Hobart Welding Products 3025 Power Required To Start Motor, How Much Power Can Generator Supply?

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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-492 Page 47

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Contents OM-492 ProcessesDescription From Hobart to You Table of Contents Page ARC Rays can burn eyes and skin Symbol UsageArc Welding Hazards Electric Shock can killEngine Hazards Engine Heat can cause fire Battery Explosion can BlindMoving Parts can cause injury Engine Exhaust Gases can killARC Welding can cause interference Principal Safety StandardsEMF Information Radiation can cause interferenceLES Fumé ES ET LES GAZ peuvent ê tre dangereux Signification des symbolesConsignes DE SÉ Curité Lire Avant Utilisation UN Choc É Lectrique peut tuerLE Bruit peut affecter l’ouïe LE Soudage peut provoquer un in- cendie ou une explosionDES Particules Volantes peuvent blesser les yeux DES PIÈ CES Chaudes peuvent provoquer des brû lures gravesLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessures’EXPLOSION DE LA Batterie peut LA Chaleur DU Moteur peut pro- voquer un incendieConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques LE Soudage À L’ARC risque de provoquer des interfé rencesDefinitions SpecificationsSymbol Definitions Weld, Power, And Engine SpecificationsOverheating Dimensions, Weights, and Operating AnglesDimensions Duty Cycle And OverheatingCC Mode CV ModeVolt-Ampere Curves Movement Airflow Clearance Do not lift unit from end InstallationInstalling Welding Generator Fuel ConsumptionFuel Do not use gasoline. Gasoline will damage engine Keep radiator and air intake clean and free of dirtEngine Prestart Checks Full 13 mm DieselAdding Coolant To Radiator Connecting The BatteryConnecting To Weld Output Terminals Installing Exhaust Pipe10 100% Duty Cycle Selecting Weld Cable SizesRemote 14 Receptacle RC5 Information 100 ft 30 m Or LessOM-492 Controls See Section Operating Welding GeneratorDescription Of Controls See Section Meter Functions Mode Switch SettingsMode Meter Reading At Idle Meter Reading While Welding Mode Switch Setting Process Output On/Off ControlTouch Seconds Do not Strike Like a Match Lift-Arc TIG ProcedureWeld Total 120 Auxiliary Power Receptacles And Circuit BreakersThree-Phase 240 Operating Auxiliary Equipment120V Plug Wired for 240 V, 2-Wire Load Load. See circuit diagramPlug Wired for 120/240 Wire LoadMaintenance and Troubleshooting 2000 h 500 h800 h 1000 hMaintenance Label Servicing Optional Spark Arrestor Servicing Air CleanerTo Clean air filter Do not clean housing with air hoseServicing Engine Lubrication And Fuel Systems Servicing Engine Cooling System Weld Speed Jam Nut Adjustment Screw Adjusting Engine SpeedAdjusting Idle Speed Adjusting Weld/Power SpeedOverload Protection Voltmeter/Ammeter Help Displays Troubleshooting WeldingTrouble Remedy Auxiliary Power No power output Reset circuit breakers see SectionNecessary parts Engine CT1 Reset circuit breaker CB9 see SectionOM-492 Circuit Diagram For Welding Generator Electrical Diagrams200 Wetstacking RUN-IN ProcedureRun-In Procedure Using Load Bank Load BankWelding Generator Weld Cables From flammables Run-In Procedure Using Resistance GridDo not touch hot exhaust Bank/gridAuxiliary Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame Amperes x Volts = Watts Grounding When Supplying Building SystemsHow Much Power Does Equipment Require? Earth ground if supplyingFarm/Home Equipment Rating Starting Watts Running Watts Approximate Power Requirements For Industrial MotorsApproximate Power Requirements For Farm/Home Equipment Industrial Motors Rating Starting Watts Running WattsContractor Rating Starting Watts Running Watts Approximate Power Requirements For Contractor EquipmentKVA/HP x HP x Power Required To Start MotorHow Much Power Can Generator Supply? Single-Phase Induction Motor Starting RequirementsTypical Connections To Supply Standby Power Current Load Watts Amperes Selecting Extension Cord Use Shortest Cord Possible109 108 107 106 Parts List112 104 103 102 101 100 1054746 8988 Item Dia Part Mkgs Description Quantity PLG11 Front Panel Front Panel -5, Item Inverter Assembly Inverter Assembly -5, Item Generator Support ServiceContact your Distributor for Hobart Welding ProductsCall