Square Wave TIG | Lincoln Electric SVM100-A instruction

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RETURN TO MAIN INDEX	SVM100-A

SQUARE WAVE TIG 255	December 1995

For use with machine Code Numbers 10022

For use with machine Code Numbers 10023

For use with machine Code Numbers 10024

For use with machine Code Numbers 10025

For use with machine Code Numbers 10026

For use with machine Code Numbers 10134

Safety Depends on You

Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation ... and thought- ful operation on your part. DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT WITHOUT READING THIS MANUAL AND THE SAFETY PRECAUTIONS CONTAINED THROUGHOUT. And, most importantly, think before you act and be careful.

SERVICE MANUAL

World's Leader in Welding and Cutting Products

Premier Manufacturer of Industrial Motors

Sales and Service through Subsidiaries and Distributors Worldwide

22801 St. Clair Ave. Cleveland, Ohio 44117-1199 U.S.A. Tel. (216) 481-8100

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Lincoln Electric SVM100-A service manual Square Wave TIG

Contents

Square Wave TIG Electric Shock can kill SafetyARC Rays can burn Fumes and Gases can be dangerous Welding Sparks can cause fire or explosion Cylinder may explode if damaged May be dangerous Electric and Magnetic Fields Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of Contents Technical Specifications Square Wave TIG Installation High Frequency Interference Protection Safety PrecautionsSelect Suitable Location Stacking Ground Connection Input ConnectionsInput Supply Connections Output Connections Reconnect ProcedureTIG Torch Connection Stick Electrode Cable Connection Table A.1 Operation Section Operating Instructions OperationGeneral Warnings Fumes and Gases Section TOC While Weld ING TIG Gtaw Single Phase Polarity Do not Switch AC & DC Recti Fier Power SourceWork Connec Coolant Tion Output Operational Features and Controls Design Features AdvantagesGeneral Description Recommended Processes and Equipment Limitations Welding Capability Control Panel Keys Controls and Settings Load Case Front Controls Table B.1 Recommended Polarity Settings for TIG Welding Accessory Operation TIG WeldingHand and Foot Amptrol Welding Operation TIG Welding Guidelines Table B.2 Typical Current Ranges 1 for Tungsten Electrodes TIG Welding Sequence Operation 2-STEP ModeSquare Wave TIG 255 12/95 TIG Welding Sequence Operation 4-STEP Mode Advanced TIG Welding Features Auxiliary PowerALL Machines AC Wave Balance and Auto Balance Overload Protection Square Wave TIG Accessories Section Options / Accessories AccessoriesInstallation of Field Installed Options Undercarriage Function Maintenance Section Maintenance MaintenanceRoutine and Periodic Maintenance Safety Precautions Figure D.1 General Assembly Exploded View Square Wave TIG Theory of Operation Section Power Supply Block Logic Diagram Input Line Voltage and Main Transformer Theory of Operation Output Rectification and Feedback Control High Voltage / High Frequency Circuit DC Welding Circuit DC Welding Output AC Welding Circuit AC Welding Output SCR Operation Square Wave TIG SCR Operation Thermal Protection Troubleshooting & Repair Section HOW to USE Troubleshooting Guide 1TROUBLESHOOTING & Repair PC Board Troubleshooting Procedures Troubleshooting & Repair Output Problems Troubleshooting Guide 12/95 Square Wave TIG Troubleshooting & Repair Possible Areas of Misadjustments Problems SymptomsRecommended Course of Action Function Problems Troubleshooting Guide Troubleshooting & Repair TIG Mode Problems Troubleshooting & Repair Troubleshooting Guide TIG Welding Problems Troubleshooting & Repair Stick Welding Problems Figure F.1 Control Board Connectors PC Board Connector Locations Test Description Control Transformer T2 Voltage TestMaterials Needed Control BOX Test Procedure Figure F.4 Control Board and Transformer Control Transformer T2 Voltage Test PROTECTION/SNUBBER Board Continuity Test PROTECTION/SNUBBER Board Continuity Test Table F.6 Square Wave TIG Figure F.6 PROTECTION/SNUBBER Board Test Points ARC Start Trigger Circuit Test ARC Start Trigger Circuit Test Figure F.9 PROTECTION/SNUBBER Board Test Points Static SCR Test Figure F.11 Protection Board Plug Locations Static SCR Test Active SCR Test Figure F.13 PROTECTION/SNUBBER Board Plug Locations Active SCR Test Silicon Controlled Rectifier Test Battery Test Scope Settings Normal Open Circuit Voltage Waveform DC Stick Mode Normal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC TIG Mode Machine Loaded to 200 Amps AT 50 VDC Typical Output Voltage Waveform Machine Loaded DC TIG Mode Machine Loaded to 50 Amps AT 26VAC AC TIG Mode Auto Balance onMachine Loaded to 200 Amps AT 46 VAC Typical SCR Gate Voltage Waveform Volts 5ms Volts 2ms Troubleshooting & Repair Tools Required FAN Motor and Blade Removal FAN Motor and Blade Removal Materials Required SCR Heat Sink Assembly Removal SCR Heat Sink Assembly Removal Input Idle Amps Retest After RepairRecommended Meters for Machine Output Tests Figure F.16 Transformer Lead Test Points Retest After Repair cont’d Electrical Diagrams Electrical Diagrams PTC1,PTC2 THERMISTOR-PTC,56 OHMS,90MA Control Board G2150 Control Board G2150 cont’d Square Wave TIG PROTECTION/SNUBBER Board L9255 CAPACITOR-CEMO,4700P,50V,10% Square Wave TIG Wiring Diagram Square Wave TIG 6 a 0 a 7 a 8 a 3 C Machine Schematic Square Wave TIG A C C T G2150 Y P a D Control Board Schematic Square Wave TIG 255 cont’d G2150 PROTECTION/SNUBBER Board Schematic Square Wave TIG 255 L9255 Keypad LED Board Square Wave TIG 255 L9212