Lincoln Electric SVM151-A Analog Control Power Supply Board Test, See the Digital Meter Calibra

Page 48

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F-8

 

 

 

 

F-8

TROUBLESHOOTING & REPAIR

 

 

 

Observe Safety Guidelines

 

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

FUNCTION PROBLEMS

 

 

 

 

 

The meters do not light in either CV

1. In the CC mode, only the AMPS

1.

Check all the plug connections

or CC modes.

meter will light. In the CV mode,

 

to the Weld Control Board for

 

only the VOLTS meter will light.

 

loose or faulty connections.

 

 

 

See the Wiring Diagram.

 

 

2.

Check the leads and connec-

 

 

 

tions between the meters and

 

 

 

the Weld Control Board. See

 

 

 

the Wiring Diagram.

 

 

 

 

3.

Perform the

Analog

Control

 

 

 

Power Supply Board Test.

 

 

4.

The meters may be faulty.

 

 

5.

The Weld Control Board may be

 

 

 

faulty. Replace.

 

 

 

 

 

 

 

 

 

One or both of the meter’s readings

1. Make sure the test or external

1.

Check shunt

feedback

leads

are not accurate.

meter is reliable and accurate.

 

R326, 327, R226, 227, plugs

 

 

 

P21 and P6 for loose or faulty

 

 

 

connections.

See the Wiring

 

 

 

Diagram.

 

 

 

 

 

2.

Check the integrity of lead 237

 

 

 

at plug P12 on the Weld Control

 

 

 

Board and also at plug P31 on

 

 

 

the Peripheral Board.

 

 

 

 

3.

See the Digital Meter Calibra-

 

 

 

tion and Adjustment Test in

 

 

 

the Maintenance section.

 

 

4.

Perform the

Analog

Control

 

 

 

Power Supply Board Test.

 

 

5.

The Weld Control Board may be

 

 

 

faulty. Replace.

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

MULTI-WELD 350

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Contents Multi-Weld TM 350 Arc Converter Safety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications MULTI-WELD 350 K1735-1Safety Precautions QUICK-CONNECT PIG-TAILSWork Connection Case GroundingFixed Parallel Operation Power Source Setup Converters Cable Size On Cable AWG mm2Table of Contents Operation Section Safety Instructions OperationOperating Instructions Product Description VersatilePortable MULTI-SYSTEM Power Source PIG-TAIL Leads and ConnectorsRecommended Equipment and Processes Distribution BOXCV Mode Wire Welding CC Mode Stick Welding and GougingRemote Output Control Options Input Power/ Mode Switch has three positions Front Panel ControlsRecessed Panel Controls For CC STICK/GOUGE Mode only Paralleled ConvertersTransporting and Storage of the MULTI-WELD Cable HandlingProtection Features MULTI-WELD Table of Contents Accessories Section Accessories OPTIONS/ACCESSORIESSemiautomatic Welding Accessories Connection of Lincoln Electric Wire FeedersTo Work MULTI-WELD Table of Contents Maintenance SectionSection D-1 Maintenance MaintenanceSee additional warning information throughout this manual Service Figure D.2 Major Component LocationsMULTI-WELD Table of Contents Theory of Operation Section Theory of Operation General DescriptionPower Modules and FEED- Back Figure E.3 Power Modules and FeedbackAnalog Control Power Supply Board and Weld Control Board Mode Selector and Output Controls Figure E.5 Mode Selector and Output ControlsOVER-VOLTAGE Protection Insulated Gate Bipolar Transistor Igbt Operation Pulse Width Modulation 8E-8Chopper Technology Fundamentals 70-80VDCMULTI-WELD Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures PC Board can be damaged by static electricityTroubleshooting Guide Power Supply Board TestPerform the DC Buss Supply Board TestSpecifications Perform the Input ContactorCoil Resistance and Supply Voltage TestInput Voltage and Resistance TestFunction Problems Analog Control Power Supply Board Test Tion and Adjustment TestSee the Digital Meter Calibra Perform the DC Buss Supply Welding Problems Troubleshooting & Repair Troubleshooting & Repair Case Cover Assembly Removal Replacement Procedure Test DescriptionMaterials Needed Removal Procedure Replacement ProcedurePower Module Capacitor Discharge Procedure Procedure Figure F.2 Power Module Capacitor Terminal DischargeInput Contactor Coil Resistance and Supply Voltage Test Coil Test Procedure Perform the Power Module Capacitor Discharge procedureInput Contactor Coil Resistance Supply Voltage Test Leads #303A #330Test for Contact Continuity Supply PC Board TestAnalog Control Power Supply PC Board Test Test Procedure Figure F.4 Analog Control Power Supply PC BoardPower Supply PC Board Test DC Buss Power Supply PC Board Test DC Buss Power Supply PC Board P46 P47Table F.2 DC Buss Power Supply PC Board Voltage Table Chopper PC Board Input Voltages and Resistance Test Figure F.6 Power Module Assembly Details Chopper PC Board Input Voltages Resistance TestTest Procedure for the Left Side Power Module Power Module Capacitor Discharge ProcedureCC Mode Input Voltage Applied 75 VDC Scope SettingsNormal Open Circuit Voltage Waveform CV Mode Output Control AT Maximum Machine Loaded to 350 Amps AT 34 Volts CC-STICK Mode Normal Weld Voltage WaveformMachine Loaded to 350 Amps AT 34 Volts CV Mode CV Mode Output Control AT Minimum Case Front Assembly Removal and Replacement DescriptionReplace the case cover Weld Control or Peripheral PC Board Removal and Replacement Figure F.8 Case Front Assembly Details Replacement Procedure Description Digital Meter Removal Procedure Lens Bezel Spacer Seal KnobOutput Control Potentiometer Removal Procedure Refer to Figure F.9Input Contactor Removal and Replacement Figure F.10 Input Contactor Assembly Details Lead #331Replacement Procedure Input Diode Removal and Replacement Figure F.11 Input Diode Assembly Details 25-27 300-324 Refer to Figure F.11FAN Motor Assembly Removal and Replacement Figure F.12 FAN Motor Assembly Details Perform the Input Diode Replacement procedure Perform the Input Diode Removal proce- durePower Capacitor Removal and Replacement Figure F.13 Power Capacitor Mounting Details Reassembly Chopper PC Board and Diode Module Removal and Replacement Chopper PC Board Removal and Replacement RemovalReplacement Refer to Figure F.14Diode Module Removal and Replacement Figure F.15 Diode Module Mounting DetailsRefer to Figure F.15 Figure F.16 Diode Module Tightening Sequence Retest After Repair Idle AmpsOpen Circuit Voltages Load TestElectrical Diagrams Table of Contents Electrical Diagrams SectionMULTI-WELD 350 Wiring Diagram Wiring Diagram MULTI-WELDSchematic Control PC Board #1 Schematic Control PC Board #2 Schematic Control PC Board #3 Schematic Control PC Board #4 Schematic Control PC Board #5 PC Board ASSEMBLY-CONTROL RESISTOR,SMD,1W,243OHMS,1%Schematic Peripheral Printed Circuit Board PC Board ASSEMBLY-PERIPHERAL PC Board Reference Description DesignatorsSchematic Power Printed Circuit Board PC Board ASSEMBLY-POWER Return to Section Return to Section TOC To Section TOCSchematic Analog Printed Circuit Board PC Board ASSEMBLY-ANALOG Schematic BY-PASS Printed Circuit Board PC Board Assembly BY-PASS Schematic Chopper Printed Circuit Board 19303 MPC Board Assembly Chopper SVM Error Reporting Form