SVM158-A
April, 2002
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be
increased by proper installation
. . . and thoughtful operation on
your part. DO NOT INSTALL,
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.
SERVICE MANUAL
For use with machine code numbers 10873, 10874, 10876
INVERTEC V350-PRO
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Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
View Safety Info View Safety Info View Safety Info View Safety Info
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
• World's Leader in Welding and Cutting Products •
Copyright © 2002 Lincoln Global Inc.
RETURN TO MAIN INDEX
A
AMPS
V
VOLTS
A
CC-STICK 7018
CC-STICK 6010
TIG GTAW
CV-WIRE
CV-FLUX CORED
WARNING
OUTPUT
WELD TERMINALS
HOT START
SELECT
4
5
3
SELECT
6
ARC CONTROL
2
7
1
-2
0
8
-4 +4
0
REMOTE
+2
-6 +6
9
10
-8
-10
SOFT
+8
+10
CRISP
POWER
ON
OFF
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Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
i
SAFETY
i
FOR ENGINE
powered equipment.
1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.
____________________________________________________
1.b.Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.
____________________________________________________
1.c. Do not 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 vaporizing 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.
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. AFree 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 cancer, 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
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
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
SAFETY
iii iii
V350-PRO
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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, VA22202.
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 circuits.
This can create fire hazards or overheat lifting chains or
cables until they fail.
6.h. Also see item 1.c.
SAFETY
iv iv
V350-PRO
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PRÉCAUTIONS DE SÛRETÉ
Pour votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suivantes:
Sûreté Pour Soudage A 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 rayonnement 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, pantalons sans revers, et chaussures montantes.
5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où 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 levage,
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 debrancher à l’interrupteur à la boite de fusibles.
4. Garder tous les couvercles et dispositifs de sûreté à leur place.
Mar. ‘93
MASTER TABLE OF CONTENTS FOR ALL SECTIONS
v v
V350-PRO
Page
Safety.................................................................................................................................................i-iv
Installation .............................................................................................................................Section A
Operation...............................................................................................................................Section B
Accessories...........................................................................................................................Section C
Maintenance .........................................................................................................................Section D
Theory of Operation .............................................................................................................Section E
Troubleshooting and Repair.................................................................................................Section F
How to Use Troubleshooting Guide............................................................................................F-2
Troubleshooting Guide................................................................................................................F-4
Test Procedures ........................................................................................................................F-15
Replacement Procedures .........................................................................................................F-51
Electrical Diagrams..............................................................................................................Section G
Parts Manual ....................................................................................................................P-401 Series
RETURN TO MAIN INDEX
SectionA-1 Section A-1
V350-PRO
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TABLE OF CONTENTS
- INSTALLATION SECTION -
Installation
Technical Specifications .............................................................................................................A-2
Safety Precautions......................................................................................................................A-3
Stacking......................................................................................................................................A-3
Tilting ..........................................................................................................................................A-3
Input Grounding Connections ....................................................................................................A-3
Power Cord Connection .............................................................................................................A-3
Connection of Wire Feeders................................................................................................A-3/A-4
Cobramatic Connection Instructions..........................................................................................A-4
Parallel Operation .......................................................................................................................A-5
V350-PRO
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Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
A-2
INSTALLATION
A-2
TECHNICAL SPECIFICATIONS -
INVERTEC V350-PRO
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
K1728-5 Construction
Construction (81.0 lbs.)
200 350A / 34V / 60% (36.7 kg.) 14.8” x 13.3” x
Invertec K1728-6 208-230/ 27.8”*
V350- Factory 380-400/ AMPS Factory (373 x 338 x
PRO 415-460/ 5-425 (81.0 lbs.) 706*)mm
60/50 Hz
K1728-7 575 300A / 32V /100% (36.7 kg.) 80 VDC
Advanced 1& 3 Phase
Process 60/50 Hz Advanced Process
(81.5 lbs.)
(37.0 kg.)
* 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
V350-PRO INPUT CURRENT
OUTPUT CABLES, CONNECTIONS AND LIMITATIONS
Recommemded 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-3 A-3
V350-PRO
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INSTALLATION
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
SAFETY PRECAUTIONS
SELECT SUITABLE LOCATION
The Invertec V350-PRO will operate in harsh environments. Even so, it is important that simple preventative
measures are followed in order to assure long life and
reliable operation.
• The machine must be located where there is free circulation of clean air such that air movement in the
back, out the sides and bottom will not be restricted.
• Dirt and dust that can be drawn into the machine
should be kept to a minimum. Failure to observe
these precautions can result in excessive operating
temperatures and nuisance shutdown.
• Keep machine dry. Shelter from rain and snow. Do
not place on wet ground or in puddles.
• DO NOT MOUNT OVER COMBUSTIBLE SURFACES.
Where there is a combustible surface directly under
stationary or fixed electrical equipment, that surface
shall be covered with a steel plate at least .06”(1.6mm)
thick, which shall extend not less than 5.90”(150mm)
beyond the equipment on all sides.
STACKING
V350-PRO cannot
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. 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 460V AC is the desired input, then the machine may
be connected to the power system without any setup
required inside the machine.
CAUTION
• Initial 200VAC - 415V AC and 575VAC 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
380-575.
• Move the "A" lead to the appropriate terminal.
POWER CORD CONNECTION
A 10 ft. power cord is provided and wired into the
machine. Follow the power cord connection instructions.
•Incorrect connection may result in equipment
damage.
-----------------------------------------------------------------------
Single Phase Input
Connect green lead to ground per National Electrical
Code.
Connect black and white 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 V350-PRO
LN-25 Connection Instructions
(Factory, Construction & Advanced Process versions
can be connected.-Not recommended for Pulse
Welding with the Advanced Process Model).
• 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
Factory Advanced Process version of the V350. The 6-Pin
(K444-1) and 14-pin (K444-2) remotes can be connected
directly to the 6-pin & 14-pin MS-style connectors. The 42
Volt Remote Voltage and Output Control (K624-1) Kit can
be connected to the V350’s 14-pin MS-style connector
using Remote Control Cable assembly K627- [ ]. LN-25s
with a K431-1 remote kit can be connected to the V350’s
14-pin MS-style connector using a K432 cable and K876
adapter. (See connection diagram S19899). Or the K432
cable could be modified with a K867 Universal Adapter
Plug (See connection diagram S19405) to connect it to the
V350’s 14-pin MS-style connector.
WARNING
REMOTE
POWER
OFF
ON
A
AMPS
A
V
VOLTS
WELD TERMINALS
SELECT
OUTPUT
LINCOLN
ELECTRIC
INVERTEC V35 0-PRO
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GREEN
RED
BLACK
WHITE OR BROWN
CAUTION
INSTALLATION
A-4 A-4
V350-PRO
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
LN-7 Connection Instructions
An LN-7 can only be used with the “Factory” &
“Advanced Process” versions of the 350-Pro.
• Turn the Invertec power switch "off".
• Connect the K480 control cable from the LN-7 to the
14-pin MS-style connector.
• Connect the electrode cable to the output terminal of the
polarity required by electrode. Connect the work lead to
the other terminal.
• Set the meter polarity switch on the front of the Invertec
to coincide with wire feeder polarity used. The wire
feeder will now display the welding voltage.
• If K480 is not 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
MS-style connector on the front of the Invertec or use a
K864 adapter to connect the LN-7 and the remote to the
14-pin MS-style connector. (See connection diagram
S19901)
LN-10 Connection Instructions
An LN-10 can only be used with the “Factory” &
“Advanced Process” versions of the 350-Pro.
• Turn the Invertec power switch "off"
• Connect the K1505 control cable from the LN-10 to the
14-pin MS-style connector.
• 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
An LN-742 can only be used with the “Factory” &
“Advanced Process” versions of the 350-Pro.
• Turn the Invertec power switch "off"
• Either a K591 or a K593 Input cable assembly is
required to connect the LN-742 to the Invertec.
• Connect the control cable from the LN-742 to the
14-pin MS-style connector.
• Connect the electrode cable to the output terminal
of the polarity required by electrode. Connect the
work lead to the other terminal.
• Set the meter polarity switch on the front of the
Invertec to coincide with wire feeder polarity used.
The wire feeder will now display the welding voltage.
• If a remote control such as K857 is to be used with the
LN-742, the remote can be connected directly to the 6-pin
MS-style connector on the front of the Invertec or use a
K864 adapter to connect the LN-742 and the remote to
the 14-pin MS-style connector.
Cobramatic Connection Instructions
A Cobramatic can only be used with the “Factory” &
“Advanced Process” versions of the 350-Pro.
• Turn the Invertec power switch "off"
• Connect the control cable from the Cobramatic to
the 14-pin MS-style connector.
• Connect the electrode cable to the output terminal
of the polarity required by electrode. Connect the
work lead to the other terminal.
• Set the meter polarity switch on the front of the
Invertec to coincide with wire feeder polarity used.
• If a remote control such as K857 is to be used with
the Cobramatic, the remote can be connected
directly to the 6-pin MS-style connector on the front
of the Invertec or use a K864 adapter to connect
the cobramatic and the remote to the 14-pin MSstyle connector.
TIG Module K930-2
The TIG Module connects to the Factory and Advanced
Process
V350-Pro versions with a K936-1 (9-14 pin)
control cable. Connect the K936-1 to the MS-style
connector.
The TIG Module can also be used with the V350-Pro
Construction version. A K936-4 control cable is
required to supply 115VAC to the TIG Module from an
external 115VAC supply.
General Instructions for Connection of Wire
Feeders to V350-Pro
Wire feeders other than those listed above may be
used provided that the auxiliary power supply rating of
the V350-Pro is not exceeded. K867 universal adapter
plug is required. See connection diagram S24985 on
page F-4.
REMOTE CONTROL OF INVERTEC
Remote Control K857, Hand Amptrol K963 and Foot
Amptrol K870.
UNDERCARRIAGE MOUNTINGS
NOTE: MOUNTING SCREWS CA
MOUNTING HOLE LOCATIONS
CHES INSIDE THE MACHINE.
0.5 IN
11.8
4
N NOT PROTR
3.50
1/4-20 NUT (4 PLACES)
10.00
UDE MORE THAN
M19527
5.50
4/01
INSTALLATION
A-5 A-5
V350-PRO
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
PARALLEL OPERATION
The V350-Pro can be paralleled 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 maintain the desired current. The arc control pots should
be kept identical on the two machines.
NOTES
A-6 A-6
V350-PRO
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
Section B-1 Section B-1
V350-PRO
TABLE OF CONTENTS
- OPERATION SECTION -
Operation...............................................................................................................................Section B
Safety Precautions......................................................................................................................B-2
General Description..............................................................................................................B-2
Duty Cycle ............................................................................................................................B-2
Operational Features and Controls ............................................................................................B-2
Weld Mode Select.......................................................................................................................B-3
CC-Stick Soft..................................................................................................................B-3
CC-Stick Crisp................................................................................................................B-3
TIG GTAW .......................................................................................................................B-4
CV-Wire ...........................................................................................................................B-4
CV-Innersheild.................................................................................................................B-4
Advanced Process Panel............................................................................................................B-5
Controls ......................................................................................................................................B-6
Electrode Material.......................................................................................................................B-6
Hot Start & Arc Control...............................................................................................................B-6
Weld Mode Details......................................................................................................................B-7
Pulse Programs ..........................................................................................................................B-8
Lower Case Front .......................................................................................................................B-9
CV Modes.............................................................................................................................B-9
TIG Mode .............................................................................................................................B-9
CC-Stick Modes...................................................................................................................B-9
Types of Remote Output Control................................................................................................B-9
Types of Remote Weld Terminal Control ....................................................................................B-9
Auxiliary Power .........................................................................................................................B-10
Limitations.................................................................................................................................B-10
Recommended Processes........................................................................................................B-10
Descriptions of Special Welding Processes Available on this Machine...................................B-11
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Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
B-2
B-2
V350-PRO
OPERATION
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground.
• Always wear dry insulating gloves.
------------------------------------------------------------------------
FUMES AND GASES can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
------------------------------------------------------------------------
WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
• Do not weld on closed containers.
------------------------------------------------------------------------
ARC RAYS can burn eyes and skin.
• Wear eye, ear and body
protection.
------------------------------------------------------------
See additional warning information at
front of this operators manual.
-----------------------------------------------------------
WARNING
SAFETY PRECAUTIONS
GENERAL DESCRIPTION
The Invertec V350-Pro offers multi-process CV, CC,
and DC welding and is rated 350 amps, 34 volts at a
60% duty cycle. The V350-Pro is available in either a
Construction version (no wire feeder connection and
auxiliary power) and a Factory & Advanced Process
versions (includes wire feeder connection and related
power)
.
• The factory model is the construction model with
the addition of the Wire Feeder/Remote Adapter.
• In this form, the V350-Pro provides the hardware to
power and connect to 24, 42 or 115 VAC wire feeders.
• The advanced process model is the factory model
with an advanced process panel installed in place of
the standard mode panel. In this form, the V350-Pro
provides access to the 5 standard weld modes (Stick
Soft, Stick Crisp, TIG, CV-Wire, CV-Innershield),
gouge, constant power and pulse MIG weld modes.
DUTY CYCLE
The V350-Pro is rated at 350 amps, 60% duty cycle
(based on a 10 minute cycle). It is also rated at 300
amps, 100% duty cycle.
OPERATIONAL FEATURES and CONTROLS:
UPPER CONTROL PANEL
1. AMPS Meter
• Prior to STICK or TIG operation (current flow), the
meter displays preset current value (+/- 2 amps or
+/- 3%, whichever is greater).
• Prior to CV operation, the meter displays four dashes indicating non-presettable AMPS.
• During welding, this meter displays actual average
amps.
• After welding, the meter holds the actual current
value for 5 seconds. Output adjustment while in the
"hold" period results in the "prior to operation" characteristics stated above. The displays blink indicating that the machine is in the "Hold" period.
2. VOLT METER
• Prior to CV operation (current flow), the meter displays desired preset voltage value (+/- .5V).
• Prior to STICK or TIG operation, the meter displays
the Open Circuit Voltage of the Power Source or four
dashes if the output has not been turned on.
• During welding, this meter displays actual average
volts.
• After welding, the meter holds the actual voltage
value for 5 seconds. The displays blink indicating
that the machine is in the "Hold" period.
• Output adjustment while in the "hold" period results
in the "prior to operation" characteristics stated
above.
3. OUTPUT CONTROL
• Output control is conducted via a single turn potentiometer.
• Adjustment is indicated by the meters as stated
above.
• When in TIG modes, this control sets the maximum
welding current. Full depression of a foot or hand
Amptrol results in the preset level of current.
4. WELD TERMINALS-REMOTE / ON
• Two status lights indicate the location of trigger control as determined by the "WELD TERMINALS" push
button.
• If trigger control is local "weld terminals on", the ON
display will be lit.
• If trigger control is remote "weld terminals remotely
controlled", the REMOTE display will be lit.
OPERATION
B-3 B-3
V350-PRO
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• 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.
5. THERMAL
• This status light indicates when the power source has been
driven into thermal overload. If the output terminals were
"ON", the "ON" light will blink indicating that the output will
be turned back on once the unit cools down to an acceptable temperature level. If the unit was operating in the
"REMOTE" mode, the trigger will need to be opened
before or after the thermal has cleared and closed after the
machine has cooled down to an acceptable temperature to
establish output.
