Miller D-74 Owner's Manual
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Miller D-74 Owner's Manual

Miller D-74 Owner's Manual

Mpa plus swingarc w/drives
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D-74 MPa Plus Swingarc
w/Drives
OM-254063M
2024−05
Processes
MIG (GMAW) Welding
Flux Cored (FCAW) Welding
(Gas-and Self-Shielding)
Submerged Arc (SAW) Welding
Description
Wire Feeder
(Use with CV Power Sources)
8 ft, 12 ft, and 16 ft
File: MIG (GMAW)

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Summary of Contents for Miller D-74

  • Page 1 Flux Cored (FCAW) Welding (Gas-and Self-Shielding) Submerged Arc (SAW) Welding Description Wire Feeder (Use with CV Power Sources) D-74 MPa Plus Swingarc w/Drives 8 ft, 12 ft, and 16 ft For product information, File: MIG (GMAW) Owner’s Manual translations, and more, visit...
  • Page 2 We know you don’t have time to do it any other way. That’s why when Niels Miller first started building arc welders in 1929, he made sure his products offered long-lasting value and superior quality.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING ........1-1.

  • Page 5: Section 1 − Safety Precautions - Read Before Using

    SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING som 2024−01 Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions. 1-1. Symbol Usage DANGER! − Indicates a hazardous situation which, if Indicates special instructions.
  • Page 6 D Be aware that welding on a ceiling, floor, bulkhead, or partition can FUMES AND GASES can be hazardous. cause fire on the hidden side. D Do not cut or weld on tire rims or wheels. Tires can explode if heat- ed.

  • Page 7: Additional Hazards For Installation, Operation, And Maintenance

    D Never weld on a pressurized cylinder − explosion will result. CYLINDERS can explode if damaged. D Use only correct compressed gas cylinders, regulators, hoses, and fittings designed for the specific application; maintain them Compressed gas cylinders contain gas under high and associated parts in good condition.

  • Page 8: California Proposition 65 Warnings

    H.F. RADIATION can cause interference. ARC WELDING can cause interference. D High-frequency (H.F.) can interfere with radio D Electromagnetic energy can interfere with navigation, safety services, computers, and sensitive electronic equipment such as communications equipment. computers and computer-driven equipment such as robots. D Have only qualified persons familiar with electronic equipment D Be sure all equipment in the welding area is electromagnetically perform this installation.

  • Page 9: Section 2 − Consignes De Sécurité − Lire Avant Utilisation

    SECTION 2 − CONSIGNES DE SÉCURITÉ − LIRE AVANT UTILISATION som_2024−01_fre Pour écarter les risques de blessure pour vous−même et pour autrui — lire, appliquer et ranger en lieu sûr ces consignes relatives aux précautions de sécurité et au mode opératoire. 2-1.
  • Page 10 D Ne pas toucher aux pièces chaudes, utiliser les outils recomman- D Se protéger et d’autres personnes de la projection d’étincelles et dés et porter des gants de soudage et des vêtements épais pour de métal chaud. éviter les brûlures. D Des étincelles et des matériaux chauds du soudage peuvent facilement passer dans d’autres zones en traversant de petites LES FUMÉES ET LES GAZ peuvent...

  • Page 11: Symboles De Dangers Supplémentaires En Relation Avec L'installation

    D Protéger les bouteilles de gaz comprimé d’une chaleur excessive, Les CHAMPS ÉLECTROMAGNÉTIQUES (CEM) des chocs mécaniques, des dommages physiques, du laitier, des peuvent affecter les implants médicaux. flammes ouvertes, des étincelles et des arcs. D Placer les bouteilles debout en les fixant dans un support station- D Les porteurs de stimulateurs cardiaques et naire ou dans un porte-bouteilles pour les empêcher de tomber ou autres implants médicaux doivent rester à...

  • Page 12: Proposition Californienne 65 Avertissements

    D Effectuer régulièrement le contrôle et l’entretien de l’installation. LIRE LES INSTRUCTIONS. D Maintenir soigneusement fermés les portes et les panneaux des sources de haute fréquence, maintenir les éclateurs à une distan- D Lire et appliquer les instructions sur les ce correcte et utiliser une terre et un blindage pour réduire les étiquettes et le Mode d’emploi avant l’instal- interférences éventuelles.

  • Page 13: Section 3 − Definitions

    SECTION 3 − DEFINITIONS 3-1. Additional Safety Symbols And Definitions Some symbols are found only on CE products. Warning! Watch Out! There are possible hazards as shown by the symbols. Safe1 2012−05 Do not discard product (where applicable) with general waste. Reuse or recycle Waste Electrical and Electronic Equipment (WEEE) by disposing at a designated collection facility.
  • Page 14 Welding sparks can cause fires. Have a fire extinguisher nearby, and have a watchperson ready to use it. Safe63 2012−06 Do not weld on drums or any closed containers. Safe16 2017−04 Do not remove or paint over (cover) the label. Safe20 2017−04 Drive rolls can injure fingers.

  • Page 15: Miscellaneous Symbols And Definitions

    3-2. Miscellaneous Symbols And Definitions Some symbols are found only on CE products. Rated Welding Amperes Three Phase Current Direct Current Primary Voltage (DC) Program Degree Of Protection Output Variable Inductance Hertz Duty Cycle Set Up Preflow Time Input Increase Line Connection Constant Current Process...

