Diode Stud Foot Inch Size Pounds | Lincoln Electric SVM162-B

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F-56	TROUBLESHOOTING & REPAIR	F-56
	TROUBLESHOOTING & REPAIR

MOUNTING OF STUD TYPE DIODES TO ALUMINUM HEAT SINKS (CONT’D)

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PROCEDURE

1.Loosen the appropriate diode nut and remove the diode that is to be replaced.

2.Clean the area on the heat sink around the diode mounting surface using a putty knife, or similar tool, DO NOT SCRATCH THE DIODE MOUNTING SURFACE.

3.Polish each heat sink's mounting surface using NO. 000 fine steel wool. Wipe surface clean with

alint free cloth or paper towel.

4.Inspect the mounting surfaces of each new diode. Remove all burrs and wipe clean. Do not use steel wool or any abrasive cleanser on the diode mounting surface.

5.Apply a thin (0.0003" to 0.0007") uniform layer of E1868 (Dow Corning 340) heat sink compound to the heat sink mounting surface.

a.Do not apply compound to diode stud or mounting threads.

b.The diode threads must be clean and free of defects so that the nut can be finger tightened before applying torque. A "slip" type torque wrench must be used to tighten the diode nut.

6.Tighten the diode nuts to the specifications in the following table.

a.The nuts for diodes with steel studs are to be started by hand and then torqued as per the following table.

b.The nuts for diodes with copper studs are to run on all the way by hand then torqued as per the following table.

	DIODE STUD		FOOT-		INCH-
	DIODE STUD		FOOT-		INCH-
	SIZE		POUNDS		POUNDS
	3/4 - 16		25-27		300-324
	3/8 - 24		10±.5		125+0/-5
	1/4 - 28				22-25

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c.Turn a minimum of 1/2 turn more while torquing per the table.

PRECISION TIG 375

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Lincoln Electric SVM162-B Mounting of Stud Type Diodes to Aluminum Heat Sinks CONT’D, Diode Stud Foot Inch Size Pounds

