Lincoln Electric LN-7 GMA User Manual

LN-7 and LN-7 GMA Wire Feeders
(2 and 4 Roll Models)
OPERATOR’S MANUAL
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thought-
ful operation on your part. DO
NOT INSTALL, OPERATE OR
REPAIR THIS EQUIPMENT
WITHOUT READING THIS
MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED
THROUGHOUT. And, most
importantly, think before you act
and be careful.
IM351-C
June, 2010
VOLTS
NEGATIVE
ELECTRODE
POLARITY
POSITIV
E
THE LINCOLN ELECTRIC CO.
CLEVELAND, OH U.S.A.
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Le
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3126;
OSHA
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afety
a
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Standards,
2
9 C
FR
1910 A
vailable
from U
.S. Government
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FUMES AND G
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our
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se
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W
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AR
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or
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ater
ia
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W
ear
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y p
rote
ct
i
o
n
LN-7 GMA CONTROL
WIRE SPEED
INCHES PER MINUTE
100
200
150
250
700
650
600
550
500
450
400
350
300
S
E
R
I
A
L
N
O
.
CODE NO.
LN-7
NEM
A EW3
115V, 50/60 HZ AMPS
This machine a
nd the ac
cessories are cov
e
re
d by one or m
ore
of the
follo
win
g
patents: U
nited
s
ta
tes 3,8
06,6
95; 3.975
,616; 4,246,463;
4
,247,751; Australia 467,4
47; 499,5
02; 517,120; 525
,541; B
razil 79
,787; P
I
7,8
03,421; PI 7,9
05,509; Canada 965,487
; 1,041
,181
; 1,0
93
,159
; 1,1
19,674
;
European Pa
tent 8527
(France, W
es
t G
erma
ny
, United Kingdom,
Netherlands
, Italy
, Swe
den); Fra
nce 7
3.01477; 7
5 34477
; 78 14
757l Italy
1,102,5
02; Mexico 147,019; S
. Korea 19064; S
weden 78051
12
-5; U
nited
King
dom 1,529,7
26; 1,5
79,7
00; W
. G
ermany 25 50
278; 28 23 2
93.
Other patents
pending.
LN-7 GMA shown with optional
K417 digital meter kit and K418
GMA timer kit.
For machines with code numbers: 9100 and above
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
• World's Leader in Welding and Cutting Products •
Copyright © Lincoln Global Inc.

Lincoln Electric LN-7 GMA Specifications

General

Brand	Lincoln Electric
Model	LN-7 GMA
Category	Welding Accessories
Language	English

Summary

SAFETY

CALIFORNIA PROPOSITION 65 WARNINGS

State-specific warnings regarding chemical exposure from engine exhaust.

ELECTRIC AND MAGNETIC FIELDS

Information on potential health effects of EMF fields and precautions for welders.

ELECTRIC SHOCK HAZARDS

Precautions to prevent electric shock, including insulation and dry conditions.

ARC RAYS AND BURNS

Guidance on protecting eyes and skin from arc rays and spatter.

FUMES AND GASES

Safety measures for hazardous welding fumes and gases, emphasizing ventilation.

FIRE AND EXPLOSION RISKS

Prevention of fires and explosions from welding sparks and flammable materials.

PRESSURIZED CYLINDER SAFETY

Guidelines for safe handling and positioning of compressed gas cylinders.

ELECTRICALLY POWERED EQUIPMENT SAFETY

Safety measures for electrically powered equipment, including grounding and power disconnect.

INSTALLATION

TECHNICAL SPECIFICATIONS

Key technical data including wire feed speed, wire diameters, and physical dimensions.

MOUNTING LOCATION AND GROUNDING

Procedures for secure mounting and electrical grounding of the wire feeder.

INPUT CABLE CONNECTIONS

Details on connecting input control cables to various Lincoln power sources.

WORK AND GUN CABLE CONNECTIONS

Guidance on connecting work cables and gun cable assemblies.

WATER AND GAS CONNECTIONS

Procedures for connecting water cooling systems and shielding gas.

OPERATION

SAFETY INSTRUCTIONS AND GENERAL DESCRIPTION

Overview of safety procedures and product features for the wire feeder.

RECOMMENDED PROCESSES AND EQUIPMENT

Guidance on suitable welding processes and compatible equipment.

WIRE FEEDER CONTROLS

Explanation of key controls like wire speed, burnback, pre/postflow, and purge.

CIRCUIT PROTECTION AND GLP

Information on circuit breakers and Ground Lead Protector (GLP) functions.

DRIVE ROLL INSTALLATION

Steps for installing and changing drive rolls for two and four-roll feeders.

WIRE REEL LOADING

Instructions for loading different types of wire reels and spools.

ELECTRODE FEEDING AND BRAKE ADJUSTMENT

Steps for feeding electrode and adjusting wire reel brake tension.

ACCELERATION SETTING

How to adjust wire acceleration for optimal starting.

WIRE SPEED AND VOLTAGE ADJUSTMENT

How to set wire speed and adjust welding voltage.

MAKING A WELD

Step-by-step guide for performing a weld operation.

WIRE REEL CHANGING

Procedure for replacing an empty wire reel with a new one.

ACCESSORIES

GENERAL ACCESSORIES LIST

A list of available accessories for the wire feeder.

MOUNTING AND UNDERCARRIAGE KITS

Details on spindle kits and undercarriage for mounting the feeder.

OPTIONAL TIMER AND METER KITS

Information on optional timer kits and voltmeter features.

CABLES, GUNS, AND SOLENOID KITS

Specifications for power cables, welding guns, and solenoid kits.

WIRE REEL STANDS AND DUST SHIELDS

Information on reel mounting stands and dust shield options.

MAINTENANCE

ROUTINE MAINTENANCE

Regular checks and cleaning of drive rolls, guide tubes, and wire reels.

PERIODIC MAINTENANCE

Scheduled maintenance for motors, gearboxes, and fuses.

GUN AND CABLE MAINTENANCE

Procedures for maintaining gun cables, nozzles, and contact tips.

FLUX FEEDING SYSTEM MAINTENANCE

Steps for cleaning the flux feeding system's water and sludge trap.

CONNECTOR REQUIREMENTS

Specifications for gun cable connectors to ensure proper connection.

TROUBLESHOOTING & REPAIR

HOW TO USE TROUBLESHOOTING GUIDE

Instructions on navigating the troubleshooting section.

COMMON PROBLEMS AND SOLUTIONS

Identification and resolution of common wire feeding and arc issues.

WIRING DIAGRAM