Miller-electric 251 NT User Manual

ProcessesDescriptionTIG (GTAW) WeldingStick (SMAW) WeldingMIG (GMAW) WeldingFlux Cored (FCAW)Engine Driven Welding GeneratorOM-486 187 236HFebruary 20

OM-486 Page 6Le soudage effectué sur des conteneurs fermés tels quedes réservoirs, tambours ou des conduites peut provoquerleur éclatement. Des étince

OM-486 Page 7DES ORGANES MOBILES peuventprovoquer des blessures. Ne pas approcher les mains des ventilateurs, cour-roies et autres pièces en mouvemen

OM-486 Page 8LE RAYONNEMENT HAUTE FRÉ-QUENCE (H.F.) risque de provoquerdes interférences. Le rayonnement haute fréquence (H.F.) peutprovoquer des int

OM-486 Page 9SECTION 2 – DEFINITIONS2-1. Symbol DefinitionsStop EngineFast(Run, Weld/Power)Fast/Slow(Run/Idle)Slow (Idle)Start Engine Panel/Local Temp

OM-486 Page 103-2. Dimensions, Weights, and Operating AnglesDimensionsAHeight 33 in (838 mm)BCWidth 18-3/4 in (476 mm)CDepth 45-1/2 in (1156 mm)D Do

OM-486 Page 11ST-189 268The ac auxiliary power curveshows the auxiliary power availablein amperes at the receptacles.3-4. Auxiliary Power Curve020 40

OM-486 Page 12ST-189 266 / ST-189 267 / ST-189 265The volt-ampere curves show theminimum and maximum voltageand amperage output capabilities ofthe wel

OM-486 Page 13SECTION 4 – INSTALLATIONinstall1 12/99 – Ref. ST-800 652 / Ref. ST-800 477-A / ST-158 936-A / S-0854 Do not weld on base. Weld-ing on b

OM-486 Page 144-3. Activating The Dry Charge Battery (If Applicable)Remove battery from unit.1 Eye Protection – SafetyGlasses Or Face Shield2 Rubber G

OM-486 Page 154-4. Connecting The BatteryRef. ST-800 394-C / Ref. ST-189 925-A / Ref. S-0756-D+–3/8, 1/2 in Connect negative (–)cable last.Tools Need

Miller Electric manufactures a full lineof welders and welding related equipment.For information on other quality Millerproducts, contact your local M

OM-486 Page 164-7. Selecting Weld Cable SizesTotal Cable (Copper) Length In Weld Circuit Not ExceedingWeldingAmperes100 ft (30 m) Or Less150 ft(45 m)2

OM-486 Page 174-9. Adjusting MIG Weld Puddle ConsistencyST-801 944-C / Ref. ST-189 925-A Stop engine.Stabilizer DC-Z is factoryconnected to suit most

OM-486 Page 18SECTION 5 – OPERATING WELDING GENERATOR5-1. Front Panel ControlsRef. ST-189 925-A1 DC Polarity/AC Switch Do not switch under load.Use s

OM-486 Page 195-2. Remote Amperage/Voltage Control1 Remote 14 Receptacle RC1Connect optional remote control toRC1 (see Section 4-8).2 Remote Hand Cont

OM-486 Page 20SECTION 6 – OPERATING AUXILIARY EQUIPMENT6-1. Auxiliary Power Receptacles And Circuit BreakersRef. ST-189 925-A14253 If unit does not h

OM-486 Page 216-2. Optional Auxiliary Power Receptacles If unit does not have GFCI re-ceptacles, use GFCI-protected extension cord. Auxiliary power

OM-486 Page 22SECTION 7 – MAINTENANCE AND TROUBLESHOOTING7-1. Routine MaintenanceRecycleenginefluids. Stop engine before maintaining. See Engine Man

OM-486 Page 237-2. Maintenance LabelFollow the storage procedure in the engine owner’s manual if the unit will not beused for an extended period.NOTE

OM-486 Page 247-3. Servicing Air Cleaner aircleaner3 1/97 – ST-156 852 / Ref. ST-185 095-A / S-0759 Stop engine. Do not run engine without aircleane

OM-486 Page 257-5. Changing Engine Oil, Oil Filter, And Fuel FilterRef. ST-801 942-C / ST-800 395-B / Ref. ST-189 925-A / S-0842 Stop engine and let

The following terms areused interchangeablythroughout this manual:MIG = GMAW, Wire WeldingTIG = GTAWStick = SMAWThe engine exhaust fromthis product co

