MX350 Operators Manual
IM697
RED-D-ARC
MX350
For use with machines having Code Numbers:
January, 2001
10799
OPERATOR’S MANUAL
Red-D-Arc Spec-Built Welding Equipment
This RED-D-ARC welder is built to RED-D-ARC Extreme Duty
design specifications by Lincoln Electric.
Safety Depends on You
This welder is designed and built with safety in mind.
However, your overall safety can be increased by proper installation
... and thoughtful operation on your part.
DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT
WITHOUT READING THIS MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED THROUGHOUT.
And, most importantly, think before you act and be careful.
1-800-245-3660
North America’s Largest Fleet of Welding Equipment
i
i
SAFETY
WARNING
CALIFORNIA PROPOSITION 65 WARNINGS
Diesel engine exhaust and some of its constituents
are known to the State of California to cause cancer, birth defects, and other reproductive harm.
The Above For Diesel Engines
The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
The Above For Gasoline Engines
ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.
Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box
351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available
from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.
BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
FOR ENGINE
powered equipment.
1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.
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.
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.
___________________________________________________
1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.
2.d.5. Do not work next to welding power source.
Mar ‘95
MX350
ii
ii
SAFETY
ARC RAYS can burn.
ELECTRIC SHOCK can
kill.
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.
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.
4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
5.e. Also see item 1.b.
Mar ‘95
MX350
iii
iii
SAFETY
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.
CYLINDER may explode
if damaged.
7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and
pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.
7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.
7.c. Cylinders should be located:
• Away from areas where they may be struck or subjected to
physical damage.
• A safe distance from arc welding or cutting operations and
any other source of heat, sparks, or flame.
7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.
7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.
7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.
7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.
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.
Mar ‘95
MX350
iv
SAFETY
zones où l’on pique le laitier.
PRÉCAUTIONS DE SÛRETÉ
6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.
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:
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.
Sûreté Pour Soudage A L’Arc
1. Protegez-vous contre la secousse électrique:
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.
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.
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.
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.
PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR
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.
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. 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
iv
4. Garder tous les couvercles et dispositifs de sûreté à leur
place.
Mar. ‘93
MX350
v
v
Thank You
for selecting a QUALITY product . We want you to take pride in
operating this product ••• as much pride as we have in bringing
this product to you!
Please Examine Carton and Equipment For Damage Immediately
When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.
Please record your equipment identification information below for future reference. This information can be
found on your machine nameplate.
Model Name & Number _____________________________________
Code & Serial Number _____________________________________
Date of Purchase
_____________________________________
Whenever you request replacement parts for or information on this equipment always supply the information
you have recorded above.
Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:
WARNING
This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.
CAUTION
This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.
vi
TABLE OF CONTENTS
Page
Installation.......................................................................................................................Section A
Technical Specifications .......................................................................................................A-1
Product Description. .............................................................................................................A-2
Recommended Equipment and Processes ..........................................................................A-3
Multi-System Power Source ..........................................................................................A-3
Distribution Box .............................................................................................................A-3
“Pig-Tail” Leads and Connectors ..................................................................................A-3
Remote Output Control Options ....................................................................................A-4
CV Mode Wire WElding ................................................................................................A-4
CC Mode Stick Welding and Gouging...........................................................................A-4
Quick-Connect “Pig-Tails” ....................................................................................................A-4
Attachment and Arrangement of “Pig-Tails” .........................................................................A-5
Work Connection ..................................................................................................................A-5
Case Grounding ...................................................................................................................A-5
Inter-Connection of Converters ............................................................................................A-6
Power Source Setup ............................................................................................................A-7
Operation.........................................................................................................................Section B
Front Panel Controls ............................................................................................................B-1
Recessed Panel Controls .....................................................................................................B-2
Paralleled Converters ...........................................................................................................B-3
Remote Control of Paralleled Converters.............................................................................B-3
Transporting and Storage of the Multi-Weld 350..................................................................B-3
Cable Handling..............................................................................................................B-3
Transporting ..................................................................................................................B-3
Storage..........................................................................................................................B-3
Protection Features .............................................................................................................B-3
Fan as Needed (F.A.N.) ................................................................................................B-3
Over-Voltage Protection ................................................................................................B-3
Over-Current Protection ................................................................................................B-4
Over-Temperature Shutdown........................................................................................B-4
Maintenance ....................................................................................................Section C
Safety Precautions ................................................................................................C-1
Maintenance ..........................................................................................................C-1
Digital Meter Calibration ......................................................................................................C-1
Service .................................................................................................................................C-2
Troubleshooting .............................................................................................................Section D
How to use Troubleshooting Guide......................................................................................D-1
Troubleshooting Guide...........................................................................................D-2 thru D-4
Wiring Diagram and Dimension Prints..........................................................Section E
Parts Lists ....................................................................................................P387 Series
A-1
A-1
INSTALLATION
TECHNICAL SPECIFICATIONS - MX350 (K1823-1)
ELECTRICAL SPECIFICATIONS
AMPS
(DC+)
VOLTS
(DC+)
Output Rating @ 50ºC (122ºF)
350
34
Input Rating @ 50ºC (122ºF)
165
80
Max. Input Range
50-113 (Peak)
Max. O.C.V.
78
Output Preset Range
30-350
15-40
PHYSICAL DIMENSIONS
HEIGHT
11.6 in
295 mm
WIDTH
10.0 in
254 mm
DEPTH
21.5 in
546 mm
NET WEIGHT
59.5 lbs.
27.0 kg.
TEMPERATURE RANGES
OPERATING TEMPERATURE RANGE
-40 to +122ºF
-20 to + 50ºC
STORAGE TEMPERATURE RANGE
-40 to +185ºF
-40 to +85ºC
MX350
A-2
A-2
INSTALLATION
PRODUCT DESCRIPTION
input supply, and provides independent full range control of up to 350A continuous with each converter arc
for + polarity stick and wire processes, as well as for
arc-air gouging.(See Figure 1).
The MX350 converter (K1823-1) is part of a MultiWeld system, ideally suited for construction site welding, which uses a single DC power source, as the only
MULTI-WELD SYSTEM
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PARALLEL
CONVERTERS
Figure 1
The MX350 is a DC to DC converter which converts
higher voltage/lower current input power to lower voltage/higher current output power with over 90% efficiency.
