Miller Electric CST 250 User Manual

Visit our website atwww.MillerWelds.comProcessesDescriptionStick (SMAW) WeldingOM-2237 206 035HJuly 2005Arc Welding Power SourceCST 250TIG (GTAW) Weld

OM-2237 Page 6Le rayonnement de l’arc génère des rayons visibles etinvisibles intenses (ultraviolets et infrarouges) suscep-tibles de causer des brûlu

OM-2237 Page 72-3. Autres symboles relatifs à l’installation, au fonctionnement et à l’entretien del’appareil.Risque D’INCENDIE OU D’EXPLO-SION Ne pa

OM-2237 Page 82-4. Principales normes de sécuritéSafety in Welding, Cutting, and Allied Processes, norme ANSI Z49.1,de l’American Welding Society, 550

OM-2237 Page 9SECTION 3 − INSTALLATION3-1. SpecificationsWeldingModeInputPowerRatedOutputWeldingAmperageRangeMaximumOpen-CircuitVoltageAmperes Input A

OM-2237 Page 103-3. Stick (SMAW) Volt-Ampere CurvesVolt-ampere curves show minimumand maximum voltage andamperage output capabilities ofwelding power

OM-2237 Page 113-4. TIG (GTAW) Volt-Ampere CurveVolt-ampere curves show minimumand maximum voltage andamperage output capabilities ofwelding power sou

OM-2237 Page 123-5. Selecting A Location1 Line Disconnect DeviceLocate unit near correct inputpower supply. Special installation may berequired where

OM-2237 Page 133-6. Weld Output Terminals And Selecting Cable Sizes*Weld Cable Size** and Total Cable (Copper) Length in Weld CircuitNot Exceeding100

OM-2237 Page 143-7. TIG Lift-Arct DCEN (Direct Current Electrode Negative) ConnectionsRef. 802 888 / Ref. 803 0801 Positive (+) Weld OutputTerminalCon

OM-2237 Page 153-8. Stick DCEP (Direct Current Electrode Positive) ConnectionsRef. 802 888 / Ref. 803 0801 Negative (−) Weld OutputTerminalConnect wor

Miller Electric manufactures a full lineof welders and welding related equipment.For information on other quality Millerproducts, contact your local M

OM-2237 Page 163-10. Selecting 230 Volts AC Single/Three Phase Input Voltage803 079 / 803 077 Turn Off welding powersource, and disconnectinput power

OM-2237 Page 173-11. Selecting 460 - 575 Volts AC Three Phase Input Voltage803 079 / 803 078 Turn Off welding powersource, and disconnectinput power

OM-2237 Page 18 Disconnect and lockout/tag-out input power beforeconnecting input conduc-tors from unit. Have only qualified personsmake this instal

OM-2237 Page 19SECTION 4 − OPERATION4-1. Controls204 301 / 803 080132NOTE: Green on nameplate indicates a TIGfunction, Gray indicates a Stick function

OM-2237 Page 204-2. Process Select Control1 Process Select ControlRotate knob to select desiredprocess.Lift-Arc TIG - Normalopen-circuit voltage is

OM-2237 Page 214-3. Stick Start Procedure − Scratch Start TechniqueWith Stick selected, start arc asfollows:1 Electrode2 Workpiece3 ArcDrag electrode

OM-2237 Page 224-5. Amperage Control1 AMP ADJUST (AmperageControl)Rotate knob clockwise to increaseamperage (5-250 amps).14-6. Remote 14 Receptacle In

OM-2237 Page 23SECTION 5 − MAINTENANCE AND TROUBLESHOOTING5-1. Routine Maintenance Disconnect power before maintaining. Maintain more often during s

OM-2237 Page 245-3. Troubleshooting121 Output LED (Blue)2 High Temperature LED(Yellow)803 080Trouble Possible Causes RemedyNo weld output; unit comple

OM-2237 Page 25Trouble RemedyPossible CausesErratic or improper weld output. Weld cable too small or defective. Use proper size and type of weld cable

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

OM-2237 Page 26SECTION 6 − ELECTRICAL DIAGRAMSFigure 6-1. Circuit Diagram206 171-C

OM-2237 Page 27SECTION 7 − SELECTING AND PREPARING TUNGSTENELECTRODEgtaw 7/97For additional information, see your distributor for a handbook on the Ga

OM-2237 Page 287-3. Preparing Tungsten For AC Or DC Electrode Negative (DCEN) WeldingRef. S-0161 / Ref. S-01621 Tungsten Electrode2 Tapered EndGrind e

OM-2237 Page 29Notes

OM-2237 Page 30SECTION 8 − PARTS LIST Hardware is common andnot available unless listed. 803 157-B812132021252372422324105196151914141518171928261127

OM-2237 Page 31Figure 8-1. Main AssemblyItemNo.PartNo. Description Quantity1 205758 PANEL,FRONT W/CMPNT 1. . . . . . . . . . . . . . . . . . . . .

OM-2237 Page 32 Hardware is common andnot available unless listed. 803 158149131215317421811982046522211016117723Figure 8-2. Panel, Front w/Component

OM-2237 Page 33 Hardware is common andnot available unless listed. 803 161-B76127345Figure 8-3. Panel, Rear w/ComponentsFigure 8-3. Panel, Rear w/Com

OM-2237 Page 34 Hardware is common andnot available unless listed. 803 163-B1331109111214878254681615Figure 8-4. Magnetics SubassemblyDiagrammarkingI

OM-2237 Page 35 Hardware is common andnot available unless listed. 803 159-C481967321213111012513Figure 8-5. Heat Sink Assembly, Output DiodeDiagramm

OM-2237 Page 36 Hardware is common andnot available unless listed. 803 16023154876Figure 8-6. Base AssemblyDiagrammarkingItemNo.PartNo. DescriptionQu

OM-2237 Page 37 Hardware is common andnot available unless listed. Ref. 803 162123Figure 8-7. Heat Sink Assembly, InputDiagrammarkingItemNo.PartNo. D

Notes

Warranty Questions?Call1-800-4-A-MILLERfor your localMiller distributor.miller_warr 1/05Your distributor also givesyou ...ServiceYou always get the fa

PRINTED IN USA © 2005 Miller Electric Mfg. Co. 1/05Miller Electric Mfg. Co.An Illinois Tool Works Company1635 West Spencer StreetAppleton, WI 54914 US

OM-2237 Page 1SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USINGsom _8/031-1. Symbol UsageMeans Warning! Watch Out! There are possible hazardswith thi

OM-2237 Page 2Arc rays from the welding process produce intensevisible and invisible (ultraviolet and infrared) raysthat can burn eyes and skin. Spark

OM-2237 Page 31-3. Additional Symbols For Installation, Operation, And MaintenanceFIRE OR EXPLOSION hazard. Do not install or place unit on, over, or

OM-2237 Page 41-5. Principal Safety StandardsSafety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,from American Welding Society, 550

OM-2237 Page 5SECTION 2 − CONSIGNES DE SÉCURITÉ − À LIRE AVANTUTILISATIONsom_fre 8/032-1. Signification des symbolesSignifie « Mise en garde. Faire pr