6. CONTROL-REMOTE / LOCAL
• Two status lights indicate the location of output control as
pre-determined by the power sources auto-configure system.
• The LOCAL display will be lit when control is at the power
source.
• The REMOTE display will be lit when a remote pot/control
is detected.
These Output Control configurations can be overridden
(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.
7. WELD MODE SELECT - FACTORY AND
CONSTRUCTION (See Figure B.1)
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 minimum (0), with no additional current added at arc
start, to maximum (10), with double the preset current or 425 amps (max of machine) added for the
first second after arc initiation.
• The Arc Control regulates the Arc Force to adjust
the short circuit current. The minimum setting (-10)
will produce a "soft" arc and will produce minimal
spatter. The maximum setting (+10) will produce a
"crisp" arc and will minimize electrode sticking.
CC-STICK CRISP:The Stick Crisp mode features continuous control from 5 to 425 amps. This mode was
intended primarily for pipe welding applications.
• The Hot Start control regulates the starting current at
arc initiation. Hot Start can adjust starting current up
or down by 25% of the preset value. The recommended setting for Hot Start is 5 where the initial current is equal to the preset current.
REMOTETE
ON
REMOTETE
LOCAL
SELECT
CC-STICK SOFT 7018
CC-STICK CRISP 6010
TIG GT
CV
-WIRE
-FLUX CORED
T STARAR
ARC CONTROLOL
1
6
5
2
3
4
8
7
11
10
12
9
FIGURE B.1.
Hidden Middle Control Panel – Mode Panel
A
MPS
CONTROL
REMO
LOCAL
SELECT SELECT
CC-STICK SOFT 7018
CC-STICK CRISP 6010
TIG GT
AW
CV
-WIRE
CVCV-FLUX CORED
SELECT
OUTPUT
4
3
2
1
HOHOT ST
5
0
OLTS
V
WELD TERMINALS
REMO
ON
T ARC CONTR
6
7
-6 +6
8
9
-8
10
0
-2
-4 +4
-10
SOFT CRISP
+2
+8
+10
OPERATION
B-4 B-4
V350-PRO
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• The Arc Control regulates the Arc Force to adjust the
short circuit current. The minimum setting (-10) will
produce a "soft" arc and will produce minimal spatter. The maximum setting (+10) will produce a "crisp"
arc and will minimize electrode sticking.
TIG GT AW: The TIG mode features continuous control
from 5 to 425 amps. The TIG mode can be run in either
the TIG touch start or high frequency (optional equipment required) assisted start mode.
• The Hot Start control selects the starting mode
desired. A setting of less than 5, the TIG lift start
mode is selected. The OCV is controlled below 10v
and the short circuit "TIG touch" current is maintained at 25 amps independent of the preset current.
When the tungsten is lifted, an arc is initiated and
the output is regulated at the preset value. Hot start
settings between 0 and 5 regulate the arc initiation
current. Asetting of 5 results in the most positive arc
initiation. Asetting 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 the V350 is in the
TIG mode. If the Weld Terminals are in “Remote” then
the solenoid will open when the arc start switch is
closed. The solenoid will close after the arc switch has
been opened and the post flow time expired.
If the Weld Terminals are turned “ON”, then the solenoid will open when the electrode is touched to the
work. The electrode needs to remain in contact with
the work to allow for gas coverage before attempting to
start the arc. The solenoid will close after the arc has
been broken and the post flow time expired.
CV-WIRE: The CV-WIRE mode features continuous
control from 10 to 40 volts. The mode was intended for
most GMAW, FCAW, and MCAW applications.
• The Hot Start control is not used in the CV-WIRE
mode.
• The Arc Control regulates pinch effect. At the minimum setting (-10), minimizes pinch and results in a
soft arc. Low pinch settings are preferable for welding with gas mixes containing mostly inert gases. At
the maximum setting (+10), maximizes pinch effect
and results in a crisp arc. High pinch settings are
preferable for welding FCAW and GMAW with CO2.
CV-INNERSHEILD: The CV-INNERSHEILD 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 active in the CV-FLUX
CORED mode.
• The Arc Control regulates pinch effect. At the minimum setting (-10), minimizes pinch and results in a
soft arc. At the maximum setting (+10), maximizes
pinch effect and results in a crisp arc. Most selfshielded wires work well at an Arc Control setting of 5.
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OPERATION
B-5 B-5
V350-PRO
7A. ADVANCED PROCESS PANEL
(See Figure B.2)
To program Welding modes. SELECT knob is used to
Scroll through all Welding modes. The MEMORY but-
ton is used to store and access Welding modes into
locations M1 thru M8.
Modes:
In addition to the 5 welding modes described in SECTION 7, the Advanced Process Panel allows you to
select the Following additional modes.
• 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. Refer to the detailed explanation at the end of this section.
• 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.
• 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
Refer to the detailed explanation at the end of this
section.
MEMOR
(M1
ON
ADJUST KNOB
WELDING PR
REMOTETE
ON
REMOTETE
LOCAL
FIGURE B.2
ADVANCED PROCESS PANEL VERSION
SELECT KNOB
(SCOLLS WELDING PR
MEMOR
THRU M8)
(M1
Y BUTTON
OCESSES)
OUTPUT KNOB
A
MPS
CONTROL
REMO
LOCAL
SELECT SELECT
MEMORY
SELECT
SELECT
OUTPUT
OLTS
V
WELD TERMINALS
REMO
ON
ADJUST
7A
ADJUST KNOB
(0 THRU 10-HOT START)
(-10 THRU 0 AND
0 THRU +10-ARC CONTROL)
SELECT BUTTON
(HOT START OR ARC CONTROL)
OPERATION
B-6 B-6
V350-PRO
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CONTROLS: (See Figure B.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.
LEFT WINDOW RIGHT 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 what
memory to save in, lets say M1. To store in M1 push
the Memory button again to save the Pulse Mig
mode to memory M1.
6. The display in the digital windows will read as follows:
M1 Pulse MIG Argon Blends
Steel .035 Arc Cntrl 1.2
7. Saving or entering a second welding mode to a
memory, M2. Turn the Select knob until the desired
welding process mode is displayed in right digital
window. Then follow steps 1 thru 6.
Press the Memory button till the digital window
reads,
Save to MEM
M2
Press the Memory button again and the New
Welding process is saved in M2.
8. Adjust the output control to the correct wire feed setting and the V350-PRO is ready to weld again.
(Note: The wire feed speed setting is not stored in
memory and will need to be reset.)
9. Adjust the Arc Control and note that the M1 goes
away indicating that the V350-PRO settings no
longer match what is stored in memory. Going back
to the original settings will not bring the M1 back.
You will need to push the Memory button to recall
the original settings in M1.
Note: After all 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.
LN-10/DH-10 Wire Feeder Compatibility Note:
The LN-10 and DH-10 feeders can be used to pulse
weld and in the power mode with the panel. The displays on the LN-10 & DH-10 do not show the wire feed
speed or power.
8. HOT START and ARC CONTROL features
have different functions depending on the welding
Mode that is active. Each feature is described under
the welding mode heading. (See Item 7 or 7.A for
specified Mode Operations) (See Figure B.1 or B.2)
B-7 B-7
V350-PRO
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WELD MODE DETAILS:
Mode Range Comments
Stick Soft 5 - 425 amps The stick soft mode is the best selection for general stick
applications.
Arc Control = Arc Force
Hot Start = Initial hot start current (min = start a match set amps, Max.
= greatest hot start current) During hot start, arc force is set
at high and is fast response.
For gouging applications: Turn current up to 425 amps.
Stick Crisp 5 - 425 amps The stick crisp mode features an aggressive arc force routine well suit-
ed for Exx10, Exx11 series electrodes.
Arc Control = Arc Force
Hot Start = Initial hot start current (Mid range = welding current and will
vary up and down with knobcontrol.) During hot start, arc
force is set at high and is fast response.
For gouging applications: Turn current up to 425 amps.
GTAW (Tig mode) 5 - 425 amps The tig mode produces a soft, steady constant current waveform for
either touch start or high frequency assisted start DC GTAW applications.
Hot Start = Min to Mid range = Touch start with low OCV
Mid to Max range = High frequency assistedstarting 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 PowerWave 455.
GMAW - Power 1 - 18 (No Units) Refer to the detailed explanation at the end of this section.
This mode does not allow preset voltage. In the short arc GMAW
mode, the set KW will not equal the actual Volts * Amps. The set
power is regulated only when an arc is present. During shorting, the
output is allowed to increase to clear the short.
OPERATION
B-8 B-8
V350-PRO
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PULSE PROGRAMS:
MODE
Range (IPM*)
.030 Steel 65 - 1200
.035 Steel 55 - 800
.045 Steel 50 - 700
.052 Steel 75 - 550
.045 Metal Core 50 - 650
.052 Metal Core 50 - 500
.030 Stainless Ar Blends 85 - 770
.030 Stainless He Ar CO2 110 - 770
.035 Stainless Ar Blends 65 - 770
.035 Stainless He Ar CO2 75 - 770
.045 Stainless Ar Blends 50 - 600
.045 Stainless He Ar CO2 50 - 600
.035 Aluminum 4043 100 - 700
.035 Aluminum 5356 115 - 740
3/64 Aluminum 4043 80 - 550
3/64 Aluminum 5356 85 - 700
1/16 Aluminum 4043 75 - 325
1/16 Aluminum 5356 75 - 450
.035 Nickel Alloys
(Non Adaptive)
80 - 700
.045 Nickel Alloys
(Non Adaptive)
75 - 550
COMMENTS
The V350 pulse programs are non-synergic and allow independent
control of the wire feed speed (at the wire feeder) and the arc
length. The Output Control Knob on the V350, adjusts an "SPD"
value. Similar to trim, the "SPD" value indicates the relative arc
length setting. The "SPD" value displayed on the V350 may not
match the actual wire feed speed! The value of "SPD" is meant
to be a point at which to set the arc length relative to the wire feed
speed and should be set the same as actual speed for a starting
point. Depending on the application, the "SPD" value can be adjusted to obtain the desired arc length. Refer to the detailed explanation at the end of this section.
The operation of the Arc Control knob on the V350 is similar to the
PowerWave 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
Stainless
Argon Blends =
Argon Blends =
Argon with Oxygen additions up to 2%
Argon with Oxygen additions up to 2%.
Stainless He Ar CO2 = ~ 90% Helium, 7 1/2 % Argon 2 1/2 CO2
Aluminum 100% Argon
The Nickel Alloy pulse programs are non adaptive. The operator
sets the output control knob to deliver the correct arc length at
desired wire feed speed and stick out. While welding, the operator
manipulates the stick out to maintain the correct arc length. This
method of operation produces very stable arc performance considering the nature of nickel alloys.
Preferred gas: Argon/Helium Blends = for the best results add
helium to the argon base from 0-25%.
.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. Refer to the detailed explanation at the
end of this section.
PULSE ON PULSE
*IPM (INCHES PER MINUTE)
OPERATION
B-9 B-9
V350-PRO
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LOWER CASE PANEL
The output studs, line switch and remote connector are
located on the lower case front.
9. Both terminals are "Twist-Mate" connectors.
The Negative terminal is configured to accept the
pass through gas system.
10. 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 indicated by the decal. The switch does not change
the welding polarity.
11.
6-pin MS-style connector for remote control.
12. 14-pin MS-style connector for wire feeder connec-
tion and remote control.
REMOTE CONTROL of the OUTPUT CONTROL and
WELD TERMINALS
The Invertec V350-Pro has auto sensing of remote output controls. If after connecting or removing a remote,
the Invertec V350-Pro did not configure the way you
would like the local or remote control settings can be
changed by pushing the OUTPUT CONTROL or
WELD TERMINAL button. (A user cannot select
between the 6 and 14 pin MS-style connectors.)
CV modes
• The remote will default to the 14-pin MS-style connector if a remote is connected. If no remote is connected to the 14-pin MS-style connector then the
remote will default to the 6-pin MS-style connector if
a remote is connected to it.
• In all of the CV modes, the WELD TERMINAL control will default to REMOTE.
TIG mode
• The remote will default to the 6-pin MS-style if a
remote control is connected to the 6-pin MS-style
and to the 14-pin MS-style connector. If a remote is
not connected to the 6-pin MS-style connector then
the remote will default to the 14-pin MS-style connector if a remote is connected.
• If a remote control is connected to any of the MSstyle connectors the WELD TERMINAL control will
default to REMOTE. If there are not any remote control devices attached the WELD TERMINAL control
will default to ON.
CC-Stick modes
• The remote will default to only the 6-pin MS-style
connector if a remote is connected to it.
• The WELD TERMINAL control will default to ON with
or without a remote connected.
Types of Remote OUTPUT CONTROL
• The Invertec V350-Pro’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 Ms-style connector lead 75 is pin G, lead 76
is pin F and lead 77 is pin E.
• 6-Pin Ms-style connector lead 75 is pin C, lead 76 is
pin B and lead 77 is pin A.
Potentiometer Control
• The total resistance should be between 2000 ohms
(2K) and 10,000 ohms (10K)
• The machine output will be at minimum when lead
76 (wiper) is at the end of the potentiometer that is
connected to 75. The 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 produce the current that has been set by the Invertec V350-Pro’s
front panel Output Control.)
• Remotes of this type offered by Lincoln Electric are
the K857, K812 and K870.
Voltage Control
• The supply must be an isolated supply. (Not referenced to earth ground, any auxiliary power from the
Invertec V350-Pro or the welding output) The supply
should be capable of supplying at least 20mA.
• 0 volts supplied to 76 will set the Invertec V350-Pro
to minimum output for the mode that has been
selected while 10 volts supplied to 76 will set the
Invertec V350-Pro to the maximum output for the
mode. (Note: In TIG mode, 10 volts supplied to lead
76 would produce the current that has been set by
the Invertec V350-Pro’s front panel Output Control.)
Types of Remote WELD TERMINAL Control
• The Invertec V350-Pro’s Weld Terminals can be controlled from each of the MS-style connectors. The
circuit has a nominal OCV of 15VDC and requires a
dry contact closure (less than 100 ohms) to activate
the output of the Invertec V350-Pro.
• 14-Pin MS-style connector, the Weld Terminals are
controlled from pin C (lead 2) and pin D (lead 4). Pin
C is positive.
• 6-Pin MS-style connector, the Weld Terminals are
controlled from pin D (lead 2) and pin E (lead 4). In
the 6-pin MS-style connector pin D is positive.
OPERATION
B-10 B-10
V350-PRO
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AUXILIARY POWER
• 115VAC, 42VAC and 24VAC power is available from
the 14-pin MS-style connector. The Construction
model of the Invertec V350-Pro does not have the
14-pin MS-style connector) These supplies are
intended to supply power for auxiliary equipment like
wire feeders and the TIG Module.
• 115V AC supply is rated at 2 amps and is protected by a 3.5
amp breaker.
• 42 VAC supply is rated at 5.5 amps and is protected
by a 6 amp breaker.
• 24 VAC supply is rated at 5.5 amps and is protected
by a 6 amp breaker.
LIMITATIONS
• The V350-Pro is not recommended for processes
other than those listed.
• The V350-Pro can only be used with the recommended equipment and options.
RECOMMENDED PROCESSES
Properly equipped, the Invertec V350-Pro supports
GMAW-P, FCAW, SMAW, GTAW and CAC-A
processes for a variety of materials, including mild
steel, stainless steel, cored wires, and aluminum.
