Lincoln Electric SVM149-A service manual P2 P1

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F-22		TROUBLESHOOTING & REPAIR	F-22

MAIN INVERTER BOARD VOLTAGE TEST (CONTINUED)

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TEST PROCEDURE

1.Remove input power to the PRO-CUT 25 machine.

2.Remove carrying handle using a 4mm allen wrench.

3.Using a crescent wrench, carefully remove the plastic nut from around the

pressure regulator located on the top of the machine.

4.Using a 7mm nut driver, remove the case wraparound.

5.Perform the Capacitor Discharge Procedure detailed earlier in this section.

6.Visually check for burned or damaged components on the input board. If any components are physically damaged or determined to be faulty (except the fuse) the input board should be replaced.

7.Apply the correct input power to the Pro-Cut 25 machine. (115VAC or 230VAC)

8.Carefully test for approximately 300VDC at the P1 bridge terminals.

See Figure F.8. This represents the rectified voltage supplied from the input board. See the Wiring Diagram.

9.Carefully test for approximately 15VAC at the test points on bridge P2. This is the control supply voltage from the input board. See Figure F.8. See the Wiring Diagram.

10.Carefully test for 12VDC at test points C17. See Figure F.8. See Wiring Diagram. This is the rectified and regulated DC supply voltage for the inverter board control circuitry.

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Figure F.8. Test Points

P2 P1

	AC
	+
C18	+
C18
C17	+
	AC
LEAD 2 (NZL)
WRK	C19 C7
LEAD 3 (EL)	C19 C7
Plug J1
	Harness
	Plug

RIGHT SIDE OF MACHINE

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 K1756-1Safety Precautions Electric Shock can Kill Select Proper LocationHigh Frequency Interference Protection Input Electrical ConnectionsGAS Input Connections Output Connections TorchPRO-CUT Table of Contents Operation Section Safety Precautions Preheat Temperature for Plasma CuttingOperation DescriptionUser Responsibility Operational Features and ControlsDesign Features Advantages 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 Input Line VOLTAGE, and Auxiliary Transformer Theory of OperationGeneral Description 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 BoardAccidental Operation Protection Safety PARTS-IN-PLACE ProtectionProtection Circuits 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