For example; a single 600A continuous rated 70-80v
power source could supply up to five MX350 converters each wire welding at 300 amps, or about ten converters for stick welding at 150 amps, with 26-29v at
the arcs.
The Arc Converter is a single "world" model built to
IEC and CSA standards and meeting the specific
needs inherent to construction site welding:
mize CC performance, and can be paralleled for
higher capacity welding and arc gouging.
• Constant Voltage (CV) mode for positive polarity
cored and solid wire welding with arc-powered
feeders (such as the LN-25).
Portable
• Arcs can be moved quickly with the light weight
Converter that’s easy to carry, or pull, and is small
enough to fit through a 15" (38cm) diameter or 12"
x 16" (31x 41cm) elliptical man-hole.
• Converter is powered by the welding cable from
the DC power source, without the safety hazard of
high AC input supply voltages.
Versatile
• Constant Current (CC) mode for stick and gouging.
Includes Hot Start and Arc Force controls to optiMX350
A-3
A-3
INSTALLATION
• Converter welding controls are near the arc without
long control cables, and a receptacle is provided
for an optional remote for even closer user output
control.
RECOMMENDED EQUIPMENT AND
PROCESSES
MULTI-SYSTEM POWER SOURCE
Simple
• Easy installation with 10 ft. (3m) work clip lead and
user preference quick-connect "pigtails" for input
and electrode weld cables.
• Easy setup with only a few intuitive welding controls and lit displays; including a single
Power/Mode switch with Input level light, and a
single presettable Output Control with separate
digital meters for Amps and Volts, featuring postweld five second memory display.
The Multi-Source 40KW 80VDC buss power source
(K1752-1) is recommended for use in the Multi-Weld
system. However, other DC power sources capable of
supplying the required system buss current, at above
60 volts, may be used. It is recommended that this
power source have lower output inductance (choke)
such as the Lincoln Electric DC-1000, DC-655 or DC600 set for max. output in CC mode. The power
source output VA capacity should be 10% greater
than the sum of the max. VA of the converter arcs
which may all be simultaneously welding or gouging:
Power Source (Volts x Amps) capacity > 1.1 x Sum
of Converters’ (Volts x Amps) arcs
• Easy Service with quick to replace cable "pigtails"and "plug-in" assembly modules, including
accessible PC boards and interchangeable "plugn-play" panel instruments.
DISTRIBUTION BOX
Robust
• Capacity is rated for continuous operation at 350
amps in 50°C (122°F) ambient temperature, and
can be paralleled to multiply CC mode output rating.
• Overload protection is provided with electronic limiting of output current, and with thermostat and
over-voltage shutdown protection which automatically reset.
• Outdoor operation protected with sealed control
and power electronics compartments, with sealed
interconnections, housing "potted" circuit boards,
and using "Central-Air" cooling with "Fan-AsNeeded" for less dirt intake.
• Handling (and mishandling protection) is enhanced
with light, but durably designed, aluminum construction with front to back, top and bottom, handles (also serving as "roll bar" and skid), and a
sheetmetal shell attached with 1/4" steel threaded
fasteners. The strength can easily support a 250
lb. man jumping on the case.
The Multi-Weld Distribution Box (K1736-1) is available for interconnection of the Multi-System using the
same "pig-tail" connection method provided with the
MX350 converter. Six cable strain-relief ports are provided for connection of up to (12) cables for distribution or "daisy-chain" inter-connection to other boxes.
Four "pig-tail" leads (see below) are included with the
Box.
"PIG-TAIL" LEADS AND CONNECTORS
Accessory "pig-tail" leads and Twist-Mate connectors
are available from Lincoln for extra connections to the
MX350 or the Distribution Box:
Order No.
CL012705
Description:
22in.(56cm) long 2/0 (70mm2) cable
with 0.5in.(13mm) hole lug and cut-off
ends.
K852-70
Twist-Mate male insulated plug for
1/0-2/0 (50-70mm2) cable.
K852-95
Twist-Mate male insulated plug for
2/0-3/0 (70-95mm2) cable.
K1759-70
Twist-Mate female insulated receptacle for 1/0-2/0 (50-70mm2) cable.
K1759-95
Twist-Mate female insulated receptacle for 2/0-3/0 (70-95mm2) cable.
MX350
A-4
A-4
INSTALLATION
REMOTE OUTPUT CONTROL OPTIONS
Arc Air Carbon (AAC)
The MX350 is provided with a 3-pin remote receptacle.
Gouging:
Carbons (5/32-3/8)
CV MODE WIRE WELDING
The Converter in CV mode was designed for use with
an arc-powered wire feeder like the LN-25. The
Converter output is always "hot" when the mode
switch is not OFF, so it is recommended that the LN25 model be equipped with the internal contactor in
order to have a "cold" electrode when the gun trigger
is released.
The CV mode recommended processes are positive
(+) polarity wire welding within the output capacity of
the Converter, including:
NS3M (5/64-3/32)
NR305 (.068)
Outershield:
OS-70 (1/16-5/64)
OS-71 (.045-1/16)
QUICK-CONNECT "PIG-TAILS"
The MX350 is factory provided with two 21 in.(53 cm)
long 2/0 AWG (70mm2 ) "pig-tail" cables with their
0.5"(13mm) hole lug ends routed through the "INPUT
+ "(on back) and "ELECTRODE + "(on front) cable
channels of the Converter and attached to the bottomaccessed covered cable connection studs.
Attach the preferred standard user-provided Quickconnect terminal (such as Lincoln Twist-Mate or
Tweco 2-MPC type) to the cut-off end of these cables.
Use the female connector on the "ELECTRODE +"
cable and the male connector on the "INPUT +" cable.