OPERATION
B-11 B-11
V350-PRO
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SPECIAL WELDING PROCESSES
AVAILABLE ON THIS MACHINE
POWER MODE™
The Power Mode™ process was developed by Lincoln
to maintain a stable and smooth arc at low procedure
settings which are needed to weld thin metal without
pop-outs or burning-through. For Aluminum welding, it
provides excellent control and the ability to maintain
constant arc length. This results in improved welding
performance in two primary types of applications.
• Short Arc MIG at low procedure settings.
• Aluminum MIG welding.
Power Mode™ is a method of high speed regulation of
the output power whenever an arc is established. It
provides a fast response to changes in the arc. The
higher the Power Mode Setting, the longer the arc. If a
welding procedure is not established, the best way to
determine the Power Mode Setting is by experimentation until the desired output result is established.
In the Power Mode variables need to be set:
• Wire Feed Speed
• Output
• Arc Control
Setting up a Power Mode procedure is similar to setting a CV MIG procedure. Select a shielding gas
appropriate for a short arc process.
• For steel, use 75/25 Ar/CO2 shield gas.
• For Stainless, select a Helium blend Tri-Mix.
• For Aluminum, use 100% Ar.
Start by setting the wire feed speed based upon material thickness and appropriate travel speed. Then
adjust the Output knob as follows:
• For steel, listen for the traditional “frying egg”
sound of a good short-arc MIG procedure to know
you have the process set correctly.
• For aluminum, simply adjust the Output knob until
the desired arc length is obtained.
Note the Volts display is simply a relative number and
DOES NOT correspond to voltage.
Some procedure recommendations appear in the table
below.
Recommended Welding Procedures for Power Mode
OPERATION
MATERIAL
WIRE
WIRE SIZE
GAS
MATERIAL THICKNESS
WFS / POWER MODE SETTING
Aluminum 4043 Aluminum 5356 Mild Steel
E4043 E5356 L56 L56 L56 L56 L56 L56 E308L E308L
0.035 0.035 0.025 0.025 0.030 0.030 0.035 0.035 0.030 0.035
100% Ar. 100% Ar. 100% CO
125 / 2.25 125 / 1.75 100 / 0.8 90 / 1.0
22 ga.
150 / 2.5 150 / 2.3 120 / 1.0
20 ga.
18 ga.
200 / 3.75 200 / 3.0
16 ga.
300 / 7.75 300 / 6.85
14 ga.
400 / 9.0 400 / 7.5
12 ga.
450 / 9.5 450 / 8.0
10 ga.
500 / 10.0 500 / 8.5
3/16
600 / 11.25 600 / 9.5
1/4
Not Recommended Not Recommended
140 / 1.7
190 / 2.0
260 / 3.0
330 / 5.0
700 / 11
Mild Steel Mild Steel Mild Steel Mild Steel Mild Steel Stainless Steel Stainless Steel
2
75/25% Ar/CO
2
120 / 1.0
140 / 1.5
190 / 2.0
260 / 3.0
330 / 4.5
100% CO
100 / 0.7
110 / 1.5
125 / 2.0
160 / 2.3
230 / 3.5
300 / 6.0
400 / 7.5
2
75/25% Ar/CO
100 / 1.0
110 / 1.5
125 / 2.0
160 / 2.3
230 / 3.5
300 / 6.0
400 / 7.0
100% CO
2
2
75/25% Ar/CO
2
Tri-mix Tri-mix
80 / 1.5 50 / 0.5
100 / 2.5 100 / 2.5 110 / 2.0 110 / 2.0
125 / 3.0 125 / 3.0 140 / 2.5 130 / 2.7
160 / 3.8 160 / 3.5 190 / 3.5210 / 3.0
200 / 5.0 200 / 4.5 270 / 5.0 230 / 6.0
240 / 6.5 240 / 7.0 325 / 6.5 300 / 7.0
B-12 B-12
V350-PRO
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PULSE WELDING (GMAW-P)
The pulsed-arc process is, by definition, a spray transfer process wherein spray transfer occurs in pulses at
regularly spaced intervals. In the time between pulses,
the welding current is reduced and no metal transfer
occurs.
Pulsed-arc transfer is obtained by operating a power
source between low and high current levels. The high
current level or “pulse” forces an electrode drop to the
workpiece. The low current level or “background” maintains the arc between pulses. (See Figure below).
Pulsed MIG is an advanced form of welding that takes
the best of all the other forms of transfer while minimizing or eliminating their disadvantages. Unlike short circuit, pulsed MIG does not create spatter or run the risk
of cold lapping. The welding positions in pulsed MIG are
not limited as they are with globular or spray and its wire
use is definitely more efficient. Unlike the spray arc
process, pulsing offers controlled heat input that allows
better welding on thin materials, lower wire feed speeds
and leads to less distortion and improved overall quality
and appearance. This is especially important with stainless, nickel and other alloys that are sensitive to heat
input.
In GMAW-P mode, arc control adjusts the background
current and frequency of the wave. When arc control
goes up, the frequency increases thus increasing the
droplet transfer.
OPERATION
EACH PULSE DELIVERS ONE DROPLET OF WELD MATERIAL
PEAK AMPS
FREQUENCY
SPRAY TRANSITION
CURRENT
B-13 B-13
V350-PRO
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PULSE-ON-PULSE™ (GMAW-PP)
Pulse on Pulse™ is a Lincoln process specifically
designed for use in welding relatively thin (less than
1/4" thick) aluminum (See the table below). It gives
weld beads with very consistent uniform ripple.
In Pulse on Pulse modes, two distinct pulse types are
used, instead of the single pulse type normally used in
GMAW-P. Anumber of high energy pulses are used to
obtain spray transfer and transfer metal across the arc.
Such pulses are shown in the figure below. After a
number "N" of such pulses, depending on the wire feed
speed used, an identical number "N" of low energy
pulses are performed. These low energy pulses,
shown in the figure below, do not transfer any filler
metal across the arc and help to cool the arc and keep
the heat input low.
The Peak Current, Background Current, and
Frequency are identical for the high energy and low
energy pulses. In addition to cooling the weld down,
the major effect of the low energy pulses is that they
form a weld ripple. Since they occur at very regular
time intervals, the weld bead obtained is very uniform
with a very consistent ripple pattern. In fact, the bead
has its best appearance if no oscillation of the welding
gun ("whipping") is used.(See the figure below)
When Arc Control is used in the Pulse on Pulse modes,
it does the same things it does in the other pulsed
modes: decreasing the Arc Control decreases the
droplet transfer and weld deposition rate. Increasing
the Arc Control increases the droplet transfer and weld
deposition rate. Since Arc Control varies weld droplet
transfer rate, the Arc Control can be used to vary the
ripple spacing in the weld bead.
BENEFITS OF PULSE ON PULSE FROM
LINCOLN ELECTRIC
• Excellent appearance of the weld bead
• Improved cleaning action
• Reduced porosity
Table B.2 shows WFS and Trim settings for common
aluminum types and wire sizes when welding with
Pulse-on-Pulse. The welds made to obtain the values
in the table were fillet welds in the flat position. The values in the table can be helpful as a starting point to
establish a welding procedure. From there, adjustments need to be made to set the proper procedure for
each specific application (out-of-position, other types
of joints, etc.).
The comments on the table below show values of WFS
below which it is not recommended to weld. The reason is, that below these values the weld transfer will
change from a spray arc to a short-arc, which is not
advisable when welding aluminum.
WELDING PROCEDURES FOR PULSE-ON-PULSE
OPERATION
"N" PULSES "N" PULSES
PEAK
AMPS
BACKGROUND
AMPS
HIGH HEAT
PULSES
TIME
LOW HEAT
PULSES
MATERIAL
GAS
WIRE
WIRE SIZE
MATERIAL
THICKNESS
WFS /
ARC CONTROL
COMMENTS
14 ga. 250 / 0 200 / 0 230 / 0 225 / 0
10 ga. 400 / 0 280 / 0 425 / 0 400 / 0
Aluminum 4043 Aluminum 4043 Aluminum 5356 Aluminum 5356
100% Ar. 100% Ar. 100% Ar. 100% Ar.
E4043 E4043 E5356 E5356
0.035 3/64 0.035 3/64
3/16 550 / 0 340 / 0 670 / 0 500 / 0
1/4 600 / 0 400 / 0 700 / 0 550 / 0
Not Recommended
below 200 WFS
Not Recommended
below 100 WFS
Not Recommended
below 200 WFS
Not Recommended
below 200 WFS
B-14 B-14
V350-PRO
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NOTES
C-1 C-1
V350-PRO
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TABLE OF CONTENTS
- ACCESSORIES SECTION -
Accessories...........................................................................................................................Section C
Cobramatic & Tig Module Connection Instructions ...................................................................C-2
Options/Accessories...................................................................................................................C-2
Quick Disconnect Plugs .............................................................................................................C-3
Connection of Lincoln Electric Wire Feeders............................................................C-4 Thru C-11
V350-PRO/LN-25 with Optional 6 Pin K441-1 Remote.......................................................C-4
V350-PRO/LN-25 with Optional 6 Pin K857 Remote ..........................................................C-5
LN-25 with K431 Remote Option.........................................................................................C-6
V350-PRO/LN-25 with K867 Adapter ..................................................................................C-7
V350-PRO/LN-7 with K480 Control Cable ..........................................................................C-8
V350-PRO/LN-7 with K867 Adapter ....................................................................................C-9
V350-PRO/LN-742 .............................................................................................................C-10
V350-PRO/LN-10 with K1505 Control Cable ....................................................................C-11
ACCESSORIES
C-2 C-2
V350-PRO
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Cobramatic Connection Instructions
ACobramatic can only be used with a Factory or
"CE" version of the V350
1. Turn the Invertec power switch "off"
2. Connect the control cable from the Cobramatic to
the 24/42 VAC 14-pin wire feeder amphenol on
the rear of the Invertec.
3. Connect the electrode cable to the output terminal
of the polarity required by electrode. Connect the
work lead to the other terminal.
4. Set the meter polarity switch on the front of the
Invertec to coincide with wire feeder polarity used.
5. 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 14pin wire feeder amphenol connector on the rear of
the Invertec.
TIG Module K930-2
The TIG Module connects to the V350-Pro Factory or
CE versions 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.
The TIG Module can also be used with the V350
Construction version. AK936-4 control cable is
required to supply 115VAC to the TIG Module from an
external 115VAC supply.
General Instructions for Connection of Wire
Feeders to V350-Pro
Wire feeders other than LN-7 and LN-25 may be used
provided that the auxiliary power supply capacity of
the V350-Pro is not exceeded. K867 universal
adapter plug is required. See connection diagram
S19406 and S19386 at the back of this manual for
more information.
Remote Control of Invertec
Remote Control K857, Hand Amptrol K963 and Foot
Amptrol K870.
OPTIONS / ACCESSORIES
Construction Version – K1728-2
• All welding modes for this model run with local output control and weld terminals ON (e.g. Stick, TIG,
LN25 off the arc).
K930-1 TIG Module
K428,K446, K449 LN-25(Off the Arc)
"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.
Field Installed Options/Accessories
Two versions of the V350-Pro are available from the
factory for both the CE and ROW versions.
Options for K1728-1 Factory and K1728-3 "CE"
V350’s
• TIG Gas Control Kit – K1762-2
• Advanced Process Panel – K1763-1
Options for all models of V350-PRO
• Undercarriage – K1764-1
• Valet Style Undercarriage - K1838-1
Welding Cable Connectors:
• K852-70 1/0-2/0 cable
• K852-95 2/0-3/0 cable
FACTORY VERSION and
ADVANCED PROCESS VERSION
K857 Remote Output Control
K814 Arc Start Switch
K812 Hand Operated Amptrol
K870 Foot Operated Amptrol
Note: All of the above remote controls connect directly
to the 6-pin MS-style connector, with either a K864 or
K876 adapter and connect it to the 14 pin wire feeder
MS-style connector. (See Diagram in Section F-1)
K930-[ ] TIG Module
K428, K446, K449 LN-25 *
K617 (-1 or -2) K618 (-1 or -2) LN-742
K440 (-1), K567-1 LN-7 GMA
K1559-1, K1564-1 LN-10
K1499-1, K1521-1 DH-10
K1587-1 Cobramatic
*Not recommended for pulse welding
ACCESSORIES
C-3 C-3
V350-PRO
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QUICK DISCONNECT PLUGS
A quick disconnect system is used for the welding
cable connections. The K852-70 is designed to
accept a welding cable size of 1/0 to 2/0.
1. Remove 25mm (1 in.) of welding cable insulation.
2. Slide rubber boot onto cable end. The boot end
may be trimmed to match the cable diameter.
Soap or other lubricant will help to slide the boot
over the cable.
3. Slide the copper tube into the brass plug.
4. Insert cable into copper tube.
5. Tighten set screw to collapse copper tube. Screw
must apply pressure against welding cable. The
top of the set screw will be well below the surface
of the brass plug after tightening.
6. Slide rubber boot over brass plug. The rubber
boot must be positioned to completely cover all
electrical surfaces after the plug is locked into the
receptacle.
25 mm
1 in.
WELDING CABLE
BOOT
TRIM
SET SCREW
BRASS PLUG
COPPER TUBE
CONNECTION OF LINCOLN ELECTRIC WIRE FEEDERS
CONNECTION OF THE LN-25 TO THE
V350-PRO “ACROSS THE ARC” WITH
OPTIONAL 6 PIN K441-1 REMOTE CONTROL.
1. Remove input power to the V350-PRO.
2. Connect the electrode cable to the output terminal
of polarity required by the electrode. Connect the
work lead to the other terminal. Welding cable
must be sized for current and duty cycle of the
application.
3. Attach the single lead from the LN-25 control box
to the work using the spring clip on the end of the
lead. This is only a control lead - it carries no
welding current.
4. Set the voltmeter switch to the electrode polarity
chosen.
5. Set “CONTROL SELECT” to “REMOTE”.
6. Set the “MODE” to the “CV-WIRE” position.
7. Set “WELD TERMINALS SELECT” to the “ON”
position.
If you are using an LN-25 without an internal contactor, the electrode will be “HOT” when the V350PRO is energized.
8. Set the “ARC CONTROL” to the “O” position and
then adjust to suit.
CAUTION
ACCESSORIES
C-4 C-4
V350-PRO
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Figure C.1 V350-PRO/LN-25 ACROSS THE ARC CONNECTION DIAGRAM
NOTE: Illustration shows electrode connected for negative polarity.
6 pin
Amphenol
Optional K444-1
Remote Control
LN-25
+ -
Wire Feeder
Work Clip Lead
To Work
To Work
Electrode Cable
CONNECTION OF THE LN-25 TO THE
V350-PRO “ACROSS THE ARC” WITH
OPTIONAL 6 PIN K857 REMOTE CONTROL.
1. Remove input power to the V350-PRO.
2. Connect the electrode cable to the output terminal
of polarity required by the electrode. Connect the
work lead to the other terminal. Welding cable
must be sized for current and duty cycle of the
application.
3. Connect the K857 remote control to the 6-pin
amphenol on the V350-PRO.
4. Attach the single lead from the LN-25 control box
to the work using the spring clip on the end of the
lead. This is only a control lead - it carries no
welding current.
5. Set the voltmeter switch to the electrode polarity
chosen.
6. Set “CONTROL SELECT” to “REMOTE”.
7. Set the “MODE” to the “CV-WIRE” position.
8. Set “WELD TERMINALS SELECT” to the “ON”
position.
