Lincoln Electric IM731 User Manual

INVERTEC

WARNING

WARNING

AVISO DE

PRECAUCION

ATTENTION

!

!

!

!

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WARNING

REMOTE

POWER

OFF

ON

A

AMPS

A

V

VOLTS

WELD TERMINALS

SELECT

OUTPUT

HOT START

ARC CONTROL

-4

+4

+2

-2
0

-6 +6

-10

SOFT CRISP

+10

-8

+8

5

4

3

2

1

0

6

10

9

8

7

SELECT

CC-STICK 7018
CC-STICK 6010
TIG GTAW
CV-WIRE
CV-FLUX CORED

w

RETURN TO MAIN MENU

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 thought­ful operation on your part. DO

NOT INSTALL, O PE RATE OR
REP A I R THIS E Q U IPMEN T
WIT H O UT REA D I NG THI S
MAN U A L A N D T H E SA F ETY
PRE CAUT IONS CO NTAI NED
THR O U GHOUT . And , mos t

importantly, think before you act
and be careful.

®®

V350-PRO

FFoorr uussee wwiitthh mmaacchhiinneess CCooddee 1100887733,, 1100887744,, 1100887766,, 1100993344,, 1111444455

1111448811,, 1111448822,, 1111448844

IM731-C

October, 2007

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com

NRTL/C

OPERATOR’S MANUAL

Copyright © Lincoln Global Inc.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

i

SAFETY

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents
are known to the State of California to cause can­cer, birth defects, and other reproductive harm.

The Above For Diesel Engines

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box
351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available
from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

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

The Above For Gasoline Engines

i

FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.

____________________________________________________

1.c. Do not a dd the fuel near an open flame
welding arc or when the engine is running.
Stop the engine and allow it to cool before
refueling to prevent spilled fuel from vaporiz­ing on co ntact with hot engine parts and
igniting. Do not spill fuel when filling tank. If
fuel is spilled, wipe it up and do not start
engine until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in
position and in good repair.Keep hands, hair, clothing and
tools away from V-belts, gears, fans and all other moving
parts when starting, operating or repairing equipment.

____________________________________________________

1.e. I n some c ases i t may be n ec es sary t o remove safety

gu a rds t o per f orm r equ i red m aint enan c e. R e mov e
guards only when necessary and replace them when the
ma i nten ance r equ i rin g t hei r remo val i s c omp l ete .
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan.
Do not attempt to override the governor or
idler by pushing on the throttle control rods
while the engine is running.

1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric curren t flow ing t hrough any conductor causes
local ized Electric and Magnetic Fiel ds (EMF). Welding
curre nt cr eates EMF field s around welding cabl es and
welding machines

2.b. EMF fields m ay interfere with som e pacemakers, an d
welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.

2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure
them with tape when possible.

2.d.2. Nev er coil t he electrode le ad around you r body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.

2.d.4. Connect the work cable to the workpiece as close as
possible to the area being welded.

2.d.5. Do not work next to welding power source.

Mar ʻ95

ii

SAFETY

ii

ELECTRIC SHOCK can
kill.

3.a. The electrode and work (or ground) circuits
are electrically “hot” when the welder is on.
Do not touch these “hot” parts with your bare
skin or wet clothing. Wear dry, hole-fre e

gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.

In addition to the normal safety precautions, if welding
mu st be per form ed und er ele ctri call y haza rdou s
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode,
elect rode reel, welding head , nozzle or semiautomat ic
welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.

3.f.

Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. N ev er s im ultaneo us ly t ou ch e le ctrical ly “ho t” p ar ts o f
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.

3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover
plates to protect your eyes from sparks and
the rays of the arc when welding or observing
open arc welding. Headshield and filter lens
should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose
themselves to the arc rays or to hot spatter or metal.

FUMES AND GASES
can be dangerous.

5.a. Welding may pr oduce fumes and gases
hazardous to health. Avoid breathing these
fumes a nd gase s. When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

we lding with electrod es whic h re quire spe cial
ve ntil ation suc h as stainl ess or hard fac ing (see
instructions on c ontainer or MSDS) or on lea d or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
us ing l ocal exhaust or mechanica l ven til ation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
al so requ ired w hen weld ing on gal vani zed steel.

5. b. The operation of welding fume control equipment is affected
by various factors including proper use and positioning of
the equipment, maintenance of the equipment and the spe­cific welding procedure and application involved. Worker
exposure level should be checked upon installation and
periodically thereafter to be certain it is within applicable
OSHA PEL and ACGIH TLV limits.

5.c.

Do not weld in locations near chlorinated hydrocarbon
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors
form phosgene, a highly toxic gas, and other irritating prod­ucts.

vapors

to

3.j. Also see Items 6.c. and 8.

5.d. Shielding gases used for arc welding can displace air and

cause i nj ur y or d ea th . Always u se enough v en ti la ti on ,
especially in confined areas, to insure breathing air is safe.

5.e. Read and understand the manufacturerʼs instructions for this

equipment and the consumables to be used, including the
ma t eria l s afet y d a ta sh eet (MSD S ) a nd fo llo w y o ur
employerʼs safety practices. MSDS forms are available from
yo u r we ldi n g di str i but o r or fr om the m anu f act u rer .

5.f. Also see item 1.b.

AUG 06

iii

SAFETY

iii

WELDING and CUTTING
SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

Re m embe r th at weld i ng s par k s an d ho t
materials from welding can easily go through small cracks
an d openi ngs to adj ace nt a rea s. A voi d we ldi ng n ear
hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standar d Z49.1) an d the oper ating informat ion for the
equipment being used.

6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact
can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even
been “cleaned”. For information, purchase “Recommended
Safe Practices for the
Co n tain ers and Pi p ing Tha t Ha ve Hel d Ha zard ous
Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.

Sparks and spatter are thrown from the welding arc. Wear oil

6.f.
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
incre ase t he possibility of th e welding curren t passing
through lifting chains, crane cables or other alternate cir­cuits. This can create fire hazards or overheat lifting chains
or cables until they fail.

6.h. Also see item 1.c.

the w el di ng sparks f ro m starting a fi re .

though

they have

Preparation

for Welding and Cutting of

CYLINDER may explode
if damaged.

7.a. Us e o nly c o mpr e sse d g as cyl inde r s
containing the correct shielding gas for the
pr o cess u sed a nd pro p erl y oper atin g
re g ulat ors d esig ned f or t he g a s a nd

pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.

7.b. Alw ay s keep c ylinders i n an u pr ight p os it io n securel y
chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.

7.g. R ea d and follo w the i ns truct ions on compr essed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.

FOR ELECTRICALLY
powered equipment.

8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.

8.b. Inst all equipment in accor dance with the U.S. National
Electrical Code, all local codes and the manufacturerʼs
recommendations.

8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturerʼs recommendations.

6.I. Read and follow NFPA 51B “ Standard for Fire Prevention
During Welding, Cutting and Other Hot Work”, available
from NFPA, 1 Batterymarch Park,PO box 9101, Quincy, Ma
022690-9101.

6.j. Do not use a welding power source for pipe thawing.

Jan, 07

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

Pour votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suiv­antes:

Sûreté Pour Soudage A LʼArc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à lʼélectrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours
tout contact entre les parties sous tension et la peau nue
ou les vétements mouillés. Porter des gants secs et sans
trous pour isoler les mains.

b. Faire trés attention de bien sʼisoler de la masse quand on

soude dans des endroits humides, ou sur un plancher
metallique ou des grilles metalliques, principalement dans
les positions assis ou couché pour lesquelles une grande
partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble

de soudage et la machine à souder en bon et sûr état
defonctionnement.

d.Ne jamais plonger le porte-électrode dans lʼeau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à souder
parce que la tension entre les deux pinces peut être le
total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions
pour le porte-électrode sʼapplicuent aussi au pistolet de
soudage.

6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque dʼincendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé de
la masse. Un cour t-circuit acciden tal peut provoquer un
échauffement et un risque dʼincendie.

8. Sʼassurer que la masse est connectée le plus prés possible
de la zone de travail quʼil est pratique de le faire. Si on place
la masse sur la charpente de la construction ou dʼautres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de lev­age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques dʼincendie ou dʼechauffement des chaines et des
câbles jusquʼà ce quʼils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage.
Ceci est particuliérement important pour le soudage de tôles
galvanisées plombées, ou cadmiées ou tout autre métal qui
produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant
dʼo pérations de dégraissage, nettoyag e o u p istolage. La
chaleur ou les rayons de lʼarc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté,
voir le code “Code for safety in welding and cutting” CSA
Standard W 117.2-1974.

2. Dans le cas de travail au dessus du niveau du sol, se protéger
contre les chutes dans le cas ou on recoit un choc. Ne jamais
enrouler le câble-électrode autour de nʼimporte quelle partie
du corps.

3. Un coup dʼarc peut être plus sévère quʼun coup de soliel,
donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi quʼun verre blanc afin de se protéger les yeux du ray­onnement de lʼarc et des projections quand on soude ou
quand on regarde lʼarc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de
lʻarc.

c. Pr ot éger lʼ au tre pers on nel trav ai llant à proximit é au

soudage à lʼaide dʼécrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusi on sont émises de l ʼarc de
soudage. Se protéger avec des vêtements de protection libres
de lʼhuile, tels que les gants en cuir, chemise épaisse, pan­talons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où lʼon pique le laitier.

PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de
lʼélectricité et aux recommendations du fabricant. Le dispositif
de montage ou la piece à souder doit être branché à une
bonne mise à la terre.

2. Autant que possible, Iʼinstallation et lʼentretien du poste seront
effectués par un électricien qualifié.

3. Avant de faires des travaux à lʼinterieur de poste, la debranch­er à lʼinterrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur
place.

Mar. ʻ93

TThhaannkk YYoouu

vv

for selecting a QUALITY product by Lincoln Electric. We want you
to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equip­ment. Our challenge is to meet the needs of our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln
Electric for advice or information about their use of our products. We respond to our customers based on the best information in our posses­sion at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such infor­mation or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customerʼs particular purpose,
with respect to such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or
correcting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter any
warranty with respect to the sale of our products.

Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control
of, and remains the sole responsibility of the customer. Many variables beyond the control of Lincoln Electric affect the results obtained in
applying these types of fabrication methods and service requirements.

Subject to Change – This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com
for any updated information.

CUSTOMER ASSISTANCE POLICY

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.

Please record your equipment identification information below for future reference. This information can be
found on your machine nameplate.

Product _________________________________________________________________________________

Model Number ___________________________________________________________________________

Code Number or Date Code_________________________________________________________________

Serial Number____________________________________________________________________________

Date Purchased___________________________________________________________________________

Where Purchased_________________________________________________________________________

Whenever you request replacement parts or information on this equipment, always supply the information you
have recorded above. The code number is especially important when identifying the correct replacement parts.

On-Line Product Registration

- Register your machine with Lincoln Electric either via fax or over the Internet.

• For faxing: Complete the form on the back of the warranty statement included in the literature packet
accompanying this machine and fax the form per the instructions printed on it.

• For On-Line Registration: Go to our

“Product Registration”. Please complete the form and submit your registration.

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:

WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or loss of life.

CAUTION

This statement appears where the information must be followed to avoid minor personal injury or damage to this equipment.

vi vi

TABLE OF CONTENTS

Page

Installation .......................................................................................................Section A

Technical Specifications ........................................................................................A-1

Physical Dimensions .......................................................................................A-2

Safety Precautions ..........................................................................................A-3

Select Suitable Location..................................................................................A-3

Stacking ..........................................................................................................A-3

Tilting...............................................................................................................A-3

Input and Grounding Connections ..................................................................A-3

Power Cord Connection ..................................................................................A-3

Connection of Wire Feeders to V350-PRO .............................................A-3,A-4

Remote Control of Invertec .............................................................................A-5

Undercarriage Mountings................................................................................A-5

Parallel Operations..........................................................................................A-5

________________________________________________________________________

Operation .........................................................................................................Section B

Safety Precautions ................................................................................................B-1

General Description ..............................................................................................B-1

Duty Cycle .............................................................................................................B-1

Operational Features and Controls........................................................................B-1

Upper Control Panel.......................................................................................B-1, B-2

Hidden Middle Control Panel and Advance Process Panel.....................B-2 thru B-5

Weld Mode Details and Pulse Programs ........................................................B-6,B-7

Lower Case Panel .................................................................................................B-8

Remote Control of the Output Control and Weld Terminals ..................................B-8

Auxiliary Power......................................................................................................B-9

Limitations..............................................................................................................B-9

Recommended Processes ....................................................................................B-9

_______________________________________________________________________

Accessories.....................................................................................................Section C

Options / Accessories............................................................................................C-1

Construction Version .............................................................................................C-1

Factory and Advance Process Version ..............................................................................

C-1

Field Installed Options...........................................................................................C-1

Quick Disconnect Plugs.........................................................................................C-1

________________________________________________________________________

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

APACITOR DISCHARGE PROCEDURE..........................................................................D-1

C

ISUAL INSPECTION...................................................................................................D-1

V

ROUTINE MAINTENANCE ............................................................................................D-1

ERIODIC MAINTENANCE ...........................................................................................D-1

P

________________________________________________________________________

Section E ..............................................................................................Troubleshooting

Safety Precautions.................................................................................................E-1

How to Use Troubleshooting Guide.......................................................................E-1

Troubleshooting Guide ...........................................................................E-2 Thru E-3

Fault Codes ...........................................................................................................E-4

Displays .................................................................................................................E-5

________________________________________________________________________

Connection , Wiring Diagrams and Dimension Prints .................................Section F

________________________________________________________________________

Parts List .....................................................................................................P-401 Series

________________________________________________________________________

A-1

INSTALLATION

A-1

TECHNICAL SPECIFICATIONS -

INVERTEC V350-PRO

INPUT AT RATED OUTPUT

Product

Name

IInnvveerrtteecc

VV335500--PPRROO

6600//5500 HHzz

11 && 33

PPhhaassee

Input AC Rated DC Output Output Open

Voltage Amps/Volt Range Circuit

/Duty Cycle

220000
220088--223300// 335500AA // 3344VV // 6600%% AAMMPPSS 8800 VVDDCC
338800--440000// 330000AA // 3322VV //110000%% 55--442255
441155--446600//

557755

(continuous)

Voltage

RECOMMENDED INPUT WIRE AND FUSE SIZES FOR MAXIMUM RATED OUTPUT

Recommended Fuse Sizes Base On The U.S. National Electrical Code And Maximum Machine Outputs

Input 50/60 Hz

Voltage

200

208
230

380

400

415
460
575

Phases

1

1
1

1

1

1
1
1

Input Amps

300Amps @

32Volts(100%)

Not

Recommended

76
69

Not

Recommended

Not

Recommended

41
36

31

Input Amps

350Amps @

34Volts(60%)

Not

Recommended

94
85

Not

Recommended

Not

Recommended

54
42

37

Recommended

Line Cord

AWG

---

2
4

---

---

6
8
8

Maximum
Fuse size

---

125A
125A

---

---

80A
70A
50A

Notes

Note 1

Note 2
Note 2
Note 1

Note 1

Note 2

200
208
230
380
400
415
460
575

Note 1. Not rated is indicated by 4-xʼs in the box on the rating plate.
Note 2. When operating on these inputs, the line cord should be changed to an input conductor of 6 AWG or larger.

3
3
3
3
3
3
3
3

41
39
36
23
22
22
19
16

50
50
42
28
27
26
23
18

6
6
8
8
8
8
8
8

80A
80A
70A
50A
50A
50A
50A
35A

Note 2
Note 2

OUTPUT CABLES, CONNECTIONS AND LIMITATIONS

Select The output cable size based upon the following chart.
Cable sizes for Combined Length of Electrode and Work Cable (Copper) 75C rated:

DUTY CYCLE

100%

60%

CURRENT

300
350

LENGTH UP TO 200FT.(61m)

1/0
1/0

INVERTEC® V350-PRO

200-250 FT. (61-76m)

1/0
2/0

A-2

INSTALLATION

PHYSICAL DIMENSIONS

Height Width Depth
Construction
and Factory 14.8”(373mm) 13.3”(338mm) 27.8” *(706mm*) 81.0 Lbs.(36.7 Kg)

Advanced
Process 14.8”(373mm) 13.3”(338mm) 27.8” *(706mm*) 81.5 Lbs.(37.0 Kg)
and Rack

Weight with Cord

TEMPERATURE RANGES

A-2

OPERATING TEMPERATURE RANGE

-20°C to +40°C

* Overall Length Including Handle, 27.8” (706mm)

STORAGE TEMPERATURE RANGE

-40°C to +40°C

INVERTEC® V350-PRO

A-3

WARNING

REMOTE

POWER

OFF

ON

A

AMPS

A

V

VOLTS

WELD TERMINALS

SELECT

OUTPUT

LINCOLN
ELECTRIC

INVERTEC V350-PRO

WARNING

WARNING

AVISO DE

PRECAUCION

ATTENTION

!

!

!

!

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GREEN
RED

BLACK

WHITE or BROWN

INSTALLATION

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

• TURN THE INPUT POWER OFF AT
THE DISCONNECT SWITCH BEFORE
ATTEMPTING TO CONNECT OR DIS-

CONNECT INPUT POWER LINES, OUTPUT
CABLES, OR CONTROL CABLES.

• Open the access panel on the rear of the machine.

• For 200 or 230: Position the large switch to 200-

230.
For higher voltages: Position the large switch to
380-575.

• Move the "A" lead to the appropriate terminal.

POWER CORD CONNECTION

A 10 ft. power cord is provided and wired into the
machine. Follow the power cord connection instruc­tions.

A-3

• Only qualified personnel should perform this
installation.

• Connect the green/yellow lead of the power
cord to ground per U.S.National Electrical
Code.

• Incorrect connection may result in equipment
damage.

-----------------------------------------------------------------------

CAUTION

----------------------------------------------------------------------

SELECT SUITABLE LOCATION

The Invertec V350-PRO will operate in harsh environments.
Even so, it is important that simple preventative measures
are followed in order to assure long life and reliable opera­tion.

• The machine must be located where there is free circula­tion of clean air such that air movement in the back, out
the sides and bottom will not be restricted.

• Dirt and dust that can be drawn into the machine should be
kept to a minimum. Failure to observe these precautions
can result in excessive operating temperatures and nui­sance shutdown.

• Keep machine dry. Shelter from rain and snow. Do not

place on wet ground or in puddles.

CAUTION

• DO NOT MOUNT OVER COMBUSTIBLE SURFACES.

Where there is a combustible surface directly under
stationary or fixed electrical equipment, that surface
shall be covered with a steel plate at least .06”(1.6mm)
thick, which shall extend not less than 5.90”(150mm)
beyond the equipment on all sides.

-------------------------------------------------------------------------------

STACKING

V350-PRO cannot

TILTING

Place the machine directly on a secure, level surface or on a
recommended undercarriage. The machine may topple over
if this procedure is not followed.

INPUT AND GROUNDING CONNECTIONS

• Only a qualified electrician should connect the Invertec

V350-PRO. Installation should be made in accordance
with the appropriate National Electrical Code, all local
codes and the information detailed below.

• When received directly from the factory, multiple voltage
machines are internally connected for 460VAC. If 460VAC
is the desired input, then the machine may be connected
to the power system without any setup required inside the
machine.

• Initial 200VAC - 415VAC and 575VAC operation will
require an Input voltage panel setup.

be stacked.

INVERTEC® V350-PRO

Single Phase Input

Connect green lead to ground per National Electrical
Code.
Connect black and white or brown leads to power.
Wrap red lead with tape to provide 600V insulation.

Three Phase Input

Connect green lead to ground per National Electric
Code.
Connect black , red and white or bro wn leads to
power.

CONNECTIONS OF WIRE FEEDERS TO V350-PRO

LN-7 Connection Instructions

An LN- 7 c an o nly be used wit h t he “ Fact ory” &
“Advanced Process””versions of the 350-Pro.

• Turn the Invertec power switch "off".

