INSTRUCTION MANUAL
Digipulse 450i
Power Source
F-15-014-F
June, 2003
This manual provides installation and operation instructions for the following Digipulse 450i cutting package:
ESAB P/N 31120 - 208/230/460 V ac, 1 or 3 phase
ESAB P/N 31238 - 575 V ac, 3 phase, 60 Hz (refer to supplement F-15-015)
ESAB P/N 31690 - 220/380/415 V ac, 3 phase, 50 Hz (refer to supplement F-15-039)
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of operation and
safe practices for electric welding equipment, we urge you to read our booklet, "Precautions and Safe Practices for
Arc Welding, Cutting, and Gouging," Form 52-529. Do NOT permit untrained persons to install, operate, or maintain
this equipment. Do NOT attempt to install or operate this equipment until you have read and fully understand these
instructions. If you do not fully understand these instructions, contact your supplier for further information. Be sure
to read the Safety Precautions before installing or operating this equipment.
Be sure this information reaches the operator.
You can get extra copies through your supplier.
USER RESPONSIBILITY
This equipment will perform in conformity with the description thereof contained in this manual and accompanying
labels and/or inserts when installed, operated, maintained and repaired in accordance with the instructions provided. This equipment must be checked periodically. Defective equipment should not be used. Parts that are
broken, missing, worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, the manufacturer recommends that a telephone or written request for service advice be
made to the Authorized Distributor from whom purchased.
This equipment or any of its parts should not be altered without the prior written approval of the manufacturer. The
user of this equipment shall have the sole responsibility for any malfunction which results from improper use, faulty
maintenance, damage, improper repair or alteration by anyone other than the manufacturer or a service facility
designated by the manufacturer.
TABLE OF CONTENTS
SECTION TITLE PAGE
PARAGRAPH
SECTION 1 DESCRIPTION ................................................................................................. 5
1.1 Introduction ....................................................................................................... 5
1.2 Specifications.................................................................................................... 5
SECTION 2 INSTALLATION................................................................................................ 6
2.1 General ............................................................................................................. 6
2.2 Unpacking and Placement ................................................................................ 6
2.3 Primary (Input) Connections.............................................................................. 6
2.4 Secondary (Output) Welding Connections ........................................................ 7
2.5 Control Interconnection ..................................................................................... 9
2.6 Optional Accessories ........................................................................................ 9
SECTION 3 OPERATION..................................................................................................... 11
3.1 Introduction ....................................................................................................... 11
3.2 Duty Cycle......................................................................................................... 11
3.3 Power Source Welding Controls ....................................................................... 11
3.4 Sequence of Operation ..................................................................................... 12
SECTION 4 MAINTENANCE ............................................................................................... 13
4.1 General ............................................................................................................. 13
4.2 Cleaning ............................................................................................................ 13
4.3 Lubrication ........................................................................................................ 13
SECTION 5 TROUBLESHOOTING ..................................................................................... 14
5.1 Troubleshooting ................................................................................................ 14
5.2 Calibration Procedure ....................................................................................... 20
SECTION 6 REPLACEMENT PARTS ................................................................................. 25
6.1 General ............................................................................................................. 25
6.2 Ordering ............................................................................................................ 25
2
SAFETY PRECAUTIONS
WARNING: These Safety Precautions are for
your protection. They summarize precautionary
information from the references listed in Addi-
tional Safety Information section. Before performing any installation or operating procedures, be sure to
read and follow the safety precautions listed below as well as
all other manuals, material safety data sheets, labels, etc.
Failure to observe Safety Precautions can result in injury or
death.
PROTECT YOURSELF AND OTHERS
Some welding, cutting, and gouging processes are noisy and require ear protection. The arc, like the sun, emits
ultraviolet (UV) and other radiation and
can injure skin and eyes. Hot metal can cause burns.
Training in the proper use of the processes and equipment is essential to prevent accidents. Therefore:
1. Always wear safety glasses with side shields in any work
area, even if welding helmets, face shields, and goggles
are also required.
