Manuale d’uso / di manutenzione del prodotto Bobcat 250 del fabbricante Miller Electric
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Bobcat 250 Processes Description ™ Non-Critical TIG (GT A W) W elding Stick (SMAW ) Welding MIG (GMAW) Welding Flux Cored (FCA W ) W elding Engine Driven Welding Generator OM-4419 211 392M 2007 − 05 Visit our website at www.
Miller Electric manufactures a full line of welders and welding related equipment. For information on other quality Miller products, contact your local Miller distributor to receive the latest full line catalog or individual specification sheets. T o locate your nearest distributor or service agency call 1-800-4-A-Miller , or visit us at www .
T ABLE OF CONTENTS SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1. Symbol Usage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ABLE OF CONTENTS SECTION 8 − MAINTENANCE (ROBIN-POWERED UNITS) 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1. Routine Maintenance (Robin-Powered Units) 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OM-4419 Page 1 SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING rom_2007 − 04 Protect yourself and others from injury — read and follow these precautions. 1-1. Symbol Usage DANGER! − Indicates a hazardous situation which, if not avoided, will result in death or serious injury .
OM-4419 Page 2 W elding produces fumes and gases. Breathing these fumes and gases can be hazardous to your health. FUMES AND GASES can be hazardous. Keep your head out of the fumes. Do not breathe the fumes. If inside, ventilate the area and/or use local forced ventilation at the arc to remove welding fumes and gases.
OM-4419 Page 3 1-3. Engine Hazards BA TTER Y EXPLOSION can BLIND. Always wear a face shield, rubber gloves, and protective clothing when working on a battery . Stop engine before disconnecting or connect- ing battery cables or servicing battery .
OM-4419 Page 4 HOT MET AL from air arc cutting and gouging can cause fire or explosion. Do not cut or gouge near flammables. W atch for fire; keep extinguisher nearby . HOT P ARTS can cause burns and injury . Do not touch hot compressor or air system parts.
OM-4419 Page 5 H. F . RADIA TION can cause interference. High-frequency (H.F .) can interfere with radio navigation, safety services, computers, and communications equipment. Have only qualified persons familiar with electronic equipment perform this installation.
OM-4419 Page 6 SECTION 2 − CONSIGNES DE SÉCURITÉ − LIRE A V ANT UTILISA TION rom_2007 − 04fre Se protéger , ainsi que toute autre personne travaillant sur les lieux, contre les étincelles et le métal chaud.
OM-4419 Page 7 Une tension DC importante subsiste à l’intérieur des onduleurs après avoir coupé l’alimentation. Couper l’alimentation du poste et décharger les condensateurs d’entrée comme indiqué dans la Section Maintenance avant de toucher des composants.
OM-4419 Page 8 Suivre les recommandations dans OSHA 1910.252(a)(2)(iv) et N FPA 51B pour les travaux à chaud et avoir de la surveillance et un extincteur à proximité. LE BRUIT peut affecter l’ouïe. Le bruit des processus et des équipements peut affe c l’ouïe.
OM-4419 Page 9 Dévisser le bouchon légèrement et laisser la vapeur s’échapper avant d’enlever le bouchon. L ’utilisation d’un groupe autonome à l’intérieur PEUT VOUS TUER EN QUELQUES MINUTES. Le s fumées d’un groupe autonome contient du monoxyde de carbone.
OM-4419 Page 10 LE SURCHAUFFEMENT peut endom- mager le moteur électrique. Arrêter ou déconnecter l’équipement avant d e démarrer ou d’a rrêter le moteur . Ne pas laisser tourner le moteur trop lentement sous risque d’en - dommager l e moteur électrique à cause d’une tension et d’une fré - quence trop faibles.
OM-4419 Page 1 1 2-6. P r oposition californienne 65 A vertissements Les équipements de soudage et de coupage produisent des fumées et des gaz qui contiennent des produits chimiques dont l’État de Californie reconnaît qu’ils provoquent des mal- formations congénitales et, dans certains cas, des cancers.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 12 SECTION 3 − DEFINITIONS 3-1. Symbol Definitions Stop Engine Fast (Run, W eld/Power) Fast/Slow (Run/Idle) Slow (Idle) S.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 13 4-2. Dimensions, W eights, and Operating Angles Dimensions Height 33-1/2 in (851 mm) (T o T op Of Exhaust) A B Width 20 in (508 mm) B C ! Depth 45-3/8 in (1 153 mm) D ! Do not exceed tilt angles or engine could be damaged or unit could tip.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 14 4-4. Fuel Consumption (Robin-Powered Units) 220 571 On a typical job using 1/8 in 7018 electrodes (125 amps, 20% duty cycle), expect about 20 hours of op- eration.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 15 4-6. V olt-Ampere Curves 200 296 / 200 297 / 200 298 The volt-ampere curve shows the minimum and maximum voltage an d amperage output capabilities of th e welding generator .
