Output Rectification, See SCR Operation | Lincoln Electric SVM162-B

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E-3	THEORY OF OPERATION	E-3
	FIGURE E.3 – OUTPUT RECTIFICATION, CONTROL BOARD AND FEEDBACK

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FROM

CONTROL

BOARD

OPTIONAL POWER

CORRECTIONFACTOR

CAPACITORS

POWER

BACKGROUND

CIRCUIT

63.5 VAC

REAR GANG	WORK

POLARITY

SWITCH

BYPASS BOARD

FRONT ELECTRODE

HIGH FREQUENCY

SWITCH

PANEL

RECONNECT

X1

VAC78 X2

AC	DC	CHOKE
AC	DC
	SCR
BRIDGE
AC	DC	SHUNT

TRANSFORMER

HIGH VOLTAGE TRANSFORMER

REAR ELECTRODE

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115 VAC

GAS

VAC

FAN

THERMOSTAT

LEADSGATE FEEDBACK

SOLENOID

115

115 VAC

VAC

VAC

115

115

20 VAC

CONTROL BOARD

THERMOSTAT

20 VAC

ADVANCED CONTROL

LED's

MINIMUM

PANEL RECEPTACLE

OUTPUT

CONTROL

PROTECTION

METER

STICK

BOARD

TIG

SWITCH

BALANCE

POST

LOCAL/REMOTE

MAXIMUM

CONTROL

FLOW

SWITCH

OUTPUT

REMOTE

CONTROL

OUTPUT RECTIFICATION,

RECEPTACLE

CONTROL BOARD AND FEEDBACK

The control board also monitors the thermostats and

The AC output from the main transformer secondary

is rectified and controlled through the SCR bridge.

controls the gas solenoid, the thermal light, the high

Output current is sensed at the shunt as a low voltage

voltage transformer and the cooling fan. The optional

signal and fed back to the control board. The control

advanced control panel also plugs into and interfaces

board senses the status and settings of the various

with the control board.

operator controls such as the Stick/TIG switch, the

output controls, the remote control receptacle, the

local/remote switch, the balance control and the post-

flow control. Circuitry on the control board evaluates

these commands, compares them to the feedback

information received from the shunt and sends the

appropriate gate firing signals to the output SCR

bridge. The control board regulates the firing of the

output SCRs, which control the output of the machine.

See SCR Operation.

PRECISION TIG 275

Image 41

Lincoln Electric SVM162-B Output Rectification, Control board also monitors the thermostats, See SCR Operation