If you are using an LN-25 without an internal contactor, the electrode will be “HOT” when the V350PRO is energized.
9. Set the “ARC CONTROL” to the “O” position and
then adjust to suit.
ACCESSORIES
C-5 C-5
V350-PRO
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CAUTION
NOTE: Illustration shows electrode connected for negative polarity.
Figure C.2 V350-PRO/LN-25 ACROSS THE ARC CONNECTION DIAGRAM WITH K857
REMOTE CONTROL
K857
6 pin
Remote Control
Amphenol
LN-25
+ -
Wire Feeder
Work Clip Lead
To Work
To Work
Electrode Cable
ACCESSORIES
C-6 C-6
V350-PRO
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CONNECTION OF THE LN-25 WITH K431
REMOTE OPTION TO THE V350-PRO.
NOTE: AN LN-25 CAN ONLY BE USED WITH A FACTORY OR “CE” VERSION OF THE V350-PRO.
1. Remove input power to the V350-PRO.
2. Connect the electrode cable to the output terminal
of polarity required by the electrode. Connect the
work lead to the other terminal. Welding cable
must be sized for current and duty cycle of the
application.
3. Attach the single lead from the LN-25 control box
to the work using the spring clip on the end of the
lead. This is only a control lead - it carries no
welding current.
4. Set the voltmeter switch to the electrode polarity
chosen.
5. Set “CONTROL SELECT” to “REMOTE”.
6. Set the “MODE” to the “CV-WIRE” position.
7. Set “WELD TERMINALS SELECT” to the
“REMOTE” position.
8. Set the “ARC CONTROL” to the “O” position and
then adjust to suit.
9. Connect the K432 remote control cable to the LN-
25.
10. Connect the K876 adapter to the K432 and to the
24/42VAC 14-pin amphenol located at the rear of
the V350-PRO.
11. Adjust the wire feed speed and voltage at the LN-
25.
NOTE: See Figure C.4 for connection Using K867
adapter.
NOTE: Illustration shows electrode connected for positive polarity.
Figure C.3 LN-25 with K431 Remote Option to the V350-PRO
ELECTRODE CABLE
TO LN-25
TO
WORK
14 PIN (24/42VAC)
AMPHENOL
6 PIN AMPHENOL
-
+
INVERTEC
POWER SOURCE
K876 ADAPTER
K432 REMOTE
CONTROL CABLE
LN-25 WITH
K431 OPTION
ACCESSORIES
C-7 C-7
V350-PRO
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CONNECTION OF THE K867 ADAPTER
FOR USE WITH LN-25 WITH K431
OPTION/V350-PRO.
1. Insulate each unused lead individually.
2. Remove 6 pin plug from K432 cable in order to
connect K867 adapter.
3. Label each lead (A thru F) as they are removed
from the 6 pin plug.
4. Splice leads and insulate.
Figure C.4 Connection of LN-25 to V350-PRO using K867 adapter.
ELECTRODE CABLE
TO LN-25
TO
WORK
-
+
INVERTEC
POWER SOURCE
14 PIN
(24/42VAC)
AMPHENOL
K867 ADAPTER
21
82
81
42
41
GND
31
32
2
4
SPARE
75
76
1
E
F
D
A
B
C77
4
LN-25 WITH
K431 OPTION
K432 REMOTE
CONTROL CABLE
ACCESSORIES
C-8 C-8
V350-PRO
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CONNECTION OF THE LN-7 TO THE V350PRO USING K480 CONTROL CABLE (SEE
FIGURE C.5)
NOTE: AN LN-7 CAN ONLY BE USED WITH A FACTORY OR “CE” VERSION OF THE V350-PRO. IF
YOUR LN-7 COMES EQUIPPED WITH A K291 OR
K404 INPUT CABLE, REFER TO THE CONNECTION
OF THE LN-7 USING K867 UNIVERSAL ADAPTER.
1. Remove input power to the V350-PRO.
2. Connect the electrode cable from the K480 control
cable to the “+” terminal of the welder and to the
LN-7 wire feeder. Connect the work cable to the
“-” terminal of the welder.
NOTE: Figure C.5 shows the electrode connected
for positive polarity. To change polarity, shut the
welder off and reverse the electrode and work
cables at the output terminals.
NOTE: Welding cable must be sized for current
and duty cycle of application.
3. Connect the input cable from the K480 control
cable to the (115VAC) 14 pin amphenol on the
V350-PRO and the input cable plug on the LN-7.
4. Set the “VOLTMETER” switch to “+” or “-”
depending on the polarity chosen.
5. Set “CONTROL SELECT” to “REMOTE”.
6. Set the “MODE” to the “CV-WIRE” position.
7. Place the “WELD TERMINALS SELECT” in the
“REMOTE” position.
8. Adjust wire feed speed at the LN-7 and adjust the
welding voltage with the optional remote control if
used.
9. Set the “ARC” control at “0” initially and adjust to
suit.
Figure C.5 V350-PRO/LN-7 with K480 Control Cable Connection Diagram
TO LN-7 INPUT
14 PIN
AMPHENOL
(115VAC)
AT REAR OF
MACHINE
- +
6 PIN
AMPHENOL
TO WORK
CABLE PLUG
OPTIONAL K857
REMOTE CONTROL
K480 CONTROL CABLE
ELECTRODE CABLE
TO WIRE FEED UNIT
ACCESSORIES
C-9 C-9
V350-PRO
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CONNECTION OF THE K867 ADAPTER
FOR USE WITH THE K291 OR K404 INPUT
CABLES AND LN-7.
1. Insulate each unused lead individually.
2. Splice leads and insulate.
Figure C.6 Connection of LN-7 to V350-PRO using K867 adapter.
SPARE
SPARE
82
ELECTRODE CABLE
ELECTRODE CABLE
TO LN-7
TO LN-7
TO
TO
WORK
WORK
-
-
+
+
INVERTEC
INVERTEC
POWER SOURCE
POWER SOURCE
14 PIN
14 PIN(115VAC)
AMPHENOL
AMPHENOL
K867 UNIVERSAL
K867 UNIVERSAL
ADAPTER PLUG
ADAPTER PLUG
82
81
81
42
42
41
41
31
31
32
32
2
2
4
4
21
21
GND
GND
75
75
76
76
77
77
1
31
31
32
32
2
2
4
4
21
21
GND
GND
GREEN
GREEN
75
75
76
76
77
77
2
K291 OR K404
K291 OR K404
INPUT CABLE
INPUT CABLE
LN-7
LN-7
CONTROL
CONTROL
BOX
BOX
K775 OPTIONAL
K775 OPTIONAL
REMOTE CONTROL
REMOTE CONTROL
C-10 C-10
V350-PRO
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ACCESSORIES
CONNECTION OF THE LN-742 TO THE
V350-PRO (SEE FIGURE C.7)
NOTE: AN LN-7 CAN ONLY BE USED WITH A FACTORY OR “CE” VERSION OF THE V350-PRO.
1. Remove input power to the V350-PRO.
2. Connect the electrode cable from the LN-742 to
the “+” terminal of the welder. Connect the work
cable to the “-” terminal of the welder.
NOTE: Figure C.7 shows the electrode connected
for positive polarity. To change polarity, shut the
welder off and reverse the electrode and work
cables at the output terminals.
NOTE: Welding cable must be sized for current
and duty cycle of application.
3. Connect the K591 control cable to the 24/42VAC
14 pin amphenol on the back of the V350-PRO
and the input cable plug on the LN-742.
4. Set the “VOLTMETER” switch to “+” or “-”
depending on the polarity chosen.
5. Set the “MODE” to the “CV-WIRE” position..
6. Set “CONTROL SELECT” to “LOCAL”.
7. Place the “WELD TERMINALS SELECT” in the
“REMOTE” position.
8. Adjust wire feed speed at the LN-742.
9. Set the “ARC” control at “0” initially and adjust to
suit.
Figure C.7 V350-PRO/LN-742 Connection Diagram
14 PIN
AMPHENOL
(24/42VAC)
AT REAR OF
MACHINE
+ -
TO LN-742 INPUT
CABLE PLUG
K591 CONTROL CABLE
ELECTRODE CABLE
TO WIRE FEED UNIT
TO WORK
CONNECTION OF THE LN-10 TO THE
V350-PRO USING THE K1505 CONTROL
CABLE.
NOTE: AN LN-10 CAN ONLY BE USED WITH A FACTORY OR “CE” VERSION OF THE V350-PRO.
1. Remove input power to the V350-PRO.
2. Connect the K1505 control cable from the LN-10
to the Invertec 24/42VAC 14 pin amphenol connecter on the rear of the V350-PRO.
3. Connect the electrode cable to the output terminal
of polarity required by the electrode. Connect the
work lead to the other terminal.
4. Set the meter polarity switch on the front of the
V350-PRO to coincide with wire feeder polarity
used.
5. Set “CONTROL SELECT” to “REMOTE”.
6. Set the “MODE” to the “CV-WIRE” position..
7. Set the “WELD TERMINALS SELECT” to the
“REMOTE” position.
8. Set the “ARC CONTROL” to the “0” position and
then adjust to suit.
9. Set wire feed speed and voltage at the LN-10.
NOTE: The voltage set point displayed on the
V350-PRO should be ignored when operating in
the remote control mode with the LN-10.
10. See the LN-10 manual for details on accessing
the control DIP switch.
11. The control DIP switch inside the LN-10 should be
set per the instructions in the LN-10 manual.
ACCESSORIES
C-11 C-11
V350-PRO
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Figure C.8 LN-10 V350-PRO
14 PIN
AMPHENOL
(24/42VAC)
AT REAR OF
MACHINE
+ -
TO LN-10
K1505
TO WORK
ELECTRODE CABLE
TO LN-10
NOTES
C-12 C-12
V350-PRO
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Section D-1 Section D-1
V350-PRO
TABLE OF CONTENTS
-MAINTENANCE-
Maintenance .........................................................................................................................Section D
Capacitor Discharge Procedure .................................................................................................D-2
Visual Inspection.........................................................................................................................D-2
Routine Maintenance..................................................................................................................D-2
Periodic Maintenance .................................................................................................................D-2
Major Component Locations .....................................................................................................D-3
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MAINTENANCE
D-2 D-2
V350-PRO
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Have qualified personnel do the maintenance
work. Always use the greatest care when
working near moving parts.
Do not put your hands near the cooling blower
fan. If a problem cannot be corrected by
following the instructions, take the machine to
the nearest Lincoln Field Service Shop.
-----------------------------------------------------------------------
WARNING
VISUAL INSPECTION
Clean interior of machine with a low pressure air
stream. Make a thorough inspection of all components. Look for signs of overheating, broken leads or
other obvious problems. Many problems can be
uncovered with a good visual inspection.
ROUTINE MAINTENANCE
1. Every 6 months or so the machine should be
cleaned with a low pressure airstream. Keeping
the machine clean will result in cooler operation
and higher reliability. Be sure to clean these
areas:
• All printed circuit boards
• Power switch
• Main transformer
• Input rectifier
• Auxiliary Transformer
• Reconnect Switch Area
• Fan (Blow air through the rear louvers)
2. Examine the sheet metal case for dents or breakage.
Repair the case as required. Keep the case in good
condition to insure that high voltage parts are protected
and correct spacings are maintained. All external sheet
metal screws must be in place to insure case strength
and electrical ground continuity.
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.
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.
------------------------------------------------------------------------
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 resistor 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
WARNING
WARNING
AVISO DE
PRECAUCION
ATTENTION
!
!
!
!
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WARNING
REMOTE
POWER
OFF
ON
A
AMPS
A
V
VOLTS
WELD TERMINALS
SELECT
OUTPUT
HO
T START
ARC C
ONTR
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
S
E
L
E
C
T
C
C
-S
T
IC
K
7
0
1
8
C
C
-S
T
IC
K
6
0
1
0
T
IG
G
T
A
W
C
V
-W
IR
E
C
V
-F
L
U
X
C
O
R
E
D
5
3
4
2
1
MAINTENANCE
D-3 D-3
V350-PRO
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FIGURE D.1 – MAJOR COMPONENT LOCATIONS
1. Center Panel
2. Base Assembly
3. Case Back
4. Case Front
5. Case Wraparound
NOTES
D-4 D-4
V350-PRO
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
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Section E-1 Section E-1
V350-PRO
Theory of Operation .............................................................................................................Section E
General Description ....................................................................................................................E-2
Input Line Voltage, Auxiliary Transformer and Precharge...........................................................E-2
Switch Board and Main Transformer ..........................................................................................E-3
Power board, Control Board, and SPI Communications............................................................E-4
Output Rectifier and Choke ........................................................................................................E-5
Thermal Protection .....................................................................................................................E-6
Protection Circuits ......................................................................................................................E-6
Over current Protection ........................................................................................................E-6
Under/Over Voltage Protection ............................................................................................E-6
Insulated Gate Bipolar Transistor (IGBT) Operation ...................................................................E-7
Pulse Width Modulation..............................................................................................................E-8
Minimum/Maximum Output..................................................................................................E-8
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
Remote
Board
Mode
Panel
Display
Panel
Control Board
Choke
Positive
Output
Terminal
Negative
Output
Terminal
To Control
Board
Current
Feedback
Reconnect
Switch
Output Voltage Sense
Input switch
Input
Rectifier
Auxiliary
Transformer
Fan
Power
Board
14 Pin
Amphenol
6 Pin
Amphenol
Remote Control & Trigger
RS232 Supply +5VDC
SPI Supply +15VDC +5VDC
Machine Control Supply
+15VDC, -15VDC, +5VDC
40VDC
28VAC
24VAC
115VAC, 42VAC
Main Switch Board
115VAC Fan Supply
Optional Solenoid
SPI Communications & +15VDC, +5VDC Supply
Fan Control
V/F Capacitor Feedback (2)
Soft Start Control
Input Relay Control
Primary Current Feedback
IGBT Drive Signal
Primary
Current
Sensor
Primary
Current
Sensor
Output
Potentiometer
Output
Control
Weld
Terminals
Advanced
Process
Panel
RS232
12 VDC
(Not used if APP
is in place)
FIGURE E.1 – V350-PRO BLOCK LOGIC DIAGRAM
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FIGURE E.2 – INPUT VOLTAGE AND PRECHARGE
GENERAL DESCRIPTION
The Invertec V350-Pro is an inverter based welding
power source that offers multi mode constant voltage
(CV) and constant current (CC) welding and is rated at
350 amps 34VDC at a 60% duty cycle. The Invertec
V350-Pro is available in a construction version (no wire
feeder connection or auxiliary power ), a factory version that includes a wire feeder connection and related power, an advanced process version and a rack
version.
INPUT LINE VOLTAGE, AUXILIARY
TRANSFORMER, & PRECHARGE
The Invertec V350-Pro can be connected for a variety
of three-phase or single-phase input voltages. The initial power is applied to the V350 through a line switch
located on the front of the machine. Two phases of the
input voltage are applied to the auxiliary transformer.
The auxiliary transformer develops four different secondary voltages. The 115VAC is used to power the fan
motor and also is applied to the 14 pin amphenol type
connector for wirefeeder operation. The 24VAC and
42VAC voltages are also applied to the 14 pin amphenol type connector to power wirefeeders. The 28VAC
is rectified and the resultant 40VDC is applied to the
power board.
The input voltage is rectified by the input rectifier and
the resultant DC voltage is applied to the switch board
through the reconnect switch assembly located at the
rear of the machine. The reconnect switch connect the
two pairs of input capacitors either in a parallel (lower
voltage) or series (higher voltage) configuration to
accommodate the applied input voltage.
