Miller Electric Big 40 WG Power Required To Start Motor, How Much Power Can Generator Supply?

Page 60

10-8. Power Required To Start Motor

4

 

 

AC MOTOR

 

2

1

 

 

 

 

VOLTS

230

AMPS

2.5

 

 

 

 

 

3

 

CODE

M

Hz

60

 

 

 

HP

1/4

PHASE 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Single-Phase Induction Motor Starting Requirements

Motor Start

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Code

G

 

H

 

J

K

L

M

 

N

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KVA/HP

6.3

 

7.1

8.0

9.0

10.0

11.2

 

12.5

 

14.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

kVA/HP x HP x 1000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

= STARTING AMPERAGE

 

 

 

 

 

 

 

VOLTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXAMPLE: Calculate the starting amperage required for a 230 V, 1/4

 

 

HP motor with a motor start code of M.

 

 

 

 

 

 

 

Volts = 230

HP = 1/4 Using Table, Code M results in kVA/HP = 11.2

11.2 x 1/4 x 1000

= 12.2 A

Starting the motor requires 12.2 amperes.

 

230

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1Motor Start Code

2Running Amperage

3Motor HP

4Motor Voltage

To find starting amperage:

Step 1: Find code and use table to find kVA/HP. If code is not listed, multiply running amperage by six to find starting amperage.

Step 2: Find Motor HP and Volts.

Step 3: Determine starting amper- age (see example).

Welding generator amperage out- put must be at least twice the motor’s running amperage.

S-0624

10-9. How Much Power Can Generator Supply?

1

2

1Limit Load To 90% Of Generator Output

Always start non-resistive (motor) loads in order from largest to small- est, and add resistive loads last.

2 5 Second Rule

If motor does not start within 5 seconds, turn off power to prevent motor damage. Motor requires more power than generator can supply.