• Connect the K480 control cable from the LN-7 to the
14-pin MS-style connector.

• Connect the electrode cable to the output terminal of
the polarity required by electrode. Connect the work
lead to the other terminal.

• Set the meter polarity switch on the front of the Invertec
to coincide with wire feeder polarity used. The wire
feeder will now display the welding voltage.

• If K480 is not avail able, see connect ion diagra m
S19404 for modification of K291 or K404 LN-7 input
cable with K867 Universal Adapter Plug.

• If a remote control such as K857 is to be used with the
LN-7, the remote can be connected directly to the 6-pin
MS-style connector on the front of the Invertec or use a
K864 adapter to connect the LN-7 and the remote to
the 14-pin MS-style connector. (See connection dia­gram S19901)

A-4

Work
Clamp

Electrode Cable

Electrode Cable

Electrode Cable

Work
Clamp

Work
Clamp

wire feeder
K1870-1

wire feeder
K1870-1

RANGER 8
SAE 400 WITH CV ADAPTER

ENGINE DRIVEN WELDERS
WITH WIRE FEED MODULE
(LOCAL MODE AND CV ADAPTER)

CV250
CV300
CV400

Output Terminals
Always Hot.

Output Terminals
Always Hot.

Order K484 Jumper
Plug Kit.

semiautomatic

semiautomatic

semiautomatic
wire feeder
K1870-1

wire feeder
K1870-1

CV655, DC400, DC600,
DC655, V350-PRO,

RANGER 9, RANGER 300 DLX
COMMANDER 300
COMMANDER 500
RANGER 2V35050
RANGER 305G

Output TerminalsOutput Terminals
Always Hot.Always Hot.

Power source contactorPower source contactor
switch must be in theswitch must be in the
"ON" position or use a "ON" position or use a
K848 Junper Plug Kit.K848 Junper Plug Kit.

ACROSS THE ARC MODEL

V350-PRO

TWIST-MATE

CONTROL CABLE MODEL

Electrode Cable

LN-10 Connection Instructions

An LN-10 can only be used with the “Factory” &
“Advanced Process””versions of the 350-Pro.

• Turn the Invertec power switch "off"

• Connect the K1505 control cable from the LN-10 to the

• Connect the electrode cable to the output terminal of

• Set the meter polarity switch on the front of the Invertec

• See the LN-10 manual for details on accessing Control

LN-15 Connection Instructions

(Factory, Construction & Advanced Process versions
can be connected.

• Turn the Invertec power switch "off".

• Connect the electrode cable to the output terminal of

• Set the meter polarity switch on the front of the Invertec

LN-25 Connection Instructions

(Factory, Construction & Advanced Process versions
can be connected.

• Turn the Invertec power switch "off".

• Connect the electrode cable to the output terminal of

• LN-25 with Remote Control options can be used with the

INSTALLATION

14-pin MS-style connector.

polarity required by the electrode. Connect the work
lead to the other terminal.

to coincide with wire feeder polarity used.

DIP Switch

polarity required by electrode. (See Figures below)

to coincide with wire feeder polarity used.

polarity required by electrode. Connect the work lead to
the other terminal.

Factory and Advanced Process version of the V350. The
6-Pin (K444-1) and 14-pin (K444-2) remotes can be con­nected directly to the 6-pin & 14-pin MS-style connectors.
The 42 Volt Remote Voltage and Output Control (K624-1)
Kit can be connected to the V350ʼs 14-pin MS-style con­nector using Remote Control Cable assembly K627- [ ].
LN-25s with a K431-1 remote kit can be connected to the
V350ʼs 14-pin MS-style connector using a K432 cable and
K876 adapter. (See connection diagram S19899). Or the
K432 cable could be modified with a K867 Universal
Adapter Plug (See connection diagram S19405) to con­nect it to the V350ʼs 14-pin MS-style connector.

INVERTEC® V350-PRO

A-4

LN-742 Connection Instructions

An LN-742 can only be used with the “Factory” &
“Advanced Process””versions of the 350-Pro.

• Turn the Invertec power switch "off"

• Either a K591 or a K593 Input cable assembly is
required to connect the LN-742 to the Invertec.

• Connect the control cable from the LN-742 to the
14-pin MS-style connector.

• Connect the electrode cable to the output terminal
of the polarity required by electrode. Connect the
work lead to the other terminal.

• Set the meter polarity switch on the front of the
Invertec to coincide with wire feeder polarity used.
The wire feeder will now display the welding volt­age.

• If a remote control such as K857 is to be used with the

LN-742, the remote can be connected directly to the 6­pin MS-style connector on the front of the Invertec or use
a K864 adapter to connect the LN-742 and the remote to
the 14-pin MS-style connector.

Cobramatic Connection Instructions

A Cobramatic can only be used with the “Factory” &
“Advanced Process””versions of the 350-Pro.

n the Invertec power switch "off"

• Tur

• Connect the control cable from the Cobramatic to
the 14-pin MS-style connector.

• Connect the electrode cable to the output terminal
of the polarity required by electrode. Connect the
work lead to the other terminal.

• Set the meter polarity switch on the front of the
Invertec to coincide with wire feeder polarity used.

• If a remote control such as K857 is to be used with
the Cobramatic, the remote can be connected
directly to the 6-pin MS-style connector on the front
of the Invertec or use a K864 adapter to connect
the cobramatic and the remote to the 14-pin MS­style connector.

TIG Module K930-2

The TIG Module connects to the Factory and Advanced
Process
control cable. Connect the K936-1 to the MS-style
connector.

The TIG Module can also be used with the V350-Pro
Construction version. A K936-4 control cable is
required to supply 115VAC to the TIG Module from
an external 115VAC supply.

V350-Pro versions with a K936-1 (9-14 pin)

A-5

3.44

21.06

27.82

5.50

10.00

MOUNTING HOLE LOCATIONS

1/4-20 NUT (4 PLACES)

NOTE: MOUNTING SCREWS CANNOT PROTRUDE MORE THAN 0.5 INCHES INSIDE THE MACHINE.

3.50

11.84

INSTALLATION

General Instructions for Connection of Wire
Feeders to V350-Pro

Wire feeders other than those listed above may be
used provided that the auxiliary power supply rating of
the V350-Pro is not exceeded. K867 universal adapter
plug is required. See connection diagram S24985 on
page F-4.

REMOTE CONTROL OF INVERTEC

Remote Control K857, Hand Amptrol K963 and Foot
Amptrol K870.

UNDERCARRIAGE MOUNTINGS

A-5

PARALLEL OPERATION

The V350-Pro are operable in parallel in CC mode.
For best results, the currents of each machine should
be reasonably equally balanced. As an example, with
two machines set up in parallel for a 400 amp proce­dure, each machine should be set to deliver approxi­mately 200 amps, not 300 amps from one and 100
amps from the other. This will minimize nuisance
shutdown conditions. In general, m ore than two
machines in parallel will not be effective due to the
voltage requirements of procedures in that power
range.

To set machine outputs, start with output control pots
and arc control pots in identical positions. Use the
output control pots to balance the currents and main­tain the desired current. The arc control pots should
be kept identical on the two machines.

INVERTEC® V350-PRO

B-1
SAFETY PRECAUTIONS

OPERATION

DUTY CYCLE

B-1

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically live parts or
electrode with skin or wet clothing.

• Insulate yourself from work and
ground.

• Always wear dry insulating gloves.

------------------------------------------------------------------------

FUMES AND GASES can be danger­ous.

• Keep your head out of fumes.

• Use ventilation or exhaust to remove
fumes from breathing zone.

------------------------------------------------------------------------

WELDING SPARKS can cause fire or
explosion.

• Keep flammable material away.

• Do not weld on closed containers.

------------------------------------------------------------------------

ARC RAYS can burn eyes and skin.

• Wear eye, ear and body
protection.

------------------------------------------------------------

See additional warning information at

front of this operatorʼs manual.

-----------------------------------------------------------

GENERAL DESCRIPTION

The Invertec V350-Pro offers multi-process CV, CC,
and DC welding and is rated 350 amps, 34 volts at a
60% duty cycle. The V350-Pro is available in either a
Construction version (no wire feeder connection and
auxiliary power) and a Factory & Advance Process
versions (includes wire feeder connection and related
power)

• The factory model is the construction model with the
addition of the Wire Feeder/Remote Adapter.

• In this form, the V350-Pro provides the hardware to
power and connect to 24, 42 or 115 VAC wire feeders.

• The advanced process model is the factory model
with an advanced process panel installed in place of
the standard mode panel. In this form, the V350-Pro
provides access to the 5 standard weld modes (Stick
Soft, Stick Crisp, TIG, CV-Wire, CV-Innershield),
gouge, constant power and pulse MIG weld modes.

• The Factory Rack model is the Factory model added
with environmental protection and input power fea­tures compatible with inverter racks sold by Lincoln
Electric Company.

The V350-Pro is rated at 350 amps, 60% duty cycle
(based on a 10 minute cycle). It is also rated at 300
amps, 100% duty cycle.

OPERATIONAL FEATURES and CONTROLS:

UPPER CONTROL PANEL

1. AMPS Meter

• Prior to STICK or TIG operation (current flow), the
meter displays preset current value (either 2 amps
or +/- 3% (e .g. 3 amps on 100 ), w hich ever is
greater).

• Prior to CV operation, the meter displays four dash­es indicating non-presettable AMPS.

• During welding, this meter displays actual average
amps.

• After welding, the meter holds the actual current
value for 5 seconds. Output adjustment while in the
"hold" period results in the "prior to operation" char­acteristics stated above. The displays blink indicat­ing that the machine is in the "Hold" period.

2. VOLT METER

• Prior to CV operation (current flow), the meter dis­plays desired preset voltage value (+/- .5V).

• Prior to STICK or TIG operation, the meter displays
the Open Circuit Voltage of the Power Source or
four dashes if the output has not been turned on.

• During welding, this meter displays actual average
volts.

• After welding, the meter holds the actual voltage
value for 5 seconds. The displays blink indicating
that the machine is in the "Hold" period.

• Output adjustment while in the "hold" period results
in the "prior to operation" characteristics stated
above.