During the precharge time the DC input voltage is
applied to the input capacitors through a current limiting circuit. The input capacitors are charged slowly
and current limited. A voltage to frequency converter
circuit located on the switch board monitors the
capacitor voltages. This signal is coupled to the control board (measure frequency, not voltage to check
signal). When the input capacitors have charged to an
acceptable level, the control board energizes the input
relays, that are located on the switch board, making all
of the input power, without current limiting, available
to the input capacitors. If the capacitors become
under or over voltage the control board will de-energize the input relays and the V350 output will be disabled. Other possible faults may also cause the input
relays to drop out.
THEORY OF OPERATION
E-2 E-2
V350-PRO
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
To Control
Main Switch Board
Board
Feedback
Current
Input switch
115VAC, 42VAC
24VAC
14 Pin
Amphenol
6 Pin
Amphenol
Auxiliary
Transformer
28VAC
Input
Rectifier
115VAC Fan Supply
40VDC
Reconnect
Switch
Fan
Fan Control
Machine Control Supply
+15VDC, -15VDC, +5VDC
Power
SPI Supply +15VDC +5VDC
Board
RS232 Supply +5VDC
Remote Control & Trigger
Output
Output
Potentiometer
Control
V/F Capacitor Feedback (2)
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback
Input Relay Control
Soft Start Control
Remote
Board
Weld
Terminals
Choke
IGBT Drive Signal
Output Voltage Sense
Control Board
SPI Communications & +15VDC, +5VDC Supply
Mode
Panel
(Not used if APP
12 VDC
is in place)
Optional Solenoid
Display
Panel
Advanced
Process
Panel
Positive
Output
Terminal
Negative
Output
Terminal
RS232
SWITCH BOARD &
MAIN TRANSFORMER
There is one switch board in the Invertec V350-Pro.
This board incorporates two pairs of input capacitors,
two insulated gate bipolar transistor (IGBT) switching
circuits, a fan motor drive circuit, and a voltage/frequency capacitor feedback circuit. The two capacitors in a pair are always in series with each other.
When the reconnect switch is in the lower voltage
position the capacitor pairs are in parallel . Thus two
series capacitors in parallel with two series capacitors.
When the reconnect switch is in the high voltage position the two capacitor pairs are in series. Thus four
capacitors in series. This is required to accommodate
the higher input voltages.
When the input capacitors are fully charged they act
as power supplies for the IGBT switching circuits.
When welding output is required the Insulated Gate
Bipolar Transistors switch the DC power from the input
capacitors, "on and off" thus supplying a pulsed DC
current to the main transformer primary windings. See
IGBT Operation Discussion and Diagrams in this
section. Each IGBT switching circuit feeds current to
a separate, oppositely wound primary winding in the
main transformer. The reverse directions of current
flow through the main transformer primaries and the
offset timing of the IGBT switching circuits induce an
AC square wave output signal at the secondary of the
main transformer. The two current transformers (CT)
located on the switch board monitor these primary
currents. If the primary currents become abnormally
high the control board will shut off the IGBTs, thus disabling the machine output. The DC current flow
through each primary winding is clamped back to
each respective input capacitor when the IGBTs are
turned off. This is needed due to the inductance of the
transformer primary winding. The firing of the two
switch boards occurs during halves of a 50 microsecond interval, creating a constant 20 KHZ output. In
some low open circuit Tig modes the firing frequency
is reduced to 5KHZ.
The Invertec V350-Pro has a F.A.N. fan as needed circuit. The fan operates when the welding output terminals are energized or when a thermal over temperature condition exists. Once the fan is activated it will
remain on for a minimum of five minutes. The fan driver circuit is housed on the switch board but it is activated from a control board signal.
THEORY OF OPERATION
E-3 E-3
V350-PRO
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – SWITCH BOARD & MAIN TRANSFORMER
To Control
Main Switch Board
Board
Feedback
Current
Input switch
115VAC, 42VAC
24VAC
14 Pin
Amphenol
6 Pin
Amphenol
Auxiliary
Transformer
28VAC
Input
Rectifier
115VAC Fan Supply
40VDC
Reconnect
Switch
Fan
Fan Control
Machine Control Supply
+15VDC, -15VDC, +5VDC
Power
SPI Supply +15VDC +5VDC
Board
RS232 Supply +5VDC
Remote Control & Trigger
Output
Control
Output
Potentiometer
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback
Input Relay Control
Soft Start Control
V/F Capacitor Feedback (2)
SPI Communications & +15VDC, +5VDC Supply
Remote
Board
12 VDC
Weld
Terminals
Optional Solenoid
IGBT Drive Signal
Control Board
Mode
Panel
(Not used if APP
is in place)
Display
Panel
Choke
Output Voltage Sense
Advanced
Process
Panel
Positive
Output
Terminal
Negative
Output
Terminal
RS232
THEORY OF OPERATION
E-4 E-4
V350-PRO
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FIGURE E.4 – POWER BOARD, CONTROL BOARD
AND SERIAL PERIPHERAL INTERFACE (SPI) COMMUNICATIONS
POWER BOARD, CONTROL BOARD
AND SERIAL PERIPHERAL INTERFACE (SPI) COMMUNICATIONS
POWER BOARD
The 28VAC auxiliary is rectified and filtered and applied
to the power board. The power board, utilizing a
switching power supply, processes the 40VDC input
and develops several regulated positive and negative
DC supplies. Three DC supplies are fed to the control
board for machine control supplies. Two positive DC
voltages are coupled to the control board for the Serial
Peripheral Communications (SPI) supplies. A +5VDC
is used for the RS232 connection supply. An over or
under input voltage detection and shutdown circuit is
also part of the power board’s circuitry. The optional
12VDC gas solenoid is powered by the remote board.
CONTROL BOARD
The control board performs the primary interfacing
functions to establish and maintain output control of
the V350 machine. The control board sends and
receives command signals from the mode or advanced
process panel, the display panel and the remote panel.
These communications are processed through a digital network called a Serial Peripheral Interface (SPI).
This network digitally communicates to and from the
control board the user’s commands and various
machine status messages. The software that is contained within the control board processes and compares these commands with the voltage and current
feedback information it receives from the output current sensor and the output voltage sensing leads. The
appropriate pulse width modulation (PWM) signals
(See Pulse Width Modulation in this section) are sent
to the switch board IGBTs. In this manner, the digitally controlled high-speed welding waveform is created
and regulated.
The control board also monitors the thermostats, the
main transformer primary currents and the input
capacitor voltages.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
Main Switch Board
To Control
Board
Feedback
Current
Input switch
115VAC, 42VAC
24VAC
14 Pin
Amphenol
6 Pin
Amphenol
Auxiliary
Transformer
28VAC
Input
Rectifier
115VAC Fan Supply
40VDC
Reconnect
Switch
Fan
Machine Control Supply
Power
Board
+15VDC, -15VDC, +5VDC
SPI Supply +15VDC +5VDC
RS232 Supply +5VDC
Remote Control & Trigger
Output
Control
Output
Potentiometer
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback
Input Relay Control
Soft Start Control
V/F Capacitor Feedback (2)
Fan Control
Remote
Board
Weld
Terminals
Choke
IGBT Drive Signal
Output Voltage Sense
Control Board
SPI Communications & +15VDC, +5VDC Supply
Mode
Panel
(Not used if APP
12 VDC
is in place)
Optional Solenoid
Display
Panel
Advanced
Process
Panel
Positive
Output
Terminal
Negative
Output
Terminal
RS232
OUTPUT RECTIFIER AND CHOKE
The output rectifier receives the AC output from the
main transformer secondary and rectifies it to a DC
voltage level. Since the output choke is in series with
the negative leg of the output rectifier and also in
series with the welding load, a filtered DC output is
applied to the machine’s output terminals.
THEORY OF OPERATION
E-5 E-5
V350-PRO
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FIGURE E.5 – OUTPUT RECTIFIER AND CHOKE
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
To Control
Main Switch Board
Board
Feedback
Current
Input switch
115VAC, 42VAC
24VAC
14 Pin
Amphenol
6 Pin
Amphenol
Auxiliary
Transformer
28VAC
Input
Rectifier
115VAC Fan Supply
40VDC
Reconnect
Switch
Fan
Machine Control Supply
+15VDC, -15VDC, +5VDC
Power
SPI Supply +15VDC +5VDC
Board
RS232 Supply +5VDC
Remote Control & Trigger
Output
Control
Output
Potentiometer
Primary Current Feedback
Input Relay Control
Soft Start Control
V/F Capacitor Feedback (2)
Fan Control
Remote
Board
Weld
Terminals
Primary
Current
Sensor
Choke
Primary
Current
Sensor
IGBT Drive Signal
Control Board
SPI Communications & +15VDC, +5VDC Supply
12 VDC
Mode
Panel
(Not used if APP
is in place)
Display
Panel
Optional Solenoid
Output Voltage Sense
Advanced
Process
Panel
Positive
Output
Terminal
Negative
Output
Terminal
RS232
THERMAL PROTECTION
Two normally closed (NC) thermostats protect the
machine from excessive operating temperatures.
These thermostats are wired in series and are connected to the control board. One of the thermostats is
located on the heat sink of the switch board and the
other is located on the output choke. Excessive temperatures may be caused by a lack of cooling air or
operating the machine beyond its duty cycle or output
rating. If excessive operating temperatures should
occur, the thermostats will prevent output from the
machine. The yellow thermal light, located on the front
of the machine, will be illuminated. The 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.
PROTECTIVE CIRCUITS
Protective circuits are designed into the V350-PRO to
sense trouble and shut down the machine before
damage occurs to the machine's internal components.
OVER CURRENT
PROTECTION
If the average current exceeds 450 amps for one second, then the output will be limited to 100 amps until
the load is removed. If the peak current exceeds 600
amps for 150 ms, the output will be limited to 100
amps until the load is removed.
UNDER/OVER VOLTAGE PROTECTION
Protective circuits are included on the switch and control boards to monitor the voltage across the input
capacitors. In the event that a capacitor pair voltage
is too high, or too low, the machine output will be disabled. The protection circuits will prevent output if any
of the following conditions exist.
1. Voltage across a capacitor pair exceeds 467
volts. (High line surges or improper input voltage
connections.)
2. Voltage across a capacitor pair is under 190 volts.
(Due to improper input voltage connections.)
3. Internal component damage.
THEORY OF OPERATION
E-6 E-6
V350-PRO
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INSULATED GATE BIPOLAR
TRANSISTOR (IGBT)
OPERATION
An IGBT is a type of transistor. IGBT are semiconductors well suited for high frequency switching and high
current applications.
Example A in Figure E.6 shows an IGBT in passive
mode. There is no gate signal, zero volts relative to the
source, and therefore, no current flow. The drain terminal of the IGBT may be connected to a voltage supply; but since there is no conduction, the circuit will not
supply current to components connected to the
source. The circuit is turned OFF like a light switch.
Example B shows the IGBT in an active mode. When
the gate signal , a positive DC voltage relative to the
source, is applied to the gate terminal of the IGBT, it is
capable of conducting current. A voltage supply connected to the drain terminal will allow the IGBT to conduct and supply current to the circuit components
coupled to the source. Current will flow through the
conducting IGBT to downstream components as long
as the positive gate signal is present. This is similar to
turning ON a light switch.
THEORY OF OPERATION
E-7 E-7
V350-PRO
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FIGURE E.6 – IGBT
SOURCE
n + n +
p
n -
n +
p +
DRAIN
A. PASSIVE
GATE
BODY REGION
DRAIN DRIFT REGION
BUFFER LAYER
INJECTING LAYER
SOURCE
n + n +
p
n -
n +
p +
DRAIN
B. ACTIVE
POSITIVE
VOLTAGE
APPLIED
GATE
BODY REGION
DRAIN DRIFT REGION
BUFFER LAYER
INJECTING LAYER
PULSE WIDTH
MODULATION
The term Pulse Width Modulation is used to describe
how much time is devoted to conduction in the positive and negative portions of the cycle. Changing the
pulse width is known as modulation. Pulse Width
Modulation (PWM) is the varying of the pulse width
over the allowed range of a cycle to affect the output
of the machine.
MINIMUM OUTPUT
By controlling the duration of the gate signal, the IGBT
is turned on and off for different durations during the
cycle. The top drawing in Figure E.7 shows the minimum output signal possible over a 50-microsecond
time period.
The positive portion of the signal represents one IGBT
group1conducting for one microsecond. The negative
portion is the other IGBT group1. The dwell time (off
time) is 48 microseconds (both IGBT groups off). Since
only two microseconds of the 50-microsecond time
period is devoted to conducting, the output power is
minimized.
MAXIMUM OUTPUT
By holding the gate signal on for 24 microseconds
each, and allowing only two microseconds of dwell
time (off time) during the 50-microsecond cycle, the
output is maximized. The darkened area under the top
curve can be compared to the area under the bottom
curve. The more dark area that is under the curve indicates that more power is present.
1
An IGBT group consists of two IGBT
modules feeding one transformer primary
winding.
THEORY OF OPERATION
E-8 E-8
V350-PRO
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FIGURE E.7 — TYPICAL IGBT OUTPUTS.
sec
24
sec
2
48
MINIMUM OUTPUT
sec
MAXIMUM OUTPUT
sec
sec
50
sec
24
sec
50
sec
V350-PRO
Section F-1 Section F-1
Troubleshooting & Repair Section.................................................................................Section F
How to Use Troubleshooting Guide ....................................................................................F-2
PC Board Troubleshooting Procedures and Replacement .................................................F-3
Troubleshooting Guide ........................................................................................................F-4
Test Procedures
Input Filter Capacitor Discharge Procedure .................................................................F-15
Main Switch Board Test ................................................................................................F-17
Input Rectifier Test ........................................................................................................F-21
Power Board Test ..........................................................................................................F-25
Output Diode Modules Test ..........................................................................................F-29
Auxiliary Transformer Test .............................................................................................F-33
Current Transducer Test ................................................................................................F-37
Fan Control and Motor Test ..........................................................................................F-41
SPI Cable Resistance and Voltage Test........................................................................F-45
Voltage and Current Calibration Procedure ..................................................................F-47
Replacement Procedures
Control Board Removal and Replacement ...................................................................F-51
Display Board Removal and Replacement ...................................................................F-55
Main Switch Board Removal and Replacement ...........................................................F-59
Advanced Process Panel Removal and Replacement .................................................F-63
Remote Board Removal and Replacement ..................................................................F-69
Snubber Board Removal and Replacement .................................................................F-73
Power Board Removal and Replacement.....................................................................F-75
Input Rectifier Removal and Replacement ...................................................................F-79
Output Rectifier Modules Removal and Replacement .................................................F-83
Current Transducer Removal and Replacement...........................................................F-87
Retest after Repair ........................................................................................................F-92
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION
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HOW TO USE TROUBLESHOOTING GUIDE
Service and repair should be performed by only Lincoln Electric Factory Trained Personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician and machine
operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please
observe all safety notes and precautions detailed throughout this manual.
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V350-PRO
TROUBLESHOOTING & REPAIR
F-2 F-2
CAUTION
CAUTION
This Troubleshooting Guide is provided to help
you locate and repair possible machine
malfunctions. Simply follow the three-step
procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM). Look
under the column labeled “PROBLEM
(SYMPTOMS)”. This column describes possible
symptoms that the machine may exhibit. Find
the listing that best describes the symptom that
the machine is exhibiting. Symptoms are
grouped into three main categories: Output
Problems, Function Problems, and LED Function
Problems.
