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POWER MIG 255
Lincoln Electric POWER MIG 255 Welder Manuals
Manuals and User Guides for Lincoln Electric POWER MIG 255 Welder. We have
1
Lincoln Electric POWER MIG 255 Welder manual available for free PDF download: Service Manual
Lincoln Electric POWER MIG 255 Service Manual (108 pages)
Lincoln Electric Welder User Manual
Brand:
Lincoln Electric
| Category:
Welding System
| Size: 1.85 MB
Table of Contents
Master for All Sections
6
Power Mig
1
Service Manual
1
Safety
2
Electric Shock Can Kill
3
Table of Contents
6
Installation
8
Technical Specifications
8
Input Power, Grounding and Connection Diagrams
9
Installation
9
Location
9
Safety Precautions
9
Uncrating the POWER MIG 255
9
Output Polarity Connections
11
Gun and Cable Installation
12
Shielding Gas
12
Operation Section
13
Operation
15
Limitations
15
Product Description
15
Recommended Processes and Equipment
15
Welding Capability
15
Description of Controls
16
Wire Drive Roll
16
Wire Size Conversion Parts
16
Procedure for Changing Drive and Idle Roll Sets
17
Wire Reel Loading - Readi-Reels, Spools, or Coils
17
To Mount a 30 Lb (14 Kg) Readi-Reel Package
17
To Mount 10 to 44 Lb (4.5-20 Kg) Spools (12 In./300 MM Diameter) or 14 Lb (6 Kg) Innershield Coils
17
Feeding Wire Electrode
18
Idle Roll Pressure Setting
18
Setting Run-In Speed on Standard Power MIG Feeder
18
Fast or Slow Run-In Mode Selection (When Timer Option Is Not Installed
18
Instructions to Enter Slow Run-In
18
Instructions to Enter Fast Run-In
18
To Start the Welder
18
Avoiding Wire Feeding Problems
19
Making a Weld
19
Fan Control
20
Input Line Voltage Protection
20
Overcurrent Protection
20
Welding Thermal Overload Protection
20
Wire Feed Overload Protection
20
Accessories
22
Alternative Magnum Gmaw Gun and Cable Assemblies
22
Drive Roll Kits
22
Magnum Gun Connection Kit
22
Table of Contents
25
Maintenance
26
Cable Cleaning
26
Drive Rolls and Guide Tubes
26
Gun Tubes and Nozzles
26
Routine and Periodic Maintenance
26
Safety Precautions
26
Contact Tip and Gas Nozzle Installation
28
Liner Removal and Replacement
28
Liner Removal, Installation, and Trimming Instructions for Magnum 250L
28
Gun Handle Disassembly
29
Accessories and Expendable Replacement Parts for Magnum 250L Gun and Cable Assemblies
30
Table of Contents
31
Theory of Operation
32
Input Line Voltage and Main Transformer
32
Output Rectification and Feedback Control
33
Constant Voltage Output
34
Wire Drive Motor and Feedback
35
Thermal and Overload Protection
36
Overcurrent Protection
36
Wire Feed Overload Protection
36
SCR Operation
37
Table of Contents
39
How to Use Troubleshooting Guide
40
Pc Board Troubleshooting Procedures
41
Troubleshooting & Repair Section
40
Troubleshooting Guide
42
Main Transformer Test
49
Rectifier Diode Bridge Test
53
Static SCR Rectifier Assembly Test
57
Active SCR Rectifier Assembly Test
59
Wire Drive Motor and Tachometer Feedback Test
65
Normal Open Circuit Voltage Waveform
69
Typical Output Voltage Waveform - Machine Loaded
70
Abnormal Output Voltage Waveform - Machine Loaded One Output SCR Not Functioning
71
Abnormal Open Circuit Voltage Output Capacitor Bank Not Functioning
72
Typical SCR Gate Voltage Waveform
73
Control PC Board Removal and Replacement
75
Troubleshooting and Repair
77
Wire Drive Assembly Removal and Replacement
80
SCR Output Rectifier Removal and Replacement
84
Capacitor Bank Removal and Replacement
88
Main Transformer and Output Choke Removal and Replacement
90
Retest after Repair
95
Table of Contents
97
Electrical Diagrams
99
Wiring Diagram - Entire Machine - Code 10583 - (L10980
99
Wiring Diagram - Entire Machine - Code 10986 - (L11980
100
Wiring Diagram - Entire Machine - Code 10990 - (L11979
101
Control PC Board Schematic (G3520-1D1
102
Control PC Board Assembly (G3521-1
103
Display PC Board Schematic (L10951
104
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