Lincoln Electric SVM149-A service manual Table of Contents Theory of Operation Section

Page 27

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Section E-1

Section E-1

TABLE OF CONTENTS

-THEORY OF OPERATION SECTION-

Theory of Operation	Section E
General Description	E-2
Input Line Voltage and Auxiliary Transformer	E-2
Precharge and Protection	E-3
Main Transformer	E-4
Output Section and Torch	E-5
Control Board	E-6
Protection Circuits	E-7
Overload Protection	E-7
Thermal Protection	E-7
Accidental Operation Protection	E-7
Safety Parts-In-Place Protection	E-7
Insulated Gate Bipolar Transistor (IGBT) Operation	E-8

FIGURE E.1 – PRO-CUT 25 BLOCK LOGIC DIAGRAM

INPUT 115/230/1/50/60 VAC

L1 SW1 A 300uH

B

RL3		RL2
R1		RL2
10/10W		RL2
10/10W	F1
1A/250V	F1	RL2

C26

	AC	AC
	CP	CP	CP
	CP	CP	CP
	CP	CP
	AC	AC

R1

CP

R2

15K/3W 15K/3W

1500uF/250V

+

C1a,b

+

C2a,b

Q1a,b,c	D10	Lout	BS1
IRG4BC30W	D10	Lout	BS1	WRK
		240uH	8A
			8A
T2	SEC		+12VDC TRANSFER
PRI	SEC
C12	D11		RL1	NZL (2)
C12
			C14

WORK CLAMP

V1

RL2

RL1

	R24
Q2a,b,c	6 . 8k/5W
IRG4BC30W

FN1	230VAC	V2
		V2

115VAC

L1

T1

230V

RL1

1500uF/250V

	SHUNT		EL (3)
C13	SH-	SH+

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NO

COM

NC

Purge Switch

115V

L1

Input

Voltage Board

12VDC

Air

Solenoid

1

CN1	15VAC				CN2													CN3
1	15VAC				9													1
2	15VAC				10													2
3	SAFETY				5													3
4	+28VDC				6													4
5	SEC GND				3													Main Inverter Board
6	OVLOAD				22													Main Inverter Board
7	115/230				2
8	+12VDC				20										CN1
					15 16 12 18 14 1										CN1			4
					15 16 12 18 14 1			11 4		13 7		19 24 21 23 8		17	1	2	3	4
	PS2	PS1	SEC GND OVLOAD	SAFETY	V+ EV1 +15Vrms	+12VDC	+8V SW +12VDC SW	SEC GND	OVLOAD	TRANSFER SW	TRANSFER	SOL 1 DRIVER	V OUT OUTPUT TRIGGER SOL 2 DRIVER		POT WIPER	POT CW	POT CCW
CN1	8	6	17 9	3	1	2	18 14 7		15 4		11 5		16 10 12 13		23 22 24
CN1

Display LED's

Output Control

Control Board

PT

12VDC Solenoid 2

PRO-CUT 25

Image 27

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