Lincoln Electric SVM149-A service manual Retest After Repair, Machine Input and Output

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F-48

TROUBLESHOOTING & REPAIR

F-48

 

 

 

RETEST AFTER REPAIR

Should a machine under test be rejected for any reason requiring the removal of any mechanical part that could affect the machine’s electrical characteristics, or if any electrical components are repaired or replaced, the machine must be retested.

Machine Input and Output

 

 

Input Volts/Hertz

 

Input Current

 

Rated Output

 

 

 

 

 

 

 

 

 

 

 

230/1/60HZ

 

15 Amps

 

20A @ 100% Duty Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Current Range

 

 

12 - 25 Amps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Open Circuit Voltage

 

 

400 Volts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pilot Current

 

 

 

12 amps

 

 

 

 

 

 

 

 

 

Functional Test

1.Connect the machine to 230VAC and an air supply (70psi minimum).

2.Turn on the machine and verify the following:

-When the machine is turned on the Thermal LED turns on for approximately 1 second.

-The fan is functional.

-The power LED is lit.

3.Test the pressure switch in the following way:

-Press and hold the Purge button on the front of the machine. Using the regulator on the machine, slowly lower the air pressure and verify that the gas pressure LED turns on at approximately 35 to 40 psi.

-With the gas pressure LED on, release the Purge button and then pull the trigger on the torch. Verify that a pilot arc does NOT occur. Release the trigger.

-While again pressing the Purge button, slowly increase the air pressure using the regulator on the machine until the gas pressure LED turns off. Verify that the LED turns off at approximately 40-45 psi.

-Continue to press the Purge button and set the air pressure at 65psi. Release the Purge button.

4.Test the Purge button safety function by again pressing the Purge button and then pulling the trigger on the torch. Verify that a pilot arc does NOT occur. Release the trigger and the Purge button. (This is not a repeat of the previous step, in this step the Purge button is pressed and the gas pressure LED is off.)

5.With no air flowing (postflow), pull the trigger on the torch. Verify that the air flows for 2 seconds (preflow) and then the pilot arc is initiated. While continuing to hold the trigger, verify that the pilot arc remains lit for 3 seconds then turns off automatically. Release the trigger and verify that the air continues to flow for 10 seconds (postflow).

6.Remove the shield cup from the torch and verify that the safety LED turns on. Re-tighten the shield cup on the torch and verify that the safety LED remains lit. Pull the trigger of the torch and verify that a pilot arc does NOT occur. Turn the machine off and then back on to clear the safety error.

7.Turn the PRO-CUT 25 off.

PRO-CUT 25

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Contents PRO-CUT Safety Cylinder may explode if damaged Safety Précautions DE SûretéMaster Table of Contents for ALL Sections PRO-CUT Table of Contents Installation SectionInstallation Technical Specifications PRO-CUT 25 K1756-1High Frequency Interference Protection Safety Precautions Electric Shock can KillSelect Proper Location Input Electrical ConnectionsGAS Input Connections Output Connections TorchPRO-CUT Table of Contents Operation Section Operation Safety PrecautionsPreheat Temperature for Plasma Cutting DescriptionDesign Features Advantages Operational Features and ControlsUser Responsibility Cutting Capability Consumable LifeControls and Settings LimitationsApparently wrong, reset the machine by turning Pilot ARC DiscussionProcedure Recommendations General In All CasesPRO-CUT Accessories General Options Accessories Maintenance Routine Maintenance Electric Shock can killPRO CUT PRO-CUT Table of Contents Theory of Operation Section General Description Theory of OperationInput Line VOLTAGE, and Auxiliary Transformer Precharge and Protection Figure E.3 Precharge and ProtectionMain Transformer Return Return to Section TOCFigure E.5 Plasma Output Section and Torch Control Board Figure E.6 Control BoardProtection Circuits Safety PARTS-IN-PLACE ProtectionAccidental Operation Protection Insulated Gate Bipolar Transistor Igbt Operation Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Output Problems Function Problems See the Operation section Troubleshooting & Repair LED Function Problems Input Filter Capacitor Discharge Procedure DescriptionDischarge Procedure Right Side of MachineMain Inverter Board Resistance Test Right Side of Machine IGBT’s D2 D1 D11 D10 PRO-CUT Input Board Voltage Test Test Points Fan PRO-CUT Main Inverter Board Voltage Test P2 P1 P2 P1 PRO-CUT Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test PRO-CUT AIR/GAS Solenoid Test AIR/GAS Solenoid Test Control Board Removal and Replacement Small Red Cap Screws Over tighten Input Board Removal and Replacement Input Board Input Board Removal & Replacement PRO-CUT Main Inverter Board Removal and Replacement Main Board Main Inverter Board Removal & Replacement PRO-CUT Switch Removal and Replacement PRO FAN Removal and Replacement Fan Do Not Over tighten Retest After Repair Machine Input and OutputElectrical Diagrams Table of Contents Electrical Diagrams SectionInput Voltage Board Pressure SCHEMATIC- Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Main Inverter Board PC Board Assembly Input Board Cutting Current Path SVM Error Reporting Form
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