Lincoln Electric Red-D-Arc EX350i User manual

RED-D-ARC
EX350i
IM764
March, 2002
Red-D-Arc Spec-Built Welding Equipment
This RED-D-ARC welder is built to RED-D-ARC Extreme Duty
design specifications by Lincoln Electric.
Safety Depends on You
This welder 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, 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.
For use with machines having Code Numbers: 10945
North America’s Largest Fleet of Welding Equipment
1-800-245-3660
OPERATOR’S MANUAL

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
products.
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 sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suiv-
antes:
Sûreté Pour Soudage A L’Arc
1. Protegez-vous contre la secousse électrique:
a. Les circuits à l’électrode 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 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 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 l’eau 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 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 à proximité au
soudage à l’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 sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où l’on pique le laitier.
6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.
7. Quand on ne soude pas, poser la pince à une endroit isolé de
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 à la terre le chassis du poste conformement au code de
l’électricité 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, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.
3. Avant de faires des travaux à l’interieur de poste, la debranch-
er à l’interrupteur à la boite de fusibles.
4. Garder tous les couvercles et dispositifs de sûreté à leur
place.
Mar. ‘93

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.
vv

vi
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 EX350i ..........................................................A-2
Remote Control of Invertec .............................................................................A-3
Undercarriage Mountings................................................................................A-3
Parallel Operations..........................................................................................A-4
________________________________________________________________________
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 ...................................................................B-2 thru 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
Field Installed Options...........................................................................................C-1
Quick Disconnect Plugs.........................................................................................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
________________________________________________________________________
Troubleshooting ..............................................................................................Section E
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 ......................................................................................................P439 Series
________________________________________________________________________

EX350i
A-1
INSTALLATION
A-1
TECHNICAL SPECIFICATIONS - RED-D-ARC EX350i
INPUT AC VOLTAGE & DC OUTPUT
Product Ordering Input AC Rated DC Output Output Weight Dimensions Open
Name Information Voltage Amps/Volt Range with Cord HxWxD Circuit
/Duty Cycle (continuous) Voltage
200
208-230/ 14.8” x 13.3” x
380-400/ 350A / 34V / 60% (373 x 338 x
415-460/ AMPS (84.0 lbs) 27.8”*
EX350i K1728-2 575 5-425 (38.0 kg.) (373 x 338 x 80 VDC
1& 3 Phase 300A / 32V /100% 706*)mm
60/50 Hz
* Overall Length Including Handle, 27.8” (706mm)
Voltage
200
208
230
380
400
415
460
575
200
208
230
380
400
415
460
575
Phases
1
1
1
1
1
1
1
1
3
3
3
3
3
3
3
3
300Amps @
32Volts(100%)
Not
Recommended
76
69
Not
Recommended
Not
Recommended
41
36
31
41
39
36
23
22
22
19
16
350Amps @
34Volts(60%)
Not
Recommended
94
85
Not
Recommended
Not
Recommended
64
42
37
50
50
42
28
27
26
23
18
Line Cord
AWG
2
4
---
6
8
8
8
6
8
8
8
8
8
8
Fuse size
---
125A
125A
---
---
80A
70A
50A
80A
80A
70A
50A
50A
50A
50A
35A
EX350i INPUT CURRENT
OUTPUT CABLES, CONNECTIONS AND LIMITATIONS
Recommended Fuse Sizes Base On The U.S. National Electrical Code And Maximum Machine Outputs
Input 50/60 Hz Output Recommended
Note 1. Not rated is indicated by 4-x’s 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.
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
200-250 FT. (61-76m)
1/0
2/0
Notes
Note 1
Note 2
Note 2
Note 1
Note 1
Note 2
Note 2
Note 2

A-2
INSTALLATION
A-2
SELECT SUITABLE LOCATION
The Invertec EX350i will operate in harsh environ-
ments. Even so, it is important that simple preventa-
tive 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.
• 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
EX350i 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 EX350i. 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 opera-
tion will require an Input voltage panel setup.
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 U.S.National Electrical
Code.
----------------------------------------------------------------------
WARNING
• 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 25 ft. power cord is provided and wired into the
machine. Follow the power cord connection instruc-
tions.
• Incorrect connection may result in equipment
damage.
-----------------------------------------------------------------------
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 leads to power.
CONNECTIONS OF WIRE FEEDERS TO EX350I
LN-25 Connection Instructions
-Not recommended for Pulse Welding with the
Advanced Process Kit ).
• Turn the EX350i 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 EX350i. The 14 pin (K444-2) remote can be con-
nected directly to the 14 pin amphenol. The 42 Volt
Remote Voltage and Output Control (K624-1) Kit can
be connected to the EX350i 24/42 VAC amphenol
using Remote Control Cable assembly K627- [ ]. LN-
25s with a K431-1 remote kit can be connected to
the 24/42 VAC amphenol using a K432 cable and a
K876 adapter. (See connection diagram S19899) to
connect it to one of the 14-pin amphenols. Or the
K432 cable could be modified with a K867 Universal
Adapter Plug (See connection diagram S19405) to
connect it to the 24/42 VAC 14-pin amphenol.
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
RED
BLACK
WHITE or BROWN
EX350i
CAUTION
CAUTION