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 16 4-7. Generator Power Curve 200 294 The generator power curve shows the generator power in amperes available at the receptacles. Continuous W elding 4-8. Duty Cycle 200 293 Duty cycle is the percentage of 10 minutes that unit can weld at rated load without overheating.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 17 SECTION 5 − INST ALLA TION install2 12/06 − Ref. 800 652 / Ref. 800 477-A / 803 274-A / 804 712 ! Do not weld on base. Welding on base can cause fuel tank fire or explosion.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 18 5-2. Engine Prestart Checks (Robin-Powered Units) 803 755-C / 217 015-A Full Full Gasoline Check all fluids daily . Engine must be cold and on a level surface. Unit is shipped with 10W30 engine oil.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 19 5-3. Engine Prestart Checks (Kohler-Powered Units) 803 754-C / 217 015-A Check all fluids daily . Engine must be cold and on a level surface. Unit is shipped with 10W30 engine oil.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 20 5-4. Installing Exhaust Pipe 803 751 / Ref. 228 201-B ! Engine backfire can cause se- vere burns or other injuries. Do not point exhaust pipe to- ward control panel. Keep away from exhaust outlet.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 21 ! Stop engine. 1 W ork Weld Output T erminal 2 Electrode W eld Output T erminal Connect work cable to W ork terminal. Connect electrode holder cable or electrode weld cable to Electrode ter- minal for Stick and MIG welding.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 22 5-7. Selecting W eld Cable Sizes* W eld Output T erminals W eld Cable Size** and T otal Cable (Copper) Length in Weld Circuit Not Exceeding*** ! T urn off power before connecting to weld output terminals.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 23 SECTION 6 − OPERA TING THE WELDING GENERA TOR 4 3 6 6-1. Front Panel Controls Ref. 228 201-B 1 Engine Control Switch Use switch to start engine, select speed, and stop engine.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 24 6-2. Cold Weather Engine Operation Ref. 228 201-B 1 Engine Control Switch Carburetor Icing Carburetor icing causes the unit to drop below the normal idle speed and then stall.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 25 ELECTRODE DC* AC POSITION PENETRA TION USAGE MIN. PREP , ROUGH HIGH SP ATTER GENERAL SMOOTH, EASY , F AST LOW HYDROGEN, .
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 26 6-4. T ypical MIG Welding Connections And Settings A. Solid Wire Applications 803 750-B / 802 766 / 228 201-B ! Stop engine. This section provides general guide- lines and may not suit all ap- plications.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 27 B. Self-Shielded Flux Core Wire Applications 803 750-B / 802 766 / 228 201-B ! Stop engine. This section provides general guidelines and may not suit all applications.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 28 6-5. T ypical MIG Connections And Settings Using Weld Control And Spoolgun 802 750-B / 228 201-B This section provides general guide- lines and may not suit all applications.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 29 SECTION 7 − OPERA TING AUXILIAR Y EQUIPMENT 7-1. Generator Power Receptacles 803 750-B / Ref. 228 201-B ! If unit does not have GFCI recep- tacles, use GFCI-protected extension cord.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 30 7-2. Simultaneous W eld And Power W eld Current in Amperes T otal Power in Watts 120 V Full kV A Receptacle Amperes 240 V Full kV A Receptacle Amperes 250 2200 18 9 180 3500 29 14 125 5200 43 21 90 8000 66 33 0 10,500 87 43 7-3.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 31 SECTION 8 − MAINTENANCE (ROBIN-POWERED UNITS) 8-1. Routine Maintenance (Robin-Powered Units) ! Stop engine before maintaining. S ee Engine Manual and Maintenance Label for important start-up, service, and storage information.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 32 8-2. Maintenance Label (Robin-Powered Units).
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 33 8-3. Servicing Air Cleaner (Robin-Powered Units) aircleaner3 1 1/04 − 803 070 / S-0759 ! Stop engine. NOTICE − Do not run engine with- ou t air cleaner or with dirty element.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 34 8-5. Changing Engine Oil, Oil Filter , and Fuel Filter (Robin-Powered Units) 803 755-C / 802 921-A / S-0842 ! Stop engine and let cool. 1 Oil Drain V alve 2 1/2 ID x 7 in Hose 3 Oil Filter Change engine oil and filter accord- ing to engine owner’s manual.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 35 8-6. Adjusting Engine Speed (Robin-Powered Units) 803 755-C / 802 457 After tuning engine, check engine speeds with a tachometer (see table). If necessary , adjust speeds as follows: Start engine and run until warm.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 36 8-7. Servicing Optional Spark Arrestor (Robin-Powered Units) Ref. 801 682-A / Ref. 183 175 − A ! Stop engine and let cool. 1 Spark Arrestor Screen Clean and inspect screen.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 37 SECTION 9 − MAINTENANCE − (KOHLER-POWERED UNITS) 9-1. Routine Maintenance (Kohler-Powered Units) ! Stop engine before maintaining. S ee Engine Manual and Maintenance Label for important start-up, service, and storage information.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 38 9-2. Maintenance Label (Kohler-Powered Units).
