Lincoln INVERTEC V350-PRO CE User manual

INVERTEC V350-PRO (CE)
OPERATOR’S MANUAL
For use with machines Code; 10670
IM708
January, 2001
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thought-
ful operation on your part. DO
NOT INSTALL, OPERATE OR
REPAIR THIS EQUIPMENT
WITHOUT READING THIS
MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED
THROUGHOUT. And, most
importantly, think before you act
and be careful.
™
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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Date of Purchase:
Serial Number:
Code Number:
Model:
Where Purchased:
•Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com
•World's Leader in Welding and Cutting Products •
IEC 974-1
IP21S
Copyright © 2001 Lincoln Global Inc.
ISO 9001
CERTIFICATE NUMBER: 30273
Designed and Manufactured Under a
Quality Program Certified by
ABS Quality Evaluations, Inc.
to ISO 9001 Requirements.
QMS
ANSI RAB

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 add 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 vaporiz-
ing on contact 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. In some cases it may be necessary to remove safety
guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
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.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.
i
SAFETY
i
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.
WARNING
Mar ‘95
ELECTRIC AND
MAGNETIC FIELDS
may be dangerous
2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines
2.b. EMF fields may interfere with some pacemakers, and
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. Never coil the electrode lead around your 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.
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.
1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.
CALIFORNIA PROPOSITION 65 WARNINGS
Diesel engine exhaust and some of its constituents
are known to the State of California to cause can-
cer, birth defects, and other reproductive harm.
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 Diesel Engines The Above For Gasoline Engines

ii
SAFETY
ii
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.
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-free
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
must be performed under electrically hazardous
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,
electrode reel, welding head, nozzle or semiautomatic
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. Never simultaneously touch electrically “hot”parts of
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.
3.j. Also see Items 6.c. and 8.
FUMES AND GASES
can be dangerous.
5.a.Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.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
welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead 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)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.
5.b.
Do not weld in locations near chlorinated hydrocarbon vapors
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors to
form phosgene, a highly toxic gas, and other irritating prod-
ucts.
5.c. Shielding gases used for arc welding can displace air and
cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.
5.d. Read and understand the manufacturer’s instructions for this
equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.
5.e. Also see item 1.b.
Mar ‘95

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. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.
8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.
CYLINDER may explode
if damaged.
7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and
pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.
7.b. Always keep cylinders in an upright position securely
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. Read and follow the instructions on compressed 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.
iii
SAFETY
iii
Mar ‘95
WELDING SPARKS can
cause fire or explosion.
6.a. Remove fire hazards from the welding area.
If this is not possible, cover them to prevent
the welding sparks from starting a fire.
Remember that welding sparks and hot
materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
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
Standard Z49.1) and the operating information 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
though they have
been “cleaned”. For information, purchase “Recommended
Safe Practices for the Preparation for Welding and Cutting of
Containers and Piping That Have Held Hazardous
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.
6.f.
Sparks and spatter are thrown from the welding arc. Wear oil
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
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate cir-
cuits. This can create fire hazards or overheat lifting chains
or cables until they fail.
6.h. Also see item 1.c.

