Lincoln Electric SVM155-A service manual #341 #230 #215 #231 #263 #201 J1

Page 61

TOC

TOC

F-33F-33

TROUBLESHOOTING & REPAIR

CONTROL BOARD TEST (Continued)

Return to Section

Return to Section TOC

Return to Master

Return to Master TOC

10.LED 6 indicates that the fan motor driver circuit has been activated and the fan motor should be running. LED 6 and the fan motor will be on for about 5 minutes after LED 4 goes off. See Figure F.15.

11.LED 7 will light if a positive voltage is pre- sent on the negative output terminal (AC instead of DC). This is an indiction of a shorted SCR in the output bridge rectifier. See SCR Rectifier Bridge Test. The input contactor will open and will remain deenergized until the power switch is turned off for a minimum of 1 second. See Figure F.15.

12.The green light, located on the front con- trol panel, is lit when the machine’s output voltage is present and at a safe level. The voltage range is from 40VDC to 113VDC peak. This voltage can be measured at the output terminals and verified at Plug J1-pin 6(+) lead #215 to Plug J2-pin 1(-) lead #222D. See Figure F.15. If the output voltage is within range but the green light is not lit either the green light is faulty or the control board is faulty. Normal operat- ing voltage for the green light is about 3.5VDC. A voltage of about 5.0VDC would indicate the light is open and the control board circuit is operating correctly.

This can be measured at Plug J1-pin 16(+) lead #232 to Plug J1-pin 15(-) lead #233. See Figure F.15.

13.The yellow (amber) light, located on the front panel, will light if the “open thermo- stat” (secondary and SCR heat sink) sig- nal is sent to the fan control and output disable circuits. The voltage on the two thermostat circuit is from 24VDC to 38VDC. This voltage is dependent upon the input voltage applied to the Multi- Source. This voltage can be verified at Plug J1-pin 3(+) lead #263 to Plug J1-pin 11(-) lead #264. This voltage will be pre- sent if only one of the thermostats are open or an associated lead is disconnect- ed. See the Wiring Diagram. Normal operating voltage for the amber light is about 2.2VDC. A voltage reading of about 5.0VDC would indicate the amber light is open and the control board is supplying the correct signal. This can be verified at Plug at Plug J1-pin 13(+) lead #234 to plug J1-pin 12(-) lead #235. This light voltage will normally be present ONLY when the thermostat circuit is open. See the Wiring Diagram. See Figure F.15.

Section TOC

Master TOC

FIGURE F.15. Control Board with LED, Plug and Lead Locations

Return to

Return to

#274 #273 #222D

J2

#341 #230 #215 #231 #263

#201 J1

CONTROL BOARD

#232

#233

#234

#235

#264 #222A

Return to Section TOC

Return to Master TOC

J3

MULTI-SOURCE

Page 60 Page 62
Image 61
Page 60 Page 62
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 InstructionsGeneral Description Design Features and ADVAN- TagesRecommended 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.26Maximum Open Circuit Voltage No Load Readings FAN OFFPerform 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.
Top Page Image Contents