2. Use a face shield fitted with the correct filter and cover
plates to protect your eyes, face, neck, and ears from
sparks and rays of the arc when operating or observing
operations. Warn bystanders not to watch the arc and not
to expose themselves to the rays of the electric-arc or hot
metal.
3. Wear flameproof gauntlet type gloves, heavy long-sleeve
shirt, cuffless trousers, high-topped shoes, and a welding
helmet or cap for hair protection, to protect against arc rays
and hot sparks or hot metal. A flameproof apron may also
be desirable as protection against radiated heat and sparks.
4. Hot sparks or metal can lodge in rolled up sleeves, trouser
cuffs, or pockets. Sleeves and collars should be kept
buttoned, and open pockets eliminated from the front of
clothing
5. Protect other personnel from arc rays and hot sparks with
a suitable non-flammable partition or curtains.
6. Use goggles over safety glasses when chipping slag or
grinding. Chipped slag may be hot and can fly far. Bystanders should also wear goggles over safety glasses.
FIRES AND EXPLOSIONS -- Heat from
flames and arcs can start fires. Hot slag
or sparks can also cause fires and explosions. Therefore:
5. Do not use equipment beyond its ratings. For example,
overloaded welding cable can overheat and create a fire
hazard.
6. After completing operations, inspect the work area to make
certain there are no hot sparks or hot metal which could
cause a later fire. Use fire watchers when necessary.
7. For additional information, refer to NFPA Standard 51B,
"Fire Prevention in Use of Cutting and Welding Processes",
available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
--
ELECTRICAL SHOCK -- Contact with live electrical parts
and ground can cause severe injury or death. DO NOT use
AC welding current in damp areas, if movement is con-
fined, or if there is danger of falling.
1. Be sure the power source frame
(chassis) is connected to the ground system
of the input power.
2. Connect the workpiece to a good
electrical ground.
3. Connect the work cable to the workpiece. A poor or
missing connection can expose you or others to a fatal
shock.
4. Use well-maintained equipment. Replace worn or damaged cables.
5. Keep everything dry, including clothing, work area, cables,
torch/electrode holder, and power source.
6. Make sure that all parts of your body are insulated from
work
and from ground.
7. Do not stand directly on metal or the earth while working in
tight quarters or a damp area; stand on dry boards or an
insulating platform and wear rubber-soled shoes.
8. Put on dry, hole-free gloves before turning on the power.
9. Turn off the power before removing your gloves.
10 . Refer to ANSI/ASC Standard Z49.1 (listed on next page)
for specific grounding recommendations. Do not mistake
the work lead for a ground cable.
ELECTRIC AND MAGNETIC FIELDS — May be dangerous.
Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding and
cutting current creates EMF around
welding cables and welding machines.
Therefore:
away from the work area or cover the materials with a
1.Remove all combustible materials well
protective non-flammable covering. Combustible materials include wood, cloth, sawdust, liquid and gas fuels,
solvents, paints and coatings, paper, etc.
2. Hot sparks or hot metal can fall through cracks or crevices
in floors or wall openings and cause a hidden smoldering
fire or fires on the floor below. Make certain that such
openings are protected from hot sparks and metal.“
3. Do not weld, cut or perform other hot work until the
workpiece has been completely cleaned so that there are
no substances on the workpiece which might produce
flammable or toxic vapors. Do not do hot work on closed
containers. They may explode.
4. Have fire extinguishing equipment handy for instant use,
such as a garden hose, water pail, sand bucket, or
portable fire extinguisher. Be sure you are trained in its
use.
1.Welders having pacemakers should consult their physician before welding. EMF
may interfere with some pacemakers.
2. Exposure to EMF may have other
health effects which are unknown.
3. Welders should use the following procedures to minimize
exposure to EMF:
A. Route the electrode and work cables together. Secure
them with tape when possible.
B. Never coil the torch or work cable around your body.
C. Do not place your body between the torch and work
cables. Route cables on the same side of your body.
D. Connect the work cable to the workpiece as close as
possible to the area being welded.
E. Keep welding power source and cables as far away from
your body as possible.
3
FUMES AND GASES -- Fumes and
gases, can cause discomfort or harm,
particularly in confined spaces. Do
not breathe fumes and gases. Shielding gases can cause asphyxiation.
