Miller Electric CST 250 VRD manual Use proper size and type of weld cable see Section

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	Trouble	Possible Causes	Remedy

	Erratic or improper weld output.	Weld cable too small or defective.	Use proper size and type of weld cable (see Section 3-6).

		Dirty or loose connections.	Clean and tighten all weld connections (see Section 3-6).

	Wandering arc	Improper size tungsten.	Use proper size tungsten (see Section 7).

		Worn or defective tungsten.	Use properly prepared tungsten (see Section 7).

		Shielding gas flow too high.	Reduce shielding gas flow rate (see Section 3-7).

	Tungsten electrode oxidizing and not	Shielding gas blown away from weld	Shield weld zone from drafts.
	remaining bright after conclusion of	zone.
	weld.
	weld.	Inadequate postflow time.	Allow adequate postflow time to shield tungsten while it
		Inadequate postflow time.	Allow adequate postflow time to shield tungsten while it
			cools, after welding stops.

		Loose or leaking gas fittings.	Check and tighten all gas fittings (see Section 3-7).

		Water in torch.	Refer to torch manual.

OM-220 812 Page 25

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Contents Description OM-220 812BProcesses From Miller to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information − Consignes DE Sécurité − À Lire Avant Utilisation Signification des symbolesLES Décharges Électriques peuvent être mortelles LES Fumées ET LES GAZ peuvent être dangereuxLES Particules Projetées peu- vent blesser les yeux LE Soudage peut causer un incen- die ou une explosionLES Pièces Chaudes peuvent cau- ser des brûlures graves LE Bruit peut affecter l’ouïeLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut Faire LES Pièces Mobiles peuvent cau- ser des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sécuritéInformation sur les champs électromagnétiques Duty Cycle And Overheating − InstallationSpecifications DC Amps Stick Smaw Volt-Ampere CurvesTIG Gtaw Volt-Ampere Curve Location And Airflow Dimensions And WeightSelecting a Location 150 ft 200 ft 250 ft Weld Output Terminals And Selecting Cable Sizes350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Terminals AmperesPositive + Weld Output Terminal 50/60 Hz Single-Phase 50/60 Hz Three-Phase Electrical Service GuideStick Dcep Direct Current Electrode Positive Connections Input VoltageSelecting 220 Volts AC Single/Three Phase Input Voltage Relinking Board Connection For 400 440 VAC Input Power Selecting 400 440 Volts AC Three Phase Input VoltageFor three-phase operation Connecting Input PowerFor single-phase operation = GND/PEControls − OperationLift-ArctTIG Normal Process Select ControlLift-ArcStart Procedure Stick Start Procedure − Scratch Start TechniqueLift-Arc Start ApplicationRemote 14 Receptacle Information Amp Adjust ControlFan-On-Demand Rack MountingRoutine Maintenance − Maintenance and TroubleshootingBlowing Out Inside Of Unit MonthsTrouble Possible Causes Remedy TroubleshootingUse proper size and type of weld cable see Section Circuit Diagram − Electrical DiagramsSelecting Tungsten Electrode Safety Information About Tungsten− Selecting and Preparing Tungsten Electrode Tungsten Electrode OM-220 812 Main Assembly − Parts ListCAPACITOR,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 Support ServiceMiller Electric Mfg. Co Owner’s Record