Flux Cored Arc Welding (FCAW)
Innershield:
INSTALLATION
MC-710 (.045-5/64)
Gas Metal Arc Welding (GMAW)
Carbon Steel:
L50/56 (.030-1/16)
CC MODE STICK
GOUGING
WELDING AND
The CC mode recommended processes are positive
(+) polarity stick and arc gouging within the output
capacity of single, or paralleled, Converters; including:
Shielded Metal Arc Welding (SMAW)
E6010/6011:
FW5P/180 (3/32-1/4)
"fast-freeze"
E6013: FW37 (3/32-3/16)
"fill-freeze"
E7010/8010:
SA85/70+ (3/32-7/32)
"fast-freeze" HT pipe
E7018/7028:
JW LH70/3800 (3/325/32) "low-hydrogen"
E7024/6027:
JW1,3/2 (1/8-5/16)
"fast-fill"
MX350
A-5
A-5
INSTALLATION
ATTACHMENT AND ARRANGEMENT OF
"PIG-TAILS"
To best suit the desired inter-connection of the
Converters the "pig-tail" cables may be routed into the
front cable channels, and/or into the back for single or
double "pig-tail" cables to the bottom-accessed covered cable connection studs. (See below and refer to
Figures 1 and 2.):
TO POWER
TO
SOURCE
WORK
TO ELECT.
3. Slip the "pig-tail" cable lug(s) over the stud and
re-secure the flange nut, making sure that lug(s)
nowhere touch any sheetmetal of the stud housing, then fold back the cover insulation and
replace the stud cover.
WARNING
Be sure to follow the safety practice to use
the female connector on the cable which
would normally be electrically "hot" (supply
lead) if disconnected when the system is
energized, and the male on the normally
"cold" (load lead) side. If practical, shut off
power before connecting or disconnecting terminals.
------------------------------------------------------------------------
WORK CONNECTION
IN
ELECT.
+
Each Converter in the Multi-Weld System must have its
individual “Work” lead connected (clipped) to work. The
#3 AWG (27mm2) Work clip lead must have clean metal
connection to the work to complete the DC input supply
and output power circuits of the MX350.
+
INPUT
ELECTRODE
+
+
WARNING
Do not disconnect the Work clip lead without first
switching OFF the Converter panel switch. Failure to
do so will allow the work lead clip to be electrically
"hot" to work, and "hot" to the electrode, through the
circuit of the Converter for about 5 seconds until the
input contactor opens.
------------------------------------------------------------------------
BOTTOM VIEW
ELECT.
IN
CASE GROUNDING
+
+
TO POWER
TO ELECT.
SOURCE
To connect the "pig-tail" cables to the Converter:
1. Stand the Converter vertically on its rear handle
and skid to gain access to the bottom stud covers, then remove the two 0.25"(6.3mm) screws
securing each cover and fold out the cover insulation.
2. Route the appropriate "pig-tail" cable lug ends
under the skid rail (for strain-relief) through the
desired front and/or rear corner channels to the
exposed 0.5"(13mm) stud, and remove the flange
nut with a .75"(19mm) wrench. Note: Input supply
cable(s) must connect through "INPUT +" labeled
channels, and output weld cable(s) must connect
through "ELECTRODE +" labeled channels.
As shipped, the case of the MX350 is isolated from all
of the DC input and output welding terminals, and is
equipped with a grounding terminal screw (.31” /
7.9mm) marked with the symbol
located on the
bottom rear of the Base assembly. ( Refer to the bottom view figure.) In order to comply with CSA and UL
case grounding specifications, this terminal is provided for connection to weldment work which must be
properly grounded per methods meeting local and
national electrical codes. Refer to “Saftey in Welding,
Cutting and Allied Processes”, ANSI Z49.1 (US) and
W117.2 (Canada).
Since any case fault would only involve the DC welding circuit, the size of the grounding lead should have
the capacity to ground the potential fault current without burning open. Use at least #6AWG (13mm2), but
need not exceed the size of the input cable suppling
thew MX350.
Connect the Multi-Weld grounding lead to the work
piece separately from the Work clip. If the same clip is
used for both ground and work connection, the MultiWeld case will be electrically “hot” to the work if the
clip is removed without first switching OFF the panel
switch. ( Refer to the Work clip WARNING above).
MX350
A-6
A-6
INSTALLATION
INTER-CONNECTION OF CONVERTERS
Power Source (Volts x Amp) capacity > 1.1 x Sum of
Converters’ (Volts x Amps) arcs
The input and electrode cables of the MX350
Converters may be inter-connected in a Multi-Weld
System using any combination of Distribution Box(es)
(see Figure 1), paralleling ( CC mode only) and
"daisy-chaining" (see Figure 2) which best fits the field
application setup within the capacity of the power
source supplying the system:
FIXED PARALLEL OPERATION
ELECT.
ELECT.
ELECT.
+
+
+
TO ELECT.
TO
TO WORK
WORK
TO POWER
SOURCE
IN
IN
IN
IN
+
+
+
+
DAISY CHAIN OPERATION
ELECT.
ELECT.
+
+
TO ELECT.
TO ELECT.
TO WORK
TO WORK
TO POWER
SOURCE
IN
IN
IN
+
+
+
SEPARABLE PARALLEL OPERATION
ELECT.
+
TO ELECT.
TO WORK
TO POWER
PARALLEL
JUMPER
SOURCE
IN
+
WARNING
Paralled units may be powered from more than
one source. Disconnect all inputs, including outputs from other sources before working on the
equipment. Before removing the parallel jumper
be sure both Converters are switched OFF. If not,
the male side of the first disconnection will be
electrically "hot" to work.
------------------------------------------------------------------
ELECT.
+
ELECT.
+
TO ELECT.
TO WORK
TO POWER
SOURCE
IN
+
Figure 2
MX350
A-7
INSTALLATION
For Converters (operating at rated output) less than
200ft. (61m) from the power source, the following minimum cable sizes are recommended for the indicated
quantity of Converters supplied by the input cable run
to keep cable temperature and voltage drop within
acceptable limits:
Converters
on Cable
Cable Size
AWG (mm2 )
1
2
3
4
5
1/0 (50)
2/0 (70)
3/0 (95)
4/0 (120)
2x3/0 (2x95)
A-7
POWER SOURCE SETUP
Refer to the Instruction Manual provided with the
Multi-Source power source, or other DC power source
being used, for input power supply connections, output connections and controls setup.
In general:
1. Connect the positive (+) output connection terminal to the input supplying the Multi-Weld system,
and the negative (-) output connection terminal to
the work. (see Figure 1).
