Lincoln Electric SVM155-A service manual Main Transformer T1 Voltage Test, Contactor Test

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F-18F-18

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER (T1) VOLTAGE TEST (continued)

FIGURE F.5. Input Contactor, Reconnect Panel, and Primary Leads to Main Transformer

Locations

Reconnect Panel

Assembly

T3 W

T2 V

Input Contactor

T1 U

 

 

TOP VIEW

 

INPUT CONTACTOR

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TEST PROCEDURE

1.Disconnect main AC input power to the machine.

2.Using a 3/8” nutdriver, remove roof and sides of case cover.

3.Inspect the input contactor, reconnect panel, and primary leads to the main trans- former for loose or faulty connections. See Figure F.5.

4.Carefully apply input power, turn on and make sure the input contactor (1CR) ener- gizes.

5.Carefully test with an AC voltmeter for the proper main AC input voltage to the line side of the input contactor (1CR). See Wiring Diagram. See Figure F.5.

U to V

V to W

U to W

NOTE: If proper voltage is not present in any or all of the three phases, check input fuses and leads.

5.Test with an AC voltmeter for proper main AC input voltage from the output side of

the input contactor (1CR). See Wiring Diagram. See Figure F.5.

T1 to T2

T2 to T3

T1 to T3

a.If the correct voltage is present, the contactor is working properly.

b.If the correct voltage is not present for any or all of the three phases, the con- tactor may be faulty. See Input

Contactor Test.

6.Test with an AC voltmeter for approximate- ly 97 VAC from each of the six main trans- former secondary leads to the common buss connected to the negative output ter- minal. See Figure F.6.

a.If one or more of the above voltage tests are incorrect, check for loose or faulty wiring. If the wiring is good, then the main transformer may be faulty.

NOTE: A long wire with a clip or a long probe may be required to reach the lower middle lead.

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 K1752-1Stacking Safety PrecautionsSelect Proper Location 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 Perform the Main Transformer Calibration ProcedurePerform the Firing Board Test 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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