Lincoln Electric LN-7 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
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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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W
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AR
KS can
c
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ire
or
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.
Do n
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e
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d
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a
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fl
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ab
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ater
ia
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Do
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el
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ta
i
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ers w
h
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hav
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ld
flam
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W
ear
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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 Specifications

General

Type	Wire Feeder
Wire Diameter	0.035-0.045 in
Wire Size Range	0.030 - 0.045 in
Wire Feed Speed	50-700 in/min
Wire Feed Speed Range	50-700 in/min

Summary

SAFETY

California Proposition 65 Warnings

Warnings regarding cancer and reproductive harm from engine exhaust.

Arc Welding Hazards

General dangers of arc welding, advice for pacemakers, and EMF field information.

Electric Shock Hazards

Electrical shock risks and protective measures.

Arc Ray Hazards

Hazards of arc rays and necessary protective measures.

Fume and Gas Hazards

Dangers of welding fumes, gases, and ventilation requirements.

Fire and Explosion Hazards

Risks from welding sparks and precautions against fire/explosion.

Compressed Gas Cylinder Safety

Hazards of compressed gas cylinders and safe handling procedures.

Electrical Equipment Safety

Safety precautions for electrical equipment installation and grounding.

Transformer and Rectifier Machine Safety

Safety precautions specific to transformer and rectifier welding machines.

INSTALLATION

Technical Specifications

Key specifications including voltage, wire speed, diameter, and dimensions.

Mounting, Grounding, and Cable Connections

Procedures for mounting, grounding, and connecting input cables.

Power Source Connection Diagrams

Wiring diagrams for connecting to various Lincoln power sources.

Work Cable and Gun Cable Connections

Procedures for connecting work and gun cables.

Water Connections for Cooled Guns

Procedures for connecting water hoses for water-cooled guns.

Shielding Gas Hookup

Instructions for connecting the shielding gas hose.

OPERATION

Safety Instructions

General safety warnings for operating welding equipment.

Recommended Processes and Equipment

Guidance on recommended welding processes and compatible equipment.

Controls and Settings

Explanation of wire feeder controls, including speed, burnback, and gas timing.

Optional Controls and Switches

Details on optional controls like purge switch and polarity switch.

Circuit Protection and GLP Activation

Explanation of circuit protection and how to avoid GLP issues.

Drive Roll Installation Procedures

Instructions for changing drive rolls on two-roll and four-roll feeders.

Idle Roll Pressure Setting

Procedures for setting the idle roll pressure for optimal wire feeding.

Wire Loading Procedures

Step-by-step guides for loading different types of wire spools and reels.

Electrode Feeding and Brake Adjustment

Steps for feeding electrode and adjusting brake tension.

Wire Speed and Voltage Adjustment

Steps for setting wire speed and adjusting welding voltage.

Making a Weld

Detailed steps for performing a welding operation.

Wire Reel Changing

Procedure for changing wire reels at the end of a coil.

Flux Tank Loading

Instructions for loading flux into the tank for submerged arc welding.

ACCESSORIES

General Accessories Overview

List of available accessories and their categories.

Weld Power Cables and Welding Guns

Details on power cables and gun options.

Auxiliary Equipment Connection

How to connect auxiliary 115V AC equipment.

Specific Accessory Kits

Details on timer, voltmeter, spindle, and solenoid kits.

Attaching the Wire Reel Stand

Instructions for mounting the wire reel stand.

MAINTENANCE

Routine Maintenance: Drive Rolls, Motor, Gearbox

Regular maintenance for drive rolls, motors, gearboxes, and wire reel shafts.

Gun and Cable Maintenance

Procedures for maintaining welding guns, cables, and nozzles.

Gun Cables and Flux System Maintenance

Procedures for cleaning gun cable liners and maintaining the flux system.

Gun Cable Connector Requirements

Connector specifications for proper gun cable connection.

LN-7 Sequence of Operation

Step-by-step operational sequence without a timer kit.

TROUBLESHOOTING & REPAIR

How to Use Troubleshooting Guide

Instructions on identifying problems, causes, and solutions.

Wire Feeding and Arc Quality Problems

Troubleshooting for wire feeding and arc quality issues.

Weld Quality and Electrical Problems

Troubleshooting for weld porosity, circuit breaker trips, and electrical system issues.

WIRING DIAGRAM

LN-7 & LN-7 GMA Wiring Diagram

Overall wiring schematic for the equipment.