Miller Electric 340 Owner's Manual

ProcessesBlue Thunder SeriesOM-233 381E 2009−10DescriptionArc Welding Power SourceStick (SMAW) WeldingModels: 253, 343, 403, 443Visit our website atww

OM-233 381 Page 6Warning! Watch Out! There arepossible hazards as shown by thesymbols.Electric shock from wiring can kill.Disconnect input plug or pow

OM-233 381 Page 72-3. Symbols And DefinitionsAAmperesNegative WeldOutput TerminalPositive WeldOutput TerminalProtective Earth(Ground)OutputSupplementa

OM-233 381 Page 8SECTION 3 − INSTALLATION3-1. Serial Number And Rating Label LocationThe serial number and rating information for this product is loca

OM-233 381 Page 93-4. Duty Cycle and OverheatingDuty Cycle is percentage of 10 min-utes that unit can weld at rated loadwithout overheating.If unit ov

OM-233 381 Page 103-5. Selecting A Location1 Lifting Eye2 Lifting ForksUse lifting eye or lifting forks tomove unit.If using lifting forks, extend for

OM-233 381 Page 113-7. Weld Output Terminals and Selecting Cable SizesNOTICE − The Total Cable Length in Weld Circuit (see table below) is the combine

OM-233 381 Page 123-9. Positioning Jumper LinksCheck input voltage available atsite.1 Jumper Links AccessRemove side panel.2 Jumper Link LabelCheck la

OM-233 381 Page 133-11. Connecting Input Power! Installation must meet all Na-tional and Local Codes −have only qualified personsmake this installatio

OM-233 381 Page 14SECTION 4 − OPERATION4-1. Controls1 Welding Current Indicator2 Weld Current Control3 + Positive Weld Terminal4 − Negative Weld Te

OM-233 381 Page 15SECTION 5 − MAINTENANCE AND TROUBLESHOOTING5-1. Routine Maintenance! Disconnect power before maintaining. = Check  = Change  = Cl

Thank you and congratulations on choosing Miller. Now you can get thejob done and get it done right. We know you don’t have time to do it anyother way

OM-233 381 Page 16SECTION 6 − ELECTRICAL DIAGRAMSS9215019Figure 6-1. Circuit Diagram For Blue Thunder 253 And 403 Models (230/400 V)

OM-233 381 Page 17S9215020Figure 6-2. Circuit Diagram For Blue Thunder 253 And 403 Models (380/520 V)

OM-233 381 Page 18S9215023Figure 6-3. Circuit Diagram For Blue Thunder 343 And 443 Models (230/400 V)

OM-233 381 Page 19S9215018Figure 6-4. Circuit Diagram For Blue Thunder 343 And 443 Models (380/520 V)

OM-233 381 Page 20SECTION 7 − PARTS LIST Hardware is common andnot available unless listed.987653230274312825242322212019381817373616141533341211103

OM-233 381 Page 21PartNo. DescriptionItemNo.Figure 7-1. Blue Thunder 253QuantityDia.Mkgs.1 +156121032 Upper Panel 1. . . . . . . . . . . . . . . . .

OM-233 381 Page 22 Hardware is common andnot available unless listed.9876531 32334273134262524232221201939181738371613141530281211103629804 963235Fig

OM-233 381 Page 23PartNo. DescriptionItemNo.Figure 7-2. Blue Thunder 343QuantityDia.Mkgs.1 +156121032 Upper Panel 1. . . . . . . . . . . . . . . . .

OM-233 381 Page 24 Hardware is common andnot available unless listed.804 9639876531 32334273134262524232221201939181738371613141530281211103629235Fig

OM-233 381 Page 25PartNo. DescriptionItemNo.Figure 7-3. Blue Thunder 403QuantityDia.Mkgs.1 +156121032 Upper Panel 1. . . . . . . . . . . . . . . . .

TABLE OF CONTENTSSECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1. Symbol

OM-233 381 Page 26 Hardware is common andnot available unless listed.1336344987653127262524232221201939181738371610111213141530283233804 96229235Figu

OM-233 381 Page 27PartNo. DescriptionItemNo.Figure 7-4. Blue Thunder 443QuantityDia.Mkgs.1 +156121033 Upper Panel 1. . . . . . . . . . . . . . . . .

NotesWork like a Pro!Pros weld and cutsafely. Read thesafety rules atthe beginningof this manual.

Notes

Notes

milan_warr 2009−05Effective January 1, 2009This limited warranty supersedes all previous Miller warranties and is exclusive with no otherguarantees or

ORIGINAL INSTRUCTIONS − PRINTED IN USA © 2009 Miller Electric Mfg. Co. 2009−01ITW Welding Products Italy S.r.l.Via Privata Iseo, 6/E20098 San Giuliano

dec_stat_milan1/07Declaration of Conformity forEuropean Community (CE) Products This information is provided for units with CE certification (see rat

OM-233 381 Page 1SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USINGsom _2009−087Protect yourself and others from injury — read and follow these precau

OM-233 381 Page 2Welding produces fumes and gases. Breathingthese fumes and gases can be hazardous to yourhealth.FUMES AND GASES can be hazardous. Ke

OM-233 381 Page 31-3. Additional Symbols For Installation, Operation, And MaintenanceFIRE OR EXPLOSION hazard. Do not install or place unit on, over,

OM-233 381 Page 41-4. California Proposition 65 WarningsWelding or cutting equipment produces fumes or gaseswhich contain chemicals known to the State

OM-233 381 Page 5SECTION 2 − DEFINITIONS2-1. Warning Label Definitions (For Wordless Labels)Warning! Watch Out! There arepossible hazards as shown by