Lincoln Electric R3R 375-I Power Silicon Controlled REC- Tifier Test, Diagram Power Diode Test

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E-10

TROUBLESHOOTING

E-10

 

 

 

DIAGRAM 1

DIAGRAM 2

2.POWER DIODE TEST

K. POWER SILICON CONTROLLED REC- TIFIER TEST

a.Establish the polarity of the ohmmeter leads and set to X10 scale.

b.Connect the ohmmeter positive lead to anode and negative lead to the cathode.

c.Reverse the leads of the ohmmeter from Step b.

d.A shorted diode will indicate zero or an equal- ly low resistance in both directions. An open diode will have an infinite or high resistance in both directions, and a good diode will have a low resistance in Step b and a much higher resistance in Step c.

The SCR must be mounted in the heat sink when making this test.

a. Connect the ohmmeter (set to the X10 scale) leads to the anode and cathode.

b.Reverse the leads of the ohmmeter from Step a.

c.A shorted SCR will indicate zero or an equally low resistance in one or both directions.

d.Establish the polarity of the ohmmeter. Connect the positive lead to the gate and the negative lead to the cathode.

e.An open gate circuit will have an infinite or high resistance. A good gate circuit will read a low resistance, but not zero ohms.

IDEALARC® R3R 375-I, 500-I AND 600-I

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Contents R3R 375-I, 500-I Safety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion Précautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Table of Contents Input Power Connection InstallationInstallation Duty CycleOperation ARC Force Control Dial Output Current Control MACHINE- Remote SwitchHigh Temperature Warning Light Output Current Control DialK857 Remote Current Control AccessoriesOptional Equipment K817, K817R UndercarriagePower Rectifier Replacement MaintenanceRoutine Maintenance Pocket AmptrolTroubleshooting HOW to USE Troubleshooting GuideRecommended Function Problems Troubleshooting Troubleshooting Problems Possible Cause Recommended R3R 375Troubleshooting Procedures Checking Snubber CircuitChecking Current Control Rheostat on Machine Power Silicon Controlled REC- Tifier Test Diagram Power Diode TestWiring Diagrams Idealarc R3R-400, 500-I, 500 & 600-I Wiring DiagramWiring Diagrams R3R 375-I, 500-I K817 or K817R Precaucion Aviso DE
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