iv
SAFETY
iv
PRÉCAUTIONS DE SÛRETÉ
Pour votre propre protection lire et observer toutes les instructions
et les précautions de sûretéspecifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûretégénérales suiv-
antes:
Sûreté Pour Soudage A L’Arc
1. Protegez-vous contre la secousse électrique:
a. Les circuits àl’électrode et àla piéce sont sous tension
quand la machine àsouder 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 s’isoler 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 couchépour 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 àsouder en bon et sûrétat
defonctionnement.
d.Ne jamais plonger le porte-électrode dans l’eau pour le
refroidir.
e. Ne jamais toucher simultanément les parties sous tension
des porte-électrodes connectésàdeux machines àsouder
parce que la tension entre les deux pinces peut être le
total de la tension àvide des deux machines.
f. Si on utilise la machine àsouder comme une source de
courant pour soudage semi-automatique, ces precautions
pour le porte-électrode s’applicuent aussi au pistolet de
soudage.
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 n’importe quelle partie
du corps.
3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:
a. Utiliser un bon masque avec un verre filtrant approprié
ainsi qu’un verre blanc afin de se protéger les yeux du ray-
onnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.
b. Porter des vêtements convenables afin de protéger la
peau de soudeur et des aides contre le rayonnement de
l‘arc.
c. Protéger l’autre personnel travaillant àproximitéau
soudage àl’aide d’écrans appropriés et non-inflammables.
4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection libres
de l’huile, tels que les gants en cuir, chemise épaisse, pan-
talons sans revers, et chaussures montantes.
5. Toujours porter des lunettes de sécuritédans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones oùl’on pique le laitier.
6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dûaux étincelles.
7. Quand on ne soude pas, poser la pince àune endroit isoléde
la masse. Un court-circuit accidental peut provoquer un
échauffement et un risque d’incendie.
8. S’assurer que la masse est connectée le plus prés possible
de la zone de travail qu’il est pratique de le faire. Si on place
la masse sur la charpente de la construction ou d’autres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de lev-
age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils 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
d’opérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de l’arc 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.
PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR
1. Relier àla terre le chassis du poste conformement au code de
l’électricitéet aux recommendations du fabricant. Le dispositif
de montage ou la piece àsouder doit être branchéàune
bonne mise àla terre.
2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.
3. Avant de faires des travaux àl’interieur de poste, la debranch-
er àl’interrupteur àla boite de fusibles.
4. Garder tous les couvercles et dispositifs de sûretéàleur
place.
Mar. ‘93

v
SAFETY
v
V350-PRO (CE)
L10093
3-1-96H
Conformance
standard: EN 50 199 Electromagnetic Compatibility (EMC) Product Standard for Arc Welding Equipment. It
All electrical equipment generates small amounts of electromagnetic emission. Electrical emission may be
received by other equipment, electrical interference may result. Electrical emissions may affect many kinds of
telephone systems, computers, etc. Be aware that interference may result and extra precautions may be required
If electromagnetic disturbances are detected then it shall be the responsibility of the user of the welding equipment
to resolve the situation with the technical assistance of the manufacturer. In some cases this remedial action may
electromagnetic disturbances must be reduced to the point where they are no longer troublesome.
assess whether the changes will increase the risk of injury, e.g., by allowing parallel welding
surrounding area. The following shall be taken into account:
welding equipment;
b) radio and television transmitters and receivers;
d) safety critical equipment, e.g., guarding of industrial equipment;
e) the health of the people around, e.g., the use of pacemakers and hearing aids;
f) equipment used for calibration or measurement;
used in the environment is compatible. This may require additional protection measures;
ELECTROMAGNETIC COMPATIBILITY (EMC)
Products displaying the CE mark are in conformity with European Community Council Directive of 3 May
1989 on the approximation of the laws of the Member States relating to electromagnetic compatibility
(89/336/EEC). It was manufactured in conformity with a national standard that implements a harmonized
is for use with other Lincoln Electric equipment. It is designed for industrial and professional use.
Introduction
transmitted through power lines or radiated through space, similar to a radio transmitter. When emissions are
electrical equipment; other nearby welding equipment, radio and TV reception, numerical controlled machines,
when a welding power source is used in a domestic establishment.
Installation and Use
The user is responsible for installing and using the welding equipment according to the manufacturer s instructions.
be as simple as earthing (grounding) the welding circuit, see Note. In other cases it could involve constructing an
electromagnetic screen enclosing the power source and the work complete with associated input filters. In all cases
Note: The welding circuit may or may not be earthed for safety reasons according to national codes.
Changing the earthing arrangements should only be authorized by a person who is competent to
current return paths which may damage the earth circuits of other equipment.
Assessment of Area
Before installing welding equipment the user shall make an assessment of potential electromagnetic problems in the
a) other supply cables, control cables, signaling and telephone cables;above, below and adjacent to the
c) computer and other control equipment;
g) the immunity of other equipment in the environment. The user shall ensure that other equipment being
h) the time of day that welding or other activities are to be carried out.

