Table of Contents Operation Section | Lincoln Electric SVM129-B

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Section B-1Section B-1

TABLE OF CONTENTS
- OPERATION SECTION -
Operation	Section B
Safety Precautions	B-2
General Description	B-3
Recommended Equipment	B-3
Operating Controls	B-3
Design Features	B-3
Welding Capability	B-3
Limitations	B-3
Operational Features and Controls	B-4
Welding Operation	B-5
Welding Parameters and Guidelines	B-6
Recommended Settings for STT II	B-7

INVERTEC STT

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Lincoln Electric SVM129-B service manual Table of Contents Operation Section

Contents

Invertec STT TM & STT II TM Safety Depends on You California Proposition 65 Warnings Safety ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Cylinder may explode if damaged Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section INPUT- Three Phase only Installation Technical Specifications -Invertec STT For Codes 11115 Input Connections Select Suitable LocationStacking Tilting Ground Connection Input Cable Installation and CON- Nection Wire Feeder Output Connections Input Voltage Reconnect ProcedureOutput Connections Table of Contents Operation Section Operation Safety PrecautionsOperating Instructions General Warnings Recommended Equipment Design Features and AdvantagesOperating Controls Welding Capability Operational Features and Controls Welding Operation Peak Current Welding Parameters and GUIDE- Lines Table B.1 100% CO2 Gas Shield Set for Steel Mode Welding Procedures for STT Invertec STT Table of Contents Accessories ARC Options / Accessories Figure C.2 LN-742 to STT II Connection LN-742 or STT-10 Wire Feeder Connection Instructions Connection Diagram Invertec STT Table of Contents Maintenance Input Filter Capacitor Discharge Procedure Preventive Maintenance Figure D.2 Major Component Locations Table of Contents Theory of Operation Section General Description Theory of OperationInput Voltage RECONNECT, Protection BOARD, Rectification Precharge Return Return to Section TOC Switch Boards Voltage Feedback Main TRANSFORMER, Output Rectification and Choke Figure E.6 Control BOARD, Igbt Drive and Module Control BOARD, Igbt Drive and Module Remote Protection Board Power Board Field Effect Transistor FET Operation Theory of OperationsPassive Active Minimum Output Pulse Width ModulationMaximum Output Overload Protection Protective CircuitsThermal Protection Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairOscilloscope Warning Return to PC Board Troubleshooting Procedures Output Problems Troubleshooting Guide Troubleshooting & Repair Applied to the machine Test Troubleshooting & Repair Welding Problems Switch Board Test Troubleshooting Guide Troubleshooting & Repair Test Description T1 Auxiliary Transformer TestMaterials Needed T1 Auxiliary Transformer Test Test Procedure Plug J21 Location Behind Reconnect Panel Test Points Normal Voltage Perform the Input Filter Capacitor Discharge Procedure Apply the correct input power and carefully Invertec STT T4 Auxiliary Transformer Test Figure F.3 Output CHOKE/IGBT Module Spliced Connection T4 Auxiliary Transformer Test Plug J22 STT STT Normal Voltages Test Points Input Rectifier Test Figure F.9 Input Rectifier Location Input Rectifier Test Test Points Invertec STT Capacitor Balance Test Capacitor Balance Test Figure F.10 Switch Board Test Points Table F.4 Expected Voltage Readings Invertec STT Switch Board Test Figure F.11 Switch Board Resistance Test Switch Board Test Table F.5 Switch Board Resistance Test Troubleshooting & Repair Description Snubber Resistors Test Figure F.12 Removing Leads Snubber Resistors Test Figure F.13 Switch Board Test Points Invertec STT Power Board Test Quick Check Procedure Power Board TestVoltage Test Procedure 501 Figure F.15 Protection Board Test Protection Board Test Test Procedure CR2 CR1 Invertec STT Trigger Circuit Test Figure F.19 Plug J31 Location Trigger Circuit Test Plug J31 Figure F.22 Simplified Trigger Circuit Diagram Igbt Module Removal and Replacement Procedure ReplacementIgbt Module Removal Figure F.24 Plug J1 Disconnection Figure F.26 STT Placed on ITS Right Side STT Invertec STT Switch Board Replacement Figure F.28 Switch Board Removal Switch Board Replacement TOC Figure F.29 Shorting Terminals 14 and 53 of Protection Board Test After Repair of Switch Boards AND/OR Capacitors Perform Retest After Repair Invertec STT Capacitor Removal Replacement Procedure Figure F.30 Output Choke Lead Disconnection Capacitor Removal and Replacement Procedure Figure F.31 Plug J1 Disconnection Figure F.33 STT Placed on ITS Right Side Figure F.34 Removing HEX Head Nuts of THROUGH-BOLTS Capacitor Replacement Plastic Retaining Insulators Figure F.36 Removing Capacitor Nuts Input Filter Capacitor Conditioning Output Rectifier Removal and Replacement Figure F.39 Choke LEAD/HEAT Sink Connection Output Rectifier Removal and Replacement Main Transformer Secondary Leads THROUGH-BOLTS Maximum Input Idle Amps and Idle Watts Retest After RepairOpen Circuit Voltage Range Environmental Protection Section G Electrical Diagrams Section Wiring Diagram Entire Machine Codes 10151 10153 G2773 Electrical Diagrams Return Wiring Diagram Entire Machine Codes 10381 10383 G3136 Wiring Diagram Entire Machine Codes 11090 11092 G4500 Return to To Master TOC Wiring Diagram Entire Machine Codes 11115 11116 G4557 X20 X32 Schematic Control PC Board Codes 10151 11092 G2781 Sheet 1 Section Schematic Control PC Board Codes 10151 11092 G2781 Sheet 2 R441 PC Board Assembly Control Codes 10151 11092 G2782 Schematic Control PC Board Codes 11115 11116 G4649 Sheet 1 Schematic Control PC Board Codes 11115 11116 G4649 Sheet 2 PC Board Assembly Control Codes 11115 11116 G4648 01816 Schematic Power PC Board All Codes M16018 Capacitors = MFD/VOLTS Inductance = Henrys PC Board Assembly Power All Codes L8033 CLEVELAND, Ohio U.S.A SCHEMATIC, Darlington Drive Schematic Darlington Drive Board Codes 10151 10383 M17581 PC Board Assembly Darlington Drive Codes 10151 10383 G2778 Schematic Igbt Drive Board Codes 11090 11116 L12144 PC Board Assembly Igbt Drive Codes 11090 11116 L12145 SWI Schematic Switch Board All Codes L8440 Switch PC Board Assembly Switch All Codes L8441 J11 J9,J10 J16 Schematic Driver Board All Codes S20799 Capacitors = MFD/VOLTS PC Board Assembly Driver All Codes L9134 79061 M Schematic Protection PC Board Codes 10151 11092 M16097 L7915 PC Board Assembly Protection Codes 10151 11092 L7915 Schematic Protection PC Board Codes 11115 11116 M20352 PC Board Assembly Protection Codes 11115 11116 L12235 01412 Schematic Current Sense PC Board All Codes S21410 STT Current Sense PC Board Assembly Current Sense All Codes M17591 File M176091BA Schematic Remote Protection PC Board All Codes M17609 PC Board Assembly Remote Protection All Codes L9657