Miller Electric
Big Blue 251D
manual
OM-480
Troubleshooting
Specifications
Install
Parts list
Electrical Diagram
Symbol Usage
Maintenance
RUN-IN Procedure
Adjusting Engine Speed
Servicing Air Cleaner
Page 47
Notes
OM-480
Page 43
Page 46
Page 48
Image 47
Page 46
Page 48
Contents
Engine Driven Welding Generator
Processes
Description
Visit our website at OM-480128 576AC January
From Miller to You
Table of Contents
Options and Accessories Warranty
Arc Welding Hazards
Symbol Usage
Engine Hazards
Compressed Air Hazards
Radiation can cause interference
Principal Safety Standards
California Proposition 65 Warnings
EMF Information
LES Fumées ET LES GAZ peuvent être dangereux
Signification des symboles
− Consignes DE Sécurité − Lire Avant Utilisation
UN Choc Électrique peut tuer
LE Bruit peut affecter l’ouïe
LE Soudage peut provoquer un in- cendie ou une explosion
DES Particules Volantes peuvent blesser les yeux
DES Pièces Chaudes peuvent provoquer des brûlures graves
’AIR Comprimé peut provoquer des blessures
’EXPLOSION DE LA Batterie peut
DES Organes Mobiles peuvent provoquer des blessures
LA Chaleur DU Moteur peut pro- voquer un incendie
Information sur les champs électromagnétiques
Principales normes de sécurité
− Definitions
Symbols And Definitions
Dimensions, Weights, And Operating Angles
− Specifications
Weld, Power, And Engine Specifications
Duty Cycle And Overheating
Curve shows typical fuel use under weld or power loads
Exceeding duty cycle can damage unit and void warranty
Fuel Consumption
Volt-Ampere Curves
AC Generator Power
Optional AC Power Plant Curves
Connecting The Battery
− Installation
Installing Welding Generator
Fuel Do not use gasoline. Gasoline
Installing Muffler Pipe
Engine Prestart Checks
Stop engine and let cool
Connecting To Weld Output Terminals
Installing Ether Cylinder Optional Ether Starting Aid
Put terminals
Selecting Weld Cable Sizes
150 ft 200 ft 250 ft
350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m
Controls See Section
− Operating the Welding Generator
Do not use Ether if engine is running
Description Of Front Panel Controls See Section
Remote A/V Control
Stop engine and fix trouble if either light goes on
X 15 a + 120 V x 10 a = 3.0 kVA/kW OM-480
− Operating Auxiliary Equipment
Volt Duplex And Optional Gfci Receptacles
X 10 a + 120 V x 5 a = 3.0 kVA/kW
Volt Duplex Receptacle Optional
240 V 15 a AC Receptacle RC1
Circuit Breakers CB1 And CB2
Connecting 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 Systems
To change oil and filter
To replace primary fuel filter
Models With Automatic Idle Optional
Adjusting Engine Speed
Standard Models
Full Empty
Overload Protection Servicing Optional Ether Starting Aid
Welding
Inspecting And Cleaning Optional Spark Arrestor
Troubleshooting
Stop engine and let cool. Reinstall cleanout plug
Maximum see Section
Generator Power
Check connections to ac power plant see Section
Engine
Circuit Diagram For Welding Generator
− Electrical Diagram
Welding Generator
− RUN-IN Procedure
Wetstacking
From flammables Do not Perform
Run-In Procedure Using Load Bank
Procedure at less than
Stop engine Do not touch hot exhaust
Do not perform run-in
Run-In Procedure Using Resistance Grid
Bank/grid
From flammables
Grounding Generator To Truck Or Trailer Frame
− Generator Power Guidelines
Selecting Equipment
Amperes x Volts = Watts
Grounding When Supplying Building Systems
How Much Power Does Equipment Require?
Earth ground if supplying
Farm/Home Equipment Rating Starting Watts Running Watts
Approximate Power Requirements For Industrial Motors
Approximate Power Requirements For Farm/Home Equipment
Industrial Motors Rating Starting Watts Running Watts
Contractor Rating Starting Watts Running Watts
Approximate Power Requirements For Contractor Equipment
KVA/HP x HP x 1000 = Starting Amperage
Power Required To Start Motor
How Much Power Can Generator Supply?
Single-Phase Induction Motor Starting Requirements
Work like a Pro
Typical Connections To Supply Standby Power
Current Load Watts Amperes
Selecting Extension Cord Use Shortest Cord Possible
OM-480
116
− Parts List
125 124 123 122
120 121 117
2526 126
Dia Part Description Quantity Mkgs
128
111
Panel, Front w/Components -1Item
Panel, Front w/Components -1Item 111 Cont’d
Generator
Generator -1Item
Includes
114
Page
Page
Support
Service
Your distributor also gives
Your distributor and/or equipment manufacturer’s
To locate a Distributor or Service Agency visit
Miller Electric Mfg. Co
For assistance in filing or settling claims, contact
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