2. If not using a Multi-Source power source;
The output "Electrode" cable should be 2/0 AWG
(70mm2 ) if sized for rated output up to 200 ft.(61m)
from the Converter. If paralleled, the output cable to
the arc should be 4/0(120mm2).
WARNING
Do not disconnect the Work clip lead without first
switching OFF the Converter panel switch. Failure to
do so will allow the work lead clip to be electrically
"hot" to work, and "hot" to the electrode, through the
circuit of the Converter for about 5 seconds until the
input contactor opens.
------------------------------------------------------------------------
MX350
a. If an inductance control, or tap, is selectable,
use lowest inductance.
b. Use CC (Constant Current) mode, for maximum
supply voltage.
c. Set panel output control to maximum, for maximum current capacity.
d. Activate output with the "output terminals on"
switch, or jumper (2-4 on LE Co terminal strips).
B-1
B-1
OPERATION
1
3
4
5
6
2
8
9
10
7
WORK
+
INPUT
ELECTRODE
+
+
Figure 3
The numbered items of Figure 3, above, match the numbered items described below:
FRONT PANEL CONTROLS
•Only VOLTS digital meter is lit displaying the
preset voltage setting
These few instruments are basic to the operation and
monitoring of the Converter. They are intuitively laid
out so that the panel’s left side is weld current related,
and the right side is weld voltage related:
(1) Input Power/ Mode Switch has three positions:
•Output will be on at the output voltage setting.
(2) Output Control has 3-3/4 turn resolution with
slip-clutch to prevent control pot damage.
In CC mode it presets AMPS (30-350A range)
when not welding, and adjusts actual arc current
while welding
.
Center is OFF which shuts off input power to the
Converter.
•Neither displays nor output is on if in OFF
position.
Left is on for CC (constant current) welding
mode.
•Only AMPS digital meter is lit displaying the
preset current setting.
In CV mode it presets VOLTS (15-40v range)
when not welding, and adjusts actual arc voltage
while welding.
(3) AMPS Digital Meter is a 3-1/2 digit LED meter
which displays:
•Output will be on at o.c.v. (open circuit voltage).
Right is on for CV (constant voltage) welding
mode.
MX350
Preset Amps in CC mode when not welding.
"Blank" in CV mode when not welding.
Actual Amps while welding in both CC and CV
modes.
B-2
OPERATION
Average Amps for about 7 seconds after welding
stops in CC and CV modes only.
•The 5 second memory display is indicated by
the display’s left-most decimal point blinking,
and is interrupted if arc is restarted.
Accuracy of Actual Amps is within 3%, and typically within 10 amps of Preset.
•An Actual Amps meter calibration adjustment
trimmer is provided. ( See MAINTENANCE
section).
Two front screws secure the meter bezel which
holds a replaceable spatter shield lens (Lincoln
part no. T14807-9).
(4) VOLTS Digital Meter is a 3-1/2 digit LED meter
which displays:
Preset Volts in CV mode when not welding.
"Blank" in CC mode when not welding.
Actual Volts while welding in both CV and CC
modes.
Average Volts for about 7 seconds after welding
stops in CV and CC modes only.
•The 7 second memory display is indicated by
the display’s left-most decimal point blinking,
and is interrupted if arc is restarted.
Accuracy of Actual Volts is within 3%, and typically within 1 volt of Preset.
•An Actual Amps meter calibration adjustment
trimmer is provided. ( See MAINTENANCE
section).
RECESSED PANEL CONTROLS
These instruments are recessed behind a screw
secured hinged cover panel, and are not typically
required for normal operator access. They may be left
covered, as factory set, or setup as desired with or
without the hinged cover secured:
(7) Hot Start Control is provided to enhance arc starting
in both CC and CV modes with an extra output
"boost" at the arc strike that returns to the setting
level in less than a second (about 0.30 sec. in CC
mode, and 0.045 sec. in CV mode). This extra Hot
Start amplitude is adjustable from "0" (no extra) to
"10" (100% of setting extra), with the factory set "5"
(center) position typically good for most weld starting.
However, “0” may provide smoother starting for fine
wire CV MIG.
(8) Arc Force Control is only functional in the CC
mode with Stick/Gouge slope. (See below). Arc
Force prevents "stubbing" of the electrode by providing extra weld current
if the arc voltage
drops below about 14v. This extra weld current is
adjustable from "-10" (no extra) to "+10" (60% of
setting extra), with the factory set "0" (center) position typically good for most welding.
(9) CC Slope Switch is provided to enhance stick
welding on "fast-freeze" type electrodes (such as
E6010 and E7010) typically used on pipe welding
applications for fast root pass vertical down "drag"
technique (not "whipping"). If using this type of
application improved operating appeal may be
obtained if the CC Slope is switched from the factory set STICK / GOUGE position to the PIPE
position.
Note: The PIPE position uses a "drooping" type
slope (~22v/100A), so preset current (not actual
current) accuracy may be affected if arc length
voltage is not maintained at the typical 28v used
for these electrodes. Typically this error should not
be more than about 10 A.
Two front screws secure the meter bezel which
holds a replaceable spatter shield lens.
(5) Thermal Shutdown (yellow) Light turns on if
output is shutdown because internal overheating
has occurred. (See OVER TEMPERATURE
SHUTDOWN in this section).
(6) Input Voltage (green) Light indicates appropriate
level of input supply voltage:
B-2
(10) Remote Control Receptacle is provided to permit the use of an optional Remote output control
to provide operator control even closer to the arc.
"On" for adequate input voltage over 50v for CC
or CV mode.
"Off" for inadequate input voltage under 50v, no
input or Power Switch OFF.
Note: If green light is "blinking" the input voltage may
be drifting above and below the 50 V level due to
loads on supply and cables. This may also cause the
input contactor to “chatter”.
MX350
Connecting the Remote’s plug to this receptacle
automatically transfers output control from the
panel Output Control (item (2) above) to the
Remote pot control, which will function the same,
but with only single-turn resolution.
Disconnecting the Remote’s plug from this receptacle automatically transfers output control back
to the panel Output Control (item (2) above).
