Lincoln Electric SVM136-A service manual SCR/Diode Rectifier Bridge Test

Page 48

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F-8

TROUBLESHOOTING & REPAIR

 

F-8

 

 

 

Observe Safety Guidelines

 

 

 

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

The output terminals are

always

1. Remove any external leads that

1. Check for an internal short

electrically “hot.”

 

may be connected to the 14 pin

between leads #2 and #4. See

 

 

amphenol or the terminal strip.

the Wiring Diagram.

 

 

 

If the

problem disappears, the

2. Remove plug J3

(SCR gate

 

 

fault

is in the control cable or

 

 

leads) from the control board. If

 

 

wire feeder.

 

 

the

problem disappears, the

 

 

 

 

 

 

 

 

control board may be faulty.

 

 

 

 

Replace. If the output terminals

 

 

 

 

are still electrically “hot,” perform

 

 

 

 

the

SCR/Diode

Rectifier

 

 

 

 

Bridge Test.

 

 

 

 

 

3. The snubber board may be

 

 

 

 

faulty. Check or replace.

 

 

 

 

 

 

 

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 216-383-2531 or 1-800-833-9353.

IDEALARC CV-400

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Contents Idealarc CV-400 Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Idealarc CV-400Safety Precautions Location and VentilationLifting Ground Connection Input Supply ConnectionsInput Wire and Fuse Size Return toReconnect Procedure Output Connections Connect Electrode and Work Leads to Output TerminalsFigure A.5 Output Terminal Connections Connect Wire Feeders Table of Contents Operation Section Safety Instructions OperationOperating Instructions Operational Features and Controls Design FeaturesGeneral Description Recommended ProcessesWelding Capability LimitationsControls and Settings Figure B.1 Case Front ControlsRemote Control Welding OperationLocal Control Auxiliary Power Overload ProtectionIdealarc CV-400 Table of Contents Accessories OPTIONS/ACCESSORIES Factory Installed OptionsField Installed Options Automatic Wire Feeders Connecting the NA-3 to the Idealarc CV-400Connecting the NA-5 to the Idealarc CV-400 FeederterminalAccessories Semiautomatic Wire Feeders Connecting the LN-7 to the Idealarc CV-400 Terminal StripConnecting the LN-8 or LN-9 to the Idealarc CV-400 Idealarc CV-400 Table of Contents Maintenance Safety Precautions Routine and Periodic Maintenance Return to Return to Section TOCFigure D.1 Idealarc CV-400 Table of Contents Theory of Operation Section Theory of Operation Input Line VOLTAGE, Contactor and Main TransformerOutput CONTROL, Rectification and Feedback Protective Devices Circuits Figure E.4 CV-400 Trigger and Thermal Light CircuitSCR Operation Figure E.5 SCR OperationIdealarc CV-400 Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Electric Shock can killTroubleshooting Guide Output ProblemsOutput Problems SCR/Diode Perform the SCR/Diode Bridge SCR/Diode Rectifier Bridge Test Welding Problems Control Transformer T2 Voltage Test DescriptionMaterials Needed Test Procedure Control Transformer T2 Voltage TestRight Side View Input Contactor Test Input Contactor Test Test for Contact Continuity Figure F.4 Input Contactor Test ConnectionsMain Transformer T1 Voltage Test Main Transformer T1 Voltage Test Figure F.6 Main Secondary Lead Test Points Blank Main Transformer T1 Voltage Test Static SCR/DIODE Rectifier Bridge Test Static SCR/DIODE Rectifier Bridge Test SCR Anode Remove ANY Insulating Paint Cathode SCR Active SCR Test Active SCR Test Figure F.15 Heat Sink Test Points Figure F.16 SCR Tester Circuit and SCR Connections Maximum Output Setting no Load Normal Open Circuit Voltage WaveformTypical Output Voltage Waveform Machine Loaded Maximum Output Setting no Load Typical SCR Gate Voltage WaveformAbnormal Output Voltage Waveform Machine Loaded ONE Output SCR not FunctioningInput Contactor CR1 CLEANING/REPLACEMENT DescriptionCleaning Procedure Contactor Replacement ProcedureFAN Motor and Blade Removal and Replacement FAN Motor and Blade Removal and Replacement ProcedureSCR/DIODE Rectifier Assembly Removal and Replacement SCR/DIODE Rectifier Assembly Removal and ReplacementSCR Removal and Replacement SCR Removal and Replacement Procedure for the 1/2 Inch Wide Spring Figure F.21 1/2 Wide Leaf SpringClamping Procedure For 1/4-28 CAP Screws Clamping Procedure For 1/4-20 CAP ScrewsProcedure for Inch Wide SpringAfter Replacing the SCRs Mounting of Stud Type Diodes To Aluminum Heat Sinks Mounting of Stud Type Diodes To Aluminum Heat SinksMain Transformer Removal and Replacement Main Transformer Removal & Replacement Removal of Lift BailRemoval of Choke and TOP Iron Assembly Figure F.26 Choke RemovalReassembly of Transformer Coils Figure F.27 Epoxy MIX Application AreasFigure F.28 Coil Lead Placement Figure F.30 Primary Thermostat Location Reassembling the Main Transformer Into the Machine Reassemble the Lift BailRetest After Repair Input Idle Amps and WattsOpen Circuit Voltages Welding Output Load TestIdealarc CV-400 Electrical Diagrams Section GWiring Diagram Codes 10084, 10085 Wiring Diagram Code Control PC Board G2629-1 Layout Control PC Board G2629-1 Schematic Snubber Snubber PC Board M15370-3 Schematic Idealarc CV-400
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