnect the gate lead (G) and reverse the (A) and (C) leads on the SCR. Close switch SW2. The volt- meter should read zero. If the voltage is higher than zero, the SCR is shorted.

10.Replace any SCR assembly that does not pass test.

11.When test is completed, reconnect the positive bridge leads to the shunt.

12.Reconnect Plug J4 into the Firing Board.

13.Replace the case top, sides and control panel.

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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 InstallationSelect Proper Location Safety PrecautionsStacking TiltingInput and Grounding Connections Fuse and Wire SizesParalleling Output ConnectionsMULTI-SOURCE Table of Contents Operation Section Operation Safety InstructionsDesign Features and ADVAN- Tages General DescriptionRecommended EQUIPMENT/PROCESSES 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 Perform the Firing Board Test Calibration ProcedurePerform the Main Transformer T1 TestCircuit 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.26No Load Readings FAN OFF Maximum Open Circuit VoltagePerform Meter Accuracy Test 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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