Duty Cycle And Overheating, CC Mode CV Mode | Miller Electric 812

. A complete Parts List is available at www.MillerWelds.com

4-2. 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 duty cycle before welding.

NOTICE − Exceeding duty cycle can damage unit and void warranty.

100% Duty Cycle

Continuous Welding

Overheating	A/V
0	A/V
	15
	OR
Minutes	Reduce Duty Cycle
Minutes

168 918

4-3. Volt-Ampere Curves

Volt-ampere curves show mini- mum and maximum voltage and amperage output capabilities of unit. Curves of other settings fall be- tween curves shown.

*High inductance connection.

A. *CC Mode

B. CV Mode

DC Volts

80

70

60

50

40

30

20

10

SMAW

ARC FORCE

SMAW

GTAW

SMAW

ARC FORCE

DC Volts

70	MAX	GMAW

		FCAW
60

50

40

MED

30

20

10

MIN

0 0	MIN		MAX			MIN	MAX
0 0	100	200	300	400	500	600	700 800	900	1000

DC Amperes

00 100 200 300 400 500 600 700 800 900 1000

DC Amperes

168 916-A / 168 917-A

OM-278 Page 11

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Miller Electric 812, 652 manual Duty Cycle And Overheating, Volt-Ampere Curves, CC Mode CV Mode, 100% Duty Cycle

Contents

Description ProcessesFile Multi-Process From Miller to You Table of Contents Standards DirectivesDecstat6/05 HOT Parts can cause severe burns Symbol UsageArc Welding Hazards Electric Shock can kill Flying Metal or Dirt can injure eyes Fumes and Gases can be hazardousARC Rays can burn eyes and skin Welding can cause fire or explosion Moving Parts can cause injury Welding Wire can cause injuryFire or Explosion hazard Falling Unit can cause injury About Implanted Medical Devices Principal Safety StandardsCalifornia Proposition 65 Warnings EMF Information UNE Décharge Électrique peut entraîner la mort Symboles utilisés LES Fumées ET LES GAZ peuvent être dangereux DES Pièces Chaudes peuvent provoquer des brûlures gravesLE 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- Sion LES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLE Soudage À L’ARC risque de provoquer des interférences Information EMF Principales normes de sécuritéEn ce qui concerne les implants médicaux OM-278 − Definitions General Precautionary Label ? a Nameplate Safety SymbolsInput Connection Label Electric Shock And Airflow Label Weee Label For Products Sold Within The EU Manufacturer’s Rating Label For CE Products Symbols And Definitions − InstallationSpecifications 100% Duty Cycle CC Mode CV ModeDuty Cycle And Overheating Volt-Ampere Curves Movement Location And Airflow Selecting a Location460 mm OM-278 Holes Front Dimensions And WeightsDimensions Weight VAC Receptacle And Supplementary Protectors TippingWeld Output Terminals Selecting Cable Sizes Connecting Weld Output Cables Gas Flowmeter Regulator Mig Gmaw Cable Connections Fcaw Gasless Turn Off power before making connectionsRear Wire Feeder Mig Gmaw And Flux Cored Fcaw Cable Connections Information To remote On/Off switchTIG Gtaw Cable Connections Remote 14 Receptacle RC8 Information Electrical Service Guide Connecting Remote Control Tools Needed Do not overtighten Jumper link nuts Placing Jumper Links = GND/PE Earth Ground Connecting Input PowerWelding Power Source Input Power Con- nections Disconnect Device Input Power Connec- tions Controls Non CE Models − Operation Controls CE Models Short Circuit Shutdown − Maintenance & TroubleshootingRoutine Maintenance Fuse F1 Trouble Remedy Troubleshooting Circuit Diagram − Electrical Diagram 218 514-B Recommended Spare Parts − Parts ListRecommended Spare Parts Page Page Your distributor also gives ServiceSupport 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