Contents

Precision TIG Safety Depends on You Powered equipment SafetyFor Engine Mar ʻ95 Aug ʻ06 ARC Rays can burnFumes and Gases Iii Welding Sparks canCylinder may explode If damaged Précautions DE Sûreté Pour Précautions DE SûretéLES Machines À Souder À Transformateur ET À Master Table of Contents for ALL Sections Table of Contents Installation Section Unbalance 70% Penetration AC TIG 16.1 255 60% 29.0 225 InstallationUnbalance 70% Penetration AC TIG 15.4 200 100% 28.0 Unbalance 70% Penetration AC TIG 14.8 150 Maximum Open Output Current Select Suitable Location Safety PrecautionsProtection Disconnect switch or fuse box Turn the input power OFF atBefore working on this equip Ment 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 Pipe Thawing OperationProduct Description Equipment Recommended Processes When the Power Source is on Controls and SettingsStick mode the Electrode circuits Both the Stick and TIG torch cables Maximum Output Control The large knob AC Balance Ontrol TIG Mode Menu Menu Button and Display Switch CodesOperation for Codes Above 11000 only Select Gure B.3 Advanced Panel Controls Pulse Background Current Control Pulse Frequency ControlTime Control PULSE% on Stick Welding Features Internal SET UP ControlsTIG 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 Recommended Electrode Amperage Ranges Precision TIG Making a TIG Weld with AN AmptrolSmaw Process Gtaw Process Table of Contents Magnum PTA and PTW Series Torches Accessories for Codes belowOptional Equipment Accessories for Codes Above Return to Section TOC Component Location and Access Maintenance Overload Protection Safety Precautions UNDER-COOLER Service Service ProceduresSpark GAP Adjustment Warni Table of Contents Theory of Operation Section General Description Input Power CircuitTheory of Operation See SCR Operation Output RectificationControl board also monitors the thermostats 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 Protection Circuits 8THEORY of OPERATIONE-8FAN-AS-NEEDED F.A.N Thermal Protection Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING & REPAIRF-2 Troubleshooting & Repair Procedure Troubleshooting GuideReconnect Test SCR Bridge Test Control BoardTransformer Machine functions normally Installed, remove it and replacePerform the Protection Board T1 Transformer Perform the T1 Transformer See Note belowProtection Board Perform the SCR Bridge Test Perform the SCR Bridge Tests Perform the Gas Solenoid Test Est Can Kill MaintenanceElectric Shock High frequency transformer Maintenance Section Symptoms Misadjustments Course of Action Problems Possible AreasSee the Maintenance Secti To Technical Specifications 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 Meter Calibration Adjustments 19TROUBLESHOOTING & REPAIRF-19Voltmeter/Ohmmeter Nut Driver Wiring Diagram Description Calibration Check 20TROUBLESHOOTING & REPAIRF-20Meter Calibration Adjustments Control board. See Figure F1 21TROUBLESHOOTING & REPAIRF-21Ammeter Calibration Procedure Return to Section TOC Nut Driver Electrical Insulating Tape 23TROUBLESHOOTING & REPAIRF-23High Frequency Circuit Disable Procedure Procedure 24TROUBLESHOOTING & REPAIRF-24High Frequency Circuit Disable Procedure Test Description 25TROUBLESHOOTING & REPAIRF-25Protection Board Test Resistance Between Reading Protection Board Test T1 Main Transformer Test 27TROUBLESHOOTING & REPAIRF-27 T1 Main Transformer Test 28TROUBLESHOOTING & REPAIRF-28Test Procedures Primary Windings Test Points Acceptable Voltages Return to Section TOC GAS Water Solenoid Test 31TROUBLESHOOTING & REPAIRF-31 Disable Procedure Test ProcedureGAS Water Solenoid Test Perform the High Frequency Circuit Static SCR Test 33TROUBLESHOOTING & REPAIRF-33 Removal and Replacement 34TROUBLESHOOTING & REPAIRF-34Assembly. See SCR Bridge Assembly Static SCR Test Active SCR Test Service and repair Active SCR Test 36TROUBLESHOOTING & REPAIRF-36 Active SCR Test Figure F.9 SCR Gate Locations DC TIG Mode 39TROUBLESHOOTING & REPAIRF-39Scope Settings Typical Output Voltage Waveform Machine Loaded to 2 Amps AC TIG Mode 40TROUBLESHOOTING & REPAIRF-40Milliseconds in time. The machine Was loaded with a resistance grid bank Typical AC Voltage Waveform Machine Loaded to 50 Amps 41TROUBLESHOOTING & REPAIRF-41This is the typical DC + output voltage Horizontal Sweep Ms/Div AC Balance Control in Auto Output Control AT Minimum 42TROUBLESHOOTING & REPAIRF-42Typical AC Voltage Waveform Machine Loaded to 2 Amps 43TROUBLESHOOTING & REPAIRF-43 Return to Section TOC Nut Driver Phillips Head Screwdriver Off-set Wire Cutters 45TROUBLESHOOTING & REPAIRF-45High Voltage Transformer Removal and Replacement Removal and Replacement 46TROUBLESHOOTING & REPAIRF-46Removal Procedure Replacement Procedure Figure F.11 3/8 Screw & Leads S and F Locations 47TROUBLESHOOTING & REPAIRF-47 Return to Section TOC Nut Driver Phillips Head Screwdriver Wire Cutters 49TROUBLESHOOTING & REPAIRF-49Control Board Removal and Replacement Control Board Removal and Replacement 50TROUBLESHOOTING & REPAIRF-50 J10 J11 J12 51TROUBLESHOOTING & REPAIRF-51 Return to Section TOC Nut Driver Pliers Crimp Wire Cutters 53TROUBLESHOOTING & REPAIRF-53SCR Bridge Assembly Removal and Replacement See Figure F.14 54TROUBLESHOOTING & REPAIRF-54SCR Bridge Assembly Removal and Replacement SCR Bridge Removal and Replacement 25-27 300-324 10±.5 125+0/-5 22-25 Mounting of Stud Type Diodes to Aluminum Heat Sinks CONT’DDiode Stud Foot Inch Size Pounds Polarity Switch Removal and Replacement 57TROUBLESHOOTING & REPAIRF-57 Polarity Switch Removal and Replacement 58TROUBLESHOOTING & REPAIRF-58 SCR Removal and Replacement 59TROUBLESHOOTING & REPAIRF-59 Special Instructions 60TROUBLESHOOTING & REPAIRF-60SCR Removal and Replacement Input Idle Amps Retest After RepairOpen Circuit Voltages Recommended Meters for Machine Output Tests 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 Schéma DE Câblage Diagramas DE Cableado Wiring Diagram Entire Machine Code 11158 G5692Precision TIG 275 Wiring Diagram 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