B-3
B-3
OPERATION
TRANSPORTING AND STORAGE
OF THE MX350
PARALLELED CONVERTERS
MX350 converters that are paralleled (see INTERCONNECTION OF CONVERTERS in the INSTALLATION section) must each be set up in the same manner in order to manage the arc current drawn from
each:
1) Set to CC mode with CC SLOPE switch set to
STICK/GOUGE.
2) Preset Output Controls of both paralleled
Converters to ~1/2 desired total Amps.
If arc current from each Converter gets too out of balance (primarily a problem if trying to use CV mode)
the hotter running Converter could go into current-limiting and/or Thermal shutdown (See OVER-TEMPERATURE SHUTDOWN in the INSTALLATION section),
which might then overload the other, or at least interrupt the operator’s process. However, no damage will
occur to the Converters.
CABLE HANDLING
The input and electrode cables are easily disconnected from the quick-connect "pig-tails", and the Work
lead can be reeled around the MX350 case cradled by
the base skid handles, to which the clip can be
secured.
TRANSPORTING
The Converter may be carried by one or two persons
using the front and rear top and bottom handles. It can
also be set vertically on a two wheel cart, or horizontally on a wagon, to convey it longer distances.
STORAGE
The MX350 may be set on a floor, or shelf, horizontally on its skid, or vertically standing on its rear top and
bottom handles.
PROTECTION FEATURES
REMOTE CONTROL OF
PARALLELED CONVERTERS
The MX350 design features electronic protection systems to help assure reliable operation even under
adverse conditions. These systems include:
(FOR CC STICK/GOUGE MODE ONLY)
FAN AS NEEDED (F.A.N.)
Full Range remote control can be accomplished with a
separate optional Remote output control (see
INSTALLATION section) connected to each
Converter. The current contribution of each Converter
will depend on its remote output setting.
Partial Range remote control can be accomplished
with a single Remote Control connected to the output
Converter with the input Converter preset with its
panel Output Control to below the minimum desired
output range. The Remote Control, connected to the
output Converter, will control its output to add to the
preset level.
The cooling fan will turn on when the arc starts and
remain on for about a minute after the arc is out to
cool down the power components.
This feature electronically controls the fan so it does
not run continuously when the power switch is turned
on. This will minimize the amount of contaminate and
clogging debris which may be drawn into the
Converter, in addition to the "Central-Air" system
design which intakes lower velocity air through the
higher side louvers and blows out through the lower
back louvers with higher velocity.
OVER-VOLTAGE PROTECTION
The MX350 input contactor will open if the input supply voltage is above 113VDC, and will automatically
reclose if the voltage drops back below. During OverVoltage Shutdown the panel displays will be as appropriate for the non-welding mode. (See FRONT PANEL
CONTROLS in this section).
CAUTION
When the contactor recloses the output of the
Converter will reactivate. Switching OFF input power
prevents unexpected reactivation.
-----------------------------------------------------------------------This feature protects internal components of the
Converter from excessive voltage levels.
MX350
B-4
OPERATION
OVER-CURRENT PROTECTION
The max. output current of the MX350 is electronically
limited, to protect internal power components, so as
not to exceed about 375 amps average and 500 amps
peak. When the current load starts to exceed these
limits the output is reduced (lower voltage) to sustain
these max. levels, until the current is reduced. even to
a shorted output.
Prolonged output at this max. current limit level may
eventually overheat the Converter’s internal power
components causing over-temperature shutdown.
(See following section).
Short circuit protection is also provided to reduce max.
output current to about 200 amps if the output voltage
is reduced, by loading or current limiting (see above),
to below 14 volts for over 7 seconds (indicating a
shorted output). The output current must be interrupted to reset this reduced protective level.
This max. 200 amp short circuit level will allow using
the MX350 for "pipe-thawing" applications without
causing over-temperature shutdown. (See following
section).
OVER-TEMPERATURE SHUTDOWN
A second over-load protection switch in the Imbalance
Protector Module was added to MX350 models with
codes 10736, and higher. This module senses for an
imbalance of current between the paralleled Chopper
boards by sensing the differential choke voltage. If this
voltage exceeds 1v for a sustained time the
Imbalance Protector will also activate over-temperature shut down to protect the higher current Chopper
board from over heating.
CAUTION
When the thermostat resets the output of the
Converter will reactivate. Switching OFF input power
prevents reactivation, but also shuts off the cooling
fan which prolongs the reset time.
-----------------------------------------------------------------------During Over-Temperature Shutdown the panel displays will be as appropriate for the non-welding mode.
(See FRONT PANEL CONTROLS in this section),
except the fan will remain running and the Thermal
Shutdown (yellow) Light will be lit until reset. Typically,
If shutdown occurs repeatedly below 300 amps output
with fan running, imbalance of the Chopper board current may likely be the cause.
MX350
B-4
C-1
MAINTENANCE
SAFETY PRECAUTIONS
WARNING
Have qualified personnel do the maintenance
work.
Always use the greatest care when working near
moving parts.
If a problem cannot be corrected by following the
instructions, take the machine to the nearest
Lincoln Field Service Shop.
----------------------------------------------------------------------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.
------------------------------------------------------------------------
See additional warning information
throughout this operator’s manual and
the Engine manual as well.
-----------------------------------------------------------
MAINTENANCE
The only maintenance which may be required for the
MX350 is to clean out any accumulated dirt and debris
which could contaminate internal components, or
obstruct proper cooling of the power components
resulting in premature over-temperature shutdown.
The recommended cleaning procedure is as follows:
1. Be sure to disconnect the Converter’s input
cable to remove its input power.
2. Remove the four screws securing the rear louver
panel, and remove the panel to expose the cooling tunnel heatsinks. (See Figure 4 below):
Figure 4
MX350
C-1
3. Holding the unit by the front handles, so the back is
facing down, shake the loose debris out of the unit.
Raking out the heatsink fins may be necessary for
jammed debris.
4. If necessary, remove the case wraparound cover
and using the skid handles to hold upside down
carefully dump out any remaining loose debris,
or carefully blow out using low pressure air.
5. Reassemble the cleaned out Converter by
reversing the above steps.
