Miller Electric NT 456 CV, NT 456 CC manual Lift-Arc TIG Procedure For CC/CV Models

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5-3. Lift-Arc TIG Procedure For CC/CV Models

1 2

1 − 2

“Touch” Seconds

Do NOT Strike Like A Match!

With Mode switch in the Lift-Arc TIG position, start an arc as follows:

1TIG Electrode

2Workpiece

Touch tungsten electrode to work- piece at weld start point, hold electrode to workpiece for 1-2 seconds, and slowly lift electrode. An arc will form when electrode is lifted.

Normal open-circuit voltage is not present before tungsten electrode touches workpiece; only a low sensing voltage is present between electrode and workpiece. The solid-state output contactor does not energize until after electrode is touching workpiece. This allows electrode to touch workpiece with- out overheating, sticking, or getting contaminated.

Ref. S-156 279

OM-2243 Page 23

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Contents File Multiprocess OM-2243212 113TProcesses DescriptionFrom Miller to You Table of Contents Page HOT Parts can cause severe burns Symbol UsageArc Welding Hazards Electric Shock can killFlying Metal or Dirt can injure eyes Fumes and Gases can be hazardousARC Rays can burn eyes and skin Welding can cause fire or explosionMoving Parts can cause injury Welding Wire can cause injuryFire or Explosion hazard Falling Unit can cause injuryAbout Implanted Medical Devices Principal Safety StandardsCalifornia Proposition 65 Warnings EMF InformationUNE Décharge Électrique peut entraîner la mort Symboles utilisésDES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion LA Chute DE L’APPAREIL peut blesser LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées Risque D’INCENDIE OU D’EXPLO- SionProposition californienne 65 Avertissements LES Fils DE Soudage peuvent provoquer des blessuresLE Soudage À L’ARC risque de provoquer des interférences Principales normes de sécurité Information EMFEn ce qui concerne les implants médicaux OM-2243 − Definitions Nameplate Safety Symbols− Installation SpecificationsDuty Cycle And Overheating 100 200 300 400 500 600 CC ModeCV Mode Volt-Ampere CurvesMovement Location Selecting a LocationDimensions And Weights DimensionsWeight VAC Receptacle And Circuit Breakers Be careful when placing or moving unit over uneven surfacesTurn Off power before connecting to receptacle TippingWeld Output Terminals And Selecting Cable Sizes Connecting Weld Output CablesSocket Connecting Remote ControlTurn off power before con Remote 14 Receptacle InformationPlacing Jumper Links Electrical Service Guide= GND/PE Earth Ground Connecting Input PowerWelding Power Source Input Power Connections Disconnect Device Input Power Con- nectionsControls − OperationMeter Functions For CC/CV Models Touch Seconds Do not Strike Like a Match Lift-Arc TIG Procedure For CC/CV ModelsDisconnect input power be- fore opening rear access door − Maintenance & TroubleshootingRoutine Maintenance Disconnect power before maintainingVoltmeter/Ammeter Help Displays HE.LTrouble Remedy TroubleshootingCircuit Diagram For NT 456 CC/CV Models − Electrical DiagramMain Assembly − Parts ListTHERMISTOR, NTC 10K OHM @ 25 DEG C 34IN Lead 14 12 274 Panel, Front With ComponentsPanel, Front With Components -1Item IGBT/Capacitor Assembly 221 IGBT/Capacitor Assembly -1itemPanel, Rear With Components Service Your distributor also givesSupport Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. Co For assistance in filing or settling claims, contact