Miller CST 280 User Manual

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Processes

Description

Stick (SMAW) Welding

OM-258 035F 2015−08

Arc Welding Power Source

CST 280 And CST 280 VRD

With Meter

TIG (GTAW) Welding

File: Stick (SMAW)

Visit our website at

www.MillerWelds.com

Table of Contents

Questions and Answers:

M
Mark ChambersSep 4, 2025
Why is the tungsten electrode oxidizing on my Miller CST 280?
- T
  Troy ContrerasSep 4, 2025
  If the tungsten electrode on your Miller Welding System is oxidizing and not remaining bright after welding, it could be because gas is being blown away from the weld zone, so shield the weld zone from drafts. Another reason could be inadequate postflow time; allow adequate postflow time to shield the tungsten while it is cooling after welding stops. Loose or leaking gas fittings could also be the cause, so check and tighten all gas fittings. Finally, water in the torch could be the problem.
J
justin78Sep 5, 2025
What to do if my Miller CST 280 has no weld output because the remote trigger has been left on?
- E
  egoldenSep 5, 2025
  If the Miller Welding System has no weld output, first remove the trigger, then wait about 5 seconds, and then restart the system. This issue might happen if the remote trigger was left on.
E
Elizabeth MartinezSep 7, 2025
Why is my Miller CST 280 overheating?
- T
  Timothy RileySep 7, 2025
  If the Miller Welding System is overheating, allow the unit to cool down. Then, retorque PPM1, PPM2, and PPM3 mounting hardware to 25 in lbs (2.8 N·m). This may be caused by the primary (IGBT) thermistor being over temperature.
H
Hannah ShawSep 8, 2025
What to do if my Miller CST 280 has no weld output due to voltage loss?
- C
  Christina EvansSep 8, 2025
  If your Miller Welding System has no weld output, it might be due to a voltage loss. Check the Vfb leads to ensure they are properly wired and connected.
J
James RiveraSep 9, 2025
How to fix a Miller Welding System that is not operating due to a blocked fan?
- M
  Mary MossSep 9, 2025
  If the Miller Welding System is not operating, check for anything blocking the fan and remove it. The problem may be a blocked fan.
J
jacob74Sep 12, 2025
Why does my Miller CST 280 have no weld output if the line voltage is too high or low?
- M
  michaelsimpsonSep 12, 2025
  If your Miller Welding System has no weld output, the line voltage might be too high or too low. The line voltage must be ±10%.

Miller CST 280 Specifications

General

Amperage Range	5-280 A
Input Frequency	50/60 Hz
Process	Stick (SMAW)
Rated Output	280 A
Input Voltage	208 V / 230 V / 460 V / 575 V

Summary

SECTION 1 - SAFETY PRECAUTIONS - READ BEFORE USING

Symbol Usage

Explains symbols for hazards, warnings, and notices.

Specific Welding Hazards

Details specific risks like fumes, arc rays, fire, explosion, EMF, noise, and cylinders.

Installation and Operation Symbols

Arc Welding Hazards

Introduces general hazards associated with arc welding processes.

Health and Compliance Warnings

SECTION 3 – DEFINITIONS

Additional Safety Symbols and Definitions

Explains safety symbols and their meaning.

SECTION 4 – SPECIFICATIONS

Unit Specifications

Duty Cycle And Overheating

Explains duty cycle percentages and consequences of overheating.

SECTION 5 – INSTALLATION

Selecting a Location

Weld Output Terminals And Selecting Cable Sizes

Details how to select appropriate weld cable sizes based on amperage and cable length.

TIG Lift-Arc™ DCEN (Direct Current Electrode Negative) Connections

Selecting 208 - 230 Volts AC Single/Three Phase Input Voltage

Guides on how to select the correct input voltage for the unit.

Selecting 400 - 575 Volts AC Three Phase Input Voltage

Electrical Service Guide

Provides recommendations for electrical service, circuit protection, and conductor sizing.

Connecting 1-Phase Input Power

Details the steps and components for connecting 1-phase input power.

Connecting 1-Phase Input Power (Continued)

Provides further instructions for connecting 1-phase input power and safety notes.

Connecting 3-Phase Input Power

Details the steps and components for connecting 3-phase input power.

Connecting 3-Phase Input Power (Continued)

Provides further instructions for connecting 3-phase input power and safety notes.

Stick DCEP (Direct Current Electrode Positive) Connections

SECTION 6 – OPERATION

Controls

Identifies and explains the function of various controls on the unit.

Process Select Control

Explains how to select different welding processes and electrode types.

Lift-Arc™ Start Procedure

Stick Start Procedure – Scratch Start Technique

SECTION 7 – MAINTENANCE AND TROUBLESHOOTING

Routine Maintenance

Troubleshooting

Details common problems, possible causes, and remedies based on LED flash codes.

Troubleshooting (Continued)

Provides further troubleshooting information for various error codes and conditions.

SECTION 9 – SELECTING AND PREPARING A TUNGSTEN FOR DC OR AC WELDING WITH INVERTER MACHINES

Selecting Tungsten Electrode (Wear Clean Gloves To Prevent Contamination Of Tungsten)

Preparing Tungsten Electrode For DC Electrode Negative (DCEN) Welding Or AC Welding With Inverter Machines

SECTION 10 – GUIDELINES FOR TIG WELDING (GTAW)

Positioning The Torch

Warranty

Miller's True Blue® Limited Warranty

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