Miller Electric CST 250 VRD manual Positive + Weld Output Terminal

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3-7. TIG Lift-ArctDCEN (Direct Current Electrode Negative) Connections

1

2

7

1Positive (+) Weld Output Terminal

			Connect work lead to positive weld
		4	output terminal.
	5	4	2	Negative (−) Weld Output
	5		2	Negative (−) Weld Output
				Terminal
	6		Connect TIG torch to negative weld
			output terminal.
	3		3	Gas Cylinder
	3		4	Cylinder Valve
			4	Cylinder Valve

Open valve slightly so gas flow blows dirt from valve. Close valve.

5Regulator/Flowmeter

6Flow Adjust

Typical flow rate is 15 cubic feet per hour (7.1 liters per minute).

Connect torch gas hose to regulator/flowmeter.

7 Gas Valve

Valve controls gas preflow and postflow. Open valve on torch just before welding.

Tools Needed:

11/16 in, 1-1/8 in, (21 mm)

Ref. 802 888 / Ref. 803 080

OM-220 812 Page 14

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Contents OM-220 812B ProcessesDescription From Miller to You Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers LES Décharges Électriques peuvent être mortelles Signification des symboles− Consignes DE Sécurité − À Lire Avant Utilisation LES Fumées ET LES GAZ peuvent être dangereuxLES Pièces Chaudes peuvent cau- ser des brûlures graves LE Soudage peut causer un incen- die ou une explosionLES Particules Projetées peu- vent blesser les yeux LE Bruit peut affecter l’ouïe’EMPLOI Excessif peut Faire Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser LES Pièces Mobiles peuvent cau- ser des blessuresPrincipales normes de sécurité Information sur les champs électromagnétiquesConsignes relatives aux stimulateurs cardiaques − Installation SpecificationsDuty Cycle And Overheating Stick Smaw Volt-Ampere Curves DC AmpsTIG Gtaw Volt-Ampere Curve Dimensions And Weight Selecting a LocationLocation And Airflow 350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Weld Output Terminals And Selecting Cable Sizes150 ft 200 ft 250 ft Terminals AmperesPositive + Weld Output Terminal Stick Dcep Direct Current Electrode Positive Connections Electrical Service Guide50/60 Hz Single-Phase 50/60 Hz Three-Phase Input VoltageSelecting 220 Volts AC Single/Three Phase Input Voltage Selecting 400 440 Volts AC Three Phase Input Voltage Relinking Board Connection For 400 440 VAC Input PowerFor single-phase operation Connecting Input PowerFor three-phase operation = GND/PE− Operation ControlsProcess Select Control Lift-ArctTIG NormalLift-Arc Start Stick Start Procedure − Scratch Start TechniqueLift-ArcStart Procedure ApplicationFan-On-Demand Amp Adjust ControlRemote 14 Receptacle Information Rack MountingBlowing Out Inside Of Unit − Maintenance and TroubleshootingRoutine Maintenance MonthsTroubleshooting Trouble Possible Causes RemedyUse proper size and type of weld cable see Section − Electrical Diagrams Circuit DiagramSafety Information About Tungsten − Selecting and Preparing Tungsten ElectrodeSelecting Tungsten Electrode Tungsten Electrode OM-220 812 − Parts List Main AssemblyCAPACITOR,ELCTLT 2400 UF 500 VDC can 2.5 DIA Panel, Front w/Components Panel, Rear w/Components Magnetics Subassembly Heat Sink Assembly, Output Diode Base Assembly Heat Sink Assembly, Input Page Service SupportOwner’s Record Miller Electric Mfg. Co