Therefore:
1. Always provide adequate ventilation in the work area by
natural or mechanical means. Do not weld, cut, or gouge
on materials such as galvanized steel, stainless steel,
copper, zinc, lead, beryllium, or cadmium unless positive
mechanical ventilation is provided. Do not breathe fumes
from these materials.
2. Do not operate near degreasing and spraying operations.
The heat or arc rays can react with chlorinated hydrocarbon vapors to form phosgene, a highly toxic gas, and other
irritant gases.
3. If you develop momentary eye, nose, or throat irritation
while operating, this is an indication that ventilation is not
adequate. Stop work and take necessary steps to improve
ventilation in the work area. Do not continue to operate if
physical discomfort persists.
4. Refer to ANSI/ASC Standard Z49.1 (see listing below) for
specific ventilation recommendations.
5. WARNING: This product, when used for welding or
cutting, produces fumes or gases which
contain chemicals known to the State of
California to cause birth defects and, in
some cases, cancer. (California Health &
Safety Code
CYLINDER HANDLING -- Cylinders, if
mishandled, can rupture and violently
release gas. Sudden rupture of cylinder, valve, or relief device can injure or
kill. Therefore:
1. Use the proper gas for the process and use the proper
pressure reducing regulator designed to operate from the
compressed gas cylinder. Do not use adaptors. Maintain
hoses and fittings in good condition. Follow manufacturer's
operating instructions for mounting regulator to a compressed gas cylinder.
2. Always secure cylinders in an upright position by chain or
strap to suitable hand trucks, undercarriages, benches,
walls, post, or racks. Never secure cylinders to work
tables or fixtures where they may become part of an
electrical circuit.
3. When not in use, keep cylinder valves closed. Have valve
protection cap in place if regulator is not connected.
Secure and move cylinders by using suitable hand trucks.
Avoid rough handling of cylinders.
4. Locate cylinders away from heat, sparks, and flames.
Never strike an arc on a cylinder.
5. For additional information, refer to CGA Standard P-1,
"Precautions for Safe Handling of Compressed Gases in
Cylinders", which is available from Compressed Gas
Association, 1235 Jefferson Davis Highway, Arlington,
VA 22202.
§25249.5 et seq.)
EQUIPMENT MAINTENANCE -- Faulty or
improperly maintained equipment can
cause injury or death. Therefore:
1. Always have qualified personnel perform the installation,
troubleshooting, and maintenance work. Do not perform
any electrical work unless you are qualified to perform
such work.
2. Before performing any maintenance work inside a power
source, disconnect the power source from the incoming
electrical power.
3. Maintain cables, grounding wire, connections, power cord,
and power supply in safe working order. Do not operate
any equipment in faulty condition.
4. Do not abuse any equipment or accessories. Keep
equipment away from heat sources such as furnaces, wet
conditions such as water puddles, oil or grease, corrosive
atmospheres and inclement weather.
5. Keep all safety devices and cabinet covers in position and
in good repair.
6. Use equipment only for its intended purpose. Do not
modify it in any manner.
ADDITIONAL SAFETY INFORMATION -- For
more information on safe practices for electric
arc welding and cutting equipment, ask your
supplier for a copy of "Precautions and Safe
Practices for Arc Welding, Cutting and Gouging", Form 52-529.
The following publications, which are available from the
American Welding Society, 550 N.W. LeJuene Road, Miami,
FL 33126, are recommended to you:
1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"
2. AWS C5.1 - "Recommended Practices for Plasma Arc
Welding"
3. AWS C5.2 - "Recommended Practices for Plasma Arc
Cutting"
4. AWS C5.3 - "Recommended Practices for Air Carbon Arc
Gouging and Cutting"
5. AWS C5.5 - "Recommended Practices for Gas Tungsten
Arc Welding“
6. AWS C5.6 - "Recommended Practices for Gas Metal Arc
Welding"“
7. AWS SP - "Safe Practices" - Reprint, Welding Handbook.
8. ANSI/AWS F4.1, "Recommended Safe Practices for Welding and Cutting of Containers That Have Held Hazardous
Substances."