  • Page 16: Section 4 − Specifications

    SECTION 4 − SPECIFICATIONS 4-1. Serial Number And Stock Number Location The serial number and rating information for this product is located on the rear panel. Use rating label to determine input power requirements and/or rated output. For future reference, write serial number in space provided on back cover of this manual. 4-2.

  • Page 17: Section 5 − Installation

    SECTION 5 − INSTALLATION 5-1. Installing Swivel Into Pipe Post Do not remove Safety Collar until instructed to. Swingpak Base or CBC Cart Pipe Post With Base Steel Bolt Secure as shown using as a mini- mum 1/2 in. diameter SAE grade 5 steel bolts.

  • Page 18: Installing Boom And Reel Support

    5-3. Installing Boom And Reel Support Swivel Plates Yoke Remove hardware from swivel plates and yoke. Boom Set boom into swivel as shown. Yoke Pin Install pin through yoke. Install cot- ter pin and spread ends. Bolt Install bolt, washers, and nut. Tight- en hardware, and back bolt off one half turn.

  • Page 19: Equipment Connection Diagram

    5-5. Equipment Connection Diagram Turn power before connecting to weld terminal or receptacle. Failure to properly connect weld cables may cause excessive heat and start a fire, damage your machine. Welding Power Source Remote 14 Connection Negative (−) Weld Output Cable Positive (+) Weld Output Cable...

  • Page 20: Control Box Connections

    5-6. Control Box Connections Interconnecting Cables 14 Pin Receptacle Power Connector 19 Pin Receptacle Ref. 252426-C / 252428-D 5-7. 14-Pin Plug Information For Connecting Wire Feeder To Power Source Pin* Pin Information 24 volts AC with respect to socket G. Contact closure to A completes 24 volts AC contactor control circuit.

  • Page 21: Removing Safety Collar And Adjusting Boom

    5-8. Removing Safety Collar And Adjusting Boom Locking Knob Tighten knob to prevent boom movement. Loosen knob to allow boom movement. Change knob po- sition to limit upward movement. Pull boom down slightly and re- move safety collar. Boom should balance in any position from hori- zontal to 60 degrees above hori- zontal.

  • Page 22: Installing Wire Guides And Drive Rolls

    5-10. Installing Wire Guides And Drive Rolls Tools Needed: 3/16 in. Open spring shaft carrier. Install inlet guide so groove is centered with When changing wire size or type, screw, and secure guide screw. Drive Roll check drive roll and guide size (see NO TAG).

  • Page 23: Installing Welding Gun

    5-12. Installing Welding Gun Gun Locking Tab Power Clamp Knob Gun Connection End Power Pin Groove Installing gun with Accu-Mate connection Loosen power clamp knob to allow power pin of gun to clear the gun locking tab. Push power pin into power clamp as far as possible to align the groove in the power pin of the gun with the gun locking tab.

  • Page 24: Installing And Threading Welding Wire

    5-13. Installing And Threading Welding Wire Install wire guides and anti-wear guide. Install drive rolls. Pressure Indicator Pressure Scale Adjust Rear Pressure Rolls Adjust Front Rolls No Wire Slip Wire Slips NONCONDUCTIVE NONCONDUCTIVE SURFACE SURFACE Tools Needed: Drive Rolls 3/16, 5/64 in. Back Of Gun 15/16, 3/8 in.

  • Page 25: Section 6 − Maintenance & Troubleshooting

    SECTION 6 − MAINTENANCE & TROUBLESHOOTING 6-1. Routine Maintenance Maintain more often Disconnect power before maintaining. during severe conditions. Reference n = Check Z = Change ~ = Clean l = Replace * To be done by Factory Authorized Service Agent 3 Months l Unreadable Labels ~ Weld Terminals...

  • Page 26: Troubleshooting

    6-3. Troubleshooting Disconnect power before troubleshooting. Trouble Remedy Wire feeds, shielding gas flows, but elec- Check interconnecting cord connections. If secure, check cord for continuity and repair or replace (see trode wire is not energized. Sections 5-5 and 5-6). Wire feeder is on, meter(s) do not light Check and reset circuit breaker at welding power source.

  • Page 27: Section 7 − Electrical Diagrams

    SECTION 7 − ELECTRICAL DIAGRAMS Figure 7-1. Circuit Diagram For Motor/Gas Box 242 330-A Figure 7-2. Circuit Diagram For MPa Plus Motor/Gas Box 250 821-A OM-254063 Page 23...
  • Page 28 Notes...
  • Page 29 Notes...
  • Page 30 Notes...
  • Page 31 Effective January 1, 2024 (Equipment with a serial number preface of NE or newer) 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 Subarc Wire Drive Assemblies below, Miller Electric Mfg.

  • Page 32: Owner's Record

    Contact the Delivering Carrier to: File a claim for loss or damage during shipment. For assistance in filing or settling claims, contact your distributor and/or equipment manufacturer’s Transportation Department. © ORIGINAL INSTRUCTIONS − PRINTED IN USA 2024 Miller Electric Mfg. LLC 2024−01...

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