Lincoln Electric IM697 User Manual

IM697-B

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RED-D-ARC

MX 300

For use with machines having Code Numbers:

10799
11149
11855

September, 2011

(

OPERATOR’S MANUAL

Red-D-Arc Spec-Built Welding Equipment

This

RED-D-ARC

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.

The Global Leader in Welder Rentals

welder is built to

RED-D-ARC Extreme Duty

i

SAFETY

i

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

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

The Above For Diesel Engines

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

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

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

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

The Above For Gasoline Engines

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

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric 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.

___________________________________________________

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

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

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

ii

SAFETY

ii

ELECTRIC SHOCK can
kill.

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

ARC RAYS can burn.

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

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

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

FUMES AND GASES
can be dangerous.

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

5.c.

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

5.d. 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.

vapors

to

5.e. 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.f. Also see item 1.b.

iii

SAFETY

iii

WELDING and CUTTING
SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

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
been “cleaned”. For information, purchase “Recommended
Safe Practices for the
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.

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

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

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
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.

the welding sparks from starting a fire.

though

they have

Preparation

for Welding and Cutting of

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.

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

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

Refer to http://www.lincolnelectric.com/safety for additional safety information.

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

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

Sûreté Pour Soudage A LʼArc

1. Protegez-vous contre la secousse électrique:

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

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

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

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

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

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

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

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

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

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

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

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

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

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

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

10. Ne pas souder en présence de vapeurs de chlore provenant
dʼopérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de lʼarc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.

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

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

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

a. Utiliser un bon masque avec un verre filtrant approprié

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

b. Porter des vêtements convenables afin de protéger la

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

c. Protéger lʼautre personnel travaillant à proximité au

soudage à lʼaide dʼécrans appropriés et non-inflammables.

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

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

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

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

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

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

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

for selecting one of our QUALITY products. We want you to take

Thank You

CUSTOMER ASSISTANCE POLICY

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

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

Subject to Change – This information is accurate to the best of our knowledge at the time of printing.

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.

vv

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

Product _________________________________________________________________________________

Model Number ___________________________________________________________________________

Code Number or Date Code (if available)______________________________________________________

Serial Number (if available)__________________________________________________________________

Date Purchased___________________________________________________________________________

Where Purchased_________________________________________________________________________

Whenever you request replacement parts 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.

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-4

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 RED-D-ARC MX350 .........................................................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

vi

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 ...................................................................................................P-387 Series

A-1

INSTALLATION

TECHNICAL SPECIFICATIONS - RED-D-ARC MX350 (K1823-1)

ELECTRICAL SPECIFICATIONS

AMPS

(DC+)

VOLTS

(DC+)

A-1

Output Rating @ 50ºC (122ºF)

Input Rating @ 50ºC (122ºF)

Max. Input Range

Max. O.C.V.

Output Preset Range

PHYSICAL DIMENSIONS

HEIGHT

11.6 in

295 mm

WIDTH

10.0 in

254 mm

TEMPERATURE RANGES

OPERATING TEMPERATURE RANGE

-40 to +122°F

-20 to + 50°C

350

165

30-350

DEPTH

21.5 in

546 mm

STORAGE TEMPERATURE RANGE

34

80

50-113 (Peak)

78

15-40

NET WEIGHT

-40 to +185°F

-40 to +85°C

59.5 lbs.

27.0 kg.

RED-D-ARC MX350

A-2

INSTALLATION

A-2

PRODUCT DESCRIPTION

The RED-D-ARC MX350 converter (K1823-1) is part
of a Multi-Weld system, ideally suited for construction
site welding, which uses a single DC power source, as
the only 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 RED-D-ARC 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 RED-D-ARC
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:

Versatile

• Constant Current (CC) mode for stick and gouging.
Includes Hot Start and Arc Force controls to opti­mize 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 thatʼs 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.

MULTI-WELD SYSTEM

®

MULTI-SOURCE

MULTI-SOURCE

LINCOLN

ELECTRI

®

C

LINCOLN

ELECTRIC

®

MULTI-SOURCE

LINCOLN

ELECTRIC

Figure 1

CONVERTER

LI
NC
OL

ELEC

N

TRIC

®

MULTI-WELD 350

DISTRIBUTION
BOX

PARALLEL

CONVERTERS

LINCOLN

ELEC

LINCOLN

350

TRIC

ELECTRIC

®

MULTI-WELD 350

®

MULTI-WELD 350

340

CONVERTER

LINCOLN

ELECTR

®

IC

MULTI-WELD 350

340

350

®

MULTI-WELD 350

LINCOLN

ELECTRIC

LINC
OLN

ELECTRIC

®

MULTI-WELD 350

350

®

MULTI-WELD 350

LINCOLN

ELECTRIC

®

LINCOLN

LN-25

ELECTRIC

WIRE FEEDER

340

350

350

®

MULTI-WELD

LINCOLN

ELECTRIC

340

WIRE

STICK

700 AMP ARC GOUGE

RED-D-ARC MX350

A-3

INSTALLATION

A-3

• 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.

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.

• Easy Service with quick to replace cable "pig­tails"and "plug-in" assembly modules, including
accessible PC boards and interchangeable "plug­n-play" panel instruments.

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.

RECOMMENDED EQUIPMENT AND
PROCESSES

MULTI-SYSTEM POWER SOURCE

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 Convertersʼ (Volts x Amps) arcs

DISTRIBUTION BOX

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
RED-D-ARC 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

• 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.

RED-D-ARC MX350

Accessory "pig-tail" leads and Twist-Mate connectors
are available from Lincoln for extra connections to the
RED-D-ARC MX350 or the Distribution Box:

Order No. Description:

CL012705 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 recepta-

cle for 1/0-2/0 (50-70mm2) cable.

K1759-95 Twist-Mate female insulated recepta-

cle for 2/0-3/0 (70-95mm2) cable.

A-4

INSTALLATION

A-4

REMOTE OUTPUT CONTROL OPTIONS

The RED-D-ARC MX350 is provided with a 3-pin remote
receptacle.

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:

Flux Cored Arc Welding (FCAW)

Innershield: NS3M (5/64”-3/32”)

NR305 (.068”)

Outershield: OS-70 (1/16”-5/64”)

OS-71 (.045”-1/16”)

MC-710 (.045”-5/64”)

Gas Metal Arc Welding (GMAW)

Carbon Steel: L50/56 (.030”-1/16”)

INSTALLATION

QUICK-CONNECT "PIG-TAILS"

The RED-D-ARC 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 bottom-accessed cov­ered cable connection studs.

Attach the preferred standard user-provided Quick-connect
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.

ATTACHMENT AND ARRANGEMENT OF "PIG­TAILS"

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.):

FIGURE 1

TO POWER

SOURCE

TO

WORK

TO ELECT.

CC MODE STICK WELDING AND
GOUGING

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 (3/32”­5/32”) "low-hydrogen"

E7024/6027: JW1,3/2 (1/8”-5/16”)

"fast-fill"

Arc Air Carbon (AAC)

IN

+

INPUT

+

BOTTOM VIEW

IN

+

ELECTRODE

ELECT.

+

+

ELECT.

+

Gouging: Carbons (5/32”-3/8”)

RED-D-ARC MX350

TO POWER

SOURCE

TO ELECT.