Perform the SCR Bridge Tests | Lincoln Electric SVM162-B manual

PRECISION TIG 275

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F-9	TROUBLESHOOTING & REPAIR					F-9
TROUBLESHOOTING GUIDE					Observe Safety Guidelines
		detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
		OUTPUT PROBLEMS
The machine makes a very loud		1. Inspect the output terminal insu-	1.	Diode D1 may be shorted.
buzzing noise in DC Stick or in DC		lators for cracks or signs of over-		Check and replace if necessary.
TIG modes.	There is no current	heating.	2.	Check the polarity switch (S2) for
draw from the machineʼs output ter-
minals. (The machine is not exter-				proper function and correct con-
nally loaded).			3.	nections.
				Perform the SCR Bridge Tests.

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CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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Lincoln Electric SVM162-B service manual Perform the SCR Bridge Tests

Contents

Precision TIG Safety Depends on You Mar ʻ95 SafetyPowered equipment For Engine Fumes and Gases ARC Rays can burnAug ʻ06 Cylinder may explode If damaged Welding Sparks canIii Transformateur ET À Précautions DE SûretéPrécautions DE Sûreté Pour LES Machines À Souder À Master Table of Contents for ALL Sections Table of Contents Installation Section Unbalance 70% Penetration AC TIG 14.8 150 InstallationUnbalance 70% Penetration AC TIG 16.1 255 60% 29.0 225 Unbalance 70% Penetration AC TIG 15.4 200 100% 28.0 Maximum Open Output Current Protection Safety PrecautionsSelect Suitable Location Ment Turn the input power OFF atDisconnect switch or fuse box Before working on this equip Work Cable Connection Figure A.2 Figure A.3 Auxiliary Power Connections Figure A.4 Robotic Interface Connection Return to Section TOC Table of Contents Operation Section Product Description OperationPipe Thawing Equipment Recommended Processes Both the Stick and TIG torch cables Controls and SettingsWhen the Power Source is on Stick mode the Electrode circuits Maximum Output Control The large knob AC Balance Ontrol Select Menu Button and Display Switch CodesTIG Mode Menu Operation for Codes Above 11000 only Gure B.3 Advanced Panel Controls Time Control PULSE% on Pulse Frequency ControlPulse Background Current Control TIG Welding Features Internal SET UP ControlsStick Welding Features Step Trigger Modes Figure B.4 Codes below 11000 K1829-1 TIG Weld Cycle Chart Figure B.6 Setup Guidelines for TIG Welding With AN Amptrol Gtaw Process Making a TIG Weld with AN AmptrolRecommended Electrode Amperage Ranges Precision TIG Smaw Process Table of Contents Optional Equipment Accessories for Codes belowMagnum PTA and PTW Series Torches Accessories for Codes Above Return to Section TOC Component Location and Access Maintenance Overload Protection Safety Precautions Spark GAP Adjustment Service ProceduresUNDER-COOLER Service Warni Table of Contents Theory of Operation Section Theory of Operation Input Power CircuitGeneral Description Control board also monitors the thermostats Output RectificationSee SCR Operation Figure E.4 High Voltage / High Frequency Circuit High VOLTAGE/HIGH Frequency Circuit Figure E.5 DC Welding Output DC Welding Output Figure E.7 AC Welding Output AC Welding Output Figure E.9 SCR Operation SCR Operation Thermal Protection 8THEORY of OPERATIONE-8Protection Circuits FAN-AS-NEEDED F.A.N Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING & REPAIRF-2 Troubleshooting & Repair Test Troubleshooting GuideProcedure Reconnect Transformer Control BoardSCR Bridge Test T1 Transformer Installed, remove it and replaceMachine functions normally Perform the Protection Board Protection Board See Note belowPerform the T1 Transformer Perform the SCR Bridge Test Perform the SCR Bridge Tests Perform the Gas Solenoid Test Est Electric Shock MaintenanceCan Kill High frequency transformer Maintenance Section To Technical Specifications Problems Possible AreasSymptoms Misadjustments Course of Action See the Maintenance Secti Stick electrode blasts-off Welding current may be too high Stick Welding Problems Function Problems Be plugged into J3 Installation Manual Display switch may be faulty Precision TIG Description 19TROUBLESHOOTING & REPAIRF-19Meter Calibration Adjustments Voltmeter/Ohmmeter Nut Driver Wiring Diagram Meter Calibration Adjustments 