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Miller Dialarc 250 AC/DC Manuel Du Propriétaire
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OM-321
202 730D
December 2003
Processes
Stick (SMAW) Welding
Description
Arc Welding Power Source
R
Dialarc 250/250P AC/DC
Visit our website at
www.MillerWelds.com

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Sommaire des Matières pour Miller Dialarc 250 AC/DC

  • Page 1 OM-321 202 730D December 2003 Processes Stick (SMAW) Welding Description Arc Welding Power Source Dialarc 250/250P AC/DC Visit our website at www.MillerWelds.com...
  • 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 SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING ........1-1.
  • Page 5 SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING som _8/03 1-1. Symbol Usage Means Warning! Watch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols. This group of symbols means Warning! Watch Out! possible Y Marks a special safety message.
  • Page 6 ARC RAYS can burn eyes and skin. BUILDUP OF GAS can injure or kill. D Shut off shielding gas supply when not in use. Arc rays from the welding process produce intense D Always ventilate confined spaces or use visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin.
  • Page 7 1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. MOVING PARTS can cause injury. 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 1-5. Principal Safety Standards Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1, Boulevard, Rexdale, Ontario, Canada (phone: from American Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126 800−463−6727 or in Toronto 416−747−4044, website: www.csa−in- (phone: 305-443-9353, website: www.aws.org). ternational.org).
  • Page 9 SECTION 2 − CONSIGNES DE SÉCURITÉ − À LIRE AVANT UTILISATION som_fre 8/03 2-1. Signification des symboles Signifie « Mise en garde. Faire preuve de vigilance. » Cette procédure présente des risques identifiés par les symboles adjacents aux directives. Ce groupe de symboles signifie « Mise en garde. Faire preuve de vigi- Y Identifie un message de sécurité...
  • Page 10 LES RAYONS DE L’ARC peuvent cau- LES ACCUMULATIONS DE GAZ peu- ser des brûlures oculaires et cuta- vent causer des blessures ou même nées. la mort. Le rayonnement de l’arc génère des rayons visibles et D Couper l’alimentation en gaz protecteur en cas de invisibles intenses (ultraviolets et infrarouges) suscep- non utilisation.
  • Page 11 2-3. Autres symboles relatifs à l’installation, au fonctionnement et à l’entretien de l’appareil. Risque D’INCENDIE OU D’EXPLO- LES ORGANES MOBILES peuvent SION causer des blessures. D Ne pas placer l’appareil sur une surface inflam- D Se tenir à l’écart des organes mobiles comme les mable, ni au−dessus ou à...
  • Page 12 2-4. Principales normes de sécurité Safety in Welding, Cutting, and Allied Processes, norme ANSI Z49.1, Rexdale, Rexdale (Ontario) Canada M9W 1R3 (téléphone : (800) de l’American Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126 463−6727 ou à Toronto : (416) 747−4044, site Web : www.csa−interna- (téléphone : (305) 443−9353, site Web : www.aws.org).
  • Page 13 SECTION 3 − INSTALLATION 3-1. Specifications Amperes Input At Rated Load Output, 60 Hz, Single-Phase Model Model 200 V 208 V 230 V 460 V 575 V AC @ 50% −− 43.1 39.0 19.5 15.6 250P 250P AC @ 30% −−...
  • Page 14 3-2. Duty Cycle And Overheating Duty Cycle is percentage of 10 min- utes that unit can weld at rated load without overheating. Y Exceeding duty cycle can damage unit void warranty. 30% Duty Cycle At 225 Amperes AC 3 Minutes Welding 7 Minutes Resting 50% Duty Cycle At 175 Amperes DC 5 Minutes Welding...
  • Page 15 3-4. Dimensions And Weights Dimensions Dimensions Height 24-1/4 in (616 mm) Width 19 in (483 mm) Length 28 in (711 mm) 3/4 in (19 mm) 26-1/2 in (673 mm) Front 27-1/4 in (692 mm) 28 in (711 mm) 7/8 (22 mm) 17-7/8 (454 mm) 19 (483 mm) 8 Holes...
  • Page 16 3-6. Weld 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) Welding 10 To 60%...
  • Page 17 3-8. Electrical Service Guide With Power Factor Correction Without Power Factor Correction 60 Hertz Models Input Voltage Input Amperes At Rated Output 66.0 59.6 29.8 23.9 92.4 80.4 40.2 32.1 Max Recommended Standard Fuse Rating In Amperes Time-Delay Normal Operating 3 Min Input Conductor Size In AWG/Kcmil Max Recommended Input Conductor Length In Feet (Meters)
  • Page 18 3-9. Placing Jumper Links Y Disconnect and lockout/tag- out input power before installing or moving jumper links. Check input voltage available at site. Remove side panel. Jumper Link Label Check label − only one is on unit. Jumper Links Move jumper links to match input voltage and label on unit.
  • Page 19 3-10. Connecting Input Power Y Disconnect and lockout/tag- out input power before con- necting input conductors from unit. Y Have only qualified persons make this installation. See rating label on unit and check Tools Needed: input voltage available at site. Line Disconnect Device Input Conductors 3/8, 7/16, 1/2 in...
  • Page 20 SECTION 4 − OPERATION 4-1. Controls 202 313-C Y Do not change position of switch Range Selector Switch Circuit Breaker CB1 while welding. If CB1 opens, weld output drops to the mini- Use switch to select ac or dc weld amperage mum of the range selected, and cannot be range.
  • Page 21 SECTION 5 − MAINTENANCE & TROUBLESHOOTING 5-1. Routine Maintenance Y Disconnect power Maintain more often before maintaining. during severe conditions. 3 Months Repair Or Replace Replace Unreadable Cracked Labels Weld Cable 3 Months 6 Months Clean Blow Out During Heavy Service, Tighten Vacuum...
  • Page 22 SECTION 6 − ELECTRICAL DIAGRAMS 202 718-A Figure 6-1. Circuit Diagram For 60 Hertz Models OM-321 Page 18...
  • Page 23 Notes OM-321 Page 19 Return To Table Of Contents...
  • Page 24 SECTION 7 − PARTS LIST Hardware is common and not available unless listed. Fig 7-4 Fig 7-2 802 879 Figure 7-1. Main Assembly OM-321 Page 20 Return To Table Of Contents...
  • Page 25 Item Dia. Part Description Mkgs. Quantity Figure 7-1. Main Assembly ... . 202 390 COVER, top ............
  • Page 26 Item Dia. Part Description Mkgs. Quantity 7-2. Panel, Front w/Components (Fig 7-1 Item 16) ......NAMEPLATE, (order by model and serial number) .
  • Page 27 Item Part Description Quantity 088 087 7-3. Switch, Range 2 Position (Fig 7-2 Item 3) ....072 026 BRACKET, mtg switch ..........
  • Page 31 Effective January 1, 2003 (Equipment with a serial number preface of “LC” or newer) This limited warranty supersedes all previous Miller warranties and is exclusive with no other Warranty Questions? guarantees or warranties expressed or implied. Call LIMITED WARRANTY − Subject to the terms and conditions Induction Heating Coils and Blankets below, Miller Electric Mfg.
  • Page 32 Distributor Address City State For Service Call 1-800-4-A-Miller or see our website at www.MillerWelds.com to locate a DISTRIBUTOR or SERVICE AGENCY near you. Always provide Model Name and Serial/Style Number. Contact your Distributor for: Welding Supplies and Consumables Options and Accessories...

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