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 39 9-3. Servicing Air Cleaner (Kohler − Powered Units) aircleaner3 1 1/04 − 802 772 / S-0759 ! Stop engine. NOTICE − Do not run engine with- ou t air cleaner or with dirty element.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 40 9-4. Changing Engine Oil, Oil Filter , and Fuel Filter (Kohler-Powered Units) 803 754 / S-0842 ! Stop engine and let cool. 1 Oil Drain V alve 2 1/2 ID x 7 in Hose 3 Oil Filter Change engine oil and filter accord- ing to engine owner’s manual.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 41 9-5. Adjusting Engine Speed (Kohler-Powered Units) 803 752 / 801 209-A After tuning engine, check engine speeds with a tachometer (see table). If necessary , adjust speeds as follows: Start engine and run until warm.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 42 9-6. Overload Protection (Kohler-Powered Units) 803 753-B ! Stop engine. Disconnect negative ( − ) battery cable. 1 Fuse F1 (See Section 1 1 -1) F1 protects the weld excitation winding from overload.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 43 SECTION 10 − TROUBLESHOOTING 10-1. W elding T roubleshooting T rouble Remedy Low or no weld output; generator pow- er output okay at ac receptacles. Check control settings.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 44 T rouble Remedy Low power output at ac receptacles. Check fuse F2, and replace if open (see Section 8-4 or 9- 6 ) . Increase Fine control R1 setting to max. High power output at ac receptacles.
A complete Parts List is available at www .MillerW elds.com OM-4419 Page 45 T rouble Remedy Unstable or sluggish engine speeds. Readjust throttle linkage if necessary . Check throttle solenoid TS1 for smooth operation. Check oil level. Oil level should not exceed Full mark on dipstick.
OM-4419 Page 46 SECTION 12 − ELECTRICAL DIAGRAMS Figure 12-1. Circuit Diagram For Welding Generator.
OM-4419 Page 47 228 460-A.
OM-4419 Page 48 SECTION 13 − GENERA TOR POWER GUIDELINES The views in this section are intended to be representative of all engine-driven welding generators. Y our unit may differ from those shown. 13-1. Selecting Equipment gen_pwr 2007 − 04 − Ref.
OM-4419 Page 49 13-3. Grounding When Supplying Building Systems ST-800 576-B 1 Equipment Grounding T erminal 2 Grounding Cable Use #10 AWG or larger insulated copper wire. 3 Ground Device Us e ground device as stated in electrical codes. ! Ground generator to system earth ground if supplying power to a premises (home, shop, farm) wiring system.
OM-4419 Page 50 13-5. Approximate Power Requirements For Industrial Motors Industrial Motors Rating Sta rting W atts Running W atts Split Phase 1/8 HP 800 300 1/6 HP 1225 500 1/4 HP 1600 600 1/3 HP 21.
OM-4419 Page 51 13-7. Approximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running W atts Hand Drill 1/4 in 350 350 3/8 in 400 400 1/2 in 600 600 Circular Saw 6-1/2.
OM-4419 Page 52 13-8. Power Required T o Start Motor Single-Phase Induction Motor Starting Requirements Motor Start Code G H J K L M N P KV A/HP 6.3 7.1 8.0 9.0 10.0 1 1.2 12.5 14.0 S-0624 1 Motor Start Code 2 Running Amperage 3 Motor HP 4 Motor V oltage T o find starting amperage: Step 1: Find code and use table to find kV A/HP .
OM-4419 Page 53 13-10. T ypical Connections T o Supply Standby Power T ransfer Switch Essential Loads Fused Disconnect Switch (If Required) Utility Electrical Service 12 3 4 5 W elding Generator Output ! Have only qualified persons perform these connections according to all applicable codes and safety practices.
OM-4419 Page 54 13-1 1. Selecting Extension Cord (Use Shortest Cord Possible) Cord Lengths for 120 V olt Loads If unit does not have GFCI receptacles, use GFCI-protected extension cord.
OM-4419 Page 55 SECTION 14 − STICK WELDING (SMA W) GUIDELINES 14-1. Stick Welding Procedure stick 2007 − 04 − ST -151 593 ! Weld current starts when electrode touches work- piece. ! Weld current can damage electronic parts in vehicles. Disconnect both battery cables before welding on a vehicle.