20TROUBLESHOOTING & REPAIRF-20Calibration Check Ammeter Calibration Procedure 21TROUBLESHOOTING & REPAIRF-21Control board. See Figure F1 Return to Section TOC High Frequency Circuit Disable Procedure 23TROUBLESHOOTING & REPAIRF-23Nut Driver Electrical Insulating Tape High Frequency Circuit Disable Procedure 24TROUBLESHOOTING & REPAIRF-24Procedure Protection Board Test 25TROUBLESHOOTING & REPAIRF-25Test Description Resistance Between Reading Protection Board Test T1 Main Transformer Test 27TROUBLESHOOTING & REPAIRF-27 Test Procedures 28TROUBLESHOOTING & REPAIRF-28T1 Main Transformer Test Primary Windings Test Points Acceptable Voltages Return to Section TOC GAS Water Solenoid Test 31TROUBLESHOOTING & REPAIRF-31 Perform the High Frequency Circuit Test ProcedureDisable Procedure GAS Water Solenoid Test Static SCR Test 33TROUBLESHOOTING & REPAIRF-33 Static SCR Test 34TROUBLESHOOTING & REPAIRF-34Removal and Replacement Assembly. See SCR Bridge Assembly Active SCR Test Service and repair Active SCR Test 36TROUBLESHOOTING & REPAIRF-36 Active SCR Test Figure F.9 SCR Gate Locations Typical Output Voltage Waveform Machine Loaded to 2 Amps 39TROUBLESHOOTING & REPAIRF-39DC TIG Mode Scope Settings Was loaded with a resistance grid bank 40TROUBLESHOOTING & REPAIRF-40AC TIG Mode Milliseconds in time. The machine Horizontal Sweep Ms/Div 41TROUBLESHOOTING & REPAIRF-41Typical AC Voltage Waveform Machine Loaded to 50 Amps This is the typical DC + output voltage Typical AC Voltage Waveform Machine Loaded to 2 Amps 42TROUBLESHOOTING & REPAIRF-42AC Balance Control in Auto Output Control AT Minimum 43TROUBLESHOOTING & REPAIRF-43 Return to Section TOC High Voltage Transformer Removal and Replacement 45TROUBLESHOOTING & REPAIRF-45Nut Driver Phillips Head Screwdriver Off-set Wire Cutters Replacement Procedure 46TROUBLESHOOTING & REPAIRF-46Removal and Replacement Removal Procedure Figure F.11 3/8 Screw & Leads S and F Locations 47TROUBLESHOOTING & REPAIRF-47 Return to Section TOC Control Board Removal and Replacement 49TROUBLESHOOTING & REPAIRF-49Nut Driver Phillips Head Screwdriver Wire Cutters Control Board Removal and Replacement 50TROUBLESHOOTING & REPAIRF-50 J10 J11 J12 51TROUBLESHOOTING & REPAIRF-51 Return to Section TOC SCR Bridge Assembly Removal and Replacement 53TROUBLESHOOTING & REPAIRF-53Nut Driver Pliers Crimp Wire Cutters SCR Bridge Assembly Removal and Replacement 54TROUBLESHOOTING & REPAIRF-54See Figure F.14 SCR Bridge Removal and Replacement Diode Stud Foot Inch Size Pounds Mounting of Stud Type Diodes to Aluminum Heat Sinks CONT’D25-27 300-324 10±.5 125+0/-5 22-25 Polarity Switch Removal and Replacement 57TROUBLESHOOTING & REPAIRF-57 Polarity Switch Removal and Replacement 58TROUBLESHOOTING & REPAIRF-58 SCR Removal and Replacement 59TROUBLESHOOTING & REPAIRF-59 SCR Removal and Replacement 60TROUBLESHOOTING & REPAIRF-60Special Instructions Recommended Meters for Machine Output Tests Retest After RepairInput Idle Amps Open Circuit Voltages Return to Section TOC Control P.C. Board Schematic Electrical Diagrams Section Section G Wiring Diagram Entire Machine Code 10806 G4031 Electrical Diagrams SCR2 Wiring Diagram Entire Machine Code 10807 G4031-1 Wiring Diagram Entire Machine Code 10893 G4031-2 Precision TIG 275 Wiring Diagram Precision TIG 275 Wiring Diagram Wiring Diagram Entire Machine Code 11158 G5692Schéma DE Câblage Diagramas DE Cableado Robotic Interface Connection Connexion Interface Robotique Wiring Diagram Entire Machine Code 11159 G5692-1 Return to Section Schematic Entire Machine below Code 11000 G4075 Change Detail Released from X A.02 Schematic Entire Machine Above Code 11000 G5691 Schematic Control PC Board below Code 11000 G3908 Electrical Diagrams Electrical Diagrams G3909 PC Board ASSEMBLY-CONTROL below Code 11000 G3909-2 Schematic Control PC Board Above Code 11000 G4762 Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams G4763 PC Board ASSEMBLY-CONTROL Above Code 11000 G4763-1 16115 M SCHEMATIC-PROTECTION P.C. Board M16115 Reqd Identification PC Board ASSEMBLY-PROTECTION M16062-1 SCHEMATIC-BYPASS / Stabilizer P.C. Board S22530-1 Code 10806 L10121-1 PC Board ASSEMBLY-BYPASS / Stabilizer L10121-1 Code 10806 Frame Ground SCHEMATIC-BYPASS and CE P. C. Board S24206 Code Bottom View PC Board ASSEMBLY-BYPASS and CE L10882-1 Code 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