Lincoln Electric SVM155-A service manual Figure F.17, Static and Active SCR Tests

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F-36F-36

TROUBLESHOOTING & REPAIR

FIRING BOARD TEST (Continued)

FIGURE F.16. FIRING BOARD LOCATION

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J5

J6

J7

J8

J4

Firing Board

TEST PROCEDURE FOR NORMAL FIRING BOARD OPERATION

1.Disconnect main AC input power to the machine.

2.Remove screws, loosen and lower the front panel to access the firing board on the left side of control box while facing the machine. See Figure F.16.

3.Visually inspect the Firing Board for loose or faulty connections and obvious physi- cal damage.

J2

J1

J3

Control Board

NOTE: To verify that the control board is sending the correct output enable signal to the firing board, check from plug J8, pin 7(+) (lead #340) to plug J5, pin 12 (-) (lead #215). See Figure F.17. See the wiring diagram. Normal voltage is approximately less than 1.0 VDC. If not correct the control board may be faulty.

7.Locate LEDs 1 thru 6. Each LED should glow with equal brightness.

NOTE: LEDs 1 through 6 indicate that the gate firing signals are being generated to send to each of the output SCRs.

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WARNING

Electric Shock can kill.

•With the input power on, there are high voltages inside the machine. Use caution when reaching into the

machine or touching any internal part of the machine while the power is on. High voltage is present.

4.Reconnect the input power and turn the MULTI-SOURCE on.

5.Locate LEDs 7, 8, and 9 on the Firing Board. See Figure F.17. Each LED should be ON and equally bright. Use Table F.2 to check LED operation.

6.Make certain that plug J7 (jumper plug) is in place. See Figure F17. and the wiring diagram.

8.If LED 2, located on the control board, is bright along with LEDs 7,8 and 9 on the Firing Board and LEDs 1 through 6 are unequal in brightness, check to make sure lead #231 is not loose or broken. See the wiring diagram. Normal voltage range at plug J5, pin 13 (+) (lead #231) to plug J5, pin 12 (-) (lead #215) is 3 to 13 VDC. At an open circuit condition the normal voltage is approximately 10 VDC. See

Figure F.17.

9.If one or two of the LEDs 1 through 6 are dimmer or brighter than the others, this could indicate an open or shorted gate on an output SCR. Perform the

Static and Active SCR Tests.

MULTI-SOURCE

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Contents MULTI-SOURCE TM Safety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion Précautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Multi-Source K1752-1Safety Precautions Select Proper LocationStacking TiltingFuse and Wire Sizes Input and Grounding ConnectionsOutput Connections ParallelingMULTI-SOURCE Table of Contents Operation Section Safety Instructions OperationGeneral Description Design Features and ADVAN- TagesRecommended EQUIPMENT/PROCESSES Controls and Settings Recommended EQUIPMENT/CONNECTIONSTable of Contents Accessories Factory Installed Options / Accessories Field Installed Options / AccessoriesTable of Contents Maintenance Safety Precautions Routine and Periodic MAINTE- NanceFigure D.1 Major Component Location MULTI-SOURCE Table of Contents Theory of Operation General Description Input VOLTAGE, FILTER, Contac TOR and Control Trans FormerTroubleshooting & Repair Return to Section Section TOCOperation Protection Devices and CIR Cuits SCR Operation Figure E.5 SCR OperationTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures and Replacement Electric Shock can killTroubleshooting Guide Calibration Procedure Perform the Firing Board TestPerform the Main Transformer T1 TestCircuit external to the Multi Technical Specifications Main Transformer TestFunctions Problems Input Contactor TestTest Description Control Transformer T2 Voltage TestTest Procedure Figure F.1. Control Transformer Location & Leads575 VAC 43.0 VAC 460 VAC 34.50 VAC 380 VAC 28.50 VAC Secondary Thermostat Input Contactor Test Input Contactor Test 241COILRemoval and Replacement Procedure Test for Contact ContinuityMULTI-SOURCE Main Transformer T1 Voltage Test Main Transformer T1 Voltage Test Contactor 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 Control Board Test See Figure F.15#341 #230 #215 #231 #263 #201 J1 MULTI-SOURCE Firing Board Test Figure F.17 Static and Active SCR TestsTable F.2. LED 7, 8 and 9 Check List Then#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 Input Contactor Cleaning AND/OR Replacement DescriptionRemoval Procedure 240 CoilMULTI-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 See Figure F.26 Figure F.27Maximum Open Circuit Voltage No Load Readings FAN OFFPerform Meter Accuracy Test MULTI-SOURCE Electrical Diagrams Table of Contents Electrical Diagrams SectionWiring Diagram MULTI-SOURCESchematic Control PC Board PC Board ASSEMBLY-CONTROL Return to SectionSchematic Firing Printed Circuit Board PC Board ASSEMBLY-FIRING TP1PC Board Assembly Snubber M14312SVM 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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