OM-4419 Page 56 14-2. Electrode and Amperage Selection Chart Ref. S-087 985-A 3/32 1/8 5/32 3/16 7/32 1/4 1/16 5/64 3/32 1/8 5/32 3/16 7/32 1/4 3/32 1/8 5/32 3/16 7/32 1/4 3/32 1/8 5/32 3/16 7/32 1/4 .
OM-4419 Page 57 14-5. Positioning Electrode Holder S-0060 90 ° 90 ° 10 ° -30 ° 45 ° 45 ° GROOVE WELDS FILLET WELDS End View of Work Angle Side V iew of Electrode Angle End View of Work Angle Side View of Electrode Angle 10 ° -30 ° 14-6.
OM-4419 Page 58 14-8. Conditions That Affect Weld Bead Shape Weld bead shape is affected by electrode angle, arc length, travel speed, and thickness of base metal. S-0061 ELECTRODE ANGLE ARC LENGTH TRA VEL SPEED Slow Normal Fast 10 ° - 30 ° Drag T oo Short Normal T oo Long Spatter Angle T oo Small Angle T oo Large Correct Angle 14-9.
OM-4419 Page 59 14-10. Butt Joints S-0662 1 T ack Welds Prevent edges of joint from draw- ing together ahead of electrode by tack welding the materials in posi- tion before final weld. 2 Square Groove Weld Good for materials up to 3/16 in (5 mm) thick.
OM-4419 Page 60 14-13. W eld T est S-0057-B 1 Vise 2 Weld Joint 3 Hammer Strike weld joint in direction shown. A good weld bends over but does not break. 2 T o 3 in 1/4 in 3 2 1 2 T o 3 in 3 2 1 (51-76 mm) (6.4 mm) (51-76 mm) 14-14. T roubleshooting − Porosity Porosity − small cavities or holes resulting from gas pockets in weld metal.
OM-4419 Page 61 14-16. T roubleshooting − Incomplete Fusion Incomplete Fusion − failure of weld metal to fuse completely with base metal or a preceeding weld bead. Possible Causes Corrective Actions Insufficient heat input. Increase amperage. Select larger electrode and increase amperage.
OM-4419 Page 62 14-19. T roubleshooting − Burn-Through Burn-Through − weld metal melting completely through base metal resulting in holes where no metal remains. Possible Causes Corrective Actions Excessive heat input. Select lower amperage. Use smaller electrode.
OM-4419 Page 63 SECTION 15 − MIG WELDING (GMA W) GUIDELINES 15-1. T ypical MIG Process Connections Using A V oltage-Sensing Wire Feeder ! W eld current can damage electronic parts in vehicles. Disconnect both battery cables before welding on a vehicle.
OM-4419 Page 64 15-3. Conditions That Affect W eld Bead Shape Weld bead shape depends on gun angle, direction of travel, electrode extension (stickout), travel speed, thickness of base metal, wire feed speed (weld current), and voltage.
OM-4419 Page 65 15-4. Gun Movement During Welding Normally , a single stringer bead is satisfactory for most narrow groove weld joints; however , for wide groove weld joints or bridging acros s gaps, a weave bead or multiple stringer beads works better .
OM-4419 Page 66 15-7. T roubleshooting − Excessive Spatter Excessive Spatter − scattering of molten metal particles that cool to solid form near weld bead. S-0636 Possible Causes Corrective Actions Wire feed speed too high. Select lower wire feed speed.
OM-4419 Page 67 15-10. T roubleshooting − Lack Of Penetration Lack Of Penetration − shallow fusion between weld metal and base metal. Lack of Penetration Good Penetration S-0638 Possible Causes Corrective Actions Improper joint preparation. Material too thick.
OM-4419 Page 68 15-13. T roubleshooting − W aviness Of Bead W aviness O f Bead − weld metal that is not parallel and does not cover joint formed by base metal. S-0641 Possible Causes Corrective Actions W elding wire extends too far out of nozzle. Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.
OM-4419 Page 69 15-15. Common MIG Shielding Gases This is a general chart for common gases and where they are used. Many different combinations (mixtures) of shielding gases have been developed over the years. The most commonly used shielding gases are listed in the following table.
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Warranty Questions? Call 1-800-4-A-MILLER for your local Miller distributor. miller_warr 2007 − 01 Y our distributor also gives you ... Service Y ou always get the fast, reliable response you need. Most replacement parts can be in your hands in 24 hours.
PRINTED IN USA © 2007 Miller Electric Mfg. Co. 2007 − 01 Miller Elect ric Mfg. Co. An Illinois T ool Wo rks Comp any 1635 West S pencer S treet Applet on, WI 5 4914 US A International He adquarters.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Miller Electric Bobcat 250 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Miller Electric Bobcat 250 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Miller Electric Bobcat 250 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Miller Electric Bobcat 250 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Miller Electric Bobcat 250, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Miller Electric Bobcat 250.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Miller Electric Bobcat 250. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Miller Electric Bobcat 250 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
