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Miller Electric CST 250 SECTION 5 MAINTENANCE AND TROUBLESHOOTING

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OM-2237 Page 23

SECTION 5 − MAINTENANCE AND TROUBLESHOOTING

5-1. Routine Maintenance

Disconnect power before maintaining.

Maintain more often during severe conditions.

3 Months

Replace

unreadable

labels.

Clean and tighten

weld terminals. Replace Damaged

Gas Hose

3 Months

Repair Or Replace

Cracked Cables

And Cords

6 Months

Blow out inside. During

heavy service clean

monthly.

Do not remove case when

blowing out inside of unit

(see Section 5-2) .

5-2. Blowing Out Inside Of Unit

Do not remove case when

blowing out inside of unit.

To blow out unit, direct airflow

through front and back louvers as

shown.

803 080

Contents

Main CST 250 From Miller to You TABLE OF CONTENTS Page SECTION 1 SAFETY PRECAUTIONS - READ BEFORE USING 1-1. Symbol Usage 1-2. Arc Welding Hazards ELECTRIC SHOCK can kill. SIGNIFICANT DC VOLTAGE exists after removal of input power on inverters. 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 STATIC (ESD) can damage PC boards. 1-5. Principal Safety Standards 1-6. EMF Information OM-2237 Page 5 SECTION 2 CONSIGNES DE SCURIT LIRE AVANT UTILISATION 2-1. Signification des symboles 2-2. Dangers relatifs au soudage larc LES DCHARGES LECTRIQUES peuvent tre mortelles. LES FUMES ET LES GAZ peuvent tre dangereux. LES RAYONS DE LARC peuvent cau- ser des brlures oculaires et cuta- nes. LE SOUDAGE peut causer un incen- die ou une explosion. LES PARTICULES PROJETES peu- vent blesser les yeux. LES ACCUMULATIONS DE GAZ peu- vent causer des blessures ou mme la mort. LES PICES CHAUDES peuvent cau- ser des brlures graves. 2-3. Autres symboles relatifs linstallation, au fonctionnement et lentretien de lappareil. 2-4. Principales normes de scurit 2-5. Information sur les champs lectromagntiques SECTION 3 INSTALLATION 3-1. Specifications 3-2. Duty Cycle And Overheating A or V 3-3. Stick (SMAW) Volt-Ampere Curves xx10 Stick VA Curves xx18 Stick VA Curve 3-4. TIG (GTAW) Volt-Ampere Curve TIG VA Curve 3-5. Selecting A Location 3-6. Weld Output Terminals And Selecting Cable Sizes* + 3-7. TIG Lift-Arct DCEN (Direct Current Electrode Negative) Connections 3-8. Stick DCEP (Direct Current Electrode Positive) Connections 3-9. Electrical Service Guide NOTE 3-10. Selecting 230 Volts AC Single/Three Phase Input Voltage 3-11. Selecting 460 - 575 Volts AC Three Phase Input Voltage 1 For three-phase operation: For single-phase operation: 3 3-12. Connecting Input Power SECTION 4 OPERATION 4-1. Controls 4-2. Process Select Control RECOMMENDED PROCESS SELECTIONS VS ELECTRODE TYPE 4-3. Stick Start Procedure Scratch Start Technique 4-4. Lift-Arc Start Procedure 4-5. Amperage Control 4-6. Remote 14 Receptacle Information This unit is capable of being rack mounted [see rack Owners Manual, OM-2238 (208 107)]. 4-7. Fan-On-Demand 4-8. Rack Mounting SECTION 5 MAINTENANCE AND TROUBLESHOOTING 5-1. Routine Maintenance 3 Months 6 Months 5-2. Blowing Out Inside Of Unit 5-3. Troubleshooting Page Page SECTION 7 SELECTING AND PREPARING TUNGSTEN ELECTRODE NOTE 7-1. Selecting Tungsten Electrode 7-2. Safety Information About Tungsten 7-3. Preparing Tungsten For AC Or DC Electrode Negative (DCEN) Welding Page SECTION 8 PARTS LIST Figure 8-1. Main Assembly Page Page Page Page Page Page Page Page Warranty Questions? Call 1-800-4-A-MILLER for your local Miller distributor. Effective January 1, 2005 (Equipment with a serial number preface of LF or newer) Please complete and retain with your personal records. For Service Always provide Model Name and Serial/Style Number. Contact a DISTRIBUTOR or SERVICE AGENCY near you. Owners Record