Lincoln Electric SVM149-A service manual Cutting Current Path

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Master TOC

G-9	ELECTRICAL DIAGRAMS	G-9
PC 25 TORCH DETAILS

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Spring is relaxed

helping the push

VENT

5%

AIR IS FLOWING & ELECTRODE SOL. IS “ON”.

ELECTRODE SOL. ENERGIZED

(surface area is great)

Cup “O” rings must be good. electrode is held to the nozzle.

Spring is compressed

Air pressure pushes back electrode creating a “LIFT” start feature inside the nozzle for a pilot arc

COMPRESSED AIR INPUT

%= AIR FLOW

75%

20%

VERY LITTLE

COMPRESSED AIR FLOWING

at tip.

1.No Compressed air flowing

2.Air is flowing & torch solenoid is

“ON”

HOLDS ELECTRODE TO NOZZLE

CHAMBER FULL OF

COMPRESSED AIR

BRASS CONDUCTOR			ELECTRODE
BRASS CONDUCTOR
WITH A VENT						NOZZLE

PILOT CURRENT PATH

AIR TUBE (COPPER)

work

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ELECTRODE SOL.

DE-ENERGIZED

VENT

COMPRESSED AIR INPUT

	Air Flowing & Torch Solenoid is					CUTTING CURRENT PATH
			“OFF”			CUTTING CURRENT PATH
			PILOT & CUTTING			through plasma arc and yellow color parts
			PILOT & CUTTING
	Lift		start type feature during	pilot		CURRENT PATH THROUGH TORCH
		COMPRESSED AIR FLOW				CURRENT PATH THROUGH TORCH
		COMPRESSED AIR FLOW

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NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.

PRO-CUT 25

Image 91

Contents PRO-CUT Safety Cylinder may explode if damaged Précautions DE Sûreté SafetyMaster Table of Contents for ALL Sections PRO-CUT Installation Section Table of ContentsTechnical Specifications PRO-CUT 25 K1756-1 InstallationInput Electrical Connections Safety Precautions Electric Shock can KillSelect Proper Location High Frequency Interference ProtectionGAS Input Connections Torch Output ConnectionsPRO-CUT Table of Contents Operation Section Description Safety PrecautionsPreheat Temperature for Plasma Cutting OperationDesign Features Advantages Operational Features and ControlsUser Responsibility Consumable Life Cutting CapabilityLimitations Controls and SettingsPilot ARC Discussion Apparently wrong, reset the machine by turningGeneral In All Cases Procedure RecommendationsPRO-CUT Accessories General Options Accessories Maintenance Electric Shock can kill Routine MaintenancePRO CUT PRO-CUT Table of Contents Theory of Operation Section General Description Theory of OperationInput Line VOLTAGE, and Auxiliary Transformer Figure E.3 Precharge and Protection Precharge and ProtectionReturn Return to Section TOC Main TransformerFigure E.5 Plasma Output Section and Torch Figure E.6 Control Board Control BoardProtection Circuits Safety PARTS-IN-PLACE ProtectionAccidental Operation Protection Insulated Gate Bipolar Transistor Igbt Operation Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Output Problems Function Problems See the Operation section Troubleshooting & Repair LED Function Problems Description Input Filter Capacitor Discharge ProcedureRight Side of Machine Discharge ProcedureMain 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 Machine Input and Output Retest After RepairTable of Contents Electrical Diagrams Section Electrical DiagramsInput 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