MEANING OF SYMBOLS - As used throughout this manual: Means Attention! Be Alert!
Your safety is involved.
Means immediate hazards which, if not
avoided, will result in immediate, serious personal injury or loss of life.
Means potential hazards which could
result in personal injury or loss of life.
Means hazards which could result in
minor personal injury.
4
PRÉCAUTIONS DE SÉCURITÉ
AVERTISSEMENT: Ces règles de sécurité ont pour objet
d’ assurer votre protection. Veillez à lire et à observer les
précautions énoncées ci-dessous avant de monter l’
équipement ou de commercer à l’utiliser. Tout défaut
d’observation de ces précautions risque d’entraîner des
blessures graves ou mortelles.
1. PROTECTION INDIVIDUELLE-- Les brûlures de la peau
et des yeux dues au rayonnement de l’arc électrique ou
du métal incandescent, lors du soudage au plasma ou à
l’électrode ou lors du gougeage à l’arc, peuvent s’avérer
plus graves que celles résultant d’une exposition
prolongée au soleil. Aussi convient-il d’observer les
précautions suivantes:
a. Portez un écran facial adéquat muni des plaques
protectrices et des verres filtrants appropriés afin de
vous protéger les yeux, le visage, le cou et les oreilles
des étincelles et du rayonnement de l’arc électrique
lorsque vous effectuez des soudures ou des coupes ou
lorsque vous en observez l’exécution.
AVERTISSEZ les personnes se trouvant à proximité de
façon à ce qu’elles ne regardent pas l’arc et à ce
qu’elles ne s’exposent pas à son rayonnement, ni à
celui du métal incandescent.
b. Portez des gants ignifugés à crispins, une tunique
épaisse à manches longues, des pantalons sans rebord,
des chaussures à embout d’acier et un casque de
soudage ou une calotte de protection, afin d’éviter
d’exposer la peau au rayonnement de l’arc électrique
ou du métal incandescent. ll est également souhaitable
d’utiliser un tablier ininflammable de façon à se protéger
des étincelles et du rayonnement thermique.
c. Les étincelles ou les projections de métal incandescent
risquent de se loger dans des manches retroussées,
des bords relevés de pantalons ou dans des poches.
Aussi convient-il de garder boutonnés le col et les
manches et de porter des vêtements sans poches à
l’avant.
d. Protégez des étincelles et du rayonnement de l’arc
électrique les autres personnes travaillant à proximité à
l’aide d’un écran ininflammable adéquat.
e. Ne jamais omettre de porter des lunettes de sécurité
lorsque vous vous trouvez dans un secteur où l’on
effectue des opérations de soudage ou de coupage à
l’arc. Utilisez des lunettes de sécurité à écrans ou
verres latéraux pour piquer ou meûler le laitier. Les
piquetures incandescentes de laitier peuvent être
projetées à des distances considérables. Les personnes
se trouvant à proximité doivent également porter des
lunettes de protection.
f. Le gougeage à l’arc et le soudage à l’arc au plasma
produisent un niveau de bruit extrêmement élevé (de
100 à 114 dB) et exigent par conséquent l’emploi de
dispositifs appropriés de protection auditive.
2. PRÉVENTION DES INCENDES-- Les projections de
laitier incandescent ou d’étincelles peuvent provoquer
de graves incendies au contact de matériaux combustibles solides, liquides ou gazeux. Aussi faut-il observer
les précautions suivantes:
a. Éloigner suffisamment tous les matériaux combustibles
du secteur où l’on exécute des soudures ou des coupes
à l’arc, à moins de les recouvrir complètement d’une
bâche non-inflammable. Ce type de matériaux comprend
notamment le bois, les vêtements, la sciure, l’essence,
le kérosène, les peintures, les solvants, le gaz naturel,
l’acétylène, le propane et autres substances combustibles semblables.
b. Les étincelles ou les projections de métal incandescent
peuvent tomber dans des fissures du plancher ou dans
des ouvertures des murs et y déclencher une ignition
lente cachée. Veiller à protéger ces ouvertures des
étincelles et des projections de métal.