vi
SAFETY
vi
V350-PRO (CE)
The size of the surrounding area to be considered will depend on the structure of the building and othe
r
Methods of Reducing Emissions
Consideration should be given to shielding the supply cable of permanently installed welding equipmen
t
conduit or equivalent. Shielding should be electrically continuous throughout its length. The shielding
s
connected to the welding power source so that good electrical contact is maintained between the cond
u
welding power source enclosure.
access and service doors and covers should be closed and properly fastened when the welding equip
m
be adjusted and maintained according to the manufacturer s recommendations.
The welding cables should be kept as short as possible and should be positioned close together, runni
n
to the floor level.
Equipotential Bonding
touching these metallic components and the electrode at the same time. The operator should be insula
Earthing of the Workpiece
of injury to users, or damage to other electrical equipment. Where necessary, the connection of the wo
r
Screening and Shielding
Selective screening and shielding of other cables and equipment in the surrounding area may alleviate
p
interference. Screening of the entire welding installation may be considered for special applications.
Portions of the preceding text are contained in EN50199:"Electromagnetic Compatibility (EMC) pr
o
arc welding equipment."
1
1
ELECTROMAGNETIC COMPATIBILITY (EMC)
that are taking place. The surrounding area may extend beyond the boundaries of the premises.
Mains Supply
Welding equipment should be connected to the mains supply according to the manufacturer s recomm
e
If interference occurs, it may be necessary to take additional precautions such as filtering of the mains
s
Maintenance of the Welding Equipment
The welding equipment should be routinely maintained according to the manufacturer s recommendati
o
operation. The welding equipment should not be modified in any way except for those changes and adj
covered in the manufacturers instructions. In particular, the spark gaps of arc striking and stabilizing d
e
Welding Cables
Bonding of all metallic components in the welding installation and adjacent to it should be considered.
H
metallic components bonded to the work piece will increase the risk that the operator could receive a s
h
such bonded metallic components.
Where the workpiece is not bonded to earth for electrical safety, not connected to earth because of its
s
position, e.g., ships hull or building steelwork, a connection bonding the workpiece to earth may reduce
in some, but not all instances. Care should be taken to prevent the earthing of the workpiece increasin
g
earth should be made by a direct connection to the workpiece, but in some countries where direct conn
permitted, the bonding should be achieved by suitable capacitance, selected according to national regu

Thank You 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!
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:
WARNING
This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.
This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.
CAUTION
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.
Model Name & Number _____________________________________
Code & Serial Number _____________________________________
Date of Purchase _____________________________________
Whenever you request replacement parts for or information on this equipment always supply the information
you have recorded above.
viivii

viii
viii TABLE OF CONTENTS Page
Installation.......................................................................................................Section A
Technical Specifications........................................................................................A-1
Safety Precautions..........................................................................................A-2
Select Suitable Location..................................................................................A-2
Stacking ..........................................................................................................A-2
Tilting...............................................................................................................A-2
Input and Grounding Connections ..................................................................A-2
Power Cord Connection..................................................................................A-2
Connection of Wire Feeders to V350-PRO (CE).............................................A-2
Remote Control of Invertec.............................................................................A-3
Undercarriage Mountings................................................................................A-3
Parallel Operations..........................................................................................A-4
Ouick Disconnect Plugs..................................................................................A-4
Operation.........................................................................................................Section B
Additional Safety Precautions ...............................................................................B-1
General Description and Duty Cycle......................................................................B-1
Operational Features and Controls.........................................................B-1 Thru B-3
Remote Control of the Output Control and Weld Terminals..................................B-3
Design Features and Advantages .........................................................................B-4
Auxiliary Power......................................................................................................B-5
Limitations..............................................................................................................B-5
Recommended Processes ....................................................................................B-5
Accessories.....................................................................................................Section C
General Options / Accessories..............................................................................C-1
“CE”Version........................................................................................................................ C-1
Field Installed Options/Accessories.......................................................................C-1
Maintenance ....................................................................................................Section D
Safety Precautions ................................................................................................D-1
CAPACITOR DISCHARGE PROCEDURE..........................................................................D-1
VISUAL INSPECTION...................................................................................................D-1
ROUTINE MAINTENANCE ............................................................................................D-1
PERIODIC MAINTENANCE ...........................................................................................D-1
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 ......................................................................................................P389 Series

