Miller MigMatic 300 User Manual

OWNER’S MANUAL
Processes
Description
MIG (GMAW) Welding
Flux Cored (FCAW) Welding
Arc Welding Power Source
Wire Feeder
OM-251958F 2018-02
MigMatic 300/380 And DX
R
CE
File: MIG (GMAW)
For product information,
Owner’s Manual translations,
and more, visit
www.MillerWelds.com

Miller MigMatic 300 Specifications

General

Brand	Miller
Model	MigMatic 300
Category	Welding System
Language	English

Summary

OWNER'S MANUAL

From Miller to You

DECLARATION OF CONFORMITY

EMF DATA SHEET FOR ARC WELDING POWER SOURCE

SECTION 1 - SAFETY PRECAUTIONS - READ BEFORE USING

1-1. Symbol Usage

Explains the meaning of symbols used in the manual for hazard identification.

1-2. Arc Welding Hazards

Details potential hazards associated with arc welding processes.

1-4. California Proposition 65 Warnings

Provides warnings about chemicals in the product known to cause cancer or birth defects.

1-5. Principal Safety Standards

Lists key safety standards and regulations applicable to welding equipment.

1-6. EMF Information

Explains the generation of electromagnetic fields and their potential impact.

SECTION 2 – DEFINITIONS

2-1. Additional Safety Symbols And Definitions

Defines safety symbols specifically found on CE-marked products.

2-2. Miscellaneous Symbols And Definitions

Provides definitions for various symbols and terms used in the manual.

SECTION 3 – SPECIFICATIONS

3-1. Serial Number And Rating Label Location

Indicates where to find the serial number and rating information on the product.

3-2. Specifications

Lists technical specifications such as output, voltage, range, dimensions, and weight.

3-3. Duty Cycle And Overheating

Explains duty cycle ratings and behavior related to overheating.

3-4. Volt-Ampere Curves

Displays voltage and amperage output capabilities of the welding power source.

3-5. Environmental Specifications

Details IP rating, operating, and storage temperature specifications.

SECTION 4 – INSTALLATION

4-1. Installing Gas Supply

Provides instructions for connecting the shielding gas supply cylinder and regulator.

4-2. Installing Wire Spool And Adjusting Hub Tension

Guides on how to install the wire spool and set the hub tension for feeding.

4-3. Positioning Jumper Links (230/400V 3-Phase Models)

Instructions for setting jumper links to match the input voltage for 3-phase models.

4-4. Electrical Service Guide

Recommendations for electrical service requirements, including voltage, current, and conductor sizing.

4-5. Connecting 3-Phase Input Power

Step-by-step guide for safely connecting the 3-phase input power to the unit.

4-6. Changing Drive Rolls And Wire Inlet Guide (MigMatic 380 Models)

Instructions for replacing drive rolls and the wire inlet guide on MigMatic 380 models.

4-7. Aligning Drive Rolls and Wire Guide

Details how to properly align drive rolls and the wire guide for smooth wire feeding.

4-8. Threading Welding Wire And Adjusting Pressure Roll Tension

Instructions for threading welding wire and setting the correct pressure roll tension.

SECTION 5 – OPERATION

5-1. Controls For MigMatic 300

Identifies and explains the controls and indicators on the MigMatic 300 model.

5-2. Controls For MigMatic 380

Identifies and explains the controls and indicators on the MigMatic 380 model.

5-3. Selecting Parameters (MigMatic 300 And 380 Models)

Guide on selecting and adjusting welding parameters like voltage, amperage, and wire speed.

5-4. Sequencer Controls Settings (MigMatic 300 And 380 Models)

Details on setting up sequencer controls for preflow, burnback, postflow, and spot time.

5-5. Trigger Mode And Spot Time Selection (MigMatic 300 And 380 Models)

Explains how to select trigger modes (2-t, 4-t) and spot time settings.

5-6. Welding Wire Loading Settings (MigMatic 300 And 380 Models)

Instructions for loading welding wire, including spool installation and tension adjustment.

5-7. Resetting Unit To Factory Default Settings (MigMatic 300 And 380 Models)

Procedure to reset all operator-specified parameters back to factory defaults.

5-8. Controls For MigMatic 300DX

Identifies and explains the controls specific to the MigMatic 300DX model.

5-9. Controls For MigMatic 380DX

Identifies and explains the controls specific to the MigMatic 380DX model.

5-10. Burnback And Run-In Controls (DX Models Only)

Details the burnback and run-in controls for DX models.

5-11. Welding Power Source Input Line Voltage Adjustment (DX Models Only)

Guide for adjusting input line voltage compensation for DX models.

5-12. Welding Power Source Setup Menu (DX Models Only)

Explains how to navigate and use the setup menu for various welding parameters.

5-13. Trigger Mode Selection (DX Models Only)

Instructions for selecting trigger modes on DX models.

5-14. Welding Wire Diameter Selection For Synergic MIG (DX Models Only)

Guide to selecting the correct welding wire diameter for synergic MIG welding.

5-15. Welding Wire Type Selection For Synergic MIG (DX Models Only)

Instructions for selecting the welding wire material type for synergic MIG.

5-16. Gas Selection For Synergic MIG (DX Models Only)

Guide for selecting the appropriate shielding gas for synergic MIG welding.

5-17. Selecting Manual MIG Welding (DX Models Only)

Steps to select and operate the manual MIG welding mode.

5-18. Selecting Synergic MIG Welding (DX Models Only)

Steps to select and operate the synergic MIG welding mode.

SECTION 6 – MAINTENANCE & TROUBLESHOOTING

6-1. Routine Maintenance

Schedule and procedures for regular maintenance tasks to ensure optimal performance.

6-2. Welding Gun And Wire Drive Assembly

Maintenance checks for the welding gun and wire drive assembly.

6-3. Unit Overload

Information on unit overload protection and actions to take.

6-4. Troubleshooting

Provides common problems and their solutions for diagnosing and fixing issues.

SECTION 7 – ELECTRICAL DIAGRAMS

SECTION 8 – PARTS LIST