3. OUTPUT CONTROL

• Output control is conducted via a single turn poten­tiometer.

• Adjustment is indicated by the meters as stated
above.

• When in TIG modes, this control sets the maximum
welding current. Full depression of a foot or hand
Amptrol results in the preset level of current.

4. WELD TERMINALS-REMOTE / ON

• Two status lights indicate the location of trigger con­trol as determined by the "WELD TERMINALS"
push button.

• If trigger control is local "weld terminals on", the ON
display will be lit.

• If trigger control is remote "weld terminals remotely
controlled", the REMOTE display will be lit.

• The unit will power up in "pre-determined preferred"
trigger modes.

INVERTEC® V350-PRO

B-2

REMOTEREMOTE

ONON

REMOTEREMOTE

LOCALLOCAL

WELD TERMINALSWELD TERMINALS

OUTPUTOUTPUT

CONTROLCONTROL

SELECTSELECT SELECTSELECT

MPSMPS

AA

OLTSOLTS

VV

SELECTSELECT

CC-STICK SOFT 7018CC-STICK SOFT 7018
CC-STICK CRISP 6010CC-STICK CRISP 6010
TIG GTAWTIG GTAW
CV-WIRECV-WIRE
CV-FLUX COREDCV-FLUX CORED

HOT STARTHOT START ARC CONTROLARC CONTROL

-4-4 +4+4

+2+2

-2-2

00

-6-6 +6+6

-10-10

SOFTSOFT CRISPCRISP

+10+10

-8-8

+8+8

55

44

33

22

11

00

66

1010

99

88

77

OPERATION

STICK = ON
CV = REMOTE
TIG = REMOTE if r emote ou t p u t contro l s are
attached to the machine.
TIG = 0N if remote output controls are not attached to
the machine.
For all versions, these trigger modes can be over-ridden
(switched) with the WELD TERMINALS push button. When
changed, the unit will power up in the configuration it was in
when it was last powered down.

5.

THERMAL

• This status light indicates when the power source has
been driven into thermal overload. If the output terminals
were "ON", the "ON" light will blink indicating that the out­put will be turned back on once the unit cools down to an
acceptable temperature level. If the unit was operating in
the "REMOTE" mode, the trigger will need to be opened
before or after the thermal has cleared and closed after
the machine has cooled down to an acceptable tempera­ture to establish output.

6.

CONTROL-REMOTE / LOCAL

• Two status lights indicate the location of output control as
pre-determined by the power sources auto-configure sys­tem.

• The LOCAL display will be lit when control is at the power
source.

• The REMOTE display will be lit when a remote pot/control
is detected.

These Output Control configurations can be overridden
(switc h e d ) with the CO N T R O L push butt o n . When
changed, the unit will power up in the configuration it was in
when it was last powered down.

Hidden Middle Control Panel – Process Set Up
Panel

B-2

CC-STICK SOFT: The Stick Soft process features

continuous control ranging from 5 to 425 amps. This
mode was intended for most SMAW applications, and
Arc Gouging.

• Arc Gouging: Setting the output of the Stick Soft
mode to 425 amps and/or setting the arc control to

9.5 or above will enable the arc-gouging mode. The
actual output current will depend on the size of car­bon used. The recommended maximum size carbon
is 5/16"(7.9mm).

• The Hot Start control regulates the starting current
at arc initiation. Hot Start can be adjusted from min­imum (0), with no additional current added at arc
start, to maximum (10), with double the preset cur­rent or 425 amps (max of machine) added for the
first second after arc initiation.

• The Arc Control regulates the Arc Force to adjust
the short circuit current. The minimum setting (-10)
will produce a "soft" arc and will produce minimal
spatter. The maximum setting (+10) will produce a
"crisp" arc and will minimize electrode sticking.

CC-STICK CRISP:The Stick Crisp mode features
continuous control from 5 to 425 amps. This mode
was intended primarily for pipe welding applications.

• The Hot Start control regulates the starting current
at arc initiation. Hot Start can adjust starting current
up or down by 25% of the preset value. The recom­mended setting for Hot Start is 5 where the initial
current is equal to the preset current.

• Arc Gouging: Setting the output of the stick crisp
mode to 425 amps and/or setting the arc control to

9.5 or above will enable the arc-gouging mode. The
actual output current will depend on the size of car­bon used. The recommended maximum size car­bon is 5/16”(7.9mm)

The middle control panel is removable to allow for
upgrades (see Field Installed Options/Accessories).

Additionally, this panel is hidden by an access door to
reduce appeared complexity and provide protection to
the controls.

7. WELD MODE SELECT - FACTORY AND
CONSTRUCTION (See Figure 1)

The Mode Control button selects from the following
welding modes.

INVERTEC® V350-PRO

7

11

12

FIGURE 1

1

2

5

3

6

4

8

9

10

B-3

• The Arc Control regulates the Arc Force to adjust
the short circuit current. The minimum setting (-10)
will produce a "soft" arc and will produce minimal
spatter. The maximum setting (+10) will produce a
"crisp" arc and will minimize electrode sticking.

TIG GTAW: The TIG mode features continuous con­trol from 5 to 425 amps. The TIG mode can be run in
either the TIG touch start or high frequency (optional
equipment required) assisted start mode.

• The Hot Start control selects the starting mode
desired. A setting of less than 5, the TIG lift start
mode is selected. The OCV is controlled below 10v
and the short circuit "TIG touch" current is main­tained at 25 amps independent of the preset cur­rent.

When the tungsten is lifted, an arc is initiated and
the output is regulated at the preset value. Hot start
settings between 0 and 5 regulate the arc initiation
current. A setting of 5 results in the most positive
arc initiation. A setting of 0 reduces hot start.

• Hot Start settings between 5 and 10, select high
frequency assisted starting TIG mode. In this
ran ge, t he O CV o f th e ma chine is contr olled
between 50 and 70 volts. If using the Lincoln K930­1 TIG Module, set the Hot start to 10 for maximum
OCV.

• The Arc Control is not used in the TIG mode.

OPERATION

B-3

CV-INNERSHIELD: The CV-INNERSHIELD mode

features continuous control from 10 to 45 volts. This
mode was designed for self-shielded flux cored wires
that require tight voltage control.

• The Hot Start control is not used in the CV-INNER­SHIELD mode.

• The Arc Control regulates pinch effect. At the mini­mum setting (-10), minimizes pinch and results in a
soft arc. At the maximum setting (+10), maximizes
pinch effect and results in a crisp arc. Most self­shielded wires work well at an Arc Control setting of 5.

TIG SOLENOID OPTION

The Solenoid only operates when th V350 is in the
TIG mode. If the Weld Terminals are in “Remote” then
the solenoid will open when the arc start switch is
closed. The solenoid will close after the arc switch has
been opened and the post flow time expired.

If the Weld Terminals are turned “ON”, then the sole­noid will open when the electrode is touch to the work.
The electrode needs to remain in contact with the
work to allow for gas coverage before attempting to
start the arc. The solenoid will close after the arc has
been broken and the post flow time expired.

CV-WIRE: The CV-WIRE mode features continuous
control from 10 to 40 volts. The mode was intended
for most GMAW, FCAW, and MCAW applications.

• The Hot Start control is not used in the CV-WIRE
mode.

• The Arc Control regulates pinch effect. At the mini­mum setting (-10), minimizes pinch and results in a
soft arc. Low pinch settings are preferable for weld­ing with gas mixes containing mostly inert gases. At
the maximum setting (+10), maximizes pinch effect
and results in a crisp arc. High pinch settings are
preferable for welding FCAW and GMAW with CO2.

INVERTEC® V350-PRO

B-4

MEMORYMEMORY

MEMORY BUTTON MEMORY BUTTON
(M1 THRU M8)(M1 THRU M8)

OUTPUT KNOBOUTPUT KNOB

SELECT BUTTONSELECT BUTTON
(HOT START OR ARC CONTROL)(HOT STAR T OR ARC CONTROL)

ADJUST KNOBADJUST KNOB
(0 THRU 10-HOT START)(0 THRU 10-HOT START)
(-10 THRU 0 AND(-10 THRU 0 AND
0 THRU +10-ARC CONTROL) 0 THRU +10-ARC CONTROL)

SELECT KNOB SELECT KNOB
(SCOLLS WELDING PROCESSES)(SCOLLS WELDING PROCESSES)

SELECTSELECT

ADJUST ADJUST

SELECTSELECT

7A

ADVANCE PROCESS PANEL VERSION

REMOTEREMOTE

ONON

REMOTEREMOTE

LOCALLOCAL

WELD TERMINALSWELD TERMINALS

OUTPUTOUTPUT

CONTROLCONTROL

SELECTSELECT SELECTSELECT

MPSMPS

AA

OLTSOLTS

VV

OPERATION

7A. ADVANCED PROCESS PANEL

(See Figure 2)

To program Welding modes. Select knob is used to
Scroll through all Welding modes. The Memory button
is used to store and access Welding modes into loca­tions M1 thru M8.

Modes:
In addition to the 5 welding modes described in SEC­TION 7, the Advance Process Panel allows you to

select the Following additional modes.

• Constant Power mode

In the Power Mode;
The work point will be in the Volts window. The
Amp window will have CP displayed indicating
Constant Power. Once current starts flowing and
during the 5 second “Hold” feature the displays will
show Volts and Amps respectively.

• Gouge

Air Carbon Arc Cutting (CAC-A) is a physical means
of removing base metal or weld metal by using a
carbon electrode, an electric arc and compressed
air.

B-4

• Pulsed Modes

In Pulse Modes;
The work point will be in the Amps window and
should be set close to the wire feed speed of the
wire feeder in inches per minute. The Volts window
wi ll have SPd displayed indicating Wire Feed
Speed. Once current starts flowing and during the 5
second “Hold” feature the displays will show amps
and volts.

