Duty Cycle And Overheating, Model | Miller Electric 333, 271, 383

3-2. Duty Cycle And Overheating

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

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

Y Exceeding duty cycle can damage unit and void warranty.

% DUTY CYCLE

60% Duty Cycle At 400 Amperes				100% Duty Cycle At 300 Amperes

6 Minutes Welding	4 Minutes Resting	Continuous Welding
Overheating		A or V
	0	A or V
	0
		15
		OR
	Minutes	Reduce Duty Cycle
	Minutes	sduty1 5/95 / 187 478-A

3-3. Volt-Ampere Curves

The volt-ampere curves show the normal minimum and maximum voltage and amperage output capabilities of the welding power source. Curves of other settings fall between the curves shown.

Model 271	Model 273
MAX	MAX
MAX
MIN	MIN
MIN

Model 293

	MAX
MIN
Model 333	Model 383
	MAX
MAX
MIN	MIN
MIN

OM-223 194 Page 9

Image 13

Miller Electric 333, 271, 383, 293, 273 manual Duty Cycle And Overheating, Volt-Ampere Curves, Model

Contents

Processes OM-223 194E 2006−09Description From Miller to You Table of Contents Standards DirectivesDecstatMilan6/05 Arc Welding Hazards Symbol UsageElectric Shock can kill Fumes and Gases can be hazardous Welding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or kill California Proposition 65 Warnings EMF Information Principal Safety Standards Electric shock can kill − Definitions Falling unit can cause injury Where it could tipDo not move or operate unit Cylinders can expolde if Wear approved safety Electrical shock from wiringCan kill Working on this machine Specifications − Installation Volt-Ampere Curves Duty Cycle And OverheatingModel Installing Wire Spool and Adjusting Hub Tension Installing Gas Supply Electrical Service Guide Positoning Jumper Links 230/400V 3-Phase Models271 273 293 333 383 230 400 L2 L3 Aligning Drive Rolls and Wire Guide Installing Drive Rolls and Wire Guide Threading Welding Wire and Adjusting Pressure Roll Tension Setting Gun Polarity for Wire Type Optional Using Gun/Cable Holder Controls for Migmatic 271/273 − OperationControls for Migmatic 293/333 Spot Weld Timer Run-In, Burnback Optional and Spot Weld Timer ControlsControls for Migmatic Run-In Control Routine Maintenance − Maintenance &TROUBLESHOOTINGCircuit Breaker CB1 Unit Overload Check voltage switchs. Replace if necessary TroubleshootingReplace Z1 if necessary Nections. Check secondary voltages. Replace T1 if necessary OM-223 194 Circuit Diagram for Migmatic − Electrical Diagrams Circuit Diagram for Migmatic 273 400 VAC Circuit Diagram for Migmatic 293 400 VAC Circuit Diagram for Migmatic 333 400 VAC Circuit Diagram for Migmatic 383 400 VAC Wrapper Assembly, All Models − Parts List Part Description Quantity Main Assembly for Migmatic Dia Part Description Quantity Mkgs Main Assembly for Migmatic Dia Part Description Main Assembly for Migmatic PL2 Main Assembly for Migmatic PL1 Main Assembly for Migmatic TP1 Wire Drive and Gears 2 roll See Table Drive Roll & Wire Guide Kits Wire Drive and Gears 4 roll Drive Roll And Wire Guide Kits 4 Roll Models Drive Roll And Wire Guide Kits 2 Roll Models1.0 mm 1.2 mmPage Page Effective January 1 Your distributor and/or equipment manufacturer’s For assistance in filing or settling claims, contactTransportation Department