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Welding System
Lincoln Electric
SVM140-A
service manual
Iii
Models:
SVM140-A
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Troubleshooting
Install
Wiring Diagram PRO-CUT
SVM Error Reporting Form
Safety Status Indicator
Input Wire and Fuse Size
Maintenance
Output Problems
General Options Accessories
PC Board ASSEMBLY-DISPLAY
Page 4
Image 4
Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
iii
iii
NOTES
PRO-CUT
55
Page 3
Page 5
Page 4
Image 4
Page 3
Page 5
Contents
PRO-CUT
Safety
Safety
Plasma ARC can injure
Iii
Master Table of Contents for ALL Sections
Table of Contents Installation Section
Installation
Technical Specifications PRO-CUT
Technical Specifications Cont’d PRO-CUT
GAS Requirements
Select Suitable Location
Safety Precautions
Lifting and Moving
Input Power Cord Connector Installation
Input Wire and Fuse Size
Input Connections
Ground Connection
Reconnect Procedure
Reconnect Procedure
GAS Input Connections
Return Return to Master TOC
Output Connections
Torch Connection
Table of Contents Operation Section
OPERATIONB-2
Safety Instructions
Operating Instructions
Design Features Advantages
Operational Features and Controls
Operation
General Description
Consumable Life
Cutting Capability
Limitations
Pilot ARC Considerations
Controls and Settings
Cutting Operation
Safety Status Indicator
Preheat Temperature for
Procedure Recommendations
Plasma Cutting
User Responsibility
Thick Sections of Metal
Suggestions for Extra Utility from the PRO-CUT System
Table of Contents
Accessories
General Options Accessories
Table of Contents Maintenance
Input Filter Capacitor Discharge Procedure
Electric Shock can kill
Routine Maintenance
Periodic Maintenance
Maintenance
Table of Contents Theory of Operation Section
Theory of Operation
Input Line Voltage Contactor and Main Transformer
Precharge and Protection
Figure E.3 Precharge and Protection
Main Transformer
Figure E.4 Main Transformer
Output Board and Torch
Figure E.5 Plasma Output Board and Torch
Control and Display Boards
Figure E.6 Control and Display Boards
Overload Protection
Protection Circuits
Thermal Protection
Insulated Gate Bipolar Transistor Igbt Operation
Minimum Output
Pulse Width Modulation
Maximum Output
PRO-CUT
Table of Contents Troubleshooting & Repair Section
Troubleshooting & Repair
HOW to USE Troubleshooting Guide
PC Board Troubleshooting Procedures
Troubleshooting Guide
Output Problems
Function Problems
Function Problems
Cutting Problems
LED Function Problems
Troubleshooting & Repair
PRO-CUT Troubleshooting Flowchart
PRO-CUT
Description
Materials Needed
Input Filter Capacitor Discharge Procedure
Figure F.1 Location of Input Filter Capacitor Terminals
Input Rectifier Test
Test Procedure
Input Rectifier Test
Figure F.2
PRO-CUT
Primary Power Board Resistance Test Capacitor Voltage Test
Primary Power Board Resistance Test
Capacitor Voltage Test
Board Removal and Replacement Procedure
Test Procedure
Table F.3 Capacitor Voltages
PRO-CUT
Output Power Board Resistance Test
Output Power Board Resistance Test
Figure F.4 Output Power Board Lead Locations
Output Power Board Resistance Test
PRO-CUT
Torch Continuity and Solenoid Test
Not used Inside Power Source
Torch Continuity and Solenoid Test
Troubleshooting & Repair
PRO-CUT
AIR/GAS Solenoid Test
AIR/GAS Solenoid Test
Figure F.6 AIR Solenoid
T2 Auxiliary Transformer Test
Procedure
T2 Auxiliary Transformer Test
Test Point Expected Voltage
PRO-CUT
Trigger Circuit Test
Trigger Circuit Test
Torch Receptacle
Perform the Input Filter Capacitor Discharge Procedure
PRO-CUT 55 Output Board LED Definitions
Control Board LED Definitions
Figure F.11 Control Board LEDs
PRO-CUT
LOW Voltage Circuit Test
LOW Voltage Circuit Test
Return Section TOC
Figure F.12, Low Voltage Circuit Diagram
G3326 PRO-CUT 55 Output
Figure F.15 Display Board Test Points
PRO-CUT
Control Board Removal and Replacement
Control Board Removal and Replacement
Figure F.16 Case Front Screw Removal
Figure F.18 Control Board Removal from Mounting Pins
PRO-CUT
Display Board Removal and Replacement
Display Board Removal & Replacement
Figure F.19 Case Front Screw Removal
Figure F.20 Display Board Removal
PRO-CUT
Output Power Board Removal and Replacement
Output Power Board Removal & Replacement
Figure F.21 Output Power Board Removal
B21
Replacement Procedure
Description
Removal and Replacement
Primary Power Board and Filter Capacitor
Removal Procedure
Figure F.24 Power Board Heatsink and Capacitor Removal
Capacitor Replacement and P.C. Board Replacement
Capacitor Removal
Input Rectifier Bridge Removal and Replacement
Input Rectifier Bridge Removal and Replacement
Screw
Troubleshooting & Repair
Retest After Repair
Input Idle Amps and Watts
PRO-CUT
PRO CUT
Wiring Diagram PRO-CUT
Electrical Diagrams
SCHEMATIC-POWER PC Board
PC Board ASSEMBLY-DISPLAY
Schematic Display PC Board
Schematic Control PC Board
PC Board ASSEMBLY-CONTROL G3328-1
PC Board ASSEMBLY-CONTROL G3328-2
PC Board ASSEMBLY-OUTPUT G3326-1
PC Board ASSEMBLY-OUTPUT G3326-2
PC Board ASSEMBLY-POWER G3172-1
PC Board ASSEMBLY-POWER G3172-2
SVM Error Reporting Form