Pu lse Mo de fea tures that are displayed while
selecting a Welding pulse mode are listed below;

Steel - .030, .035, .045, .052 – Argon Blends
Stainless Steel - .030, .035, .045 – Argon Blends &
Helium/Argon Blends

Aluminum - .035, 3/64, 1/16 – 4043 & 5356

Metal Core - .045, .052 – Argon Blends

Nickel - .035, .045 – Argon/Helium blends

FIGURE 2

INVERTEC® V350-PRO

B-5

OPERATION

CONTROLS: (See Figure 2)

The MEMORY button and SELECT knob are used

together to select a welding process and store it in
memory (M1 thru M8). The SELECT knob scrolls
through the, welding process modes and memory M1
thru M8. The MEMORY button stores the welding
process in memory.

• SELECT button" (The right button) selects between

the "Hot Start" or "Arc Control". The < will indicate
the active feature shown below.

Right Digital Window
"Hot Start" (-10 to 0 +10)
"Arc Control" (0 to 10) <

• The ADJUST knob adjusts the desired settings for

the Hot Start or Arc Control feature that is active.

B-5

5. After all adjustments have been made press and

hold the Memory button until the display changes.
The right and the left window will display a memory
position, lets say M1(or turn knob to select memory
of your choice. To store in M1 push the Memory
button again to save the Pulse Mig mode to memo­ry M1.

6. The display in the digital windows read as follows:
M1 Pulse MIG Argon Blends

Steel .035 Arc Cntrl 1.2

7. To save a second welding mode to a memory posi-

tion of your choice, turn the Select knob until the
desired welding process mode is displayed in right
digital window. Then follow steps 1 thru 6.

WELDING PROCESS MODES AVAILABLE

Stick SMAW, TIG GTAW
Gouge CAG, CV MIG GMAW
CV Flux Core, Pulse MIG

ELECTRODE MATERIAL

Steel, Metal Core, Stainless, Aluminum, Nickel

EXAMPLE OF SAVING WELDING MODES TO
MEMORY

The following example is how to select Pulse MIG
using .035 steel and store it into memory.

1. Turn the Select knob until welding process is dis-

played.

RIGHT WINDOW LEFT WINDOW

Pulse MIG Argon Blends
Steel .035

2. Wait two seconds and the right window will display
Arc Control on the second line on the right side.

Pulse MIG Argon Blends
Steel .035 Arc Cntrl ### <

8. Adjust the output control to the correct wire feed
setting and the V350-PRO is ready to weld again.
(Note: The wire feed speed setting is not stored in
memory and will need to be reset.)

9. Adjust the Arc Control and note that the M1 goes
away indicating that the V350-PRO settings no
longer match what is stored in memory. Going back
to the original settings will not bring the M1 back.
You will need to push the Memory button to recall
the original settings in M1.

Note: After all memoryʼs M1 thru M8 are used and the
welder needs to store another welding process, a new
welding process will overwrite what was originally in
the memory and will read,

Save to MEM

M1 Overwrite
M1 which stored Pulse Mig is Overwritten with the
new welding process.

3. SPd is displayed in the upper right Volts window.
The left Amps window matches the desired wire
feed speed that is set on the wire feeder. Adjust the
Output knob until desired number is displayed.

4. Start welding. If the arc length is too short turn the
Output knob up. If the arc length is too long turn
the Output knob down.

The Arc Control which is displayed in the right digital
window can be used to fine-tune the arc length and
characteristics.

INVERTEC® V350-PRO

B-6

OPERATION

WELD MODE DETAILS:

Mode Range Comments

Stick Soft 5 - 425 amps The stick soft mode is the best selection for general stick

applications.
Arc Control = Arc Force
Hot Start = Initial hot start current (min = start a match set amps, Max. =

greatest hot start current) During hot start, arc force is set at
high and is fast response.

For gouging applications: Turn current up to 425 amps.

Stick Crisp 5 - 425 amps The stick crisp mode features an aggressive arc force routine well suit-

ed for Exx10, Exx11 series electrodes.
Arc Control = Arc Force
Hot Start = Initial hot start current (Mid range = welding current and will

vary up and down with knob control.) During hot start, arc
force is set at high and is fast response.

For gouging applications: Turn current up to 425 amps.

GTAW (Tig mode) 5 - 425 amps The tig mode produces a soft, steady constant current waveform for

either touch start or high frequency assisted start DC GTAW applica­tions.
Hot Start = Min to Mid range = Touch start with low OCV
Mid to Max range = High frequency assisted starting with adjustable
OCV up to 70 volts.

B-6

GMAW - CV 10 - 45 volts The GMAW - CV mode is the best selection for general MIG welding,

Metal core, and gas shielded applications.
Arc Control = Pinch (Min = min pinch, softest arc),

(Max = max pinch, crispest arc)

FCAW-SS 10 - 45 volts The FCAW-SS mode is designed for Self Shielded Innershield products

that require tight voltage control. For example; the NR 203 series or NR

207)
Arc Control = Pinch (Min = min pinch, softest arc),

(Max = max pinch, crispest arc, )

ADVANCED PULSE PANEL WELDING PROGRAMS

Gouging 60 - 425 amps The gouging mode is a low power version of other Lincoln welding

equipment gouging programs, for example a Power Wave 455.

GMAW - Power 1 - 18 (No Units) The GMAW - Power mode features good stable short arc performance

when welding small diameter (.025 and .030 steel & stainless) wires at
low procedures. This mode also performs well welding aluminum in the
spray mode.

This mode does not allow preset voltage. In the short arc GMAW mode,
the set KW will not equal the actual Volts * Amps. The set power is reg­ulated only when an arc is present. During shorting, the output is
allowed to increase to clear the short.

INVERTEC® V350-PRO

B-7

MODE IPM*

.030 Steel 65 - 1200
.035 Steel 55 - 800
.045 Steel 50 - 700
.052 Steel 75 - 550
.045 Metal Core 50 - 650
.052 Metal Core 50 - 500
.030 Stainless Ar Blends 85 - 770
.030 Stainless He Ar CO2 110 - 770
.035 Stainless Ar Blends 65 - 770
.035 Stainless He Ar CO2 75 - 770
.045 Stainless Ar Blends 50 - 600
.045 Stainless He Ar CO2 50 - 600
.035 Aluminum 4043 100 - 700
.035 Aluminum 5356 115 - 740
3/64 Aluminum 4043 80 - 550
3/64 Aluminum 5356 85 - 700
1/16 Aluminum 4043 75 - 325
1/16 Aluminum 5356 75 - 450

OPERATION

PULSE PROGRAMS:

COMMENTS

The V350 pulse programs are non-synergic and allow independent
control of the wire feed speed and the arc length. The Output
Control Knob on the V350, adjusts an "SPD" value. Similar to trim,
the "SPD" value indicates the relative arc length setting. The value
of "SPD" is meant to be a starting point at which to set the arc
length relative to the wire feed speed. Depending on the applica­tion, the "SPD" value can be adjusted to obtain the desired arc
length.

The "SPD" value displayed on the V350 may not match the
actual wire feed speed!

The operation of the Arc Control knob on the V350 is similar to the
Power Wave series. As Arc Control is increased, the frequency is
increased and the background reduced. Decreasing Arc Control
will reduce frequency and increase background current. Arc
Control acts to fine tune the arc plasma to the specific application.
Preferred gas selections:

Steel Argon Blends = Argon with CO2 additions from 2 to 20
% or Oxygen additions from 2 to 5%.

B-7

.035 Nickel Alloys
.045 Nickel Alloys

.035 4043 (4x Pulse on Pulse) 120 - 600
3/64 4043 (4x Pulse on Pulse) 85 - 400
.035 5356 (5x Pulse on Pulse) 130 - 700
3/64 5356 (5x Pulse on Pulse) 100 - 550

*IPM (INCHES PER MINUTE)

(Non Adaptive)
(Non Adaptive)

80 - 700
75 - 550

Stainless Argon Blends = Argon with Oxygen additions up to 2%.

Stainless Argon Blends = Argon with Oxygen additions up to 2%

Stainless He Ar CO2 = ~ 90% Helium, 7 1/2 % Argon 2 1/2
CO2
Aluminum 100% Argon

The Nickel Alloy pulse programs are non adaptive. The operator
sets the output control knob to deliver the correct arc length at
desired wire feed speed and stick out. While welding, the operator
manipulates the stick out to maintain the correct arc length. This
method of operation produces very stable arc performance consid­ering the nature of nickel alloys.

Preferred gas: Argon/Helium Blends = for the best results add
helium to the argon base from 0-25%.

PULSE ON PULSE

Arc Control = Pulse on Pulse frequency. For faster travel
speed welds, the arc control should be increased.
For larger puddle, slower travel speeds, the arc control
should be decreased.

INVERTEC® V350-PRO

B-8

OPERATION

LN-10/DH-10 Wire Feeder Compatibility Note:

The LN-10 and DH-10 feeders can be used to pulse weld
and in the power mode with the panel. The displays on the
LN-10 & DH-10 do not show the wire feed speed or power.

8. HOT START and ARC CONTROL features have different

functions depending on the welding Mode that is active.
Each feature is described under the welding mode head­ing. (See Item 7 or 7.A for specified Mode Operations)

(See Figure 1 or 2)

LOWER CASE PANEL (See Figure 1)

The output studs, line switch and remote connector are
located on the lower case front.

9. Both terminals are "Twist-Mate" connectors.

The Negative terminal is configured to accept the pass
through gas system except Code 11445, which has no
gas pass-through and is equipped with “Tweco” connec­tors).

10. The METER POLARITY switch is located above the out-

put connectors. The switch provides a work connection
for wire feeder voltmeters. Place the switch in the posi­tion of the electrode polarity indicated by the decal. The

switch does not change the welding polarity.

11. 6-pin MS-style connector for remote control.

12. 14-pin MS-style connector for wire feeder connection

and remote control.

REMOTE CONTROL of the OUTPUT CONTROL a nd
WELD TERMINALS

The Invertec V350-Pro has auto sensing of remote output
controls. If after connecting or removing a remote, the
Invertec V350-Pro did not configure the way you would like
the local or remote control settings can be changed by
pushing the OUTPUT CONTROL or WELD TERMINAL but­ton. (A user cannot select between the 6 and 14 pin MS­style connectors.)

CV modes

• The remote will default to the 14-pin MS-style connector if
a remote is connected. If no remote is connected to the
14-pin MS-style connector then the remote will default to
the 6-pin MS-style connector if a remote is connected to it.