V350-PRO (CE)
A-1
INSTALLATION
A-1
TECHNICAL SPECIFICATIONS - INVERTECV350-PRO (CE)
INPUT AC VOLTAGE & DC OUTPUT
OUTPUT CABLES, CONNECTIONS AND LIMITATIONS
Product Ordering Input AC Rated DC Output Output Weight Dimensions
Name Information Voltage Amps/Volts/Duty Cycle Range with Cord HxWxD
50/60 Hz (continuous)
350A / 34V / 60% 14.7”x12.5”x
Invertec 200-220/ 3 Phase 27.8”*
V350- K1728-3 380-400/ 320A / 33V / 60% AMPS 82.5lbs (373x318x
PRO “CE” 415-440/ 1 Phase 5-425 (37.4 kg) 706*)mm
60/50 Hz
275A / 31V /100%
1 & 3 Phase * Includes
handles
* Overall Length Including Handle, 27.8” (706mm) without handle.
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 CURRENT LENGTH UP 61m (200 FT) 61-76m (200-250 FT)
100% 275 1/0 1/0
60% 350 1/0 2/0
V350-PRO (CE) INPUT CURRENT (CE)
2. When operating on these inputs, the line cord should be changed to an input conductor of 6 AWG or larger.
1. Not rated is indicated by 4-x's in the box on the rating plate
Recommended Fuse Sizes Based On The U.S. National Electrical Code And Maximum Machine Outputs
Input 50/60 Hz Output Recommended
Voltage Phases 275Amps@ 350Amps@ Line Cord Size Fuse Size Notes
31Volts(100%) 34Volts(60%) AWG[IEC] SIZES
200 3 35 48 6 80A Note 2
220 3 35 48 6 80A Note 2
380 3 21 28 8 50A
400 3 20 27 8 50A
415 3 19 26 8 50A
440 3 18 24 8 50A
Voltage Phases 275Amps@ 320Amps@ Line Cord Size Fuse Size Notes
31Volts(100%) 33Volts(60%)
200 1 ---- ---- --- ----- Note 1
220 1 64 82 4 125A Note 2
380 1 44 55 6 80A Note 2
400 1 40 50 8 80A
415 1 38 48 8 80A
440 1 35 45 8 80A