Step 2. PERFORM EXTERNAL TESTS. The
second column, labeled “POSSIBLE AREAS OF
MISADJUSTMENT(S)”, lists the obvious external
possibilities that may contribute to the machine
symptom. Perform these tests/checks in the
order listed. In general, these tests can be
conducted without removing the case
wrap-around cover.
Step 3. PERFORM COMPONENT TESTS. The
last column, labeled “Recommended Course of
Action” lists the most likely components that may
have failed in your machine. It also specifies the
appropriate test procedure to verify that the
subject component is either good or bad. If there
are a number of possible components, check the
components in the order listed to eliminate one
possibility at a time until you locate the cause of
your problem.
All of the referenced test procedures referred to in
the Troubleshooting Guide are described in detail
at the end of this chapter. Refer to the
Troubleshooting and Repair Table of Contents to
locate each specific Test Procedure. All of the
referred to test points, components, terminal
strips, etc., can be found on the referenced
electrical wiring diagrams and schematics. Refer
to the Electrical Diagrams Section Table of
Contents to locate the appropriate diagram.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs
safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before
you proceed. Call 1-800-833-9353.(WELD)
V350-PRO
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TROUBLESHOOTING & REPAIR
F-3 F-3
Sometimes machine failures appear to be due to PC
board failures. These problems can sometimes be
traced to poor electrical connections. To avoid problems when troubleshooting and replacing PC boards,
please use the following procedure:
1. Determine to the best of your technical ability
that the PC board is the most likely component
causing the failure symptom.
2. Check for loose connections at the PC board to
assure that the PC board is properly connected.
3. If the problem persists, replace the suspect PC
board using standard practices to avoid static
electrical damage and electrical shock. Read
the warning inside the static resistant bag and
perform the following procedures:
PC board can be damaged by static electricity.
- Remove your body’s static
charge before opening the staticshielding bag. Wear an anti-static
wrist strap. For safety, use a 1
Meg ohm resistive cord connected
to a grounded part of the
equipment frame.
- If you don’t have a wrist strap,
touch an un-painted, grounded,
part of the equipment frame. Keep
touching the frame to prevent
static build-up. Be sure not to
touch any electrically live parts at
the same time.
- Tools which come in contact with the PC board must
be either conductive, anti-static or static-dissipative.
ELECTRIC SHOCK
can kill.
•
Have an electrician install and
service this equipment. Turn the
input power OFF at the fuse box
before working on equipment. Do
not touch electrically hot parts.
- Remove the PC board from the static-shielding bag
and place it directly into the equipment. Don’t set the
PC board on or near paper, plastic or cloth which
could have a static charge. If the PC board can’t be
installed immediately, put it back in the static-shielding bag.
- If the PC board uses protective shorting jumpers,
don’t remove them until installation is complete.
- If you return a PC board to The Lincoln Electric
Company for credit, it must be in the static-shielding
bag. This will prevent further damage and allow proper failure analysis.
4. Test the machine to determine if the failure
symptom has been corrected by the
replacement PC board.
NOTE: It is desirable to have a spare (known good)
PC board available for PC board troubleshooting.
NOTE
: Allow the machine to heat up so that all
electrical components can reach their operating
temperature.
5. Remove the replacement PC board and
substitute it with the original PC board to
recreate the original problem.
a. If the original problem does not reappear by
substituting the original board, then the PC
board was not the problem. Continue to look
for bad connections in the control wiring
harness, junction blocks, and terminal strips.
b. If the original problem is recreated by the
substitution of the original board, then the PC
board was the problem. Reinstall the
replacement PC board and test the machine.
6. Always indicate that this procedure was
followed when warranty reports are to be
submitted.
NOTE
: Following this procedure and writing on the
warranty report, “INSTALLED AND SWITCHED PC
BOARDS TO VERIFY PROBLEM,” will help avoid
denial of legitimate PC board warranty claims.
PC BOARD TROUBLESHOOTING PROCEDURES
ATTENTION
Static-Sensitive
Devices
Handle only at
Static-Safe
Workstations
WARNING
CAUTION
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V350-PRO
TROUBLESHOOTING & REPAIR
F-4 F-4
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Major physical or electrical damage is evident when the sheet metal cover is removed.
1. Contact your local authorized
Lincoln Electric Field Service
Facility for technical assistance.
1. Contact the Lincoln Electric
Service Department,
1-800-833-9353(WELD).
The machine is dead—no output— no displays.
1. Make sure the input line/breaker
switch is in the ON position.
2. Check the 3.5 amp circuit break-
er (CB3). Reset if tripped.
3. Check the main input line fuses.
If open , replace.
4. Check the 3.5 amp circuit breaker (CB2). Reset if tripped.
5. Check the 6 amp circuit breaker
(CB1). Reset if tripped.
6. Make sure the reconnect switch
and jumper lead is configured
correctly for the applied input
voltage.
7. If the machine is being operated
with single phase input voltage
make sure the red lead is not
connected. See the Installation
Section.
1. Perform the Auxiliary
Transformer Test.
2. Perform the Power Board Test.
3. The control rectifier and or associated filter capacitor (C5) may
be faulty. Check and replace as
necessary.
4. Perform The SPI Cable
Resistance and Voltage Test.
5. The Control Board may be faulty.
The main input fuses (or breaker) repeatedly fail.
1. Make certain the fuses or breakers are sized properly.
2. Make sure the reconnect switch
and jumper lead is configured
correctly for the applied input
voltage.
3. The welding procedure may be
drawing too much input current
or the duty cycle may be too
high. Reduce the welding current and /or reduce the duty
cycle.
1. Check the reconnect switches
and associated wiring. See the
Wiring Diagram.
2. Perform the Input Rectifier
Test.
3. Perform the Main Switch Board
Test.
4. Perform the Output Diode
Module Test.
5. The Input Filter Capacitors may
be faulty. Check, and if any are
faulty replace all four.
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V350-PRO
TROUBLESHOOTING & REPAIR
F-5 F-5
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call 1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The V350-Pro does not have welding output. The displays are lit.
1. Make sure the reconnect switch
is configured correctly for the
input voltage applied.
2. Make sure the Weld Terminals
Select is ON. If the problem is
solved the remote control
device or associated circuitry
may be faulty. See the wiring
diagram.
3. Put the Control Select in the
Local position. If the problem is
solved the remote control
device or associated circuitry
may be faulty.
4. If an error code is displayed see
Fault Code Explanations.
1. Check the reconnect switch and
associated leads for loose or
faulty connections. See the
wiring diagram.
2. Perform the Main Switch
Board Test.
3. Perform the Power Board
Test.
4. Perform the Output Diode
Module Test.
5. The control board may be faulty.
6. The input filter capacitors may
be faulty. Check and replace if
necessary.
7. The remote board may be
faulty.
The V350-Pro will not produce full output.
1. The input voltage may be too
low, limiting the output capability of the machine. Make certain the input voltage is correct
for the machine and the reconnect switch and jumper lead
configuration.
2. The welding current may be too
high . The machine will fold
back to 100 amps if the welding current exceeds 450 amps.
3. Make sure the machine is in
"Local" output control.. If the
problem is resolved the Remote
control board or the external
remote control unit may be
faulty.
1. Perform the Output Rectifier
Test.
2. Perform the Main Switch
Board Test.
3. Perform the Power Board
Test.
4. Perform the Current
Transducer Test.
5. If the preset function is not
performing properly the status
panel board or the output
control may be faulty.
6. The control board may be
faulty.
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V350-PRO
TROUBLESHOOTING & REPAIR
F-6 F-6
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The machine regularly overheats and the yellow thermal light is ON indicating a thermal overload.
1. Check the 3.5 amp circuit
breaker (CB2). Reset if tripped.
2. The welding application may
be exceeding the
recommended duty cycle of the
V350-Pro.
3. Dirt and dust may have clogged
the cooling channels inside the
machine.
4. Air intake and exhaust louvers
may be blocked due to inadequate clearance around the
machine.
5. Make certain the fan as needed
(F.A.N.) is operating properly.
The fan should operate when
welding voltage is present
and/or when there is an over
temperature condition.
1. The 115VAC fan motor is controlled by the control board via
the main switch board. Perform
the Fan Motor And Control
Test.
1. A thermostat or associated circuitry may be faulty. See the
wiring diagram. One normally
closed thermostat is located on
the output choke and the other
is located on the main switch
board heat sink. See the wiring
diagram.
Note: The Main Switch Board
Removal Procedure will be
required to gain access to
the heat sink thermostat.
An attached wire feeder will not function correctly.
1. Make certain the wire feeder
control cable is connected to
the correct 14-pin amphenol
type plug (115VAC or
24/42VAC) for the wire feeder
being used. See the connection
diagram. If wirefeeder has DIP
switch, be sure it is set correctly.
2. Check the two circuit breakers
located at the rear of the
machine. Reset if tripped.
3. The wire feeder or control cable
may be faulty.
1. Perform the Auxiliary
Transformer Test.
2. Check the leads between the
14-pin amphenol type plugs and
the auxiliary transformer for
loose or faulty connections.
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V350-PRO
TROUBLESHOOTING & REPAIR
F-7 F-7
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call 1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The machine’s welding output is very high and uncontrollable.
1. Put the Control Select in the
Local position. If the problem is
solved the remote control
device or associated circuitry
may be faulty.
2. Check for proper current and
voltage calibration.
1. Perform the Current
Transducer Test.
2. If the output is normal when
the Control Select is in the Local
position but the output is very
high in the Remote position the
remote board may be faulty.
Perform The SPI Cable
Resistance and Voltage Test.
3. The control board may be faulty.
The Weld Mode Select does not function properly.
1. Refer to Operation Section of
this manual for normal operation
characteristics.
NOTE: The mode panel is not pre-
sent if the advanced
process panel is installed.
1. Check for loose or faulty plug
connections between the control board and the mode select
panel. See the wiring diagram.
2. Perform the SPI Cable
Resistance and Voltage Test.
3. The Mode Select Panel board
may be faulty.
4. The control board may be faulty.
The output control and/or Weld Terminals Select functions do not operate properly.
1. Refer to Operation Section of
this manual for normal operation
characteristics.
2. Check for proper current and
voltage calibration.
1. Check for loose or faulty plug
connections between the
remote board and the weld/output controls. See the wiring diagram.
2. The Remote Board may be
faulty.
3. The control board may be faulty.
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V350-PRO
TROUBLESHOOTING & REPAIR
F-8 F-8
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call 1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The display is not functioning properly.
1. Refer to the Operation Section
of this manual for normal operation characteristics.
2. Check for proper current and
voltage calibration.
1. Check for loose or faulty plug
connections between the
Display board and the control
board. See the wiring diagram.
2. The display board may be faulty.
3. The control board may be faulty.
A fault or error code is displayed. 1. See the Fault Code
Explanations.
1. See Fault Code Explanations.
For no apparent reason the welding characteristics have change.
1. Check the welding cables for
loose or faulty connection.
2. Make sure the machine’s mode
and output are set correctly for
the process being used. (CV,
CC,TIG etc.)
3. If Mig welding make sure the
shielding gas and wire speed are
correct for the process being
used.
4. Check for proper current and
voltage calibration.
1. Perform the Voltage and
Current Calibration
Procedure.
2. Perform the Current
Transducer Test.
3. Perform the Output Diode
Module Test
4. The control board may be faulty.
5. The advanced process panel (If
used) may be faulty.
SERVICE FACILITY
CORRECTIVE
ACTION
CORRECTIVE
ACTION
DESCRIPTION/
DEFINITION
31
32
Main transformer
primary over current
Capacitor bank “A”
(lower) is under
voltage
Turn the machine off and
back on to reset the
machine. If condition
persists, contact an
authorized Lincoln Field
Service Facility.
Make sure the reconnect
switches are configured
for the input voltage
being applied to the
machine. The machine
is self clearing when
condition ceases.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
There may be a problem
with the primary current
sensors (CT) located on
the main switch board.
See the Wiring diagram
The control board may
be faulty.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
TROUBLESHOOTING & REPAIR
F-9 F-9
V350-PRO
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FAULT CODES
NOTE: If more than one fault message is being displayed, perform all the checks for the faults
before replacing the printed circuit board
V350-PRO
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SERVICE FACILITY
CORRECTIVE
ACTION
CORRECTIVE
ACTION
DESCRIPTION/
DEFINITION
33
34
Capacitor bank
"B"(upper) is under
voltage.
Capacitor bank
"A"(lower) is over
voltage.
Make sure the reconnect
switches are configured
for the input voltage
being applied to the
machine. The machine
is self-clearing when
condition ceases.
Make sure the reconnect
switches are configured
for the input voltage
being applied to the
machine. The machine
is self-clearing when
condition ceases.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
TROUBLESHOOTING & REPAIR
F-10 F-10
FAULT CODES
NOTE: If more than one fault message is being displayed, perform all the checks for the faults
before replacing the printed circuit board
V350-PRO
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SERVICE FACILITY
CORRECTIVE
ACTION
CORRECTIVE
ACTION
DESCRIPTION/
DEFINITION
35
37
Capacitor bank
"B"(lower) is over
voltage.
The soft start
function failed.
Make sure the reconnect
switches are configured
for the input voltage
being applied to the
machine. The machine
is self-clearing when
condition ceases.
Turn the machine off and
back on to reset the
machine.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
TROUBLESHOOTING & REPAIR
F-11 F-11
FAULT CODES
NOTE: If more than one fault message is being displayed, perform all the checks for the faults
before replacing the printed circuit board
V350-PRO
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SERVICE FACILITY
CORRECTIVE
ACTION
CORRECTIVE
ACTION
DESCRIPTION/
DEFINITION
39
43
44
Electrical "glitch" on the
primary over current fault
detector circuit.
Capacitor banks "A"
(lower) and "B"(upper)
are not balanced.
The machine has
detected a fault in the
central processing unit
(CPU).
Possibly caused by an
external electrical
"noise" or signal level.
Make sure the V350-Pro
is grounded correctly.
The machine is self
clearing when
condition ceases.
Make sure the reconnect switches are configured for the input
voltage being applied to
the machine. The
machine is self-clearing
when
condition ceases.
Make sure the V350-Pro
is grounded correctly.
The machine is self
clearing when
condition ceases.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
There may be a problem
with the primary current
sensors (CT) located on
the main switch board.
See the wiring diagram.
The control board may
be faulty.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
The capacitor(s) may be
faulty. Check and
replace if necessary.
Perform the Power
Board Test.
The control board or
associated wiring may be
faulty. See the wiring
diagram.
TROUBLESHOOTING & REPAIR
F-12 F-12
FAULT CODES
NOTE: If more than one fault message is being displayed, perform all the checks for the faults
before replacing the printed circuit board
V350-PRO
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SERVICE FACILITY
CORRECTIVE
ACTION
CORRECTIVE
ACTION
DESCRIPTION/
DEFINITION
47
“bad node” “####”
Electrical "glitch" on the
V/F signals from the main
switch board to the
control board.
The selected weld mode
does not exist in the weld
table that is presently
loaded in the machine.
Possibly caused by an
external electrical
"noise" or signal level.
Make sure the V350-Pro
is grounded correctly.
The machine is self
clearing when condition
ceases.
Press the Mode Select
button to select a
different welding mode.
