Lincoln Electric LN-7 GMA User Manual
Description
Output Input
MIG Flux-Cored Submerged Arc
(1)
LN-7 and LN-7 GMA
Semiautomatic, Constant Speed Wire Feeders
The LN-7 and LN-7 GMA are semiautomatic constant speed wire feeders that can be
used with a variety of Lincoln engine drives, DC or CV power sources in a shop or field
environment. Both models and a Ready-Pak™ package feature Lincoln's unique drive roll
design, which provides positive feeding, quick reloading and durability for long life.
Controlled wire feed speed during starting provides clean, positive starts and minimizes
stubbing, skipping and spatter. For dependable operation and precise wire feeding in a
rugged package, choose the LN-7 or LN-7 GMA.
Publication E8.10 11/03
www.lincolnelectric.com
Processes
Advantage Lincoln
Required Options
Order
TECHNICAL SPECIFICATIONS
Recommended General Options
• The LN-7 feeds up to 3/32” (2.4mm) solid and 7/64” (2.8mm)
flux-cored wires, from 50-500 inches per minute (1.3-12.7m/min)
wire feed speed.
• The LN-7 GMA feeds up to 1/16” (1.6mm) solid and 5/64”
(2.0mm) flux-cored wires, from 75-700 inches per minute
(1.9-17.8 m/min) wire feed speed.
• Unique drive roll design provides positive feeding and quick
reloading by simply starting wire into guide tube. The drive
rolls and guide tubes are designed for long life and precise
wire feeding.
• Four-roll wire drive system available for additional wire feeding force and easier feeding of soft wires (LN-7 GMA model
only).
• Completely enclosed case protects the heavy duty wire drive
mechanism from damage, but allows easy access to drive
rolls.
• Control circuit features “cold electrode” when the gun trigger
is released for an added measure of safety.
• Low voltage (24 volts) gun trigger circuit.
• Dynamic braking system stops wire feed motor quickly to
minimize crater sticking problems.
• Three-year warranty on parts and labor.
Recommended Power Source Options
SEMIAUTOMATIC WIRE FEEDERS
11 5
VAC
Gun and Cable Assembly, Drive Roll Kit, Control Cable, Weld Power
Cable
K521 LN-7 Wire Feeder (2 Roll)
K440-2 LN-7 GMA (2 Roll) with gas solenoid valve
K567-2 LN-7 GMA (4 Roll) with gas solenoid valve
K1801-1 LN-7 GMA (2 Roll) Ready-Pak™ Wire Feeder
Universal Wire Reel Stand, Insulated Lift Bail, Caster Kit, Swivel
Platform, Spindle Adapter, Readi-Reel Adapter, Coil Adapter, Plastic
Wire Cover, Digital Voltmeter, Water Solenoid Kit, Gas Solenoid
Assembly, Gas Guard Regulator, GMA Timer Kit, Burnback Kit,
Magnetic Flux Screen Separator, Flux Screen, Continuous Flux
Feeding Tank Assembly, Undercarriage, Remote Output Control
Kit, Remote Control Adapter
CV-250, CV-300, CV400-I, CV-400, CV500-I, CV-655, V350-PRO,
DC-400, DC-600, DC-655, DC-1000
Wire Feed Wire Size Dimensions Net
Product Product Input Rated Output Speed Range Range H x W x D Weight
Name Number Power Current / Duty Cycle ipm (m/min) in. (mm) in. (mm) lbs. (kg)
Solid Cored
LN-7 K521 115 VAC 600 Amps @ 60% 50-500 .023-3/32 .045-7/64 10.9 x 9.8 x 9.6 24
(2 Roll) 50/60 Hz (1.3-12.7) (0.6-2.4) (1.2-2.8) (277 x 249 x 244) (10.9)
2.5 Amps
LN-7 GMA K440-2 75-700 .023-1/16 .045-5/64 10.9 x 9.8 x 9.6 26
(2 Roll) (1.9-17.8) (0.6-1.6) (1.2-2.0) (277 x 249 x 244) (10.9)
LN-7 GMA K567-2 75-700 .023-1/16 .045-5/64 11.1 x 11.6 x 9.7 32
(4 Roll) (1.9-17.8) (0.6-1.6) (1.2-2.0) (282 x 295 x 246) (13.8)
(1)
LN-7 model only.
Shown with options
LN-7 and LN-7 GMA
www.lincolnelectric.com
[2]
A CLOSER LOOK
PERFORMANCE
• Easy wire feeding with standard 2-roll or optional 4-roll wire drive
system.
