Lincoln Electric SVM149-A service manual LED Function Problems

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F-8		TROUBLESHOOTING & REPAIR				F-8

	Observe Safety Guidelines			TROUBLESHOOTING GUIDE
	detailed in the beginning of this manual.

	PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)		COURSE OF ACTION

		LED FUNCTION PROBLEMS
	The Thermal LED is lit after normal 1. One of the machine’s		thermal	1.	Check all connectors and wires
	use.	protection circuits has	tripped.		for loose or faulty connections.
		Do not turn the PRO-CUT 25 off.			See Wiring Diagram.
		Allow the machine to cool. The		2.	The inverter board may	be
		thermal protection circuits will		2.	The inverter board may	be
		thermal protection circuits will			faulty. Replace.
		reset themselves.			faulty. Replace.
		reset themselves.
		2. Either the duty cycle has been		3. The control board may be faulty.
		2. Either the duty cycle has been			Replace.
		exceeded, the fan is not func-			Replace.
		exceeded, the fan is not func-
		tioning, or the louvers are		4.	Use the correct extension cord.
		blocked.			See the instruction manual.

3.Thermo light comes on when over voltage occurs +/-10% must be with in 10%.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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 DescriptionOperational Features and Controls Design Features AdvantagesUser 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 Theory of Operation General DescriptionInput 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 BoardSafety PARTS-IN-PLACE Protection Protection CircuitsAccidental 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