Miller Electric Big Blue 251D Description Of Front Panel Controls See Section, Remote A/V Control

Page 23

6-2. Description Of Front Panel Controls (See Section 6-1)

. This unit has a max OCV control circuit

 

(See Section 6-3)

 

that resets the Amperage/Voltage Con-

6 Magnetic Shutdown Switch (Optional)

 

trol to maximum when the arc breaks.

Use switch during start-up to bypass optional

 

When an arc is struck, weld output control

engine shutdown system. System stops en-

 

returns to the front panel or remote con-

gine if oil pressure is too low or oil temperature

 

trol setting. The Amperage/voltage Con-

is too high.

 

trol adjusts amperage only when welding

7

Engine Control Switch

 

and does not adjust open-circuit voltage.

To Start: turn switch to Start while pressing

1

Ampere Range Switch

Shutdown switch. Release switches when

Use switch to select weld amperage range.

engine starts.

For most welding applications, use lowest

. If the engine does not start, let engine

amperage range possible to prevent arc out-

ages.

 

come to a complete stop before attempt-

Y Do not switch under load.

 

ing restart.

Light goes on if oil pressure is too low. If unit has automatic shutdown option, light also goes on if oil temperature is too high.

YStop engine and fix trouble if either light goes on.

10 Ether Starting Aid Switch (Optional)

Push switch up and release while cranking engine to release ether.

YDo not use Ether if engine is running.

11 Engine Hour Meter

12 Oil Temperature Gauge/Switch

(Optional)

2 Amperage/Voltage Control

Control adjusts amperage within range selected by Ampere Range switch. Weld out- put would be 148 A DC with controls set as shown (50% of 95 to 200 A).

3DC Voltmeter (Optional)

4DC Ammeter (Optional)

5Remote A/V Switch And Receptacle

In Run position, engine runs at weld/power speed. In Run/Idle position (optional), engine runs at idle speed at no load and weld/power speed with load applied.

To Stop: turn switch to Off position.

8 Battery Charging Warning Light

Light goes on when battery is not charging.

9 Oil Pressure Warning Light

13

Oil Pressure Gauge/Switch (Optional)

14

Polarity Switch (Optional)

Place switch in Straight position for electrode negative, or Reverse position for electrode positive.

15 Manual Shutoff Lever

Use lever to stop engine if engine control switch does not work.

6-3. Remote A/V Control

1 A/V Control Switch

Use switch to select front panel or remote amperage control.

2 Remote A/V Receptacle RC3 Connect optional remote control to

1

2

RC3.

 

 

 

Example: Combination Remote Amperage Control

In Example:

Range = 95 to 200 A

Percentage Of Range = 50%

Max = 148 A DC (50% of 95 to 200)

 

 

 

Max (148 A DC)

 

 

 

Min (70 A DC)

Set Switch

Set Range

Set Percentage

Adjust Optional Remote Control

 

 

 

S-0774

OM-480 Page 19

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Contents Engine Driven Welding Generator ProcessesDescription Visit our website at OM-480128 576AC JanuaryFrom Miller to You Table of Contents Options and Accessories Warranty Arc Welding Hazards Symbol UsageEngine Hazards Compressed Air Hazards Radiation can cause interference Principal Safety StandardsCalifornia Proposition 65 Warnings EMF InformationLES Fumées ET LES GAZ peuvent être dangereux Signification des symboles− Consignes DE Sécurité − Lire Avant Utilisation UN Choc Électrique peut tuerLE Bruit peut affecter l’ouïe LE Soudage peut provoquer un in- cendie ou une explosionDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures graves’AIR Comprimé peut provoquer des blessures ’EXPLOSION DE LA Batterie peutDES Organes Mobiles peuvent provoquer des blessures LA Chaleur DU Moteur peut pro- voquer un incendieInformation sur les champs électromagnétiques Principales normes de sécurité− Definitions Symbols And DefinitionsDimensions, Weights, And Operating Angles − SpecificationsWeld, Power, And Engine Specifications Duty Cycle And Overheating Curve shows typical fuel use under weld or power loadsExceeding duty cycle can damage unit and void warranty Fuel ConsumptionVolt-Ampere Curves AC Generator PowerOptional AC Power Plant Curves Connecting The Battery − InstallationInstalling Welding Generator Fuel Do not use gasoline. Gasoline Installing Muffler PipeEngine Prestart Checks Stop engine and let coolConnecting To Weld Output Terminals Installing Ether Cylinder Optional Ether Starting AidPut terminals Selecting Weld Cable Sizes150 ft 200 ft 250 ft 350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 mControls See Section − Operating the Welding GeneratorDo not use Ether if engine is running Description Of Front Panel Controls See SectionRemote A/V Control Stop engine and fix trouble if either light goes onX 15 a + 120 V x 10 a = 3.0 kVA/kW OM-480 − Operating Auxiliary EquipmentVolt Duplex And Optional Gfci Receptacles X 10 a + 120 V x 5 a = 3.0 kVA/kW Volt Duplex Receptacle Optional240 V 15 a AC Receptacle RC1 Circuit Breakers CB1 And CB2Connecting Optional AC Power Plant 240 Volt Twistlock Receptacle Optional − Maintenance and Troubleshooting Maintenance Label Servicing Air Cleaner To replace secondary fuel filter Servicing Fuel And Lubrication SystemsTo change oil and filter To replace primary fuel filterModels With Automatic Idle Optional Adjusting Engine SpeedStandard Models Full Empty Overload Protection Servicing Optional Ether Starting AidWelding Inspecting And Cleaning Optional Spark ArrestorTroubleshooting Stop engine and let cool. Reinstall cleanout plugMaximum see Section Generator PowerCheck connections to ac power plant see Section EngineCircuit Diagram For Welding Generator − Electrical DiagramWelding Generator − RUN-IN ProcedureWetstacking From flammables Do not Perform Run-In Procedure Using Load BankProcedure at less than Stop engine Do not touch hot exhaustDo not perform run-in Run-In Procedure Using Resistance GridBank/grid From flammablesGrounding Generator To Truck Or Trailer Frame − Generator Power GuidelinesSelecting Equipment 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 1000 = Starting Amperage Power Required To Start MotorHow Much Power Can Generator Supply? Single-Phase Induction Motor Starting RequirementsWork like a Pro Typical Connections To Supply Standby PowerCurrent Load Watts Amperes Selecting Extension Cord Use Shortest Cord PossibleOM-480 116 − Parts List125 124 123 122 120 121 1172526 126 Dia Part Description Quantity Mkgs 128 111 Panel, Front w/Components -1ItemPanel, Front w/Components -1Item 111 Cont’d Generator Generator -1Item Includes 114Page Page Support ServiceYour distributor also gives Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. Co For assistance in filing or settling claims, contact
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