Miller Electric 251 NT manual Table of Contents

WARNING

This product, when used for welding or cutting, produces fumes or gases which contain chemicals known to the State of California to cause birth defects and, in some cases, cancer. (California Health & Safety Code Section 25249.5 et seq.)

WARNING

Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.

WARNING

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

The following terms are used interchangeably throughout this manual: MIG = GMAW, Wire Welding

TIG = GTAW

Stick = SMAW

TABLE OF CONTENTS

SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USING		1
1-1.	Symbol Usage	1
1-2.	Arc Welding Hazards	1
1-3.	Engine Hazards	2
1-4. Additional Symbols For Installation, Operation, And Maintenance		3
1-5.	Principal Safety Standards	4
1-6.	EMF Information	4

SECTION 1 – CONSIGNES DE SÉCURITÉ – LIRE AVANT UTILISATION		5
1-1.	Signification des symboles	5
1-2.	Dangers relatifs au soudage à l’arc	5
1-3.	Dangers existant en relation avec le moteur	6
1-4. Dangers supplémentaires en relation avec l’installation, le fonctionnement
	et la maintenance	7
1-5.	Principales normes de sécurité	8
1-6.	Information sur les champs électromagnétiques	8

SECTION 2 – DEFINITIONS		9
2-1.	Symbol Definitions	9
SECTION 3 – SPECIFICATIONS		9
3-1. Weld, Power, And Engine Specifications		9
3-2. Dimensions, Weights, and Operating Angles		10
3-3.	Fuel Consumption	10
3-4.	Auxiliary Power Curve	11
3-5.	Duty Cycle	11
3-6.	Volt-Ampere Curves	12
SECTION 4 – INSTALLATION		13
4-1.	Installing Welding Generator	13
4-2.	Engine Prestart Checks	13
4-3. Activating The Dry Charge Battery (If Applicable)		14
4-4.	Connecting The Battery	15
4-5.	Installing Exhaust Pipe	15
4-6. Connecting To Weld Output Terminals		15
4-7. Selecting Weld Cable Sizes		16
4-8. Remote 14 Receptacle Information		16
4-9. Adjusting MIG Weld Puddle Consistency		17
SECTION 5 – OPERATING WELDING GENERATOR		18
5-1.	Front Panel Controls	18
5-2.	Remote Amperage/Voltage Control	19
SECTION 6 – OPERATING AUXILIARY EQUIPMENT		20
6-1. Auxiliary Power Receptacles And Circuit Breakers		20
6-2. Optional Auxiliary Power Receptacles		21
SECTION 7 – MAINTENANCE AND TROUBLESHOOTING		22
7-1.	Routine Maintenance	22
7-2.	Maintenance Label	23
7-3.	Servicing Air Cleaner	24
7-4. Servicing Optional Spark Arrestor		24
7-5. Changing Engine Oil, Oil Filter, And Fuel Filter		25
7-6.	Adjusting Engine Speed	26
7-7.	Overload Protection	27
7-8.	Troubleshooting	27
SECTION 8 – ELECTRICAL DIAGRAM		30
SECTION 9 – AUXILIARY POWER GUIDELINES		32
SECTION 10 – PARTS LIST		40
OPTIONS AND ACCESSORIES
WARRANTY