c. N’exécutez pas de soudures, de coupes, d’opérations
de gougeage ou autres travaux à chaud à la surface de
barils, bidons, réservoirs ou autres contenants usagés,
avant de les avoir nettoyés de toute trace de substance
susceptible de produire des vapeurs inflammables ou
toxiques.
d. En vue d’assurer la prévention des incendies, il convient
de disposer d’un matériel d’extinction prêt à servir
immédiatement, tel qu’un tuyau d’arrosage, un seau à
eau, un seau de sable ou un extincteur portatif.
e. Une fois le travail à l’arc terminé, inspectez le secteur de
façon à vous assurer qu’aucune étincelle ou projection
de métal incandescent ne risque de provoquer
ultérieurement un feu.
3. CHOC ÉLECTRIQUE-- Le gougeage à l’arc et à l’arc au
plasma exige l’emploi de tensions à vide relativement
importantes; or, celles-ci risquent de causer des
dommages corporels graves et même mortels en cas
d’utilisation inadéquate. La gravité du choc électrique
reçu dépend du chemin suivi par le courant à travers le
corps humain et de son intensité.
a. Ne laissez jamais de surfaces métalliques sous tension
venir au contact direct de la peau ou de vêtements
humides. Veillez à porter des gants bien secs.
b. Si vous devez effectuer un travail sur une surface
métallique ou dans un secteur humide, veillez à assu-rer
votre isolation corporelle en portant des gants secs et
des chaussures à semelles de caoutchouc et en vous
tenant sur une planche ou une plate-forme sèche.
c. Mettez toujours à la terre le poste de soudage/coupage
en le reliant par un câble à une bonne prise de terre.
d. N’utilisez jamais de câbles usés ou endommagés. Ne
surchargez jamais le câble. Utilisez toujours un
équipement correctement entretenu.
e. Mettez l’équipement hors tension lorsqu’il n’est pas en
service. une mise à la masse accidentelle peut en effet
provoquer une surchauffe de l’équipement et un danger
d’incendie. Ne pas enrouler ou passer le câble autour
d’une partie quelconque du corps.
f. Vérifiez si le câble de masse est bien relié à la pièce en
un point aussi proche que possible de la zone de travail.
Le branchement des câbles de masse à l’ossature du
bâtiment ou en un point éloigné de la zone de travail
augmente en effet le risque de passage d’un courant de
sortie par des chaînes de
5
levage, des câbles de grue ou divers chemins
électriques.
g. Empêchez l’apparition de toute humidité, notamment
sur vos vêtements, à la surface de l’emplacement de
travail, des câbles, du porte-électrode et du poste de
soudage/coupage. Réparez immédiatement toute fuite
d’eau.
4. VENTILATION-- La respiration prolongée des fumées
résultant des opérations de soudage/coupage, à
l’intérieur, d’un local clos, peut provoquer des malaises
et des dommages corporels. Aussi convient-il
d’observer les précautions suivantes:
a. Assurez en permanence une aération adéquate de
l’emplacement de travail en maintenant une ventilation
naturelle ou à l’aide de moyens mécaniques. N’effectuez
jamais de travaux de soudage ou de coupage sur des
matériaux de zinc, de plomb, de beryllium ou de cadmium en l’absence de moyens mécaniques de ventilation capables d’empêcher l’inhalation des fumées
dégagées par ces matériaux.
b. N’effectuez jamais de travaux de soudage ou de
coupage à proximité de vapeurs d’hydrocarbure chloré
résultant d’opérations voisines de dégraissage ou de
pulvérisation. La chaleur dégagée ou le rayonnement
de l’arc peut déclencher la formation de phosgène -gaz particulièrement toxique -- et d’autres gaz irritants,
à partir des vapeurs de solvant.
c. Une irritation momentanée des yeux, du nez ou de la
gorge constatée au cours de l’utilisation de l’équipement
dénote un défaut de ventilation. Arrêtez-vous de travailler
afin de prendre les mesures néces- saires à
l’amélioration de la ventilation. Ne poursuivez pas
l’opération entreprise si le malaise persiste.