• In all of the CV modes, the WELD TERMINAL control will
default to REMOTE.

TIG mode

• The remote will default to the 6-pin MS-style if a remote
control is connected to the 6-pin MS-style and to the 14­pin MS-style connector. If a remote is not connected to the
6-pin MS-style connector then the remote will default to
the 14-pin MS-style connector if a remote is connected.

• If a remote control is connected to any of the MS-style
connectors the WELD TERMINAL control will default to
REMOTE. If there are not any remote control devices
attached the WELD TERMINAL control will default to ON.

B-8

CC-Stick modes

• The remote will default to only the 6-pin MS-style connec­tor if a remote is connected to it.

• The WELD TERMINAL control will default to ON with or
without a remote connected.

Types of Remote OUTPUT CONTROL

• The Invertec V350-Proʼs Output Control can be controlled
by either a potentiometer connected between 77 & 75 with
the wiper connected to 76 or a 0V to 10V DC supply con­nected between 76 & 75. (76 needs to be positive)

• 14-Pin Ms-style connector lead 75 is pin G, lead 76 is pin
F and lead 77 is pin E.

• 6-Pin Ms-style connector lead 75 is pin C, lead 76 is pin B
and lead 77 is pin A.

Potentiometer Control

• The total resistance should be between 2000 ohms (2K)
and 10,000 ohms (10K)

• The machine output will be at minimum when lead 76
(wiper) is at the end of the potentiometer that is connected
to 75. The machineʼs output will increase as the wiper of
the potentiometer is moved to the end that is connected to

77. (Note: In TIG mode, moving the lead 76 (wiper) to lead
77 would produce the current that has been set by the
Invertec V350-Proʼs front panel Output Control.)

• Remotes of this type offered by Lincoln Electric are the
K857, K812 and K870.

Voltage Control

• The supply should be an isolated supply. (Not referenced
to earth ground, any auxiliary power from the Invertec
V350-Pro or the welding output) The supply should be
capable of supplying at least 20mA.

• 0 volts supplied to 76 will set the Invertec V350-Pro to
minimum output for the mode that has been selected
while 10 volts supplied to 76 will set the Invertec V350-Pro
to the maximum output for the mode. (Note: In TIG mode,
10 volts supplied to lead 76 would produce the current
that has been set by the Invertec V350-Proʼs front panel
Output Control.)

Types of Remote WELD TERMINAL Control

• The Invertec V350-Proʼs Weld Terminals can be con­trolled from each of the MS-style connectors. The circuit
has a nominal OCV of 15VDC and requires a dry contact
closure (less than 100 ohms) to activate the output of the
Invertec V350-Pro.

• 14-Pin MS-style connector, the Weld Terminals are con­trolled from pin C (lead 2) and pin D (lead 4). Pin C is posi­tive.

• 6-Pin MS-style connector, the Weld Terminals are con­trolled from pin D (lead 2) and pin E (lead 4). In the 6-pin
MS-style connector pin D is positive.

INVERTEC® V350-PRO

B-9

AUXILIARY POWER

• 115VAC, 42VAC and 24VAC power is available
from the 1 4-pin M S - style c o n nector. The
Construction model of the Invertec V350-Pro does
not have the 14-pin MS-style connector) These sup­plies are intended to supply power for auxiliary
equipment like wire feeders and the TIG Module.

• 115VAC supply is rated at 2 amps and is protected by a

3.5 amp breaker.

• 42 VAC supply is rated at 5.5 amps and is protected
by a 10 amp breaker.

• 24 VAC supply is rated at 5.5 amps and is protected
by a 10 amp breaker.

LIMITATIONS

• The V350-Pro is not recommended for processes
other than those listed.

• The V350-Pro can only be used with the recom­mended equipment and options.

RECOMMENDED PROCESSES

Properly equipped, the Invertec V350-Pro supports
GMA W-P, FCAW , SM AW, GTAW and CAC-A
processes for a variety of materials, including mild
steel, stainless steel, cored wires, and aluminum.

OPERATION

B-9

INVERTEC® V350-PRO

C-1

25 mm

1 in.

WELDING CABLE

BOOT

TRIM

SET SCREW

BRASS PLUG

COPPER TUBE

ACCESSORIES

C-1

OPTIONS / ACCESSORIES

• K2176-1 Twist-Mate to Lug Adapter

• K1764-1 Inverter and Feeder Cart

• K1557 Swivel Kit

• K1702-1 Dual Cylinder Kit (For K1764-1)

• K1838-1 Valet Style Undercarriage

Welding Cable Connectors:

• K852-70 1/0-2/0 cable

• K852-95 2/0-3/0 cable

Twist-Mate Plugs and Receptacles are not used
with Code 11445.

CONSTRUCTION VERSION

K930-1 TIG Module (Requires external 115VAC supply)
K428,K446, K449 LN-25(Off the Arc)

FACTORY VERSION and
ADVANCED PROCESS VERSION

K857 Remote Output Control
K814 Arc Start Switch
K812 Hand Operated Amptrol

K870 Foot Operated Amptrol
Note: All of the above remote controls connect directly
to the 6-pin MS-style connector, with either a K864 or
K876 adapter and connect it to the 14 pin wire feeder
MS-style connector. (See Diagram in Section F-1)

K930-[ ] TIG Module

K428, K446, K449 LN-25 *

K617 (-1 or -2) K618 (-1 or -2) LN-742

K440 (-1), K567-1 LN-7 GMA

K1559-1, K1564-1 LN-10

K1499-1, K1521-1 DH-10

K1587-1 Cobramatic

*Not recommended for pulse welding

QUICK DISCONNECT PLUGS

A quick disconnect system is used for the welding
cable connections. The K852-70 is designed to
accept a welding cable size of 1/0 to 2/0.

1. Remove 25mm (1 in.) of welding cable insulation.

2. Slide rubber boot onto cable end. The boot end
may be trimmed to match the cable diameter.
Soap or other lubricant will help to slide the boot
over the cable.

3. Slide the copper tube into the brass plug.

4. Insert cable into copper tube.

5. Tighten set screw to collapse copper tube. Screw
must apply pressure against welding cable. The
top of the set screw will be well below the surface
of the brass plug after tightening.

6. Slide rubber boot over brass plug. The rubber
boot must be positioned to completely cover all
electrical surfaces after the plug is locked into the
receptacle.

FIELD INSTALLED OPTION (ALL VERSIONS)

• K1762-2 TIG Gas Control Kit

• K1763-1 Advanced Process Panel

INVERTEC® V350-PRO

D-1

CAPACITOR
TERMINALS

RESISTOR

MAINTENANCE

D-1

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically live parts or
electrode with skin or wet clothing.

• Insu l ate yourself from work and

ground

• Always wear dry insulating gloves.

------------------------------------------------------------------------

EXPLODING PARTS can cause
injury.

•

Failed parts can explode or cause other
parts to explode when power is applied.

•

Always wear a face shield and long

sleeves when servicing.

------------------------------------------------------------------------

See additional warning information
throughout this Operatorʼs Manual

-----------------------------------------------------------

CAPACITOR DISCHARGE PROCEDURE

1. Obtain a power resistor (25 ohms, 25 watts).

2. Hold resistor body with electrically insulated glove.
DO NOT TOUCH TERMINALS.
tor terminals across the two studs in the position
shown. Hold in each position for 1 second. Repeat
for all four capacitors.

Connect the resis-

VISUAL INSPECTION

Clean interior of machine with a low pressure air
stream. Make a thorough inspection of all compo­nents. Look for signs of overheating, broken leads or
other obvious problems. Many problems can be
uncovered with a good visual inspection.

ROUTINE MAINTENANCE

1. Every 6 months or so the machine should be
cleaned with a low pressure airstream. Keeping
the machine clean will result in cooler operation
and higher reliability. Be sure to clean these areas:

• All printed circuit boards

• Power switch

• Main transformer

• Input rectifier

• Auxiliary Transformer

• Reconnect Switch Area

• Fan (Blow air through the rear louvers)

2. Examine the sheet metal case for dents or breakage.

Repair the case as required. Keep the case in good con­dition to insure that high voltage parts are protected and
correct spacings are maintained. All external sheet
metal screws must be in place to insure case strength
and electrical ground continuity.

3. Use a DC voltmeter to check that voltage is not
present across the terminals on all four capacitors.

PERIODIC MAINTENANCE

Overload Protection

The machine is electrically protected from producing
high output currents. Should the output current
exceed 430A, an electronic protection circuit will
reduce the current to approximately 100A. The
machine will continue to produce this low current until
the protection circuit is reset. Reset occurs when the
output load is removed.

Thermal Protection

Thermostats protect the machine from excessive
operating temperatures. Excessive temperatures may
be caused by a lack of cooling air or operating the
machine beyond the duty cycle and output rating. If
excessive operating temperature should occur, the
thermostat will prevent output voltage or current. The
meter will remain energized during this time.

Thermostats are self-resetting once the machine cools
sufficiently. If the thermostat shutdown was caused by
excessive output or duty cycle and the fan is operating
normally, the Power Switch may be left on and the
reset should occur within a 15 minute period.

INVERTEC® V350-PRO

E-1

TROUBLESHOOTING

HOW TO USE TROUBLESHOOTING GUIDE

WARNING

Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician and
machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical
Shock, please observe all safety notes and precautions detailed throughout this manual.

__________________________________________________________________________

E-1

This Troubleshooting Guide is provided to help you
locate and repair possible machine malfunctions.
Simply follow the three-step procedure listed below.

Step 1. LOCATE PROBLEM (SYMPTOM).

Look under the column labeled “PROBLEM (SYMP­TOMS)”. This column describes possible symptoms
that the machine may exhibit. Find the listing that
best describes the symptom that the machine is
exhibiting.

Step 2. POSSIBLE CAUSE.

The second column labeled “POSSIBLE CAUSE” lists
the obvious external possibilities that may contribute
to the machine symptom.

Step 3. RECOMMENDED COURSE OF ACTION

This column prov ides a course of act ion for the
Possible Cause, generally it states to contact your
local Lincoln Authorized Field Service Facility.

