FAN Motor and Blade Removal | Lincoln Electric SVM100-A specification

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F-41

TROUBLESHOOTING & REPAIR

FAN MOTOR AND BLADE REMOVAL (continued)

Fan Baffle

Fan

Mounting

Hardware

Vertical

Bracket

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TEST PROCEDURE

1.Remove main supply power to machine.

2.Remove case sides and top.

3.Locate and SUPPORT rectifier and fan baffle assembly.

4.Remove the two self-tapping screws from the input access door.

5.Remove the five thread-forming screws holding the fan baffle and rectifier assembly to the case back. AT THIS POINT THE RECTIFIER AND FAN BAFFLE ASSEMBLY WILL DROP UNLESS SUPPORTED.

Once the baffle assembly and case back are separated there is sufficient working space for fan blade and fan motor removal and replacement.

6.The fan blade can be removed by loos- ening the clamp on the fan blade and carefully sliding the fan blade off of the motor shaft. Note: When reinstalling the fan blade make certain the blade is on the motor shaft in the correct location. Approximately .25” past end of shaft.

7.If the fan motor is to be removed the leads to the motor must be disconnect- ed. The fan motor may be removed by removing the two #8-32 hex nuts and associated plain and lock washers that mount the motor to the vertical bracket.

SQUARE WAVE TIG 255

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Lincoln Electric SVM100-A service manual FAN Motor and Blade Removal, Test Procedure

Contents

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