OM-486 Page 267-6. Adjusting Engine SpeedRef. ST-801 942-C / ST-800 397-AAfter tuning engine, check enginespeeds with a tachometer (seetable). If nece

OM-486 Page 27 Stop engine. When a circuit breaker or fuseopens, it usually indicates amore serious problem exists.Contact a Factory AuthorizedServi

OM-486 Page 28Trouble RemedyLow weld output. Check control settings.Place Remote Amperage/Voltage switch in Panel position, or move switch to Remote 1

OM-486 Page 29B. Auxiliary PowerTrouble RemedyNo power output. Reset circuit breakers CB1, CB2, CB3 and/or CB4 (see Section 6-1).Check fuse F1, and re

OM-486 Page 30SECTION 8 – ELECTRICAL DIAGRAMFigure 8-1. Circuit Diagram For Welding Generator

OM-486 Page 31ST-190 578-B

OM-486 Page 32SECTION 9 – AUXILIARY POWER GUIDELINES9-1. Selecting Equipmentaux_pwr 2/99 – Ref. ST-159 730 / ST-800 5771 Auxiliary Power Receptacles–

OM-486 Page 339-3. Grounding When Supplying Building SystemsST-800 576-B1 Equipment GroundingTerminal2 Grounding CableUse #10 AWG or larger insulatedc

OM-486 Page 349-5. Approximate Power Requirements For Industrial MotorsIndustrial Motors Rating Starting Watts Running WattsSplit Phase 1/8 HP 800 300

OM-486 Page 359-7. Approximate Power Requirements For Contractor EquipmentContractor Rating Starting Watts Running WattsHand Drill 1/4 in 350 3503/8 i

OM-486 Page 369-8. Power Required To Start MotorS-06241 Motor Start Code2 Running Amperage3 Motor HP4 Motor VoltageTo find starting amperage:Step 1: F

OM-486 Page 379-10. Typical Connections To Supply Standby PowerS-0405-A1 Power Company ServiceMeter2 Main and Branch OvercurrentProtection3 Double-Pol

OM-486 Page 389-11. Selecting Extension Cord (Use Shortest Cord Possible)Cord Lengths for 120 Volt Loads If unit does not have GFCI receptacles, use

OM-486 Page 39SECTION 10 – PARTS LISTST-802 048-D Hardware is common andnot available unless listed.123456789111213141516171819102021222324–Fig 10–32

OM-486 Page 40DescriptionPartNo.Dia.Mkgs.ItemNo.Figure 10-1. Main AssemblyQuantity1 182 367 PANEL, right side 1. . . . . . . . . . . . . . . . . .

OM-486 Page 41DescriptionPartNo.Dia.Mkgs.ItemNo.Figure 10-1. Main Assembly (Continued)QuantityRC1 174 824 CONNECTOR & PINS 1. . . . . . . . . . .

OM-486 Page 42DescriptionPartNo.Dia.Mkgs.ItemNo.Figure 10-2. Panel, Front w/Components (Fig 10-1 Item 54)Quantity1 187 593 PANEL, front 1. . . . . .

OM-486 Page 43DescriptionPartNo.ItemNo.Figure 10-3. Generator (Fig 10-1 Item 24)Quantity1 +186 238 STATOR 1. . . . . . . . . . . . . . . . . . . .

OM-486 Page 1SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USINGrom _nd_11/981-1. Symbol UsageMeans Warning! Watch Out! There are possible hazardswith

Warranty Questions?Call1-800-4-A-MILLERfor your localMiller distributor.miller_warr 7/00Your distributor also givesyou ...ServiceYou always get the fa

PRINTED IN USA  2000 Miller Electric Mfg. Co. 6/00Miller Electric Mfg. Co.An Illinois Tool Works Company1635 West Spencer StreetAppleton, WI 54914 US

OM-486 Page 2Welding on closed containers, such as tanks,drums, or pipes, can cause them to blow up. Sparkscan fly off from the welding arc. The flyin

OM-486 Page 3MOVING PARTS can cause injury. Keep away from fans, belts, and rotors. Keep all doors, panels, covers, and guardsclosed and securely in

OM-486 Page 4H.F. RADIATION can cause interference. High-frequency (H.F.) can interfere with radionavigation, safety services, computers, andcommunic

OM-486 Page 5SECTION 1 – CONSIGNES DE SÉCURITÉ – LIRE AVANTUTILISATIONrom _nd_fre 11/981-1. Signification des symbolesSignifie Mise en garde ! Soyez