Miller Electric
Big Blue 251D
manual
Operating the Welding Generator, Controls See Section
Troubleshooting
Specs
Install
Parts list
Electrical Diagram
Symbol Usage
Maintenance
RUN-IN Procedure
Adjusting Engine Speed
Servicing Air Cleaner
Page 22
SECTION 6 − OPERATING THE WELDING GENERATOR
6-1.
Controls (See Section
6-
2)
1
2
3
13
4
12
11
10
9
8
7
6
5
15
14
Ref. 206 029 / 800
162-A /
800
159-D
OM-480
Page 18
Page 21
Page 23
Image 22
Page 21
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Contents
Visit our website at OM-480128 576AC January
Processes
Description
Engine Driven Welding Generator
From Miller to You
Table of Contents
Options and Accessories Warranty
Symbol Usage
Arc Welding Hazards
Engine Hazards
Compressed Air Hazards
EMF Information
Principal Safety Standards
California Proposition 65 Warnings
Radiation can cause interference
UN Choc Électrique peut tuer
Signification des symboles
− Consignes DE Sécurité − Lire Avant Utilisation
LES Fumées ET LES GAZ peuvent être dangereux
DES Pièces Chaudes peuvent provoquer des brûlures graves
LE Soudage peut provoquer un in- cendie ou une explosion
DES Particules Volantes peuvent blesser les yeux
LE Bruit peut affecter l’ouïe
LA Chaleur DU Moteur peut pro- voquer un incendie
’EXPLOSION DE LA Batterie peut
DES Organes Mobiles peuvent provoquer des blessures
’AIR Comprimé peut provoquer des blessures
Principales normes de sécurité
Information sur les champs électromagnétiques
Symbols And Definitions
− Definitions
Weld, Power, And Engine Specifications
− Specifications
Dimensions, Weights, And Operating Angles
Fuel Consumption
Curve shows typical fuel use under weld or power loads
Exceeding duty cycle can damage unit and void warranty
Duty Cycle And Overheating
AC Generator Power
Volt-Ampere Curves
Optional AC Power Plant Curves
Installing Welding Generator
− Installation
Connecting The Battery
Stop engine and let cool
Installing Muffler Pipe
Engine Prestart Checks
Fuel Do not use gasoline. Gasoline
Installing Ether Cylinder Optional Ether Starting Aid
Connecting To Weld Output Terminals
350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m
Selecting Weld Cable Sizes
150 ft 200 ft 250 ft
Put terminals
− Operating the Welding Generator
Controls See Section
Stop engine and fix trouble if either light goes on
Description Of Front Panel Controls See Section
Remote A/V Control
Do not use Ether if engine is running
Volt Duplex And Optional Gfci Receptacles
− Operating Auxiliary Equipment
X 15 a + 120 V x 10 a = 3.0 kVA/kW OM-480
Circuit Breakers CB1 And CB2
Volt Duplex Receptacle Optional
240 V 15 a AC Receptacle RC1
X 10 a + 120 V x 5 a = 3.0 kVA/kW
Connecting Optional AC Power Plant
240 Volt Twistlock Receptacle Optional
− Maintenance and Troubleshooting
Maintenance Label
Servicing Air Cleaner
To replace primary fuel filter
Servicing Fuel And Lubrication Systems
To change oil and filter
To replace secondary fuel filter
Standard Models
Adjusting Engine Speed
Models With Automatic Idle Optional
Overload Protection Servicing Optional Ether Starting Aid
Full Empty
Stop engine and let cool. Reinstall cleanout plug
Inspecting And Cleaning Optional Spark Arrestor
Troubleshooting
Welding
Engine
Generator Power
Check connections to ac power plant see Section
Maximum see Section
− Electrical Diagram
Circuit Diagram For Welding Generator
Wetstacking
− RUN-IN Procedure
Welding Generator
Stop engine Do not touch hot exhaust
Run-In Procedure Using Load Bank
Procedure at less than
From flammables Do not Perform
From flammables
Run-In Procedure Using Resistance Grid
Bank/grid
Do not perform run-in
Selecting Equipment
− Generator Power Guidelines
Grounding Generator To Truck Or Trailer Frame
Earth ground if supplying
Grounding When Supplying Building Systems
How Much Power Does Equipment Require?
Amperes x Volts = Watts
Industrial Motors Rating Starting Watts Running Watts
Approximate Power Requirements For Industrial Motors
Approximate Power Requirements For Farm/Home Equipment
Farm/Home Equipment Rating Starting Watts Running Watts
Approximate Power Requirements For Contractor Equipment
Contractor Rating Starting Watts Running Watts
Single-Phase Induction Motor Starting Requirements
Power Required To Start Motor
How Much Power Can Generator Supply?
KVA/HP x HP x 1000 = Starting Amperage
Typical Connections To Supply Standby Power
Work like a Pro
Selecting Extension Cord Use Shortest Cord Possible
Current Load Watts Amperes
OM-480
120 121 117
− Parts List
125 124 123 122
116
2526 126
Dia Part Description Quantity Mkgs
128
Panel, Front w/Components -1Item
111
Panel, Front w/Components -1Item 111 Cont’d
Generator
Generator -1Item
114
Includes
Page
Page
Your distributor also gives
Service
Support
For assistance in filing or settling claims, contact
To locate a Distributor or Service Agency visit
Miller Electric Mfg. Co
Your distributor and/or equipment manufacturer’s
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