A-3
INSTALLATION
A-3
LN-7 Connection Instructions
•Turn the EX350i power switch “off”.
•Connect the K480 control cable from the LN-7 to
the EX350i 115 VAC control cable connector.The
control cable connector is located at the front of the
EX350i.
•Connect the electrode cable to the output terminal
of polarity required by electrode. Connect the work
lead to the other terminal
•Set the meter polarity switch on the front of the
EX350i to coincide with wire feeder polarity used.
The wire feeder will now display the welding volt-
age.
•If K480 is not available, see connection diagram
S19404 for modification of K291 or K404 LN-7 input
cable with K867 universal adapter plug.
LN-10 Connection Instructions
•Turn the EX350i power switch "off"
•Connect the K1505 control cable from the LN-10 to the
EX350i 24/42VAC 14-pin amphenol connector on the
front of the EX350i.
•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 EX350i 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
EX350i power switch "off"
•Either a K591 or a K593 Input cable assembly is
required to connect the LN-742 to the EX350i .
•Connect the control cable from the LN-742 to the
24/42 VAC 14-pin wire feeder amphenol on the
front of the EX350i .
•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
EX350i to coincide with wire feeder polarity used.
The wire feeder will now display the welding volt-
age.
•If a remote control is to be used with the LN-742,
use a K864 adapter to connect the feeder and a
K857 remote to the 14-pin wire feeder connector on
the front of the
EX350i .
Cobramatic Connection Instructions
•Turn the EX350i power switch "off"
•Connect the control cable from the Cobramatic to
the 24/42 VAC 14-pin wire feeder amphenol on the
front of the EX350i .
•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
EX350i to coincide with wire feeder polarity used.
•If a remote control is to be used with the
Cobramatic, or use a K864 adapter to connect the
cobramatic and a K857 remote to the 24/42VAC
14-pin wire feeder amphenol connector on the front
of the EX350i.
TIG Module K930-2
The TIG Module connects to the EX350i with a K936-
1 (9-14 pin) control cable. Connect the K936-1 to the
115VAC wire feeder amphenol on the front of the
EX350i.
General Instructions for Connection of Wire
Feeders to EX350i
Wire feeders other than LN-7 and LN-25 may be used
provided that the auxiliary power supply capacity of
the EX350i 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
5.50
10.00
MOUNTING HOLE LOCATIONS
1/4-20 NUT (4 PLACES)
NOTE: MOUNTING SC EWS CANNOT P OT UDE MO E THAN 0.5 INCHES INSIDE THE MACHINE.
3.50
11.84
EX350i

A-4
INSTALLATION
A-4
EX350i
PARALLEL OPERATION
The EX350i 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 require-
ments 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.

B-1
OPERATION
EX350i
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
The Invertec EX350i offers multi-process CV, CC, and
DC welding and is rated 350 amps, 34 volts at a 60%
duty cycle.
DUTY CYCLE
The EX350i 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), 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
CV = REMOTE
TIG = REMOTE if remote output controls 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.

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 indicating that the out-
put 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 tempera-
ture 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 sys-
tem.
•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
(switched) with the CONTROL push button. 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
7. WELD MODE SELECT -
The Mode Control button selects from the following
welding modes.
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.
•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.
EX350i
REMO
REMO
TE
ON
ON
REMO
REMO
TE
LOCAL
LOCAL
WELD TERMINALS
OUTPUT
CONTROL
SELECT SELECT
MPS
AOLTS
V
SELECT
SELECT
CC-STICK SOFT 7018
CC-STICK SOFT 7018
CC-STICK CRISP 6010
CC-STICK CRISP 6010
TIG GT
TIG GT
AW
CV
CV
-WIRE
-WIRE
CV
CV
-FLUX CORED
-FLUX CORED
HO
HO
T ST
T ST
ART ARC CONTR
ARC CONTR
OL
OL
-4 +4
+2
-2 0
-6 +6
-10
SOFT CRISP
+10
-8 +8
5
4
3
2
1
0
6
10
9
8
7
1
6
5
2
3
4
8
7
11
10
12 9
FIGURE 1

B-3
OPERATION
B-3
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 (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 main-
tained at 25 amps independent of the preset cur-
rent.
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
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.
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 sole-
noid 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 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.
EX350i
•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.