DIGITAL METER CALIBRATION
If calibration of either digital meter is ever necessary,
meter calibration adjustment trimmers are provided on
the Weld Control PC board inside the Control Module
(see Figure 5). Calibration must be done with an
Output current load, so meters are displaying Actual
(not Preset) values. It is recommended that the calibration levels be near the rating plate values, for best
accuracy, and compared to "master" meters with better than 2% accuracy.
The accuracy of Actual AMPS meter should be within
3% of the welding amps monitored. The AMPS meter
trimmer (R561) is located near the center of the Weld
Control PC board just below the VOLTS meter trimmer (R562). Clockwise rotation of the trimmer adjustment screw will decrease the meter reading.
The accuracy of Actual VOLTS meter should be within
3% of the welding volts monitored. The VOLTS meter
trimmer (R562) is located near the center of the Weld
Control PC board just above the AMPS meter trimmer (R561). Clockwise rotation of the trimmer adjustment screw will decrease the meter reading. The
"master" voltmeter should be connected as close as
possible to the "ELECTRODE +" stud and "WORK-"
lead bolt, for best accuracy.
C-2
MAINTENANCE
SERVICE
The MX350 was designed for easy service using
quick to replace components, and assembly modules
C-2
which could be simply swapped out at the job site to
minimize down time, and so more prolonged troubleshooting and repair of the module may be done
later on the service bench.
4
2
1
3
Figure 5
The above, Figure 5, shows the three assembly modules of the Converter which are covered with the Case
Wraparound (item (4)):
Control Module (item (1) is removed from the Base
This module assembly includes:
Module assembly by removing the two bottom
•Heatsinked power switching (IGBT) boards and isoaccessed screws and disconnecting the three sealed
lated diodes.
harness plugs from the receptacles on the back of the
•Capacitors and potted power supply boards.
Control box.
•Fan and sheetmetal bulkhead tunnel and component enclosure.
This module is a sealed enclosure containing replace•Harness lead receptacles and power leads that conable electronic components:
nect to Base Module.
•Sealed back cover which mounts the internal "potted" Control and Peripheral PCB’s.
Base Module (item (3) is the mounting and connec•Front panel with "plug-n-play" instruments which
tion platform for the other modules.
individually plug to the Control PCB.
•Interchangeable "potted" digital meters with front
This module assembly includes:
replaceable spatter shield lenses.
•Base sheetmetal with input / output connection
•Harness lead receptacles that connect to Base
chambers with "pigtail" leads.
Module harness lead plugs.
•Input contactor, input diodes heat sink assembly
and work clip lead.
Tunnel Module (item (2) is removed from the Base
•Output chokes and current shunt.
Module assembly by removing the four bottom
•Lead harness sealed plugs connect to Tunnel and
accessed screws and disconnecting the two sealed
Control Module receptacles.
harness plugs and power leads.
Note: Removal of Control Module improves access to
disconnect Tunnel Module power leads.
MX350
D-1
TROUBLESHOOTING
D-1
HOW TO USE TROUBLESHOOTING GUIDE
WARNING
Service and Repair should only be performed by 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.
__________________________________________________________________________
This Troubleshooting Guide is provided to
help you locate and repair possible machine
malfunctions. Simply follow the three-step
procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM).
Look under the column labeled “PROBLEM
(SYMPTOMS)”. This column describes possible symptoms that the machine may
exhibit. Find the listing that best describes
the symptom that the machine is exhibiting.
Step 3. RECOMMENDED COURSE OF
ACTION
This column provides a course of action for
the Possible Cause, generally it states to
contact your local Authorized Field Service
Facility.
Step 2. POSSIBLE CAUSE.
The second column labeled “POSSIBLE
CAUSE” lists the obvious external possibilities that may contribute to the machine
symptom.
If you do not understand or are unable to
perform the Recommended Course of
Action safely, contact your local Authorized
Field Service Facility.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MX350
D-2
D-2
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Machine completely dead:
Input contactor does not pull in,
meters are off.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
1. Check cable connections from (+)
Input and Work to power source
for loose or faulty connection.
2. Input voltage may be too low.
Measure input voltage to
machine, should be 50 – 113
VDC.
3. The power switch may be faulty.
4. The DC Buss Power Supply PCB
or its connections may be faulty.
5. The Analog Control Power Supply
PCB may be faulty.
6. The Weld Control PCB may be
faulty.
Meter turns on but input contator 1. Check input voltage, should be
less than 113 VDC.
does not pull in.
Machine has no output:
2. Remote receptacle output switching enabled. Check if jumper is
open on plug P21. (Refer to wiring
diagram).
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Authorized Field
Service Facility.
3. The contactor or supply voltage to
contactor coil may be faulty.
4. The connections at PCB connectors inside the control box may be
faulty.
5. The Peripheral PCB may be
faulty.
6. The Weld Control PCB may be
faulty.
Thermal light comes on.
No output:
1. Thermal shut down. Wait until
machine cools down and thermal
light goes out. Do not overload
machine.
2. The thermostat or imbalance protector (if present) or their connections may be faulty.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MX350
D-3
D-3
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Meter turns on, input contactor
pulls in, thermal light is off.
Machine has no output:
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
1. The output cable connections may
be faulty. Check (+) Electrode
and Work cable connections.
2. The connections at control box
plugs, chopper boards plugs, or
Analog Control Power Supply PCB
connectors may be faulty.
3. Inputs to Chopper PCB or
Chopper PCB may be faulty.
4. The Analog Control Supply PCB
may be faulty.
5. The connection at PCB connectors inside the control box may be
faulty.
6. The Weld Control PCB may be
faulty.
Preset is not adjustable:
Note: Panel control is disabled if
Remote is plugged in.
Preset range is not right:
1. The output control potentiometer
or its connections may be faulty.
If all recommended possible areas
of misadjustment have been
2. The Weld Control board or its con- checked and the problem persists,
nections may be faulty.
Contact your local Authorized
Field Service Facility.
1. A faulty or missing plug P3 at connector J3 of Weld Control PCB.
2. The Weld Control board or its connections may be faulty.
None of the meters comes on in
CC or CV settings:
1. The Analog Control Power Supply
PCB or its connections may be
faulty.
