Miller Electric 152, 175 2-3. Duty Cycle And Overheating

OM-206 Page 10

2-3. Duty Cycle And Overheating

rduty1 5/95 – SB-121 591-B / SB-144 507-B / ST-157 356-B

Duty Cycle is percentage of 10 m in -

utes that unit can weld at rated load

without overheating.

YExceeding duty cycle can

damage unit and void

warranty.

minutes

When overheated, thermostat

opens, output stops, and cooling

fan keeps running.

Let fan run for

15 minutes. Start welding.

Overheating

A. 152 Model B. 175 Model

Continuous W elding

100% Duty Cycle At 120 Amperes For 152

Models; 140 Amperes For 175 Models

Contents

Main Maxstar 152 And 175 From Miller to You TABLE OF CONTENTS WARNING Page SECTION 1 SAFETY PRECAUTIONS - READ BEFORE USING 1-1. Symbol Usage . 1-2. Arc Welding Hazards ELECTRIC SHOCK can kill. ARC RAYS can burn eyes and skin. WELDING can cause fire or explosion. FLYING METAL can injure eyes. BUILDUP OF GAS can injure or kill. HOT PARTS can cause severe burns. 1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. FALLING UNIT can cause injury. OVERUSE can cause OVERHEATING STA TIC (ESD) can damage PC boards. 1-5. EMF Information OM-206 Page 5 SECTION 1 CONSIGNES DE SECURITE LIRE AVANT UTILISATION 1-1. Signification des symboles . 1-2. Dangers relatifs au soudage larc UN CHOC LECTRIQUE peut tuer. LES RAYONS DE LARC peuvent pro- voquer des brlures dans les yeux et sur la peau. LE SOUDAGE peut provoquer un incendie ou une explosion. DES PARTICULES VOLANTES peuvent blesser les yeux. LES ACCUMULATIONS DE GAZ ris- quent de provoquer des blessures ou mme la mort. DES PICES CHAUDES peuvent pro- voquer des brlures graves. 1-3. Dangers supplmentaires en relation avec linstallation, le fonctionnement et la maintenance 1-4. Principales normes de scurit 1-5. Information sur les champs lectromagntiques SECTION 2 SPECIFICATIONS Unless otherwise noted, the 175 model is shown throughout this manual. 2-2. Volt-Ampere Curves A. 152 Model B. 175 Model 2-1. Specifications 2-3. Duty Cycle And Overheating A. 152 Model B. 175 Model SECTION 3 INSTALLATION 3-1. Selecting A Location Duty Cycle 60 Thru 100% (105 m) 400 ft (90 m) 350 ft 3-4. Connecting To Weld Output Receptacles 3-5. Remote 14 Receptacle Information And Connections 3-6. Remote 14 Socket Information Socket InformationSocket* A/V 3-7. Connecting Input Power To 152 Models 3-8. Electrical Service Guide For 152 Ampere Models 3-9. Connecting Input Power To 175 Models 3-10. Electrical Service Guide For 175 Ampere Models SECTION 4 OPERATION 4-1. Controls 4-2. Output (Contactor) Switch 4-3. Amperage Controls 4-4. Weld Process Switch 4-5. Lift-Arc Switch 4-6. Power Switch And Pilot Light SECTION 5 MAINTENANCE & TROUBLESHOOTING 5-1. Routine Maintenance 3 Months 6 Months 3 Months 5-2. Measuring Input Capacitor Voltage 5-3. Troubleshooting Trouble Remedy Page Page Page SECTION 7 SELECTING AND PREPARING TUNGSTEN ELECTRODE 7-1. Selecting Tungsten Electrode 7-2. Preparing Tungsten For AC Or DC Electrode Positive (DCEP) Welding 7-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding SECTION 8 GUIDELINES FOR TIG WELDING (GTAW) 8-1. Positioining The Torch 8-2. Torch Movement During Welding 8-3. Positioning Torch Tungsten For Various Weld Joints SECTION 9 PARTS LIST Page Page . Page Page Page Warranty Questions? Call 1-800-4-A-MILLER for your local Miller distributor. Effective January 1, 2000 (Equipment with a serial number preface of LA or newer) Please complete and retain with your personal records. For Service Always provide Model Name and Serial/Style Number. Owners Record