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Miller AC 251 Stick Owner's Manual

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OM-194 414
May 1999
Effective with serial number:
151970
Processes
Stick (SMAW) Welding
Description
AC 251 Stick
Visit our website at
www.MillerWelds.com

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Summary of Contents for Miller AC 251 Stick

  • Page 1 OM-194 414 May 1999 Effective with serial number: 151970 Processes Stick (SMAW) Welding Description AC 251 Stick Visit our website at www.MillerWelds.com...
  • Page 2 1929. This Owner’s Manual is designed to help you get the most out of your Miller products. Please take time to read the Safety precautions. They will help you protect yourself against potential hazards on the worksite. We’ve made installation and operation quick and easy.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 – SAFETY PRECAUTIONS FOR ARC WELDING ... . 1-1. Symbol Usage ..........1-2.
  • Page 4 Via Privata Iseo, 6/E Indirizzo Costruttore: 20098 San Giuliano Milanese, Italy Declares that this product: AC 251 Stick Dichiara che il Prodotto: Conforms to the following Directives and Standards: È Conforme alle seguenti Direttive e Norme. Direttive Electromagnetic Compatibility Directives: 89/336/EEC Compatibilità...

  • Page 5: Section 1 - Safety Precautions For Arc Welding

    SECTION 1 – SAFETY PRECAUTIONS FOR ARC WELDING safety_stickom1 6/95 1-1. Symbol Usage Y Marks a special safety message. Means Warning! Watch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols. Means NOTE; not safety related. This group of symbols means Warning! Watch Out! possible ELECTRIC SHOCK, MOVING PARTS, and HOT PARTS hazards.

  • Page 6: Additional Installation, Operation, And Maintenance Hazards

    1. Protect compressed gas cylinders from excessive heat, CYLINDERS can explode if damaged. mechanical shocks, slag, open flames, sparks, and arcs. Shielding gas cylinders contain gas under high 2. Keep cylinders away from any welding or other electrical circuits. pressure. If damaged, a cylinder can explode. Since gas cylinders are normally part of the welding 3.

  • Page 7: Section 2 - Installation

    SECTION 2 – INSTALLATION 2-1. Specifications Amperes Input at Maximum Input Voltage Rated Load Output, Rated Welding Output Weight Open-Circuit Used Range AC Rating 50/60 Hz, Single-Phase Voltage AC Voltage AC 230 V 400 V 190 A @ 27 Volts AC, 230 V 35–195 A 50–68 V...

  • Page 8: Selecting A Location

    2-3. Selecting A Location Rating Label Use rating label to determine input power needs. Line Disconnect Device Locate unit near correct input pow- er supply. Y Special installation may be required where gasoline or volatile liquids are present – see NEC Article 511 or CEC Section 20.

  • Page 9: Weld Output Terminals And Selecting Cable Sizes

    2-5. Weld Output Terminals And Selecting Cable Sizes Total Cable (Copper) Length In Weld Circuit Not Exceeding 150 ft 200 ft 250 ft 300 ft 350 ft 400 ft 100 ft (30 m) Or Less (45 m) (60 m) (70 m) (90 m) (105 m) (120 m)

  • Page 10: Connecting Input Power

    2-7. Connecting Input Power Check input voltage available at site. Input And Grounding Conductors Line Disconnect Device Select size and type of overcurrent protection using Section 2-6. Y Always connect green/yel- low wire to supply ground- ing terminal, never to a line terminal.

  • Page 11: Section 3 - Operation

    SECTION 3 – OPERATION 3-1. Controls Welding Current Control 68 Volt Weld Output Terminal 50 Volt Weld Output Terminal Ground Terminal 230V 400V Overload Protection Light On/Off Switch And Input Voltage Selector SECTION 4 – MAINTENANCE AND TROUBLESHOOTING 4-1. Routine Maintenance Y Disconnect power Maintain more often before maintaining.

  • Page 12: Troubleshooting

    4-2. Troubleshooting Trouble Remedy No weld output; unit completely inop- Be sure Power switch is On (see Section 3-1). erative. Be sure line disconnect switch is On (see Section 2-7). Check line fuse(s) and replace if necessary (see Sections 2-7). Check for proper input power connections (see Sections 2-6 and/or 2-7).

  • Page 13: Section 5 - Electrical Diagrams

    SECTION 5 – ELECTRICAL DIAGRAMS U/T1 R/L1 U1/T4 O.L. V/T2 V1/T5 S/L2 Ref. S-142 310 Figure 5-1. Circuit Diagram OM-194 414 Page 9...

  • Page 14: Section 6 - Parts List

    SECTION 6 – PARTS LIST Hardware is common and not available unless listed. Figure 6-1. Parts View OM-194 414 Page 10...
  • Page 15 Qty. Item Ref. Code 156002028 ZI.0.0.3 156122024 ZI.0.0.6 156118026 ZI.0.0.4 056020040 VP.0.0.13 056072068 ZH.0.0.4 756009054 ZG.0.0.5 056020054 ZI.0.0.11 056002012 ZI.0.0.5 656110009 ZI.0.0.10 156006016 ZI.0.0.9 056091041 QF.0.0.12 056059264 ZI.1.1.1 556019046 ZI.0.0.2 057029008 ZI.1.1 058021107 ZI.1 056159013 ZH.0.0.3 PRI COIL 057015082 ZI.1.2 V.
  • Page 16 Notes OM-194 414 Page 12...
  • Page 19 Effective January 1, 1999 This limited warranty supersedes all previous Miller warranties and is exclusive with no other guarantees or warranties expressed or implied. LIMITED WARRANTY – Subject to the terms and conditions APT, ZIPCUT & PLAZCUT Model Plasma Cutting below, Miller Electric Mfg.
  • Page 20 Phone: 414-735-4505 USA & Canada FAX: 920-735-4134 International FAX: 920-735-4125 European Headquarters – United Kingdom Phone: 44 (0) 1204-593493 FAX: 44 (0) 1204-598066 Miller Europe Italy Phone: 39 (0) 2982901  PRINTED IN USA 1999 Miller Electric Mfg. Co. 7/99...

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