A-2
INSTALLATION
A-2
SELECT SUITABLE LOCATION
The Invertec V350-PRO (CE) will operate in harsh
environments. Even so, it is important that simple pre-
ventative measures are followed in order to assure
long life and reliable operation.
•The machine must be located where there is free cir-
culation 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.
STACKING
V350-PRO (CE) cannot be stacked.
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 (CE). 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
440VAC. If 440VAC is the desired input, then the
machine may be connected to the power system
without any setup required inside the machine.
•Initial 200VAC - 415VAC operation will require an
Input voltage panel setup.
•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.
•Move the "A" lead to the appropriate terminal.
POWER CORD CONNECTION
A 5 meter power cord is wired into the machine.
Follow the power cord connection instructions.
Incorrect connection may result in equipment damage.
SAFETY PRECAUTIONS
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.
•Only qualified personnel should perform this
installation.
•Connect the green/yellow lead of the power
cord to ground per appropriate National
Electrical Code.
----------------------------------------------------------------------
WARNING
Single Phase Input
Connect green/yellow lead to ground per National
Electrical Code.
Connect blue and brown leads to power.
Wrap black lead with tape to provide 600V insulation.
Three Phase Input
Connect green/yellow lead to ground per appropriate
National Electric Code.
Connect blue, black and brown leads to power.
CONNECTIONS OF WIRE FEEDERS TO V350-PRO (CE)
LN-25 Connection Instructions
•Turn the Invertec power switch "off".
•Connect the electrode cable to the output terminal of
polarity required by electrode. Connect the work lead to
the other terminal.
•LN-25 with Remote Control options can be used with the
"CE" version of the V350. The 6 Pin (K444-1) and 14 pin
(K444-2) remotes can be connected directly to the 6 & 14
pin amphenols. The 42 Volt Remote Voltage and Output
Control (K624-1) Kit can be connected to the V350’s
24/42 VAC amphenol using Remote Control Cable
assembly K627- [ ]. LN-25s with a K431-1 remote kit can
be connected to the V350’s 24/42 VAC amphenol 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 V350’s 24/42 VAC amphenol.
LN-7 Connection Instructions
•Turn the Invertec power switch "off".
•Connect the K480 control cable from the LN-7 to the
115VAC 14-pin wire feeder amphenol connector on
the rear of the Invertec.
•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 available, see connection diagram
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 amphenol on the front of the Invertec or
use a K864 adapter to connect the LN-7 and the
remote to the 115VAC 14-pin amphenol connector
on the rear of the Invertec. (See connection diagram
S19901)
WARNING
REMOTEPOWER
OFF
ON
A
AMPS
A
V
VOLTS
WELDTERMINALS
SELECT
OUTPUT
LINCOLN
ELECTRIC
INVERTEC V350-PRO
WARNING
WARNINGAVISODE
PRECAUCION
ATTENTION
!!
!!
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GREEN/YELLOW
BLUE
BLACK
BROWN
V350-PRO (CE)

A-3
INSTALLATION
A-3
V350-PRO (CE)
LN-10 Connection Instructions
•Turn the Invertec power switch "off".
•Connect the K1505 control cable from the LN-10 to
the Invertec 24/42VAC 14-pin amphenol connector
on the rear of the Invertec.
•Connect the electrode cable to the output terminal
of polarity required by the 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.
•See the LN-10 manual for details on accessing
Control DIP Switch
LN-742 Connection Instructions
•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
24/42 VAC 14-pin wire feeder amphenol on the rear
of the Invertec.
•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 volt-
age.
•If a remote control such as K857 is to be used with
the LN-742, the remote can be connected directly to
the 6pin amphenol on the front of the Invertec or use
a K864 adapter to connect the LN-742 and the
remote to the 24/42VAC 14-pin wire feeder amphe-
nol connector on the rear of the Invertec.
Cobramatic Connection Instructions
•Turn the Invertec power switch "off"
•Connect the control cable from the Cobramatic to
the 24/42 VAC 14-pin wire feeder amphenol on the
rear of the Invertec.
•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 6pin amphenol on the front of the
Invertec or use a K864 adapter to connect the
cobramatic and the remote to the 24/42VAC 14-pin
wire feeder amphenol connector on the rear of the
Invertec.
TIG MODULE K930-2
The TIG Module connects to the “CE”version with a
K936-1 (9-14 pin) control cable. Connect the K936-1
to the 115VAC Wire Feeder Amphenol on the rear of
the V350-PRO (CE).
CONNECTION OF WIRE FEEDERS TO V350-PRO (CE)
Wire feeders other than LN-7, LN-10 and LN-25 may
be used provided that the auxiliary power supply
capacity of the Invertec is not exceeded. K867
Universal Adapter Plug may be required. See con-
nection diagram S24985 on page F-4.
REMOTE CONTROL OF INVERTEC
Remote Control K857, Hand Amptrol K963 and Foot
Amptrol K870.
UNDERCARRIAGE MOUNTINGS
5.50
10.00
MOUNTING HOLE LOCATIONS
M19527
1/4-20 NUT (4 PLACES)
NOTE: MOUNTING SCREWS CA
8/00
N NOT PROTRUDE MORE THAN
0.5 INCHES INSIDE THE MACHINE.
11.84
3.50