If you do not understand or are unable to perform the
Recommended Course of Action safely, contact your
local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

INVERTEC® V350-PRO

E-2

PROBLEMS

(SYMPTOMS)

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

E-2

Major physical or electrical damage
is evid ent when the she et metal
covers are removed.

Input fuses keep blowing, or input
breaker keeps tripping

Machin e will not power up ( N o
lights)

1. Co n t act y our l o cal a u thoriz e d
Lincoln Electric Field Service facil­ity for technical assistance.

1. Make certain tha t the fuses or
breakers are properly sized. See
installation section of the manual
for recommended fuse and break­er sizes.

2. Welding procedure is drawing too
much output current, or duty cycle
is too high. Reduce output current,
duty cycle or both.

3. There is internal damage to the
power source. Contact an autho­rized Lincoln Electric Service facil­ity.

1. Mak e c e r t a in that the power
switch is in the "ON" position.

2. The circuit breaker in the recon­nect area may have op e ned.
Reset. Check input voltage sec­tion below.

3. Inp u t vo l t age selection made
improperly. Power down, check
input voltage reconnect according
to diagram on reconnect cover.

4. Th e 6 amp b r eaker may h ave
opened. Check for overload on
42VAC or 24VAC supply from the
14 pin MS-style connector.

1.I

f all recommended possible areas
of misadjus t m e n t h a v e b e e n
checked and the problem persists,

Contac t your local Lincoln
Author ized Field Se rvice
Facility.

1. If the displays show an Err ###
Machine wonʼt weld, canʼt get any
output.

see the fault section for corrective
action.

2. If the displays are not lit refer to

machine will not power up section.

3. If the thermal symbol is lit refer to

the thermal section.

4. If th e output termin a l s are in

remote control switch to "ON" and
check for output voltage. If output
voltage is now present check for
correct remote control connection
and operation.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

INVERTEC® V350-PRO

E-3

PROBLEMS

(SYMPTOMS)

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

E-3

Thermal symbol is lit

Wire feeder wonʼt work. Apparently
no power to wire feeder

1. Check for proper fan operation. If

fan is not operating correctly the
CB 2 amp breaker may have
opened. Check for an overload on
the 115VAC. Blow air in rear lou­vers to remove dirt from around
fan.

2. Check for material blocking intake

or exhaust louvers.

3. Blow air in the rear louvers to

clear dirt from the fan.

1. Check circuit breakers by the wire

feeder receptacles on the rear of
the machine. Reset

2. Check the control cable between

the power source and the wire
feeder for continuity.

1.I

f all recommended possible areas
of misadjus t m e n t h a v e b e e n
checked and the problem persists,

Contac t your local Lincoln
Author ized Field Service
Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

INVERTEC® V350-PRO

E-4

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

E-4

Fault Codes

Code Description Corrective Action
31 Primary over current. If condition persists The machine needs to

contact an authorized be turned off and back
Lincoln Field Service

on to reset the machine.

Shop
32 CAP bank A under voltage. Check input power Self-clearing as
33 CAP bank B under voltage. reconnect to make sure condition ceases.
34 CAP bank A over voltage. the machine
35 CAP bank B over voltage. is connected for the input
37 Soft start Failed. power being supplied. Cycle power.
39 Glitch on the primary over Check the machine Self-clearing as

current fault interrupt; possibly ground. condition ceases.
caused by noise or a signal level If problem persists
(misc. hardware fault #1) contact an authorized

Lincoln Field Service

Shop
43 CAP delta; CAP A and B are out Check input power

of balance. reconnect to make sure

the machine is

connected for the input

power being supplied.
44 Main CPU problem. The DSP Check the machine

has detected a problem with the ground.
CPU.

47 Possible erroneous electrical If problem persists

noise on Voltage/Frequence contact an authorized
capacitor feed back circuit. Lincoln Field Service

Shop

(misc. hardware fault #2)

48 The main contactor opened If condition persist Self-clearing

unexpectedly. (misc. hardware contact an authorized
fault #3) Lincoln Field Service

Shop
"bad The selected weld mode does If condition persists Press the Mode
nodeʼ not exist in the weld table that is contact an authorized Select button to
“####”

presently loaded in the machine. Lincoln Field Service select a different

Shop mode

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

INVERTEC® V350-PRO

E-5

Observe all Safety Guidelines detailed throughout this manual

TROUBLESHOOTING

Displays Description

E-5

Scrolling dash

Appears at power up while the machine is going through its self configu­ration

"Err" "####" Fault code display. The first fault to occur will be displayed for three

seconds. The display will cycle through fault codes for all faults that
persist after the initial three-second period are displayed for 1 sec­ond each.

"----" "----" Weld mode is changing

"----" "####" A constant voltage weld mode is selected, machine output is off.

The numeric value in the right display is the work point.

"####" "----" A constant current weld mode is selected, machine output is off.

The numeric value in the left display is either the work point or a
work point limit, depending on the weld mode and remote configura­tion.

"####" "####"(on steady) machine output is on. Left display is current, right display is voltage.

If actively welding, the displays are arc current and arc voltage. If
not actively welding, the display will show work point.

"####" "####" (blinking) weld just finished – the average arc voltage and current will be

blinked for 5 seconds following a weld. If the work point changes
during this 5 second period, the display will revert to the above
mode.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

INVERTEC® V350-PRO

F-1

TURN T HE PO W E R SWIT C H OF T H E WELD I N G POW E R

SOUR C E "OFF " BEFORE INSTAL L ING PL U G S ON C A BLES

OR W H E N CON N E CTING O R DISC O NNECTI N G PLUG S TO

WELD I N G POW E R SOURC E .

STRAI GHT P LUG ( 14 PIN)

TO PO WER S OURCE

CABLE RECE PTACL E (6 SO CKET)

CABLE RECE PTACL E (14 S OCKET )

TO: 1) LN -7 WI RE FEED ERS

TO: 1) K8 57 RE MO TE CO NTROL

2) K963 HAND A MPTRO L

3) K870 FOOT A MPTRO L

K864

STRAI GHT P LUG ( 14 PIN)

TO PO WER S OURCE

K876

CABLE RECE PTACL E (6 SO CKET)

TO: 1) LN -25 W IR E FEE DERS

S19 3 09

4 -19 - 96D

REMOTE CONTROL ADAPTERS

DIAGRAMS

F-1

INVERTEC® V350-PRO

F-2

N.A. WELD ING C ABLE MU ST BE SI ZE D FOR CURR ENT A ND DU TY CY CLE O F APP LICAT ION.

N.B. DIAG RAM S HOWS EL ECT RO DE PO SITIV E. T O CHA NGE P OLARI TY, T URN P OWER "OFF" ,

R EVERS E ELE CTROD E AND W ORK C ABLE AT PO WER S OURCE .

N.C. INSU LATE EACH UN USE D LEA D INDIV IDUAL LY.

ELECT RODE CABLE

TO LN -7

TO

WORK

-

+

14 PI N

AMPHE NOL

SPARE

82

81

42

41

31

32

2

4

21

GND

75

76

77

31

32

2

4

21

GND

N.C.

K291 OR K4 04

INPUT CABL E

K775 OPTIO NAL

REMOT E CON TROL

K867 UNIVE RSAL

ADAPT ER PL UG

LN-7

CONTR OL

BOX

75

76

77

GREEN

N.D.

N.D. SPLI CE LE ADS A ND IN SU LAT E.

POWER SOUR CE

AUXIL IARY POWER

Only q u a lified p e r sons sh o u l d instal l , use or

serv i c e this ma c h i ne.

usin g t h e disco n n e ct swit c h a t the f u s e box

WARNING

Turn o f f input p o w er to t h e W elding P o w er Sour c e

Befo r e c onnecti n g the wir e f e eder.

ELECTRIC

SHOCK

CAN KILL

INVER TEC

WITH 115VA C

S19 4 04

N.A. WELD ING C ABLE MU ST BE SI ZE D FOR CURR ENT A ND DU TY CY CLE O F APP LICAT ION.

N.B. DIAG RAM S HOWS EL ECT RO DE PO SITIV E. T O CHA NGE P OLARI TY, T URN P OWER "OFF" ,

R EVERS E ELE CTROD E AND W ORK C ABLE AT PO WER S OURCE .

N.C. INSU LATE EACH UN USE D LEA D INDIV IDUAL LY.

ELECT RODE CABLE

TO LN -7

TO

WORK

-

+

14 PI N

AMPHE NOL

SPARE

82

81

42

41

31

32

2

4

21

GND

75

76

77

31

32

2

4

21

GND

N.C.

K291 OR K4 04

INPUT CABL E

K775 OPTIO NAL

REMOT E CON TROL

K867 UNIVE RSAL

ADAPT ER PL UG

LN-7

CONTR OL

BOX

75

76

77

GREEN

N.D.

N.D. SPLI CE LE ADS A ND IN SU LAT E.

POWER SOUR CE

AUXIL IARY POWER

Only q u a lified p e r sons sh o u l d instal l , use or

serv i c e this ma c h i ne.

usin g t h e disco n n e ct swit c h a t the f u s e box

WARNING

Turn o f f input p o w er to t h e W elding P o w er Sour c e

Befo r e c onnecti n g the wir e f e eder.

ELECTRIC

SHOCK

CAN KILL

INVER TEC

WITH 115VA C

S19 4 04

1 2-1 0 -93 A

K867 PLUG TO LN-7 - CONNECTION DIAGRAM

DIAGRAMS

F-2

INVERTEC® V350-PRO

F-3

N.A . WEL DIN G C ABL E M UST BE SI ZED FO R C URR ENT AN D D UTY CY CLE OF AP PLI CAT ION .

N.B . DIA GRA M S HOW S E LEC TRO DE POS ITI VE. T O C HAN GE POL ARI TY, TU RN POW ER "OF F",

RE VER SE ELE CTR ODE AN D W ORK CA BLE AT PO WER SO URC E.

N.C . INS ULA TE EAC H U NUS ED LEA D I NDI VID UAL LY.

TO

WOR K

-

+

14 PIN

AMP HEN OL

N.C .

