Miller S-74DX Owner's Manual
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Miller S-74DX Owner's Manual

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S-74DX
CE
OM-1500-9
207749AF
2017−02
Processes
MIG (GMAW) Welding
Flux Cored (FCAW) Welding
(Gas- And Self-Shielded)
Description
Wire Feeder
File: MIG (GMAW)

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Summary of Contents for Miller S-74DX

  • Page 1 OM-1500-9 207749AF 2017−02 Processes MIG (GMAW) Welding Flux Cored (FCAW) Welding (Gas- And Self-Shielded) Description Wire Feeder S-74DX For product information, File: MIG (GMAW) Owner’s Manual translations, and more, visit www.MillerWelds.com/ams...
  • 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 4 DECLARATION OF CONFORMITY for European Community (CE marked) products. MILLER Electric Mfg. Co., 1635 Spencer Street, Appleton, WI 54914 U.S.A. declares that the product(s) identified in this declaration conform to the essential requirements and provisions of the stated Council Directive(s) and Standard(s).

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

    SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING som 2015−09 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 Remove stick electrode from holder or cut off welding wire at FUMES AND GASES can be hazardous. contact tip when not in use. D Wear body protection made from durable, flame−resistant material Welding produces fumes and gases. Breathing (leather, heavy cotton, wool). Body protection includes oil-free these fumes and gases can be hazardous to your clothing such as leather gloves, heavy shirt, cuffless trousers, high health.

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

    1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. MOVING PARTS can injure. D Do not install or place unit on, over, or near D Keep away from moving parts such as fans. combustible surfaces. D Keep all doors, panels, covers, and guards D Do not install unit near flammables.

  • Page 8: California Proposition 65 Warnings

    1-4. California Proposition 65 Warnings Welding or cutting equipment produces fumes or gases This product contains chemicals, including lead, known to which contain chemicals known to the State of California to the state of California to cause cancer, birth defects, or other cause birth defects and, in some cases, cancer.

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

    SECTION 2 − CONSIGNES DE SÉCURITÉ − LIRE AVANT UTILISATION fre_som_2015−09 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 chauffement ou un incendie. Avant de commencer le soudage, vérifier LES PIÈCES CHAUDES peuvent et s’assurer que l’endroit ne présente pas de danger. provoquer des brûlures. D Déplacer toutes les substances inflammables à une distance de 10,7 m de l’arc de soudage. En cas d’impossibilité les recouvrir D Ne pas toucher à...

  • Page 11: Dangers Supplémentaires En Relation Avec L'installation, Le Fonctionnement Et La Maintenance

    déroule du soudage à l’arc, du soudage par points, du gougeage, D Placer les bouteilles debout en les fixant dans un support station- de la découpe plasma ou une opération de chauffage par naire ou dans un porte-bouteilles pour les empêcher de tomber ou induction.

  • Page 12: Proposition Californienne 65 Avertissements

    D N’utiliser que les pièces de rechange recommandées par le LE SOUDAGE À L’ARC risque de constructeur. provoquer des interférences. D Effectuer l’installation, l’entretien et toute intervention selon les manuels d’utilisateurs, les normes nationales, provinciales et de D L’énergie électromagnétique risque l’industrie, ainsi que les codes municipaux.

  • 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 Do not weld on drums or any closed containers. Safe64 2012−06 Do not remove or paint over (cover) the label. Safe20 2012−05 Drive rolls can injure fingers. Safe32 2012−05 Welding wire and drive parts are at welding voltage during operation − keep hands and metal objects away. Safe33 2012−05 Environmental Protection Use Period (China) Safe123 2016−06...

  • 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 Variable Output Inductance Hertz Duty Cycle Preflow Time Set Up Input Line Connection Increase Conventional Constant Current...

