Lincoln Electric SVM136-A service manual Blank

Page 59

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F-19

F-19

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER (T1) VOLTAGE TEST (continued)

FIGURE F.7 – PHASE ANGLE WINDINGS TEST POINTS AND TERMINAL STRIP LOCATION

21

 

 

4

 

 

2

14-PIN AMPHENOL

BLANK

 

 

31

 

K=42

32

 

A=32

J=31

 

75

B=GND

I=41

76

 

 

77

L

N

 

C=2

H=21

 

D=4

G=75

 

E=77

F=76

 

 

M

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12.Test for 115VAC between leads #31 and #32 on the terminal strip. Also test for 42VAC between pin K (lead #42) and pin I (lead 41) in the 14-pin amphenol. See Figure F.7.

a.Remove the sheet metal screws from the control box cover with the 5/16” nut driver and flip the cover down. It does not have to be completely removed to perform the tests.

b.If the above voltage checks are incor- rect, check for loose or faulty wiring. Check continuity.

c.If the wiring is good, then the main transformer may be faulty. Replace the main transformer.

13.Test with an AC voltmeter for 21VAC for each phase angle winding at plug P1 on the control board as shown in Figure F.8 and the accompanying table.

NOTE: If the main input supply voltage varies, the main transformer voltages will vary proportionately.

a.If the voltage is low, remove plug P1 and recheck the voltage for 21VAC. If the reading is normal, the control board may be faulty. Replace the control board.

b.If one or more of the voltage tests are incorrect, check for loose or faulty wiring.

c.If the wiring is good, then the main transformer may be faulty. Replace the main transformer.

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IDEALARC CV-400

Page 58 Page 60
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Page 58 Page 60
Contents Idealarc CV-400 California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Idealarc CV-400 InstallationLifting Safety PrecautionsLocation and Ventilation Input Supply Connections Ground ConnectionReturn to Input Wire and Fuse SizeConnect Electrode and Work Leads to Output Terminals Reconnect Procedure Output ConnectionsFigure A.5 Output Terminal Connections Connect Wire Feeders Table of Contents Operation Section Operating Instructions Safety InstructionsOperation Recommended Processes Operational Features and ControlsDesign Features General DescriptionLimitations Welding CapabilityFigure B.1 Case Front Controls Controls and SettingsLocal Control Remote ControlWelding Operation Overload Protection Auxiliary PowerIdealarc CV-400 Table of Contents Accessories Field Installed Options OPTIONS/ACCESSORIESFactory Installed Options Connecting the NA-3 to the Idealarc CV-400 Automatic Wire FeedersFeederterminal Connecting the NA-5 to the Idealarc CV-400Accessories Connecting the LN-7 to the Idealarc CV-400 Terminal Strip Semiautomatic Wire FeedersConnecting the LN-8 or LN-9 to the Idealarc CV-400 Idealarc CV-400 Table of Contents Maintenance Return to Return to Section TOC Safety Precautions Routine and Periodic MaintenanceFigure D.1 Idealarc CV-400 Table of Contents Theory of Operation Section Input Line VOLTAGE, Contactor and Main Transformer Theory of OperationOutput CONTROL, Rectification and Feedback Figure E.4 CV-400 Trigger and Thermal Light Circuit Protective Devices CircuitsFigure E.5 SCR Operation SCR OperationIdealarc CV-400 Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairElectric Shock can kill PC Board Troubleshooting ProceduresOutput Problems Troubleshooting GuideOutput Problems SCR/Diode Perform the SCR/Diode Bridge SCR/Diode Rectifier Bridge Test Welding Problems Materials Needed Control Transformer T2 Voltage TestDescription Control Transformer T2 Voltage Test Test ProcedureRight Side View Input Contactor Test Input Contactor Test Figure F.4 Input Contactor Test Connections Test for Contact ContinuityMain 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 Normal Open Circuit Voltage Waveform Maximum Output Setting no LoadTypical Output Voltage Waveform Machine Loaded Typical SCR Gate Voltage Waveform Maximum Output Setting no LoadONE Output SCR not Functioning Abnormal Output Voltage Waveform Machine LoadedDescription Input Contactor CR1 CLEANING/REPLACEMENTContactor Replacement Procedure Cleaning ProcedureFAN Motor and Blade Removal and Replacement Procedure FAN Motor and Blade Removal and ReplacementSCR/DIODE Rectifier Assembly Removal and Replacement Removal and Replacement SCR/DIODE Rectifier AssemblySCR Removal and Replacement SCR Removal and Replacement Figure F.21 1/2 Wide Leaf Spring Procedure for the 1/2 Inch Wide SpringClamping Procedure For 1/4-20 CAP Screws Clamping Procedure For 1/4-28 CAP ScrewsInch Wide Spring Procedure forAfter Replacing the SCRs Mounting of Stud Type Diodes To Aluminum Heat Sinks To Aluminum Heat Sinks Mounting of Stud Type DiodesMain Transformer Removal and Replacement Removal of Lift Bail Main Transformer Removal & ReplacementFigure F.26 Choke Removal Removal of Choke and TOP Iron AssemblyFigure F.27 Epoxy MIX Application Areas Reassembly of Transformer CoilsFigure F.28 Coil Lead Placement Figure F.30 Primary Thermostat Location Reassemble the Lift Bail Reassembling the Main Transformer Into the MachineWelding Output Load Test Retest After RepairInput Idle Amps and Watts Open Circuit VoltagesIdealarc CV-400 Section G Electrical DiagramsWiring 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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