A-4
INSTALLATION
A-4
V350-PRO (CE)
PARALLEL OPERATION
The V350-PRO (CE) are operable in parallel in CC
mode. For best results, the currents of each machine
should be reasonably well shared. 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, more 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 main-
tain the desired voltage or current. The arc control
pots should be kept identical on the two machines.
QUICK DISCONNECT PLUGS
A quick disconnect system is used for the welding
cable connections. The welding plug included with the
machine is designed to accept a welding cable size of
1/0 to 2/0.
1. Remote 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.
25 mm
1 in.
WELDING CABLE BOOT
TRIM
SET SCREW
BRASS PLUG
COPPER TUBE

B-1
OPERATION
V350-PRO (CE)
B-1
SAFETY PRECAUTIONS
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 danger-
ous.
•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 operator’s manual.
-----------------------------------------------------------
WARNING
GENERAL DESCRIPTION
PRODUCT DESCRIPTION & DUTY CYCLE
The Invertec V350-PRO (CE) offers multi mode CV
and CC DC welding and is rated at 350 amps, 34 volts
at a 60% duty cycle with 3 phase input. It is also rated
at 320 amps with single phase input. It is rated at 275
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), whichever is
greater).
•Prior to CV operation, the meter displays four dash-
es 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" char-
acteristics stated above. The displays blink indicat-
ing that the machine is in the "Hold" period.
2. VOLT METER
•Prior to CV operation (current flow), the meter dis-
plays 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 poten-
tiometer.
•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 con-
trol 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.
STICK = ON
TIG and CV = ON or REMOTE depending if remote
output controls are connected to the machine.

B-2
OPERATION
B-2
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 indicat-
ing 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 con-
trol 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 overrid-
den (switched) with the CONTROL push button.
When changed, the unit will power up in the configura-
tion it was in when it was last powered down.
Hidden Middle Control Panel –Process
Set Up Panel
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
The Mode Control button selects the following welding
modes desired.
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 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".
•The Hot Start control regulates the starting current
at arc initiation. Hot Start can be adjusted from min-
imum (0), with no additional current added at arc
start, to maximum (10), with double the preset cur-
rent 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 recom-
mended setting for Hot Start is 5 where the initial
current is equal to the preset current.
V350-PRO (CE)
OFF
OFF
OF F OF F
OFF
OF F
ON
ON
HO
HO
T ST
T ST
AR
ART
WELD MODE
WELD MODE
ARC CONTR
ARC CONTR
OL
OL
CC-STICK SOFT
CC-STICK SOFT
CC-STICK CRISP
CC-STICK CRISP
TIG GT
TIG GTAW
CV
CV
-WIRE
-WIRE
CV
CV
-FLUX CORED
-FLUX CORED
-4
+4
+4
+2
+2
-2 0
-6
+6
+6
-10
-10
SOFT
SOFT
CRISP
CRISP
+10
+10
-8
+8
+8
5
4
3
2
1
0
6
10
10
9
8
7
SELECT
SELECT
REMO
REMO
TE
TE
ON
ON
REMO
REMO
TE
TE
LOCAL
LOCAL
m
WELD
WELD
TERMINALS
TERMINALS
OUTPUT
OUTPUT
CONTR
CONTROL
SELECT
SELECT
SELECT
SELECT
MPS
MPS
A
OL
OLTS
V
1
6
52
3
4
8
7
11
10
12 9