B-4
OPERATION
B-4
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 loca-
tions M1 thru M8.
Modes:
In addition to the 5 welding modes described in SEC-
TION 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.
EX350i
•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
will 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.
Pulse Mode features 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
MEMORY
MEMORY BUTTON
(M1 THRU M8)
OUTPUT KNOB
SELECT BUTTON
(HOT START OR ARC CONTROL)
ADJUST KNOB
(0 THRU 10-HOT START)
(-10 THRU 0 AND
0 THRU +10-ARC CONTROL)
SELECT KNOB
(SCOLLS WELDING PROCESSES)
SELECT ADJUST
SELECT
7A
ADVANCE PROCESS PANEL VERSION
REMOTE
ON
REMOTE
LOCAL
WELD TERMINALS
OUTPUT
CONTROL
SELECT SELECT
MPS
AOLTS
V
FIGURE 2

B-5
OPERATION
B-5
EX350i
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.
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 ### <
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.
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 memo-
ry 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.
8. Adjust the output control to the correct wire feed
setting and the EX350i 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 EX350i 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 origi-
nal settings in M1.
Note: After all memory’s 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.

B-6
OPERATION
B-6
WELD MODE DETAILS:
EX350i
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 applica-
tions.
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.
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 reg-
ulated only when an arc is present. During shorting, the output is
allowed to increase to clear the short.

B-7
OPERATION
B-7
PULSE PROGRAMS:
EX350i
MODE IMP*
.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
.035 Nickel Alloys (Non Adaptive) 80 - 700
.045 Nickel Alloys (Non Adaptive) 75 - 550
COMMENTS
The EX350i pulse programs are non-synergic and allow indepen-
dent control of the wire feed speed and the arc length. The Output
Control Knob on the EX350i, 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 appli-
cation, the "SPD" value can be adjusted to obtain the desired arc
length.
The "SPD" value displayed on the EX350i may not match the
actual wire feed speed!
The operation of the Arc Control knob on the EX350i 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%.
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 consid-
ering the nature of nickel alloys.
Preferred gas: Argon/Helium Blends = for the best results add
helium to the argon base from 0-25%.
.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
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.
PULSE ON PULSE
*IPM (INCHES PER MINUTE)

B-8
OPERATION
B-8
EX350i
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 dis-
plays 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 speci-
fied 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 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. 3-PIN AMPENOL for remote control.
REMOTE CONTROL of the OUTPUT CONTROL and
WELD TERMINALS
The EX350i has auto sensing of remote output con-
trols.If after connecting or removing a remote, the
EX350i is not configured the way you would like the
local or remote control settings can be changed by
pushing the OUTPUT CONTROL or WELD TERMI-
NAL button. (A user cannot select between the 3 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 3-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 3-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.
TIG mode
•The remote will default to the 3-pin amphenol if a
remote control is connected to the 3-pin amphenol
and one of the 14-pin amphenols. If a remote is not
connected to the 3-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 3-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 EX350i’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.
•3-pin Amphenol lead 75 is pin A, lead 76 is pin B
and lead 77 is pin C.
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 EX350i’s
front panel Output Control.)
Voltage Control
•The supply should be an isolated supply. (Not refer-
enced to earth ground, any auxiliary power from the
EX350i or the welding output) The supply should be
capable of supplying at least 20mA.
•0 volts supplied to 76 will set the EX350i to mini-
mum output for the mode that has been selected
while 10 volts supplied to 76 will set the EX350i 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 EX350i’s front
panel Output Control.)
Types of Remote WELD TERMINAL Control
•The EX350i’s Weld Terminals can be controlled
from each of the 14 pin amphenol 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 EX350i.
•14 Pin Amphenols the Weld Terminals are controlled
from pins C (lead 2) and pin D (lead 4). Pin C is posi-
tive.

B-9
OPERATION
B-9
EX350i
AUXILIARY POWER
•115VAC, 42VAC and 24VAC power is available
from the two 14-pin amphenols on the rear of the
unit. 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 EX350i is not recommended for processes
other than those listed.
•The EX350i can only be used with the recommend-
ed equipment and options.
RECOMMENDED PROCESSES
Properly equipped, the EX350i supports GMAW,
FCAW, SMAW, GMAW-P, GTAW and CAC-A
processes for a variety of materials, including mild
steel, stainless steel, cored wires, and aluminum.