There may be a problem
with the V/F signals from
the main switch board to
the control board.
Perform the Main Switch
Board Test.
Perform the Power
Board Test.
The control board may
be faulty.
If new software was just
installed, try reinstalling
the software or put the
original software back.
Perform the Power
Board Test.
Perform the SPI Cable
Resistance and Voltage
Test.
The control board may
be faulty.
TROUBLESHOOTING & REPAIR
F-13 F-13
FAULT CODES
NOTE: If more than one fault message is being displayed, perform all the checks for the faults
before replacing the printed circuit board
NOTES
F-14 F-14
V350-PRO
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WARNING
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TROUBLESHOOTING & REPAIR
F-15 F-15
V350-PRO
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE
Service and repair should be performed by only Lincoln Electric factory trained
personnel. Unauthorized repairs performed on this equipment may result in danger to
the technician or machine operator and will invalidate your factory warranty. For your
safety and to avoid electrical shock, please observe all safety notes and precautions
detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This procedure will drain off any charge stored in the four large capacitors that are part
of the switch board assembly. This procedure MUST be performed, as a safety precaution, before conducting any test or repair procedure that requires you to touch inter-
nal components of the machine.
MATERIALS NEEDED
5/16” Nut Driver
Insulated Pliers
Insulated Gloves
High Wattage Resistor (25-1000 ohms and 25 watts minimum)
DC Volt Meter
This procedure takes approximately 20 minutes to perform.
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TROUBLESHOOTING & REPAIR
F-16 F-16
V350-PRO
ELECTRIC SHOCK can kill.
• Have an electrician install and service
this equipment.
• Turn the input power off at the fuse box
before working on equipment.
• Do not touch electrically hot parts.
• Prior to performing preventative maintenance,
perform the following capacitor discharge procedure
to avoid electric shock.
DISCHARGE PROCEDURE
1. Remove the input power to the V350-PRO.
2. Using the 5/16” wrench remove the screws from
the case wraparound cover.
3. Be careful not to make contact with the capacitor
terminals located at the top and bottom of the
switch board.
4. Obtain a high resistance and high wattage resistor
(25-1000 ohms and 25 watts minimum). This
resistor is not with the machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
5. Locate the eight capacitor terminals shown in figure F.1.
6. Using electrically insulated gloves and pliers, hold
the body of the resistor with the pliers and connect the resistor leads across the two capacitor
terminals. Hold the resistor in place for 10 seconds. DO NOT TOUCH CAPACITOR TERMINALS
WITH YOUR BARE HANDS.
7. Repeat the discharge procedure for the other
three capacitors.
8. Check the voltage across the terminals of all
capacitors with a DC voltmeter. Polarity of the
capacitor terminals is marked on the PC board
above the terminals. Voltage should be zero. If
any voltage remains, repeat this capacitor dis-
charge procedure.
WARNING
FIGURE F.1 – LOCATION OF INPUT FILTER CAPACITOR TERMINALS
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)
CAPACITOR
TERMINALS
- +
- +
POWER
RESISTOR
EIGHT
- +
INSULATED
PLIERS
- +
INSULATED
GLOVES
MAIN SWITCH BOARD TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the “power section” of the switch boards are functioning correctly. This test will NOT indicate if the entire PC board is functional. This resistance test is
preferable to a voltage test with the machine energized because this board can be damaged
easily. In addition, it is dangerous to work on this board with the machine energized.
MATERIALS NEEDED
Analog Volt/Ohmmeter
5/16 in. Wrench
7/16 in. Wrench
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TROUBLESHOOTING & REPAIR
F-17 F-17
V350-PRO
WARNING
This procedure takes approximately 30 minutes to perform.
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TROUBLESHOOTING & REPAIR
F-18 F-18
V350-PRO
MAIN SWITCH BOARD TEST (continued)
FIGURE F.2 MAIN SWITCH BOARD LEAD LOCATIONS
TEST PROCEDURE
1. Remove input power to the V350-PRO.
2. Using a 5/16” nut driver, remove the case
wraparound.
3. Perform the Input Filter Capacitor Discharge
Procedure detailed earlier in this section.
4. Using a 7/16” wrench locate, label and remove
leads 201, 202, 203, 204, 205, 206, 207 and
208 from the switch board. Note lead and
washer placement for reassembly. Clear
leads.
5. Using the Analog ohmmeter, perform the resistance tests detailed in Table F.1. Refer to fig-
ure F.2 for test point locations. Note: Test
using an Analog ohmmeter on the Rx1 range.
Make sure the test probes are making electrical contact with the conductor surfaces on the
PC board.
J21
207
- +
201
208
205
- +
204
- + - +
202
J22
209
J20
203
206
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TROUBLESHOOTING & REPAIR
F-19 F-19
V350-PRO
MAIN SWITCH BOARD TEST (continued)
TABLE F.1. SWITCH BOARD RESISTANCE TEST
6. If any test fails replace the switch board. See
Main Switch Board Removal and Replacement.
7. If the switch board resistance tests are OK, check
connections on plugs J20, J21, J22 and all associated wiring. See wiring diagram.
8. Reconnect leads 201, 202, 203, 204, 205, 206,
207, and 208 to the switch board. Ensure that the
leads are installed in their proper locations. PreTo rque all leads nuts to 25 inch lbs. before tightening them to 44 inch lbs.
9. Replace the case wraparound cover using a 5/16”
nut driver.
APPLY POSITIVE TEST
PROBE TO TERMINAL
APPLY NEGATIVE TEST
PROBE TO TERMINAL
NORMAL
RESISTANCE READING
+206
+208
+202
+201
+205
+203
+204
+207
-205
-203
-204
-207
-206
-208
-202
-201
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
NOTES
F-20 F-20
V350-PRO
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TROUBLESHOOTING & REPAIR
F-21 F-21
V350-PRO
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INPUT RECTIFIER TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the input rectifier has “shorted” or “open” diodes.
MATERIALS NEEDED
Analog Voltmeter/Ohmmeter (Multimeter)
5/16” Nut Driver
Phillips Head Screwdriver
Wiring Diagram
WARNING
This procedure takes approximately 25 minutes to perform.
TEST PROCEDURE
1. Remove input power to the V350-PRO
machine.
2. Using a 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Capacitor Discharge
Procedure detailed earlier in this section.
4. Locate the input rectifier and associated
leads. See Figure F.3.
5. Carefully remove the silicone sealant
from leads 207, 207A, and 209.
6. Using a phillips head screwdriver,
remove leads 207, 207A, and 209 from
the input rectifier.
7. Use the analog ohmmeter to perform the
tests detailed in Table F.2. See the
Wiring Diagram.
8. Visually inspect the three MOV’S for
damage (TP1,TP2,TP3). Replace if necessary.
TROUBLESHOOTING & REPAIR
F-22 F-22
V350-PRO
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INPUT RECTIFIER TEST (CONTINUED)
Figure F.3 Input Rectifier
Small Lead "H1"
To Auxiliary Transformer
3/16" ALLEN
BOLTS
C
B
#207
#207A
#209A
FRONT
REAR
Small Lead "A"
To Circuit Breaker
TROUBLESHOOTING & REPAIR
F-23 F-23
V350-PRO
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9. If the input rectifier does not meet the
acceptable readings outlined in Table F.2
the component may be faulty. Replace
Note: Before replacing the input rectifier,
check the input power switch and perform the Main Switch Board Test. Also
check for leaky or faulty filter capacitors.
10. If the input rectifier is good, be sure to
reconnect leads 207, 207A, and 209 to
the correct terminals and torque to 31
inch lbs. Apply silicone sealant.
11. If the input rectifier is faulty, see the
Input Rectifier Bridge Removal &
Replacement procedure.
12. Replace the case wraparound cover.
INPUT RECTIFIER TEST (CONTINUED)
Table F.2 Input Rectifier Test Points
TEST POINT TERMINALS
ANALOG METER
X10 RANGE
A
B
C
A
B
C
A
B
C
207
207
207
207A
207A
207A
209
209
209
207
207
207
207A
207A
207A
209
209
209
A
B
C
A
B
C
A
B
C
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
+ PROBE
- PROBE
Acceptable Meter Readings
NOTES
F-24 F-24
V350-PRO
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F-25 F-25
V350-PRO
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TROUBLESHOOTING & REPAIR
POWER BOARD TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the power board is receiving the correct voltages and also if
the power board is regulating and producing the correct DC voltages.
MATERIALS NEEDED
Volt-Ohmmeter
5/16” Nut Driver
Wiring Diagram
WARNING
This procedure takes approximately 30 minutes to perform.
TEST PROCEDURE
1. Remove input power to the V350-PRO
machine.
2. Using a 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Capacitor Discharge
Procedure detailed earlier in this section.
4. Locate the power board and plugs J41, J42
and J43. Do not remove plugs from the
power board. See Figure F.4.
5. Carefully apply the correct input voltage to
the V350-PRO.
6. Carefully test for the correct voltages at the
power board. See Table F.3.
7. If the 40VDC is low, or not present at plug
J41, check the rectifier bridge and C5 filter
capacitor. See Wiring Diagram. Also perform the Auxiliary Transformer Test.
8. If any of the DC voltages are low, or not
present at plugs J42 or J43, the power
board may be faulty.
9. Remove the input power to the V350-PRO.
10. Replace the case wraparound cover using
a 5/16” nut driver.
TROUBLESHOOTING & REPAIR
F-26 F-26
V350-PRO
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POWER BOARD TEST (CONTINUED)
Figure F.4 Power Board Plug Location
J42
J41
J43
TROUBLESHOOTING & REPAIR
F-27 F-27
V350-PRO
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POWER BOARD TEST (CONTINUED)
Table F.3 Power Board Voltage Checks
CHECK POINT
LOCATION
TEST
DESCRIPTION
CONNECTOR
PLUG PIN NO.
LEAD NO.
OR IDENTITY
NORMAL
ACCEPTABLE
VOLTAGE
READING
POWER PC
BOARD
CONNECTOR
PLUG J41
POWER PC
BOARD
CONNECTOR
PLUG J42
POWER PC
BOARD
CONNECTOR
PLUG J42
POWER PC
BOARD
CONNECTOR
PLUG J42
POWER PC
BOARD
CONNECTOR
PLUG J43
POWER PC
BOARD
CONNECTOR
PLUG J43
POWER PC
BOARD
CONNECTOR
PLUG J43
CHECK +5VDC
SUPPLY FROM
POWER PC
BOARD
CHECK -15VDC
SUPPLY FROM
POWER PC
BOARD
CHECK +5VDC
“SPI” SUPPLY
FROM POWER
PC BOARD
CHECK +5VDC
“RS232”
SUPPLY FROM
POWER PC
BOARD
CHECK +15VDC
“SPI” SUPPLY
FROM POWER
PC BOARD
408 (+)
410 (-)
411 (+)
410 (-)
403 (+)
401 (-)
406 (+)
405 (-)
402 (+)
401 (-)
5 VDC
-15 VDC
5 VDC
5 VDC
15 VDC
CHECK +15VDC
SUPPLY FROM
POWER PC
BOARD
412 (+)
410 (-)
15 VDC
CHECK 40VDC
SUPPLY FROM
RECT. BRIDGE
TO POWER BD.
65 (+)
66 (-)
38-42 VDC
65
408
401
401
402
3(+)
5(-)
2(+)
5(-)
3(+)
12(-)
4(+)
9(-)
406
2(+)
1(-)
1(+)
5(-)
6(+)
12(-)
403
410
410
410
405
66
412
411
NOTES
F-28 F-28
V350-PRO
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OUTPUT DIODE MODULES TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if any of the output diodes are “shorted”.
MATERIALS NEEDED
Analog Voltmeter/Ohmmeter
Wiring Diagram
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TROUBLESHOOTING & REPAIR
F-29 F-29
V350-PRO
WARNING
This procedure takes approximately 20 minutes to perform.
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TROUBLESHOOTING & REPAIR
F-30 F-30
V350-PRO
OUTPUT DIODE MODULES TEST (continued)
TEST PROCEDURE
1. Remove input power to the V350-PRO.
2. Locate the output terminals on the front
panel of the machine. See Figure F.5.
3. Remove any output cables and load from the
output terminals.
4. Using the analog ohmmeter test for more
than 200 ohms resistance between positive
and negative output terminals. Positive test
lead to the positive terminal; Negative test
lead to the negative terminal. See Figure
F.6.
NOTE: The polarity of the test leads is most
important. If the test leads polarity is not correct, the test will have erroneous results.
FIGURE F.5 Machine Output Terminals
REMOTE
ON
REMOTE
LOCAL
MEMOR
BUTTONON
SELECT
TTRIBUTE
ADJUST
TTRIBUTE
SELECT
KNOB
A
MPS
OLTS
V
_
NEGATIVE
OUTPUT
TERMINAL
SELECT
WELD TERMINALS
REMOTE
ATTRIBUTE
ON
ADJUST
ATTRIBUTE
CONTROL
REMOTE
LOCAL
SELECT SELECT
MEMOR
Y BUTT
SELECT
OUTPUT
KNOB
+
POSITIVE
OUTPUT
TERMINAL
TROUBLESHOOTING & REPAIR
F-31 F-31
V350-PRO
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OUTPUT DIODE MODULES TEST (continued)
5. If 200 ohms is measured then the output
diodes are not “shorted”.
NOTE: There is a 250 ohm resistor across the
welding output terminals.
6. If less than 200 ohms is measured, one or
more diodes or the snubber board may be
faulty.
7. Perform the Filter Capacitor Discharge
Procedure detailed earlier in this section.
8. Locate the output diode modules and snubber board. See Figure F.7.
9. Test all output diode modules individually.
NOTE: This may require the disassembly of
the leads and the snubber board from the
diode modules. Refer to the Output Diode
Modules Removal and Replacement
Procedure for detailed instructions.
Figure F.6 Terminal Probes
_
+ PROBE
- PROBE
+
TROUBLESHOOTING & REPAIR
OUTPUT DIODE MODULES TEST (continued)
F-32 F-32
V350-PRO
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Figure F.7 Snubber and Output Diode Locations
Output Diode
Modules
Snubber
Board
LEFT SIDE
AUXILIARY TRANSFORMER TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This procedure will determine if the correct voltage is being applied to the primary of auxiliary transformer and also if the correct voltage is being induced on the secondary windings
of the transformer.
MATERIALS NEEDED
Volt-ohmmeter (Multimeter)
5/16” Nut Driver
Wiring Diagram
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TROUBLESHOOTING & REPAIR
F-33 F-33
V350-PRO
WARNING
This procedure takes approximately 25 minutes to perform.
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TROUBLESHOOTING & REPAIR
F-34 F-34
V350-PRO
AUXILIARY TRANSFORMER TEST (continued)
TEST PROCEDURE
1. Remove input power to the V350-PRO.
2. Using a 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Input Capacitor Discharge
Procedure detailed earlier in this section.
4. Locate the auxiliary transformer. See Figure
F.8.
5. Locate the secondary leads and plug P52.
See Figure F.8 and F.9.