ELE CTR ODE CA BLE

TO LN- 25

K86 7 A DAP TER

LN- 25 WIT H

K43 1 O PTI ON

K43 2 R EMO TE

CON TRO L C ABL E

E

F

D

A

B

C77

76

75

SPA RE

4

2

218281

42

41

GND

31

32

N.D .

N.D . REM OVE 6 PIN PL UG FRO M K43 2 C ABL E I N O RDE R T O C ONN ECT K8 67 PLU G.

LA BEL EA CH LEA D ( A T HRU F) AS TH EY ARE RE MOV ED FRO M 6 PI N P LUG .

N.E .

N.E . SPL ICE LE ADS AN D I NSU LAT E.

Onl y quali f i ed pe r s ons s h o uld i n s tall, u se or

ser v i ce th i s mach i n e.

usi n g the d i sconn e c t swi t c h at t h e fus e box

WARNING

Tur n off i n p ut po w e r to t h e Wel d i ng Po w e r Sou r c e

Bef o r e con n e cting t he wi r e feed e r .

ELECTRIC

SHOCK

CAN KILL

INV ERT EC

POW ER SOU RCE

S1 9 405

1 -2 5 -91

K867 PLUG TO LN-25 - CONNECTION DIAGRAM

DIAGRAMS

F-3

INVERTEC® V350-PRO

F-4

N.A. WELD ING C ABLE MUST BE SI ZED F OR CU RRENT AND DUTY CYCLE OF A PPLIC ATION .

N.B. DIAG RAM S HOWS ELECT RODE POSIT IVE. TO C HANGE POLA RITY, TURN POWE R "OF F",

RE VERSE ELEC TRODE AND WORK CABLE AT P OWER SOURC E.

N.C. INSU LATE EACH UNUSE D LEA D IND IVIDU ALLY.

TO

WORK

-

+

14 PI N

AMPHE NOL

N.C.

76

82

K867 UNIVE RSAL

ADAPT ER PL UG

81

SPARE

2

4

41

4

2

31

32

GND

21

77

75

REM OTE OUTP UT CONT ROL

NOT USE D ON IN VERT EC

CON NECT TOG ETH ER F OR W ELDI NG O UTP UT

24 VAC / 5. 5 A MP

24 VAC / 5. 5 A MP

42 VAC / 5. 5 A MP

115 VAC / 2 AM P

INV ERTE C FR AME CON NECT ION

N.D.

N.D. FOR WIRE FEEDE RS TH AT RE TURN A SIG NAL F OR WE LDING OUTP UT, U SE IS OLATI ON

RE LAY T O CLO SE LE ADS 2 & 4.

2

4

TO

K867

ELECT RODE CABLE

WIR E FE EDER VO LTME TER CONN ECT I ON

CON NECT S TO (W ORK TERM INAL ) O F IN VERT EC

TO

WIRE FEEDE R

10K

MIN .

Only q u alified p e r sons s h o u l d insta l l , use or

serv i c e this m a c h i ne.

usin g t he disc o n n e ct swi t c h at the f u s e box

WARNING

Turn o f f input p o w er to t h e Welding P o wer Sou r c e

Befo r e connect i n g the wi r e f eeder.

ELECTRIC

SHOCK

CAN KILL

INVER TEC

POWER SOUR CE

WITH 115VA C

AUXIL IARY POWER

S24 9 85

3-1 - 00

K867 UNIVERSAL ADAPTER / INVERTEC - CONNECTION DIAGRAM

DIAGRAMS

F-4

INVERTEC® V350-PRO

F-5

Only q u alified p e r sons s h o u l d insta l l , use or

serv i c e this m a c h i ne.

usin g t he disc o n n e ct swi t c h at the f u s e box

WARNING

Turn o f f input p o w er to t h e Welding P o wer Sou r c e

Befo r e connect i n g the wi r e f eeder.

ELECTRIC

SHOCK

CAN KILL

N.A. WELD ING C ABLE MUST BE SI ZED F OR CU RRENT AND DUTY CYCLE OF A PPLIC ATION .

N.B. DIAG RAM S HOWS ELECT RODE POSIT IVE. TO C HANGE POLA RITY, TURN POWE R "OF F",

R EVERS E ELE CTROD E AND WORK CABL E AT POWER SOUR CE.

TO

WORK

-

+

14 PI N

AMPHE NOL

ELECT RODE CABLE

TO LN -25

LN-25 WITH

K431 OPTIO N

K432 REMOT E

CONTR OL CA BLE

6 PIN

AMPHE NOL

N.C. FOR INVER TECS WITH 6 PIN AMPH ENOL, K432 CABL E CAN BE C ONNEC TED D IRECT LY.

K876 ADAPT ER

INVER TEC

POWER SOUR CE

S19 8 99

1 -25 - 91

K876 ADAPTER TO LN-25 - CONNECTION DIAGRAM

DIAGRAMS

F-5

INVERTEC® V350-PRO

F-6

Only q u alified p e r sons s h o u l d insta l l , use or

serv i c e this m a c h i ne.

usin g t he disc o n n e ct swi t c h at the f u s e box

WARNING

Turn o f f input p o w er to t h e Welding P o wer Sou r c e

Befo r e connect i n g the wi r e f eeder.

ELECTRIC

SHOCK

CAN KILL

N.A. WELD ING C ABLE MUST BE SI ZED F OR CU RRENT AND DUTY CYCLE OF A PPLIC ATION .

N.B. DIAG RAM S HOWS ELECT RODE POSIT IVE. TO C HANGE POLA RITY, TURN POWE R "OF F",

R EVERS E ELE CTROD E AND WORK CABL E AT POWER SOUR CE.

ELECT RODE CABLE

TO LN -7

TO

WORK

-

+

14 PI N

AMPHE NOL

LN-7

CONTR OL

BOX

POWER SOUR CE

INVER TEC

K864

K480- 7 INP UT CA BLE

14 PI N

AMPHE NOL

K857

REMOT E CON TROL

K963

HAND AMPTR OL

K870

FOOT AMPTR OL

N.C. K480 -7 IN PUT C ABLE CAN B E CON NECTE D DIR ECTLY IF R EMOTE CONT ROL I S NOT REQU IRED.

6 PIN

AMPHE NOL

ADAPT ER

OR

OR

N.D. K864 ADAP TER C ANNOT BE U SED W ITH A N LN- 25.

WITH 115VA C

AUXIL IARY POWER

S19 9 01

4 -19 - 96 D

K864 ADAPTER TO LN-7 & REMOTE CONTROL - CONNECTION DIAGRAM

DIAGRAMS

F-6

INVERTEC® V350-PRO

F-7

DIAGRAMS

F-7

INVERTEC® V350-PRO

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted inside

the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number.

F-8

DIAGRAMS

F-8

INVERTEC® V350-PRO

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted inside

the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number.

F-9

M19527

6-

01

14.79

12.44

3.44

21.06

27.82

5.50

10.00

MOUNTING HOLE LOCATIONS

13.10

1/4-20 NUT (4 PLACES)

NOTE: MOUNTING SCREWS CANNOT PROTRUDE MORE THAN 0.5 INCHES INSIDE THE MACHINE.

3.50

11.84

DIMENSION PRINT

F-9

INVERTEC® V350-PRO

WARNING

Spanish

AVISO DE

PRECAUCION

● Do not touch electrically live parts or

electrode with skin or wet clothing.

● Insulate yourself from work and

ground.

● No toque las partes o los electrodos

bajo carga con la piel o ropa moja­da.

● Aislese del trabajo y de la tierra.

● Keep flammable materials away.

● Mantenga el material combustible

fuera del área de trabajo.

● Wear eye, ear and body protection.

● Protéjase los ojos, los oídos y el

cuerpo.

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

Korean

Arabic

● Ne laissez ni la peau ni des vête-

ments mouillés entrer en contact
avec des pièces sous tension.

● Isolez-vous du travail et de la terre.

● Berühren Sie keine stromführenden

Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!

● Isolieren Sie sich von den

Elektroden und dem Erdboden!

● Não toque partes elétricas e elec-

trodos com a pele ou roupa molha­da.

● Isole-se da peça e terra.

● Gardez à l’écart de tout matériel

inflammable.

● Entfernen Sie brennbarres Material!

● Mantenha inflamáveis bem guarda-

dos.

● Protégez vos yeux, vos oreilles et

votre corps.

● Tragen Sie Augen-, Ohren- und Kör-

perschutz!

● Use proteção para a vista, ouvido e

corpo.

READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE
USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.

SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS
CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.

LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A
ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.

LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HER­STELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.

● Keep your head out of fumes.

● Use ventilation or exhaust to

remove fumes from breathing zone.

● Turn power off before servicing.

● Do not operate with panel open or

guards off.

WARNING

● Los humos fuera de la zona de res-

piración.

● Mantenga la cabeza fuera de los

humos. Utilice ventilación o
aspiración para gases.

● Gardez la tête à l’écart des fumées.

● Utilisez un ventilateur ou un aspira-

teur pour ôter les fumées des zones
de travail.

● Vermeiden Sie das Einatmen von

Schweibrauch!

● Sorgen Sie für gute Be- und

Entlüftung des Arbeitsplatzes!

● Mantenha seu rosto da fumaça.

● Use ventilação e exhaustão para

remover fumo da zona respiratória.

● Desconectar el cable de ali-

mentación de poder de la máquina
antes de iniciar cualquier servicio.

● Débranchez le courant avant

l’entretien.

● Strom vor Wartungsarbeiten

abschalten! (Netzstrom völlig öff­nen; Maschine anhalten!)

● Não opere com as tampas removidas.

● Desligue a corrente antes de fazer

serviço.

● Não toque as partes elétricas nuas.

● No operar con panel abierto o

guardas quitadas.

● N’opérez pas avec les panneaux

ouverts ou avec les dispositifs de
protection enlevés.

● Anlage nie ohne Schutzgehäuse

oder Innenschutzverkleidung in
Betrieb setzen!

● Mantenha-se afastado das partes

moventes.

● Não opere com os paineis abertos

ou guardas removidas.

Spanish

AVISO DE

PRECAUCION

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

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LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS
PRÁTICAS DE SEGURANÇA DO EMPREGADOR.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com