• Unique drive roll design provides positive feeding and quick reloading by simply starting wire into guide tube. The drive rolls and
guide tubes are designed for long life and precise wire feeding.
• Dynamic braking system stops wire feed motor quickly to
minimize crater sticking problems.
• Solid state control compensates for wire drag and input line
variations to maintain accurate wire feed speed.
QUALITY AND RELIABILITY
• Control circuit features "cold electrode" when the gun trigger is
released for an added measure of safety.
• Completely enclosed case protects the heavy duty wire drive
mechanism from damage, yet allow easy access to rolls.
• Rugged and durable design recognized throughout the industry
for its long life and years of trouble-free wire feeding.
• Manufactured under a quality system certified to ISO 9001
requirements.
• Three-year warranty on parts and labor.
FEATURES
• Tool-less quick release wire drive tension system and gun cable
connections for easy wire or gun changes.
• Can be boom mounted or add optional Universal Wire Reel
Stand, casters and/or swivel platform and mount on power
source for extra versatility.
• Optional time controls for pre-flow and post-flow gas, burnback,
as well as cold inch and gas purge control.
• Optional digital display is easy to read in bright sunlight or dark
working conditions.
• Compatible with many Lincoln power sources including the
CV-250, CV-300, CV400-I, CV500-I, CV-655, V350-PRO, DC-400,
DC-600, DC-655, DC-1000, Ranger 250®, Ranger 250 LPG,
Ranger 305G, Ranger 305D, Classic® II, Classic 300G,
Classic 300D, Commander® 300, Vantage® 500,
Air Vantage® 500.
Optional time controls for pre-flow and post-flow gas,
burnback, as well as cold inch and gas purge control.
LN-7 GMA (2 roll) Ready-Pak
Wire Feeder Package (K1801-1)
SYSTEM SELECTION
Ready-Pak™ Packages
Take the hassle out of ordering - Order a Ready-Pak™
pre-assembled welding package.
LN-7 GMA 2-Roll Ready-Pak™ Wire Feeder Package
Order K1801-1
• Universal Wire Reel Stand
• 10 ft. Control Cable
• .035-.052 Drive Roll
• Guide Tube Kit
LN-7 and LN-7 GMA
www.lincolnelectric.com
[3]
A CLOSER LOOK
Connections are for current equipment design. Subject to change without notice.
CV-250
CV-300
V350-PRO
CV400-I
CV500-I
Twist-Mate
14 Pin
Control Cable
Weld Power Cable
Control Cable
Control
Cable
Adapter
Cable
Weld Power Cable
Weld Power
Cable
CV-400
CV-655
DC-400
DC-600
DC-655
Ranger® 250
Ranger 250 LPG
Ranger 305G
Ranger 305D
Classic® II
(1)
Classic 300G
(1)
Classic 300D
(1)
Commander® 300
Vantage® 500
Air Vantage® 500
Control Cables
K1818-10 Wire Feeder Control Cable -10 ft.
Extensions
K1797-25 14-pin Extension Control Cable - 25 ft.
K1797-50 14-pin Extension Control Cable - 50 ft.
Semiautomatic
Wire Feeder
Semiautomatic
Wire Feeder
Magnum gun and
cable assembly
Magnum gun and
cable assembly
Magnum gun and
cable assembly
Semiautomatic
Wire Feeder
Control Cables
K1818-10 Wire Feeder Control Cable -10 ft.
K1798 Adapter Cable - 14-pin to Terminal Strip
Extensions
K1797-25 14-pin Extension Control Cable - 25 ft.
K1797-50 14-pin Extension Control Cable - 50 ft.
DC-1000
Control Cables
K1818-10 Wire Feeder Control Cable -10 ft.
Extensions
K1797-25 14-pin Extension Control Cable - 25 ft.
K1797-50 14-pin Extension Control Cable - 50 ft.
(1)
Requires Wire Feed Module
14 Pin
Stud
Stud
Terminal
Strip
INPUT CABLE SELECTION GUIDE
Weld Power Cables
K1840-10 Twist-Mate to Lug, 1/0, 350A, 60% Duty Cycle -10 ft.
Weld Power Cables
K1842-10 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 10 ft.
K1842-35 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 35 ft.
K1842-60 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 60 ft.
K1842-110 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 110 ft.
Weld Power Cables
K1842-10 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 10 ft.
K1842-35 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 35 ft.
K1842-60 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 60 ft.
K1842-110 Lug to Lug, 3/0, 600A, 60% Duty Cycle - 110 ft.
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