2. The Weld Control PCB or connections to meters may be faulty.
3. Faulty meters.
Meter comes on in only one of the 1. The Weld Control PCB or connections to meters may be faulty.
CC or CV settings:
2. Faulty meters.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MX350
D-4
D-4
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The meter is not accurate:
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
1. The Analog Control Power Supply
PCB or its connections may be
faulty.
2. The Weld Control PCB may be
faulty.
Fan does not run when turning
machine on:
1. Fan does not normally run until
machine is welding. See
Instruction Manual.
Fan does not run when welding:
1. Faulty Supply voltage to fan, normal is 40 VDC.
2. Replace fan if supply voltage to
fan is good.
3. The Weld Control PCB may be
faulty.
No control, very high output current:
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Authorized Field
Service Facility.
1. Check input & output cables.
Check connections at (+) Input
stud & (+) Electrode stud, make
sure they don’t short to case.
2. Faulty shunt lead connection.
3. Faulty output control potentiometer or its connections.
4. Faulty Weld Control PCB.
No control, maximum output current stays around 200A:
1. Check output cables. Check connections at (+) Electrode stud and
Work.
2. Faulty voltage feedback connection. Check continuity from lead
#401 at C1 to lead #301 at pin 1
of P22 (refer to wiring diagram).
3. Faulty Weld Control PCB.
No control :
1. Faulty output control potentiometer or its connections.
2. Faulty connections at Weld
Control PCB connectors.
3. Faulty Weld Control PCB.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MX350
D-5
D-5
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Current changing with arc length
in Stick welding:
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
1. Check the CC Slope switch on the
recessed panel, it should be set at
Stick/Gauge position for Stick
welding.
2. Faulty CC Slope switch or connections.
3. Faulty Weld Control PCB.
Poor performance on "fast-freeze" 1. Check the CC Slope switch on the
type electrodes such as E6010,
recessed panel, it should be set at
E7010:
Pipe position.
2. Faulty CC Slope switch or connections.
3. Faulty connections on Weld
Control PCB connectors.
4. Faulty Weld Control PCB.
Bad starting:
1. Adjust Hot Start setting on the
recessed panel.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Authorized Field
Service Facility.
2. Check Hot Start potentiometer
and connections. The Hot Start
and Arc Force potentiometers are
interchangeable, switch them to
check out.
Electrode "stubbing":
1. Adjust Arc Force setting on the
recessed panel.
2. Check Arc Force potentiometer
and connections. The Hot Start
and Arc Force potentiometers are
interchangeable, switch them to
check out.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MX350
234A
S2
STICK/
GOUGE
PIPE
INPUT
INDICATOR
LIGHT
PL1
234
1 2
3 4
4 PIN
J7, J8, J9
J41, J46
1
2
2 PIN
J6
OFF
ARC FORCE
LO
WIPER
3
1
ARC FORCE
J9
4 6
6 PIN
J10, J11, J45
3
4
8
5
8 PIN
J2, J3
J13, J47
1
5
6
10
10 PIN
J4, J5, J42
1
8
16
1
9
4 PIN
J21
4
2
2
8
5
1
7
4
9 PIN
J20, J22, J23,
J24, J45, J45A
9
6
3
4
3
4 PIN
P21
2
1
8
7
9
6
3
9 PIN
P20,P22, P23,
P24,P45, P45A
5
2
4
1
J2
J12
WELD CONTROL PCB
J11
(VIEWED FROM LEAD SIDE OF RECEPTACLE)
1
J31
PERIPHERAL PCB
HOT START
J8
J4
331
1 2 3 4 5 6 7 8 9
(VIEWED FROM COMPONENT SIDE OF P.C. BOARD)
J1
J3
J6
1 2 3 4
PANEL RECEPTACLE CAVITY NUMBERING SEQUENCE
16 PIN
J12, J31
R2
R3
L3
J21
PANEL RECEPTACLES
PCB CONNECTOR CAVITY NUMBERING SEQUENCE
C
B
B
C
A
A
REMOTE RECEPTACLE
L10
HI
R1
OUTPUT CONTROL
223
THERMAL
LIGHT
PL2
+
222
HOT START
TIN TERMINAL
219
CV
202
231
AMP
CC
202A
217
327
227
PANEL PLUGS
P21
202B
S1
218
VOLT
COVERED PANEL
(VIEWED FROM
REAR)
CC SLOPE
217
224
221
202B
M1
M2
M3
M4
M5
M6
M9
M10
MAX
VAR
M4
M9
M5
M10
ON/OFF & MODE SELECT
MIN
M1
M2
M3
M4
M5
M6
M9
M10
MIN
MAX
VAR
R 226
227
230
R 326
R 226
301
201
VAR
MIN
MAX
M1
M6
M2
302
202
206
223
207
D3
E3
M3
330
304
222
237
J30
R2, R3: 10K, ONE TURN
R1: 10K, MULTI-TURN
M3
J5
L3 THROUGH L10: RF CHOKES
KEY PIN
J32
J22
P22
J13
J7
OUTPUT
CONTROL
J10
J23
P23
+
330
X1
J24
P24
L9
436
437
412
410
439
438
441
440
442
408
409
411
D2
BP5
BP3
CR1
X1A
J45
+
FAN
X4
X4A
BP2
L1
X4A
5
KEY PIN
6 7
C2
+
X1A
J47
J46
8 9
REVERSE
DIODE
D6
L2
BP4
WORK
327
R 326
G3943
10-2000D
CASE
GROUNDING
SCREW
50 mV/400A
SHUNT
CHOPPER PCB
(RIGHT)
(+) ELECTRODE
BP1
OUTPUT CHOKE (RIGHT)
HEATSINK
CONNECTION (RIGHT)
D4
J45A
5 6 8 1 3 7 9 2 4
P45A
J20
PANEL RECEPTACLES
PANEL PLUGS
P20
(VIEWED FROM PCB SIDE)
TUNNEL ASSEMBLY
INPUT CAPACITOR
(RIGHT)
436
442
437
404
403
401A
402
BY-PASS PCB
OUTPUT CHOKE (LEFT)
303
303A
CHOPPER PCB
(LEFT)
303
2 3 4
304
1
P45
L8
300
5 6 8 7 9 1 3 2 4
J41
J42
(+) INPUT
D1
6 7 8 9
301
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
(-) INPUT /
RESISTORS = OHMS/WATT UNLESS OTHERWISE SPECIFIED
ALL SWITCH WIRING VIEWED FROM REAR OF SWITCH
IMBALANCE PROTECTOR
NOTE: SINCE COMPONENTS OR CIRCUITRY OF A PRINTED CIRCUIT BOARD
MAY CHANGE WITHOUT AFFECTING THE INTERCHANGEABILITY OF A
COMPLETE BOARD. THIS DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS
OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE NUMBER.