Contents

Safety Depends on You Precision TIG For Engine SafetyPowered equipment Mar ʻ95 ARC Rays can burn Fumes and GasesAug ʻ06 Welding Sparks can Cylinder may explode If damagedIii LES Machines À Souder À Précautions DE SûretéPrécautions DE Sûreté Pour Transformateur ET À Master Table of Contents for ALL Sections Table of Contents Installation Section Unbalance 70% Penetration AC TIG 15.4 200 100% 28.0 InstallationUnbalance 70% Penetration AC TIG 16.1 255 60% 29.0 225 Unbalance 70% Penetration AC TIG 14.8 150 Output Current Maximum Open Safety Precautions ProtectionSelect Suitable Location Before working on this equip Turn the input power OFF atDisconnect switch or fuse box Ment Work Cable Connection Figure A.2 Auxiliary Power Connections Figure A.3 Robotic Interface Connection Figure A.4 Return to Section TOC Table of Contents Operation Section Operation Product DescriptionPipe Thawing Recommended Processes Equipment Stick mode the Electrode circuits Controls and SettingsWhen the Power Source is on Both the Stick and TIG torch cables AC Balance Ontrol Maximum Output Control The large knob Operation for Codes Above 11000 only Menu Button and Display Switch CodesTIG Mode Menu Select Advanced Panel Controls Gure B.3 Pulse Frequency Control Time Control PULSE% onPulse Background Current Control Internal SET UP Controls TIG Welding FeaturesStick Welding Features Step Trigger Modes Figure B.4 TIG Weld Cycle Chart Codes below 11000 K1829-1 Setup Guidelines for TIG Welding With AN Amptrol Figure B.6 Smaw Process Making a TIG Weld with AN AmptrolRecommended Electrode Amperage Ranges Precision TIG Gtaw Process Table of Contents Accessories for Codes below Optional EquipmentMagnum PTA and PTW Series Torches Accessories for Codes Above Return to Section TOC Maintenance Component Location and Access Safety Precautions Overload Protection Service Procedures Spark GAP AdjustmentUNDER-COOLER Service Warni Table of Contents Theory of Operation Section Input Power Circuit Theory of OperationGeneral Description Output Rectification Control board also monitors the thermostatsSee SCR Operation High VOLTAGE/HIGH Frequency Circuit Figure E.4 High Voltage / High Frequency Circuit DC Welding Output Figure E.5 DC Welding Output AC Welding Output Figure E.7 AC Welding Output SCR Operation Figure E.9 SCR Operation FAN-AS-NEEDED F.A.N 8THEORY of OPERATIONE-8Protection Circuits Thermal Protection Table of Contents Troubleshooting & Repair Section 2TROUBLESHOOTING & REPAIRF-2 HOW to USE Troubleshooting Guide Troubleshooting & Repair Reconnect Troubleshooting GuideProcedure Test Control Board TransformerSCR Bridge Test Perform the Protection Board Installed, remove it and replaceMachine functions normally T1 Transformer See Note below Protection BoardPerform the T1 Transformer Perform the SCR Bridge Test Perform the SCR Bridge Tests Est Perform the Gas Solenoid Test Maintenance Electric ShockCan Kill Maintenance Section High frequency transformer See the Maintenance Secti Problems Possible AreasSymptoms Misadjustments Course of Action To Technical Specifications Stick Welding Problems Stick electrode blasts-off Welding current may be too high Function Problems Installation Manual Be plugged into J3 Display switch may be faulty Precision TIG Voltmeter/Ohmmeter Nut Driver Wiring Diagram 19TROUBLESHOOTING & REPAIRF-19Meter Calibration Adjustments Description 20TROUBLESHOOTING & REPAIRF-20 Meter Calibration AdjustmentsCalibration Check 21TROUBLESHOOTING & REPAIRF-21 Ammeter Calibration ProcedureControl board. See Figure F1 Return to Section TOC 23TROUBLESHOOTING & REPAIRF-23 High Frequency Circuit Disable ProcedureNut Driver Electrical Insulating Tape 24TROUBLESHOOTING & REPAIRF-24 High Frequency Circuit Disable ProcedureProcedure 25TROUBLESHOOTING & REPAIRF-25 Protection Board TestTest Description Protection Board Test Resistance Between Reading 27TROUBLESHOOTING & REPAIRF-27 T1 Main Transformer Test 28TROUBLESHOOTING & REPAIRF-28 Test ProceduresT1 Main Transformer Test Test Points Acceptable Voltages Primary Windings Return to Section TOC 31TROUBLESHOOTING & REPAIRF-31 GAS Water Solenoid Test GAS Water Solenoid Test Test ProcedureDisable Procedure Perform the High Frequency Circuit 33TROUBLESHOOTING & REPAIRF-33 Static SCR Test Assembly. See SCR Bridge Assembly 34TROUBLESHOOTING & REPAIRF-34Removal and Replacement Static SCR Test Service and repair Active SCR Test 36TROUBLESHOOTING & REPAIRF-36 Active SCR Test Active SCR Test Figure F.9 SCR Gate Locations Scope Settings 39TROUBLESHOOTING & REPAIRF-39DC TIG Mode Typical Output Voltage Waveform Machine Loaded to 2 Amps Milliseconds in time. The machine 40TROUBLESHOOTING & REPAIRF-40AC TIG Mode Was loaded with a resistance grid bank This is the typical DC + output voltage 41TROUBLESHOOTING & REPAIRF-41Typical AC Voltage Waveform Machine Loaded to 50 Amps Horizontal Sweep Ms/Div 42TROUBLESHOOTING & REPAIRF-42 Typical AC Voltage Waveform Machine Loaded to 2 AmpsAC Balance Control in Auto Output Control AT Minimum 43TROUBLESHOOTING & REPAIRF-43 Return to Section TOC 45TROUBLESHOOTING & REPAIRF-45 High Voltage Transformer Removal and ReplacementNut Driver Phillips Head Screwdriver Off-set Wire Cutters Removal Procedure 46TROUBLESHOOTING & REPAIRF-46Removal and Replacement Replacement Procedure 47TROUBLESHOOTING & REPAIRF-47 Figure F.11 3/8 Screw & Leads S and F Locations Return to Section TOC 49TROUBLESHOOTING & REPAIRF-49 Control Board Removal and ReplacementNut Driver Phillips Head Screwdriver Wire Cutters 50TROUBLESHOOTING & REPAIRF-50 Control Board Removal and Replacement 51TROUBLESHOOTING & REPAIRF-51 J10 J11 J12 Return to Section TOC 53TROUBLESHOOTING & REPAIRF-53 SCR Bridge Assembly Removal and ReplacementNut Driver Pliers Crimp Wire Cutters 54TROUBLESHOOTING & REPAIRF-54 SCR Bridge Assembly Removal and ReplacementSee Figure F.14 SCR Bridge Removal and Replacement Mounting of Stud Type Diodes to Aluminum Heat Sinks CONT’D Diode Stud Foot Inch Size Pounds25-27 300-324 10±.5 125+0/-5 22-25 57TROUBLESHOOTING & REPAIRF-57 Polarity Switch Removal and Replacement 58TROUBLESHOOTING & REPAIRF-58 Polarity Switch Removal and Replacement 59TROUBLESHOOTING & REPAIRF-59 SCR Removal and Replacement 60TROUBLESHOOTING & REPAIRF-60 SCR Removal and ReplacementSpecial Instructions Open Circuit Voltages Retest After RepairInput Idle Amps Recommended Meters for Machine Output Tests Return to Section TOC Electrical Diagrams Section Section G Control P.C. Board Schematic Electrical Diagrams Wiring Diagram Entire Machine Code 10806 G4031 Wiring Diagram Entire Machine Code 10807 G4031-1 SCR2 Precision TIG 275 Wiring Diagram Wiring Diagram Entire Machine Code 10893 G4031-2 Wiring Diagram Entire Machine Code 11158 G5692 Precision TIG 275 Wiring DiagramSchéma DE Câblage Diagramas DE Cableado Wiring Diagram Entire Machine Code 11159 G5692-1 Robotic Interface Connection Connexion Interface Robotique Schematic Entire Machine below Code 11000 G4075 Return to Section Schematic Entire Machine Above Code 11000 G5691 Change Detail Released from X A.02 Schematic Control PC Board below Code 11000 G3908 Electrical Diagrams Electrical Diagrams PC Board ASSEMBLY-CONTROL below Code 11000 G3909-2 G3909 Schematic Control PC Board Above Code 11000 G4762 Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams PC Board ASSEMBLY-CONTROL Above Code 11000 G4763-1 G4763 SCHEMATIC-PROTECTION P.C. Board M16115 16115 M PC Board ASSEMBLY-PROTECTION M16062-1 Reqd Identification SCHEMATIC-BYPASS / Stabilizer P.C. Board S22530-1 Code 10806 PC Board ASSEMBLY-BYPASS / Stabilizer L10121-1 Code 10806 L10121-1 SCHEMATIC-BYPASS and CE P. C. Board S24206 Code Frame Ground PC Board ASSEMBLY-BYPASS and CE L10882-1 Code Bottom View Schematic TIG Option P.C. Board below Code 11000 G4039 Electrical Diagrams Return to Section TOC To Section TOC Schematic TIG Option P.C. Board Above Code 11000 G4760 Electrical Diagrams Electrical Diagrams MAK E Detail SVM Error Reporting Form