d. Certaines commandes comportent des canalisations
où circule de l’hydrogène. L’armoire de commande est
munie d’un ventilateur destiné à empêcher la formation
de poches d’hydrogène, lesquelles présentent un danger d’explosion; ce ventilateur ne fonctionne que si
l’interrupteur correspondant du panneau avant se trouve
placé en position ON (Marche). Veillez à manœuvrer
cette commande en vérifiant si le couvercle est bien en
place, de façon à assurer l’efficacité de la ventilation
ainsi réalisée. Ne jamais débrancher le ventilateur.
e. Les fumées produites par l’opération de soudage ou de
coupage peuvent s’avérer toxiques. Aussi est-il
nécessaire de disposer en permanence d’un dispositif
adéquat de ventilation de type aspirant, afin d’élimi-ner
du voisinage de l’opérateur tout dégagement de fumée
visible.
f. Consultez les recommandations particulières en matière
de ventilation indiquées à l’alinéa 6 de la norme Z49.1
de l’AWS.
5. ENTRETIEN DE L’ÉQUIPEMENT-- Un équipement
entretenu de façon défectueuse ou inadéquate risque
non seulement de réaliser un travail de mauvaise
qualité mais, chose plus grave encore, d’entraîner des
dommages corporels graves, voire mortels en
déclenchant des incendies ou des chocs électriques.
Observez par conséquent les précautions suivantes:
a. Efforcez-vous de toujours confier à un personnel qua-lifié
l’installation, le dépannage et l’entretien du poste de
soudage et de coupage. N’effectuez aucune réparation
électrique sur l’équipement à moins d’être qua-lifié à cet
effet.
b. Ne procédez jamais à une tâche d’entretien quelconque
à l’intérieur du poste de soudage/coupage, avant d’avoir
débranché l’alimentation électrique.
c. Maintenez en bon état de fonctionnement les câbles, le
câble de masse, les branchements, le cordon
d’alimentation et le poste de soudage/coupage. N’utilisez
jamais le poste ou l’équipement s’il présente une
défectuosité quelconque.
d. Prenez soin du poste de soudage et de coupage et des
équipements accessoires. Gardez-les à l’écart des
sources de charleur, notamment des fours, de l’humidité,
des flaques d’eau maintenez-les à l’abri des traces
d’huile ou de graisse, des atmosphères corrosives et
des intempéries.
e. Laissez en place tous les dispositifs de sécurité et tous
les panneaux de l’armoire de commande en veillant à
les garder en bon état.
f. Utilisez le poste de soudage/coupage conformément à
son usage prévu et n’effectuez aucune modification.
6. INFORMATIONS COMPLÉMENTAIRES RELATIVES À
LA SÉCURITÉ--
Pour obtenir des informations complémentaires sur les
règles de sécurité à observer pour le montage et
l’utilisation d’équipements de soudage et de coupage
électriques et sur les méthodes de travail
recommandées, demandez un exemplaire du livret N°
52529 “Precautions and Safe Practices for Arc Welding, Cutting and Gouging” publié par ESAB. Nous
conseillons également de consulter les publications suivantes, tenues à votre disposition par l’American Welding Society, 550 N.W. LeJuene Road, Miami, FL 32126:
a. “Safety in Welding and Cutting” AWS Z49.1
b. “Recommended Safe Practices for Gas-Shielded Arc
Welding “AWS A6. 1.
c. “Safe Practices for Welding and Cutting Containers That
Have Held Combustibles” AWS-A6.0.
d. “Recommended Safe Practices for Plasma Arc Cutting”
AWS-A6. 3.
e. “Recommended Safe Practices for Plasma Arc Weld-
ing” AWS-C5. 1.
f. “Recommended Safe Practices for Air Carbon Arc
Gouging and Cutting” AWS-C5. 3.
g. “Code For Safety in Welding and Cutting” CSA-Standard
W117. 2.
6
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
The Digpulse 450i is a CV/CC inverter-type power
source specifically designed and dedicated for use with
a Digipulse wire feeder or Digipulse mechanized/robotic
control. When combined, these components work together to provide a pulsed MIG system that self-adjusts
while welding to give optimum arc performance. The
Digipulse system is also designed to provide non-pulsed
digital logic needed for convenient MIG short and spray
arc welding applications.