  • Page 16: Section 4 − Specifications

    SECTION 4 − SPECIFICATIONS 4-1. Serial Number And Rating Label 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 C. China EEP Hazardous Substance Information   ‡ China EEP Hazardous Substance Information Ö Hazardous Substance Component Name × (if applicable) PBDE Ö Brass and Copper Parts Coupling Devices Switching Devices Ö Cable and Cable Accessories Batteries SJ/T 11364 This table is prepared in accordance with China SJ/T 11364.

  • Page 18: Section 5 − Installation

    SECTION 5 − INSTALLATION 5-1. Selecting A Location Do not put feeder where welding wire hits cylinder. Wire feeder shown is repre- sentative only and may not reflect actual unit. Wire Feeder Rubber Feet Choose slot that allows all rubber feet to sit securely on top of welding power source.

  • Page 19: Rear Panel Connections And Rotating Drive Assembly

    5-2. Rear Panel Connections And Rotating Drive Assembly 14-Pin Control Cable − 10 ft (3.0 m) Shielding Gas Valve Fitting Requires fitting with 5/8-18 right- hand threads. Connect customer- supplied gas hose. Shielding gas pressure not to exceed 100 PSI (689 kPa). Weld Cable Terminal Weld Cable Drive Assembly...

  • Page 20: 14-Pin Plug Information

    5-3. 14-Pin Plug Information Pin* Pin Information 24 volts AC with respect to socket G. Contact closure to A completes 24 volts AC contactor control circuit. Circuit common for 24 volts AC circuit. +10 volts DC input from power source to wire feeder with respect to socket D. Remote control circuit common.

  • Page 21: Installing And Threading Welding Wire

    5-5. Installing And Threading Welding Wire Install wire guides and Install wire spool. Adjust tension nut so anti-wear guide. wire is taut when wire feed stops. Install drive rolls. Pressure Indicator Scale Pressure Adjust Rear Pressure Rolls Adjust Front Rolls No Wire Slip Wire Slips NONCONDUCTIVE...

  • Page 22: Power Source Selection Menu

    5-6. Power Source Selection Menu Upper Display Lower Display When the feeder is turned on, the Power Source Selection Menu allows the operator to se- lect a default power source. Selecting a default power source, automatically sets the correct Vmin and Vmax set- tings for adjusting the output voltage of the power source.

  • Page 23: Section 6 − Operation

    SECTION 6 − OPERATION 6-1. Operational Terms The following is a list of terms and their definitions as they apply to this wire feeder: General Terms: Cold Wire Jog Feeding wire without contactor or gas valve being energized. Sequence A portion of the weld program, such as preflow, run-in, start, weld, crater, burnback, and postflow. Weld Program A group of sequences that make up a weld cycle.

  • Page 24: Program Push Button

    6-4. Program Push Button Program Display The number of the active program is displayed. Program Push Button Press button to activate program select feature. To change the pro- gram number, press the Program push button and rotate the Adjust control. Program Push Button LED The LED lights to indicate the Pro- gram push button is active.

  • Page 25: Lower Display

    6-6. Lower Display Lower Display to indicate that information displayed can be just control is activated while welding, the changed by the Adjust control. unit displays and permits adjustment of the The lower display shows wire speed or weld sequence wire feed speed regardless Wire Speed LED amperage.

  • Page 26: Adjust Control

    6-8. Adjust Control Adjust Control The Adjust control is used to change various sequence parame- ters, and to select various se- quences. Refer to the section for the function in question for informa- tion related to using the Adjust con- trol.

  • Page 27: Auxiliary Menus

    6-10. Auxiliary Menus Program Display Program Push Button Sequence Push Button Upper Display Upper Display Push Button Lower Display Lower Display Push Button Adjust Control Setup Push Button 6-10 Auxiliary Menus (Continued) Reset To Factory Settings cates “VMIN”. When the Setup push button Arc time is indicated by the Program display is pressed the unit displays the maximum showing “HR”.
  • Page 28 6-10 Auxiliary Menus (Continued) Trigger Hold Setup operator to select programs during preflow by the upper display and “OPT1” in the lower dis- clicking the trigger (pulling and releasing the play. • If the Setup push button is pressed, the unit trigger in a maximum of 0.2 seconds).

