Miller Electric CST 250 VRD manual Installation, Specifications, Duty Cycle And Overheating

Page 13

SECTION 3 − INSTALLATION

3-1. Specifications

Welding

Input

Rated

Welding

Maximum

Amperes Input At Rated Load

Net

Mode

Power

Output

Amperage

Open-Circuit

Output, 50/60 Hz

KVA

KW

Dimensions

Range

Voltage

Weight

220

400

440

250 A @

30 VDC,

32.1

18.2

16.4

12.3

8.7

50 % Duty

3-Phase

Cycle

5-250 A

30 VDC

200 A @

28 VDC,

24.2

14.4

12.6

9.9

6.5

H: 13-1/2 in

100 %

(343 mm)

Stick

Duty Cycle

40 lb

W: 7-1/2 in

(SMAW)

(191 mm)

(18.2 kg)

200 A @

28 VDC,

42.6

n/a

n/a

10.0

6.6

D: 18 in (457

50 % Duty

mm)

1-Phase

Cycle

5-200 A

30 VDC

150 A @

26 VDC,

33.6

n/a

n/a

7.4

5.7

100 %

Duty Cycle

3-2. Duty Cycle And Overheating

Duty Cycle is percentage of 10 minutes that unit can weld at rated load without overheating.

If unit overheats, output stops, and cooling fan runs. Wait fifteen minutes for unit to cool. Reduce amperage or duty cycle before welding.

Y Exceeding duty cycle can damage unit and void warranty.

206 173

200 A @ 50% Duty Cycle For Single Phase Operation

250 A @ 50% Duty Cycle For 3 Phase Operation

5 Minutes Welding	5 Minutes Resting	5 Minutes Welding	5 Minutes Resting
Overheating
	0	A or V
		15
		OR
	Minutes	Reduce Duty Cycle
	Minutes

OM-220 812 Page 9

Image 13

Contents Processes OM-220 812BDescription 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 EMF Information Principal Safety StandardsAbout Pacemakers − 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 blessuresInformation sur les champs électromagnétiques Principales normes de sécuritéConsignes relatives aux stimulateurs cardiaques Specifications − InstallationDuty Cycle And Overheating DC Amps Stick Smaw Volt-Ampere CurvesTIG Gtaw Volt-Ampere Curve Selecting a Location Dimensions And WeightLocation And Airflow 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 Diagrams− Selecting and Preparing Tungsten Electrode Safety Information About TungstenSelecting 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