Ref. ST-800 396-A / S-0625

OM-4405 Page 56

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Contents OM-4405 ProcessesDescription From Miller to You Table of Contents Options and Accessories Warranty Symbol Usage Arc Welding HazardsElectric Shock can kill ARC Rays can burn eyes and skinEngine Hazards Battery Explosion can Blind Moving Parts can cause injuryEngine Exhaust Gases can kill Engine Heat can cause firePrincipal Safety Standards EMF InformationRadiation can cause interference ARC Welding can cause interferenceSignification des symboles Consignes DE SÉ Curité Lire Avant UtilisationUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxLE Soudage peut provoquer un in- cendie ou une explosion DES Particules Volantes peuvent blesser les yeuxDES PIÈ CES Chaudes peuvent provoquer des brû lures graves LE Bruit peut affecter l’ouïeDES Organes Mobiles peuvent provoquer des blessures ’EXPLOSION DE LA Batterie peutLA Chaleur DU Moteur peut pro- voquer un incendie LA Chute DE L’APPAREIL peut blesserPrincipales normes de sé curité Information sur les champs é lectromagné tiquesLE Soudage À L’ARC risque de provoquer des interfé rences Consignes relatives aux stimulateurs cardiaquesSpecifications Symbols And DefinitionsWeld, Power, And Engine Specifications DefinitionsDimensions, Weights, And Operating Angles Volt-Ampere Curves For CC ModelsStick Mode MIG ModeTIG Mode Volt-Ampere Curves for CC/CV ModelsFuel Consumption Duty Cycle And OverheatingAC Auxiliary Power Curve Optional AC Power Plant Curves12 kVA/kW Single-Phase Auxiliary Power Plant No Weld Load 15 kVA/kW Three-Phase Auxiliary Power Plant No Weld LoadInstallation Installing Welding Generator See Sections 4-2Using Lifting Eye Installing Exhaust Pipe Mounting Welding GeneratorWelding Unit In Place Bolting Unit In Place To Bolt Unit In PlaceActivating The Dry Charge Battery If Applicable Do not overfill battery cellsRead and follow all instruc ChargerConnecting The Battery Connect Negative Cable LastCoolant Recovery Tank Engine Prestart ChecksFuel OilConnecting To Weld Output Terminals Selecting Weld Cable SizesRef 862-A / 048 720-K / 802 Connecting To Remote 14 Receptacle RC14 On CC/CV Models Socket InformationOperating Welding Generator CC Models Front Panel Controls For CC Models See SectionEngine Indicator Lights Do not switch under loadEngine Starting Controls To StartRemote Amperage Control On CC Models Optional OM-4405 Operating Welding Generator CC/CV Models Front Panel Controls For CC/CV Models See SectionUse switch to select weld amperage range Voltage/Amperage Adjust Switch And Remote 14 ReceptacleProcess/Contactor Switch On CC/CV Models Process/Contactor Switch SettingsProcess/Contactor Switch RunningRemote Voltage/Amperage Control On CC/CV Models Optional Set Remote Set RangeProcess Set RemoteOperating Auxiliary Equipment Volt And 240 Volt ReceptaclesSingle-Phase Power Connection Single-Phase Auxiliary Power Three-Phase Power ConnectionRear Of Panel Optional Auxiliary Power Receptacles 240 V 15 a AC South African Receptacle RC1Circuit Breaker CB2 Circuit Breaker CB3 Maintenance & Troubleshooting Maintenance LabelRoutine Maintenance 50 h100 h 250 hInspecting And Cleaning Optional Spark Arrestor Muffler 500 h1000 h Stop engine and let coolServicing Air Cleaner Adjusting Engine Weld/Power Speed MaximumAdjusting Engine Idle Speed Engine SpeedNo Load Adjusting Governor Sensitivity Tools Needed 1/2Servicing Fuel And Lubrication Systems Press button to reset breaker Overload ProtectionDiagnosing Causes Of Engine Fault Shutdowns Diagnostic Checks While RunningFault Condition 20s Start Engine With No Load AppliedTroubleshooting Welding CC ModelsRepair or replace wire feeder Welding CC/CV ModelsTacle see Section Standard Auxiliary Power Optional Auxiliary Power PlantEngine Wiring harness and components Shutdown switch is released OutAnt temperature is too high see Sections 4-7 Or coolant temperature is too high see Sections 4-7OM-4405 Electrical Diagrams Circuit Diagram For CC Welding Generator201 991-A Circuit Diagram For CC/CV Welding Generator 201 992-A Auxiliary Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame Grounding When Supplying Building Systems How Much Power Does Equipment Require?Earth ground if supplying Amperes x Volts = WattsApproximate Power Requirements For Industrial Motors Approximate Power Requirements For Farm/Home EquipmentIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running WattsApproximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running WattsPower Required To Start Motor How Much Power Can Generator Supply?Single-Phase Induction Motor Starting Requirements KVA/HP x HP xTypical Connections To Supply Standby Power Selecting Extension Cord Use Shortest Cord Possible Current Load Watts AmperesOM-4405 Parts List 107 106 101 105 103CC only 104 -4 or 108 See FIGDia Part Description Dia Part Description Mkgs Quantity Control Box Assembly CC Models Control Box Assembly CC Models -1 Item Control Box Assembly CC/CV Models 177 CONN, body 5 terminal to engine control switch S1 193 Panel, Front w/Components CC Models MS1 Panel, Front w/Components CC/CV Models Panel, Front w/Components CC/CV Models -1 ItemPC6 192 Generator Generator -1 Item Main Rectifier Assembly Service Your distributor also givesSupport Owner’s Record Miller Electric Mfg. Co

Big 40 WG specifications

The Miller Electric Big 40 WG is a versatile and powerful welding generator designed to meet the demands of professionals in the field. Known for its reliability and robust performance, the Big 40 WG is the ideal choice for those who require both welding capabilities and a portable power source.

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