B-3
OPERATION
B-3
•The Arc Control regulates the relative Slope of the
process. Slope dynamically controls the force the
arc has to penetrate an open root. At the minimum
setting, Arc Control is very soft and is similar to the
Stick Soft mode. At the maximum setting, the slope
is reduced, the OCV is reduced, and the operator
has full control off the arc force required to pene-
trate an open root joint. For vertical down, open root
pipe welding applications, the recommended setting
is between 8 and 10.
•During welding, a boost circuit increases the avail-
able voltage to minimize pop outs. The boost circuit
is independent of the OCV and only operates when
an arc is lit.
TIG GTAW: The TIG mode features continuous con-
trol from 5 to 425 amps. The TIG mode can be run in
either the TIG touch start or high frequency 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 main-
tained 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 set-
tings between 0 and 5 regulate the arc initiation cur-
rent. A setting of 5 results in the most positive arc ini-
tiation. A setting of 0 reduces hot start.
•Hot Start settings between 5 and 10, select high fre-
quency assisted starting TIG mode. In this range, the
OCV of the machine is controlled between 50 and 70
volts. If using the Lincoln K930-1 TIG Module, set
the Hot start to 10 for maximum OCV.
•The Arc Control is not used in the TIG mode.
CV-WIRE: The CV-WIRE mode features continuous
control from 10 to 45 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 mini-
mum setting (-10), minimizes pinch and results in a
soft arc. Low pinch settings are preferable for weld-
ing 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.
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-FLUX
CORED mode.
•The Arc Control regulates pinch effect. At the mini-
mum 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 self-
shielded wires work well at an Arc Control setting of 5.
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 6 for specified
Mode Operation)
LOWER CASE FRONT
The output studs, line switch and remote connector
are located on the lower case front.
9.Both STUDS contain "Twist-Mate" connector
inserts.
•The Negative stud is configured to accept the
pass through gas system.
10.The ON-OFF switch is a 3-phase circuit breaker
rated at 100 amps per leg.
11. The METER POLARITY switch is located above
the output connectors. The switch provides a work
connection for wire feeder voltmeters. Place the
switch in the position of the electrode polarity indi-
cated by the decal. The switch does not change
the welding polarity.
12. 6-PIN AMPENOL for remote control.
REMOTE CONTROL of the OUTPUT CON-
TROL andWELDTERMINALS
The Invertec V350-PRO (CE) has auto sensing of
remote output controls.If after connecting or removing
a remote, the Invertec V350-PRO (CE) did not config-
ured the way you would like the local or remote con-
trol settings can be changed by pushing the OUTPUT
CONTROL or WELD TERMINAL button. (A user can-
not select between the 6 and 14 pin amphenols.)
CV modes
•The remote will default to the 14-pin amphenol
remote if a remote is connected to either of the 14-
pin amphenols and the 6-pin amphenol. Note: Only
one of the 14-pin amphenols can have a remote
control connected at a time. If no remote is connect-
ed to either of the 14-pin amphenols then the
remote will default to the 6-pin amphenol if a remote
is connected to it.
•If a remote control is connected or is not connect-
ed to any of the amphenols the WELD TERMINAL
control will default to REMOTE.
V350-PRO (CE)

B-4
OPERATION
B-4
TIG mode
•The remote will default to the 6-pin amphenol if a
remote control is connected to the 6-pin amphenol
and one of the 14-pin amphenols. If a remote is not
connected to the 6-pin amphenol then the remote
will default to the 14-pin amphenols if a remote is
connected to one of the 14-pin amphenols.
•If a remote control is connected to any of the
amphenols the WELD TERMINAL control will
default to REMOTE. If there are not any remote
control devices attached the WELD TERMINAL con-
trol will default to ON.
CC-Stick modes
•The remote will default to only the 6-pin amphenol 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-PRO (CE)’s 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 Amphenol lead 75 is pin G, lead 76 is pin F
and lead 77 is pin E.
•6-Pin Amphenol 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 machine’s 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 pro-
duce the current that has been set by the Invertec
V350-PRO (CE)’s 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 refer-
enced to earth ground, any auxiliary power from the
Invertec V350-PRO (CE) 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 (CE) to minimum output for the mode that has
been selected while 10 volts supplied to 76 will set
the Invertec V350-PRO (CE) 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-PRO (CE)’s front panel
Output Control.)
Types of Remote WELD TERMINAL Control
•The Invertec V350-PRO (CE)’s Weld Terminals can
be controlled from each of the amphenol connec-
tors. 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
(CE).
•14 Pin Amphenols the Weld Terminals are controlled
from pins C (lead 2) and pin D (lead 4). Pin C is posi-
tive.
•6 Pin Amphenol the Weld Terminals are controlled
from pin D (lead 2) and pin E (lead 4). In the 6-pin
amphenol pin D is positive.
DESIGN FEATURES and ADVANTAGES
•Multiple process DC output range: 5 - 425 amps
•Pre-settable welding outputs.
•Built-in Line Voltage Compensation holds the output
constant over +/- 10% input fluctuations.
•State of the art inverter technology yields high
power efficiency, excellent welding performance,
lightweight, and compact design.
•Utilizes microprocessor control.
•Electronic over current protection.
•Input over voltage protection
•Manual reconnect switch located on the back panel
with a clear reconnect door to allow easy determina-
tion of input configuration. The reconnect door is
fastened with 1/4-turn connectors that allow quick
and easy access to the reconnect area. Circuit
breaker protected auxiliary.
•System Self Configure. The power source analyzes
the remote controls connected to the amphenols
and the desired welding mode to properly determine
the location of trigger and output control.
•Modular options for easy upgrades
•Back lit Status Lights for improved error communi-
cation
•Circuit Breaker Input Switch
•F.A.N. (fan as needed). Cooling fan runs only when
necessary
•Thermostatically protected.
•Designed to the IEC 974-1 Standard.
•IP21S protection rating with potted PC boards for
enhanced ruggedness/reliability.
•Modular construction for easy servicing.
•Aluminum Chassis and Wraparound
•Power Cord included.
V350-PRO (CE)