  • Page 29: Jog/Purge

    6-11. Jog/Purge Adjust Control Gun Trigger Receptacle Jog/Purge Push Button 805 082-A Pressing the Jog/Purge switch allows the op- trigger is still activated after two minutes, the unit displays jog speed when the unit is be- erator to jog wire without energizing the weld jog operation is terminated to prevent com- ing jogged.

  • Page 30: Section 7 − Setting Sequence Parameters

    SECTION 7 − SETTING SEQUENCE PARAMETERS 7-1. Sequence Parameters In A Program For more information on Sequence Push Button see Section 6-9. If time is set to zero in Weld sequence, welding continues until Sequence Parameters gun trigger is released. If time is set to zero in any timed Volts Seconds...

  • Page 31: Section 8 − Setting Dual Schedule Parameters

    SECTION 8 − SETTING DUAL SCHEDULE PARAMETERS 8-1. Optional Dual Schedule Switch Diagrams Maint 2P (Maintained-Contact 2-Pole Switch) Maint 1P (Maintained-Contact 1-Pole Switch) DSS-9 DSS-8 SECTION 9 − MAINTENANCE 9-1. Routine Maintenance Maintain more often Disconnect power before maintaining. during severe conditions. 3 Months Clean and Repair or...

  • Page 32: Diagnostics

    9-2. Diagnostics Wrapper Motor Control Board PC1 LED3 DIP Switch S1 There is a two-position DIP switch S1 located on motor control board PC1. These switches are factory-set in the off position and must remain in that position for the unit to op- erate correctly.
  • Page 33 SECTION 10 − ELECTRICAL DIAGRAM Figure 10-1. Circuit Diagram 235 601-C OM-1500-9 Page 29...

  • Page 34: Section 10 − Electrical Diagram

    SECTION 11 − PARTS LIST Hardware is common and not available unless listed. 4 Fig. 11-3 22 Fig. 11-2 805 083-B Figure 11-1. Main Assembly OM-1500-9 Page 30...
  • Page 35 Item Part Description Quantity Figure 11-1. Main Assembly ....159647 Insulator, Motor Clamp ......... . .

  • Page 36: Section 11 − Parts List

    Hardware is common and not available unless listed. 805 084-B Figure 11-2. Control Box Item Diagram Part marking Description Quantity Figure 11-2. Control Box (Figure 11-1 Item 21) ....238514 Wrapper, Feeder W/Label .
  • Page 37 Item Diagram Part marking Description Quantity Figure 11-2. Control Box (Figure 11-1 Item 21) (Continued) ....200295 Switch, Rocker Spdt 15A 12V (On)-Off-(On) ......
  • Page 38 Hardware is common and not available unless listed. View is backside of front panel 256 396-C Figure 11-3. Front Panel Assembly With Gouge Option Item Diagram Part marking Description Quantity Figure 11-3. Front Panel Assembly With Gouge Option ..
  • Page 39 Notes OM-1500-9 Page 35...
  • Page 40 Hardware is common and not available unless listed. See Table 11-1 For Drive Roll & Wire Guide Kits 803790−D Figure 11-4. Drive Assembly, Wire Item Diagram Part marking Description Quantity Figure 11-4. Drive Assembly, Wire (Figure 11-1 Item 4) ..
  • Page 41 Item Diagram Part marking Description Quantity Figure 11-4. Drive Assembly, Wire (Figure 11-1 Item 4) (continued) ....182155 ..Spring .
  • Page 42 Table 11-1. Drive Roll And Wire Guide Kits OM-1500-9 Page 38...
  • Page 43 Effective January 1, 2017 (Equipment with a serial number preface of MH or newer) This limited warranty supersedes all previous Miller warranties and is exclusive with no other guarantees or warranties expressed or implied. Warranty Questions? LIMITED WARRANTY − Subject to the terms and conditions below, 6 Months —...
  • Page 44 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 2017 Miller Electric Mfg. Co. 2017−01...

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