FIGURE F.8 Auxiliary Transformer
FIGURE F.9 Plug Lead Connections Viewed From Transformer Lead Side of Plug
WARNING
REMOTE
POWER
OFF
ON
A
AMPS
A
V
VOLTS
W
E
LD
T
E
R
M
IN
A
LS
S
E
LE
C
T
OUTPUT
HO
T STAR
T
ARC
CO
NTROL
-4 +4
+2
-2
0
-6 +6
-10
SOFT
CRISP
+10
-8
+8
5
4
3
2
1
0
6
10
9
8
7
SELECT
CC-STICK 7018
CC-STICK 6010
TIG GTAW
CV-WIRE
CV-FLUX CORED
Auxiliary
Transformer
Secondary Lead
Plugs P52
532
2
1
10
9
3
11
31
42
5
4
12
13
Plug P52
24
678
161514
54
541
TROUBLESHOOTING & REPAIR
AUXILIARY TRANSFORMER NO.1 TEST (continued)
F-35 F-35
V350-PRO
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7. Carefully apply the correct input voltage to the
V350-PRO and check for the correct secondary voltages per table F.4. Make sure the
reconnect jumper lead and switch are configured correctly for the input voltage being
applied. Make sure circuit breaker (CB3) is
functioning properly.
NOTE: The secondary voltages will vary if the
input line voltage varies.
8. If the correct secondary voltages are present,
the auxiliary transformer is functioning properly. If any of the secondary voltages are missing or low, check to make certain the primary
is configured correctly for the input voltage
applied. See Wiring Diagram.
High voltage is present at primary of
Auxiliary Transformer.
9. If the correct input voltage is applied to the
primary, and the secondary voltage(s) are not
correct, the auxiliary transformer may be
faulty.
10. Remove the input power to the V350-PRO.
11. Install the case wraparound cover using a
5/16” nut driver.
TABLE F.4
WARNING
LEAD IDENTIFICATION
NORMAL EXPECTED VOLTAGE
31 TO 532
115 VAC
42 TO 541
24 TO 541
42 VAC
24 VAC
28 VAC
54 TO 541
NOTES
F-36 F-36
V350-PRO
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TROUBLESHOOTING AND REPAIR
F-37 F-37
V350-PRO
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CURRENT TRANSDUCER TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the current transducer and associated wiring are functioning
correctly.
MATERIALS NEEDED
Volt-ohmmeter
5/16” Nut Driver
Resistive Load Bank
External DC Ammeter
This procedure takes approximately 45 minutes to perform.
WARNING
TROUBLESHOOTING AND REPAIR
CURRENT TRANSDUCER TEST (continued)
F-38 F-38
V350-PRO
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TEST PROCEDURE
1. Remove input power to the V350-PRO.
2. Using the 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Input Capacitor Discharge
Procedure.
4. Locate plug J8 on the control board. Do not
remove the plug from the P.C. Board.
5. Apply the correct input power to the V350PRO.
6. Check for the correct DC supply voltages to
the current transducer at plug J8. See Figure
F.11.
A. Pin 2 (lead 802+) to pin 6 (lead 806-)
should read +15 VDC.
B. Pin 4 (lead 804+) to pin 6 (lead 806-)
should read -15 VDC.
7. If either of the supply voltages are low or missing, the control board may be faulty.
FIGURE F.10 Metal Plate Removal & Plug J8 Location
FIGURE F.11. Plug J8 Viewed From Lead Side of Plug
A
AMPS
V
VOLTS
A
CC
OUTPUT
-STICK 7018
C
C-STICK 6010
TIG
G
TAW
C
V-W
IR
E
CV-FLU
X CO
WARNING
W
E
LD
T
ER
M
IN
ALS
HOT START
SE
LE
RED
REMOTE
C
T
4
5
3
SELEC
6
ARC CONTROL
2
T
7
1
-2
0
8
-4 +4
0
+2
-6 +6
9
10
-8
-10
SOFT
+8
+10
CRISP
POWER
ON
OFF
802
801
Plug J8
804
Plug J8
806
TROUBLESHOOTING AND REPAIR
CURRENT TRANSDUCER TEST (continued)
F-39 F-39
V350-PRO
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8. Check the feedback voltage from the current
transducer using a resistive load bank and
with the V350-PRO in mode 200. Mode 200 is
a constant current test mode. This mode can
be accessed from the front panel of the V350
by pressing and holding the Mode Select button while turning the machine on. NOTE:
Machines with an Advanced Process Panels
do not have a mode select button. Use the
same procedure except hold in the Memory
button on the advanced process panel instead
of the mode select button. Then, rotate the
output knob while still holding the Mode Select
button in until the displays read “Mode 200”.
Release the Mode Select Button and the
machine will be in mode 200. With the V350PRO in mode 200, apply the grid load across
the output of the V350-PRO, set machine output to 300 amps and enable WELD TERMINALS. Adjust the grid load to obtain 300
amps on the external ammeter and check
feedback voltages per Table F.5.
A. Pin 1 (lead 801) to Pin 6 (lead 806) should
read 2.4 VDC (machine loaded to 300
amps).
9. If for any reason the machine cannot be
loaded to 300 amps, Table F.5. shows what
feedback voltage is produced at various current loads.
10. If the correct supply voltages are applied to
the current transducer, and with the machine
loaded, the feedback voltage is missing or not
correct the current transducer may be faulty.
Before replacing the current transducer, check
the leads and plugs between the control board
(J8) and the current transducer (J90). See The
Wiring Diagram. For access to plug J90 and
the current transducer refer to: Current
Transducer Removal and Replacement
Procedure.
11. Remove input power to the V350-PRO.
12. Replace the control box top and any cable ties
previously removed.
13. Install the case wraparound cover using the
5/16” nut driver.
TABLE F.5
OUTPUT LOAD CURRENT
EXPECTED TRANSDUCER FEEDBACK
VOLTAGE
300
250
200
150
100
2.4
2.0
1.6
1.2
0.8
NOTES
F-40 F-40
V350-PRO
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TROUBLESHOOTING AND REPAIR
F-41 F-41
V350-PRO
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FAN CONTROL AND MOTOR TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the fan motor, control board, switch board, or associated leads
and connectors are functioning correctly.
MATERIALS NEEDED
Voltmeter
5/16” Nut Driver
WARNING
This procedure takes approximately 40 minutes to perform.
TROUBLESHOOTING AND REPAIR
FAN CONTROL AND MOTOR TEST (continued)
F-42 F-42
V350-PRO
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TEST PROCEDURE
1. Remove the input power to the V350-PRO
machine.
2. Using the 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Input Filter Capacitor Discharge
Procedure.
4. Locate plug J22 on the main switch board. Do
not remove the plug from the board. See
Figure F.12.
5. Carefully apply the correct input power to the
machine.
6. Carefully check for 115VAC at plug J22 pin-2
to J22 pin-3. (leads 32A to 31B(C) See Figure
F.13. WARNING: HIGH VOLTAGE IS PRE-
SENT AT THE MAIN SWITCH BOARD.
FIGURE F.13 PLUG J22
FIGURE F.12 PLUG J22 LOCATION
J22
J21
Fan Lead
Lead 31B(C)
1
3
J20
2
4
Lead 32A
Fan Lead
Plug J22
TROUBLESHOOTING AND REPAIR
FAN CONTROL AND MOTOR TEST (continued)
F-43 F-43
V350-PRO
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7. If the 115VAC is low or not present check circuit breaker CB2 located on the front panel. If
the circuit breaker is OK, perform The
Auxiliary Transformer Test. Check plug J22,
circuit breaker CB2 and associated leads for
loose or faulty connections. See the Wiring
Diagram.
8. Energize the weld output terminals (Select
Weld Terminals ON) and carefully check for
115VAC at plug J22 pin-1 to J22 pin-4 (fan
leads). See Figure F.13. If the 115VAC is pre-
sent and the fan is not running then the fan
motor may be faulty. Also check the associated leads between plug J22 and the fan motor
for loose or faulty connections. See the Wiring
Diagram. WARNING: HIGH VOLTAGE IS
PRESENT AT THE SWITCH BOARD.
9. If the 115VAC is NOT present in the previous
step then proceed to the fan control test.
FAN CONTROL TEST PROCEDURE
1. Locate plug J20 on the switch board. Do not
remove the plug from the switch board. See
Figure F.12 and F.14.
2. Energize the weld output terminals (Select
Weld Terminals ON) and carefully check for
+15VDC at plug J20 pin-6+ to J20 pin-2(leads 715 to 716). See Figure F.14. If the
15VDC is present and the fan is not running
then the switch board may be faulty. If the
15VDC is not present when the weld terminals
are energized then the control board may be
faulty. Also check plugs J20, J7, and all associated leads for loose or faulty connections.
See the Wiring Diagram.
WARNING: HIGH VOLTAGE IS PRESENT AT
THE SWITCH BOARD.
3. Remove the input power to the V350-PRO.
Note: The fan motor may be accessed by the
removal of the rear panel detailed in The
Current Transducer Removal and
Replacement Procedure.
4. Replace the case wrap-around cover.
FIGURE F.14 PLUG J20
1
Lead 716-
2
65
3
7
Plug J20
4
8
Lead 715+
NOTES
F-44 F-44
V350-PRO
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TROUBLESHOOTING AND REPAIR
F-45 F-45
V350-PRO
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SPI CABLE RESISTANCE AND VOLTAGE TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if there is a possible “open” in the SPI cable and also determine
if the correct supply voltages are being applied to the boards in the SPI network.
MATERIALS NEEDED
Volt/Ohmmeter
5/16” Nut Driver
WARNING
This procedure takes approximately 35 minutes to perform.
TROUBLESHOOTING AND REPAIR
SPI CABLE RESISTANCE AND VOLTAGE TEST (continued)
F-46 F-46
V350-PRO
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TEST PROCEDURE
1. Remove the input power to the V350-PRO.
2. Using the 5/16” nut driver, remove the case
wraparound cover.
3. Perform the Capacitor Discharge Procedure.
4. Perform the Display Board Removal
Procedure. Do not remove the SPI ribbon
cable connecting the display board to the
remote/status boards.
5. Locate and remove plug J3 from the control
board. See Figure F.15.
6. Check the resistance and continuity of the SPI
cable by testing with the ohmmeter from each
pin on plug J3 to the corresponding pins on
plug J34. See the Wiring Diagram.
7. The resistance reading pin to corresponding
pin should be zero ohms or very low resistance. If the resistance reading is high or
“open” check the plug connections to the SPI
network PC boards. If the connections are OK
and the resistance is high or “open” the SPI
cable may be faulty.
8. Reconnect the plug into the control board and
perform the Display Board Replacement
Procedure.
9. With plug J3 still removed from the control
board, carefully apply the correct input power
to V350-PRO.
10. Turn on the machine.
11. Carefully check for the presence of +15VDC
from plug J3 pin -1(+) to plug J3 pin -10(-) at
the control board receptacle. See Figure F.15.
12. Carefully check for the presence of +5VDC
from plug J3 pin -2(+) to plug J3 pin -10(-) at
the control board receptacle. See Figure F.15.
13. If either of these voltages are low or not present, the control board may be faulty. Replace.
Also Perform the Power Board Test.
14. Remove the input power to the V350-PRO
machine.
15. Replace plug J3 into the control board.
16. Replace any cable ties previously removed.
17. Replace the case wrap-around cover.
FIGURE F.15 Plug J3
J3
Pin 1
Pin 2
Plug J3
Pin 10
Right Side
VOLTAGE AND CURRENT CALIBRATION PROCEDURE
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid
electrical shock, please observe all safety notes and precautions detailed throughout this
manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This test will help determine if the machine is capable of producing welding output and to
check and adjust, if necessary, the voltage and or current calibration.
MATERIALS NEEDED
Resistive Load Bank
Calibrated Test Voltmeter
Calibrated Test Ammeter
TROUBLESHOOTING AND REPAIR
F-47 F-47
V350-PRO
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WARNING
This procedure takes approximately 20 minutes to perform.
TROUBLESHOOTING AND REPAIR
VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued)
F-48 F-48
V350-PRO
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CALIBRATION CHECK
The calibration of the V350-PRO can be checked
using a resistive load bank with the V350-PRO in
mode 200. Mode 200 is a constant current test
mode.
1. Press and hold in the Mode Select button.
2. Turn on the V350-PRO.
3. Rotate the output knob, while still holding the
mode select button in, until the displays read
“mode 200”. NOTE: Machines with an
Advanced Process Panels do not have a mode
select button. Use the same procedure except
hold in the Memory button on the advanced
process panel instead of the mode select button.
4. Release the Mode Select/Memory button and
the machine will be in mode 200.
5. With the machine in mode 200 apply a resistive
load to the welding output terminals (approximately .087 ohms) set the machine output to
300 amps and enable the Weld Terminals.
(Weld Terminals Select ON).
6. Using the test meters note the output voltage
and current.
7. The V350-PRO voltmeter must match the test
meter reading to within +/- 1 volt.
8. The V350-PRO ammeter must match the test
meter within +/- 5 amps.
9. If the voltmeter does not meet the specification
then proceed to the Voltage Calibration
Procedure.
10. If the ammeter does not meet the specification
then proceed to the Current Calibration
Procedure.
NOTE: Before attempting to calibrate the voltage
or current setting of the V350-PRO, be sure to read
the entire voltage or current calibration section. If
the steps are not completed quickly, the machine
will automatically leave the calibration mode without changing the calibration settings. The voltage
and current calibration settings of the V350-PRO
are completely independent of each other.
Adjusting one will not affect the other.
VOLTAGE CALIBRATION
1. Connect the resistive load band (approximately .087 ohms) and test voltmeter to the welding
output terminals.
2. Press and hold in the Mode Select/Memory
button.
3. Turn on the V350-PRO.
4. Rotate the Output Control knob until the display reads “vol cAL”.
5. Release the Mode Select/Memory button.
6. Adjust the output control knob until the actual
output voltage reading on the test volt meter is
20volts +/- .5 volts.
7. Wait for the machine’s output to be automatically turned off and then back on.
8. Adjust the Output Control knob again if necessary to make the actual voltage output 20 volts
+/- .5 volts.
9. Wait for the machine’s output to be automatically turned off and then back on.
10. Repeat the above two steps if necessary.
11. Press and release the Mode Select/Memory
button to save the calibration.
NOTE: If the Mode Select/Memory button is
not pressed within 30 seconds after adjusting
the Output Control knob the machine will leave
the calibration mode and use the previous calibration settings.
CURRENT CALIBRATION
PROCEDURE
1. Connect the resistive load band (approximately .087 ohms) and test ammeter to the
welding output terminals.
2. Press and hold in the Mode Select/Memory
button.
3. Turn on the V350-PRO.
4. Rotate the Output Control knob until the
display reads “cur cAL”.
5. Release the Mode Select/Memory button.
6. The left display will change to “IcAL” to
indicate that current calibration is in
progress.
7. The right display will scroll the following
message: Adj oCP SorEAL cur-300A.
8. Adjust the Output Control knob until the
actual output current reading on the test
ammeter is 300amps +/-2A.
9. Wait for the machines output to be
automatically turned off and then back on.
10. Adjust the Output Control knob again if
necessary to make the actual output current reading on the test ammeter 300
amps +/-2A.
11. Wait for the machines output to be automatically turned off and then back on.
12. Repeat the above two steps if necessary.
13. Press and release the Mode
Select/Memory button to save the calibration.
14. The left display will scroll the message IcAL
SAVEd.
15. The machine will reset to normal operation.
NOTE: If the Mode Select/Memory button
is not pressed within 30 seconds after
adjusting the Output Control knob the
machine will leave the calibration mode
and use the previous calibration settings.
TROUBLESHOOTING AND REPAIR
VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued)
F-49 F-49
V350-PRO
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NOTES
F-50 F-50
V350-PRO
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