Lincoln Electric CV-250 Output Voltage, Fault Protection Operation, Checking Snubber Circuit

Page 27

E-8

TROUBLESHOOTING

E-8

 

 

 

OUTPUT VOLTAGE

The open circuit voltage of the machine should be 10 to 43 volts. If any other condition exists, refer to the Troubleshooting Guide.

FAULT PROTECTION OPERATION

The overload protection circuit on the PC Board will cause the CV-250 meter to display "E60". This pro- tection circuit will reset itself automatically. The short circuit protection circuit will cause the meter to display "E00". The CV-250 power switch must be turned "OFF" and then "ON" to return the machine to normal output.

CHECKING SNUBBER CIRCUIT

In case of an SCR malfunction or failure, the snubber assembly should be checked. Disconnect the input power to the CV-250 at the fuse box and remove the right side of the machine.

1.Visually inspect the snubber PC Board assembly (located below the Control PC board on the case front for overheated components or damaged compo- nents).

OPTIONAL K857 REMOTE CONTROL

CHECK

Disconnect the remote output control and connect an ohm- meter between pins C and B and rotate the rheostat in the remote control. The resistance reading should go from zero to 10K ohms. Repeat with ohmmeter across A and B with the same results. Connect ohmmeter across A and C. The reading should be 10K ohms. A lower reading will indicate a shorted or partially shorted rheostat. A very high reading will indicate an open rheostat. In either of the last two cases, replace the rheostat.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

CV-250

Page 26 Page 28
Image 27
Page 26 Page 28
Contents Idealarc Safety Depends on YouCalifornia Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Technical Specifications Idealarc CV-250 InstallationStacking Safety PrecautionsSelect Suitable Location Input ConnectionsOutput Connections Field Installed OptionsParalleling Operation Operating InstructionsGeneral Warnings General Description Operational Features and ControlsDesign Features Power Source OperationThermal Protection Indication Light Controls and SettingsVoltage Control Indicates Warning Information Located on Right Case SideOutput Panel Connections C. Output ConnectorsAuxiliary Power Starting the MachineOverload Protection Accessories Factory Installed OPTIONS/ACCESSORIESCompatible Lincoln Equipment Machine and Circuit Protection MaintenanceGeneral Maintenance Safety PrecautionsHOW to USE Troubleshooting Guide 1TROUBLESHOOTINGE-1Troubleshooting BUILT-IN Diagnostic Routines and Error CodesError Code Trouble Remedy Problems Machine Troubleshooting GuidePossible Areas Recommended Symptoms Poor arc striking with semiautomatic Poor work connection Options Troubleshooting Guide Meter PC Board Control PC BoardChecking Snubber Circuit Fault Protection OperationOptional K857 Remote Control Check Output VoltageWiring Diagram CV 250 60Hz CV Power Source to AN LN-7 and K857 DiagramsAdapter Source to a K867Power Source to a K867 / K775 / LN 250 CV Power Source to AN LN-25CV Power Source to AN LN-25 / K444-1 Lincoln Power Source PIN Amphenol Installation Instructions TWIST-MATE Cable Plug Installation Instructions Connection of NON-LINCOLN Wire Feeders Dimension Print $700.00 How To Read Shop DrawingsPrecaucion Warnung
Top Page Image Contents