B-5
OPERATION
B-5
AUXILIARY POWER
•115VAC, 42VAC and 24VAC power is available
from the two 14-pin amphenols on the rear of the
unit. (K1728-2 Construction model of the Invertec
V350-PRO (CE) does not have the amphenols)
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 2.5 amp breaker located by the amphenol.
•42 VAC supply is rated at 5.5 amps and is protected
by a 6 amp breaker located by the amphenol.
•24 VAC supply is rated at 5.5 amps and is protected
by a 6 amp breaker located by the amphenol.
LIMITATIONS
•The V350-PRO (CE) is not recommended for
processes other than those listed.
•The V350-PRO (CE) can only be used with the rec-
ommended equipment and options.
RECOMMENDED PROCESSES
Properly equipped, the Invertec V350-PRO (CE)
supports GMAW, FCAW, SMAW, GTAW and CAC-
A processes for a variety of materials, including
mild steel, stainless steel, cored wires, and alu-
minum
V350-PRO (CE)

C-1
ACCESSORIES
C-1
OPTIONS / ACCESSORIES
"CE" VERSION –K1728-3
•The "CE" version is the Factory version with the
addition of power line filtering allowing the machine
to comply with the European and Australian EMC
emission requirements.
•In this form, the V350-PRO (CE) provides the hard-
ware to power and connect to 24, 42 or 115 VAC wire
feeders.
K857 Remote Output Control
K814 Arc Start Switch
K812 Hand Operated Amptrol
K870 Foot Operated Amptrol
K930-1 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
FIELD INSTALLED OPTIONS/ACCESSORIES
Options for K1728-1 Factory and K1728-3 "CE"
V350’s
•TIG Gas Control Kit –K1762-1
•Advance Process Panel –K1763-1
•Undercarriage –K1764-1
•Valet Style Undercarriage –K1838-1
V350-PR0 (CE)

D-1
MAINTENANCE
D-1
VISUAL INSPECTION
Clean interior of machine with a low pressure air
stream. Make a thorough inspection of all compo-
nents. 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
2. Examine the sheet metal case for dents or breakage.
Repair the case as required. Keep the case in good con-
dition 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.
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.
V350-PRO (CE)
SAFETY PRECAUTIONS
----------------------------------------------------------------------
-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.
------------------------------------------------------------------------
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 operator’s manual and
the Engine manual as well.
-----------------------------------------------------------
WARNING
CAPACITOR DISCHARGE PROCEDURE
1. Obtain a power resistor (25 ohms, 25 watts).
2. Hold resistor body with electrically insulated glove.
DO NOT TOUCH TERMINALS. Connect the resis-
tor terminals across the two studs in the position
shown. Hold in each position for 1 second. Repeat
for all four capacitors.
3. Use a DC voltmeter to check that voltage is not
present across the terminals on all four capacitors.
CAPACITOR
TERMINALS
RESISTOR