306
307
THERMOSTAT
303A
CR1
HEATSINK
CONNECTION
(LEFT)
REVERSE
DIODE
D5
INPUT CAPACITOR
(LEFT)
C1
X1
5
R 315
1 2 3 4
INPUT CONTACTOR
X4
N.B. R-XXX DENOTES A RED LEAD NUMBERED XXX
NOTES:
L4
L5
8 9
5 6 7
KEY PIN
1 2 3 4
R 213
(VIEWED FROM PCB SIDE)
200
R 313
314
214
M4
M9
M5
M10
308
300
200
R 315
211
306
307
236
238
C
(VIEWED FROM REAR)
218
214
224
237
230
201
238
234
204
208
VAR
MIN
MAX
L7
R 213
309
209
B
CONTROL BOX
BACK PANEL
R 215
211
CONTROL BOX
FRONT PANEL
HI
WIPER
LO
204
231
206
207
208
219
221
216
M1
316
216
210
M6
M2
310
R 215
311
210
312
212
A
212
209
234A
236
309
409
R 313
R 413
311
411
314
414
310
410
KEY PIN
ANALOG CONTROL
312
412
316
416
POWER SUPPLY PCB
R 415
401
401A
FREE WHEELING
DIODES (LEFT)
L6
DIAGRAMS
INPUT DIODES
331
R 413
414
440
441
B7
B3
B1
B2
302
402
308
408
MX350 WIRING DIAGRAM
DC BUSS POWER SUPPY PCB
401
RED LEAD
438
439
R 415
416
403
404
FREE WHEELING
DIODES (RIGHT)
MX350
B1
B2
B7
B3
E-1
ENHANCED
WIRING DIAGRAM
E-1
DIMENSION PRINT - MX350 CONVERTER
DIAGRAMS
MX350
11321
A
E-2
E-2
DIMENSION PRINT FOR DISTRIBUTION BOX
M19448
C-UF
E-3
DIAGRAMS
MX350
E-3
NOTES
MX350
NOTES
MX350
Now Available...12th Edition
The Procedure Handbook of Arc Welding
New Lessons in Arc Welding
This printing will go fast so don’t delay. Place your
order now using the coupon below.
Lessons, simply written, cover manipulatory techniques;
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exercises, questions and answers are suggested for each
lesson.
The hardbound book contains over 750 pages of welding
information, techniques and procedures. Much of this material
has never been included in any other book.
528 pages, well illustrated, 6” x 9” size, bound in simulated,
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With over 500,000 copies of previous editions published
since 1933, the Procedure Handbook is considered by many to
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For details write:
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● Do not touch electrically live parts or
WARNING
Spanish
AVISO DE
PRECAUCION
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
● Keep flammable materials away.
● Wear eye, ear and body protection.
● Mantenga el material combustible
● Protéjase los ojos, los oídos y el
electrode with skin or wet clothing.
● Insulate yourself from work and
ground.
● No toque las partes o los electrodos
bajo carga con la piel o ropa mojada.
● Aislese del trabajo y de la tierra.
● Ne laissez ni la peau ni des vête-
ments mouillés entrer en contact
avec des pièces sous tension.
● Isolez-vous du travail et de la terre.
● Berühren Sie keine stromführenden
Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!
● Isolieren Sie sich von den
Elektroden und dem Erdboden!
● Não toque partes elétricas e elec-
trodos com a pele ou roupa molhada.
● Isole-se da peça e terra.
fuera del área de trabajo.
● Gardez à l’écart de tout matériel
inflammable.
● Entfernen Sie brennbarres Material!
cuerpo.
● Protégez vos yeux, vos oreilles et
votre corps.
● Tragen Sie Augen-, Ohren- und Kör-
perschutz!
● Mantenha inflamáveis bem guarda-
dos.
● Use proteção para a vista, ouvido e
corpo.
Japanese
Chinese
Korean
Arabic
READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE
USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.
SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS
CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.
LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A
ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.
LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HERSTELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.
● Keep your head out of fumes.
● Use ventilation or exhaust to
● Turn power off before servicing.
● Do not operate with panel open or
guards off.
remove fumes from breathing zone.
● Los humos fuera de la zona de res-
piración.
● Mantenga la cabeza fuera de los
humos. Utilice ventilación o
aspiración para gases.
● Gardez la tête à l’écart des fumées.
● Utilisez un ventilateur ou un aspira-
● Desconectar el cable de ali-
mentación de poder de la máquina
antes de iniciar cualquier servicio.
● Débranchez le courant avant l’entre-
tien.
teur pour ôter les fumées des zones
de travail.
● Vermeiden Sie das Einatmen von
Schweibrauch!
● Sorgen Sie für gute Be- und
Entlüftung des Arbeitsplatzes!
● Mantenha seu rosto da fumaça.
● Use ventilação e exhaustão para
remover fumo da zona respiratória.
● Strom vor Wartungsarbeiten
● No operar con panel abierto o
guardas quitadas.
● N’opérez pas avec les panneaux
ouverts ou avec les dispositifs de
protection enlevés.
● Anlage nie ohne Schutzgehäuse
abschalten! (Netzstrom völlig öffnen; Maschine anhalten!)
oder Innenschutzverkleidung in
Betrieb setzen!
● Não opere com as tampas removidas.
● Desligue a corrente antes de fazer
● Mantenha-se afastado das partes
serviço.
● Não toque as partes elétricas nuas.
● Não opere com os paineis abertos
moventes.
WARNING
Spanish
AVISO DE
PRECAUCION
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
ou guardas removidas.
Japanese
Chinese
Korean
Arabic
LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS
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