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Legend 301 G
Miller Legend 301 G User Manual
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Processes
TM-4411A
March 2003
Eff. w/Serial Number LC357086
Visit our website at
www.MillerWelds.com
Description
TIG (GT
A
W) Welding
Stick (SMAW
)
Welding
Engine Driven Welding Generator
MIG (GMAW) W
elding &
Flux Cored (FCAW
)
Welding
-
With V
oltage Sensing Feeder
Miller
Legend
301
G
R
2
Table of Contents
Table of Contents
2
Section 1 - Safety Precautions for Servicing
5
Symbol Usage
5
Servicing Hazards
5
EMF Information
6
Section 2 - Definitions
7
Symbol Definitions
7
Section 3 - Specifications
8
Description
8
Weld, Power, and Engine Specifications
8
Dimensions, Weights, and Operating Angles
8
Fuel Consumption While Welding and Using Generator Power
9
Generator Power Curve
9
Duty Cycle
10
Stick and MIG Mode Volt-Ampere Curves
11
DC TIG Mode Volt-Ampere Curves
12
Section 4 - Installation
13
Installing Welding Generator
13
Engine Prestart Checks
14
Activating the Dry Charge Battery (if Applicable)
15
Connecting the Battery
16
Installing Exhaust Pipe
16
Connecting to Weld Output Terminals
17
Selecting Weld Cable Sizes
17
Remote Receptacle Information
18
Adjusting Wire (MIG) Weld Puddle Consistency
19
Section 5 - Operating Welding Generator
20
Front Panel Controls
20
Description of Front Panel Controls
21
Process Switch
22
Remote Amperage/Voltage Control
23
Section 6 - Operating Auxiliary Equipment
24
60 Hz Generator Power Receptacles and Circuit Breakers
24
Variable Frequency (Hz) Generator Power Receptacle RC3
25
Wiring Optional 240 Volt Plug
25
Section 7 - Maintenance
26
Routine Maintenance
26
Maintenance Label
27
Servicing Optional Spark Arrestor
27
Servicing Air Cleaner
28
Changing Engine Oil, Oil Filter, and Fuel Filter
29
Overload Protection
30
Section 8 - Theory of Operation
32
Section 9 - Explanation of Electrical Parts
34
Section 10 - Troubleshooting
38
Troubleshooting Tables
38
Troubleshooting Circuit Diagram for Welding Generator (AC/DC Models) (Use with Section 10-3)
44
Troubleshooting Values for Circuit Diagram (AC/DC Models) (Use with Section 10-2)
46
Waveforms for Section 10-2
48
Power Board PC1 Testing Information
50
Power Board PC1 Test Point Values
51
Control Board PC2 Testing Information
53
Control Board PC2 Test Point Values
54
Power Board PC7 Testing Information
56
Power Board PC7 Test Point Values
56
Replacing Brushes and Cleaning Slip Rings
57
Adjusting Electronic Governor
58
Checking Unit Output after Servicing
59
Section 11 - Disassembly and Reassembly
60
Disassembly of Unit
60
Disassembly of Generator
61
Section 12 - Electrical Diagrams
63
Section 13 - Parts List for Lc357086 and Following
78
4
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Miller Legend 301 G Specifications
General
Brand
Miller
Model
Legend 301 G
Category
Welding System
Language
English
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