When operated in its Constant Current (CC) setting, the
Power Source can be used for a wide range of dc Stick,
scratch-start TIG, and air-carbon arc gouging applications.
1.2 SPECIFICATIONS
Rated Output @:
....60% Duty .......................... 450 amps @ 38 V dc
....100% Duty ......................... 350 amps @ 34 V dc
Open Circuit Voltage (Max.) ......................... 72 V dc
Input Voltage ................... 230/460 V ac, 3 ph. 60 Hz
Input Current @ Rated Load ... 80 amps @ 230 V ac
................................................................................
............................................... 40 amps @ 460 V ac
Dimensions
................. 15.25" (387 mm) w x 23.0" (584 mm) d x
...................................................... 15.5" (394 mm)h
Weight .............................................. 166 lbs (70 kg)
Figure 1-1. MIG Mode - VA Curves
Figure 1-2. Duty Cycle Rating Chart
7
SECTION 2
INSTALLATION
2.1 GENERAL
Proper installation will contribute to safe, satisfactory, and trouble-free operation of the welding setup.
It is suggested that each step in this section be
studied carefully and followed as closely as possible.
2.2 UNPACKING AND PLACEMENT
A. Immediately upon receipt of the equipment,
inspect for damage which may have occurred
in transit. Notify the carrier of any defects or
damage at once.
B. After removing the components from the ship-
ping container(s), check the containers for any
loose parts. Remove all packing materials.
C. Check air passages of Power Source for any
packing materials that may obstruct air flow
through the Power Source.
D. If the equipment is not to be installed immedi-
ately, store it in a clean, dry, well-ventilated
area.
chance of nuisance (fault) tripping or damage due to
transients caused by other equipment loads such as
resistance welders, punch presses, large electric
motors, etc.
If nuisance tripping caused by transients becomes a
problem, ESAB has a "primary line conditioner" (P/
N 31102) which may be added to filter out transient
voltages . Contact your distributor for details.
Please note that the conditioner will not correct for
sustained line voltages which exceed the limits of
its rated voltage inputs.
The Power Source is designed to provide line
voltage compensation within 10 percent of the rated
230/460 volt input to maintain its rated output and
protect its power electronics. If these limits are
exceeded, serious damage to the unit could occur.
Therefore, prior to installation, it is suggested that
the proposed line circuit be checked (with a meter)
at two or three different time periods of the day to
make sure the power load does not exceed the
Power Source's input limits. If input power cannot
be maintained within the 10 percent limits, consult
your local power company or call ESAB for possible solutions.
E. The location of the welding equipment should be
carefully selected to ensure satisfactory and
dependable service. Choose a location relatively close to a properly fused supply of electrical power.
F. The Power Source components are maintained
at proper operating temperatures by forced air
drawn through the cabinet by the fan unit on the
rear panel. For this reason, it is important the
machine be located in an open area where air
can circulate freely at the front and rear openings. If space is at a premium, leave at least 1
foot of clearance between the rear of the Power
Source and wall or other obstruction. The area
around the unit should be relatively free of dust,
fumes, and excessive heat. It is also desirable
to locate the unit so the cover can be removed
easily for cleaning and maintenance.
2.3 PRIMARY (INPUT) CONNECTIONS
The Digipulse 450i Power Source is a 3-phase unit
and must be connected to a "clean-unloaded" 3phase supply power line. An unloaded line is
essential for good performance and lessens the
ELECTRIC SHOCK CAN KILL! PRECAUTIONARY MEASURES SHOULD BE TAKEN TO PROVIDE MAXIMUM PROTECTION AGAINST ELECTRICAL SHOCK. BE SURE THAT ALL POWER IS
OFF BY OPENING THE LINE (WALL) DISCONNECT SWITCH WHEN PRIMARY ELECTRICAL
CONNECTIONS ARE MADE TO THE POWER
SOURCE. TO BE DOUBLY SAFE, CHECK YOUR
INPUT LEADS WITH A VOLTMETER TO MAKE
SURE THAT ALL POWER IS OFF.
A. A line (wall) disconnect switch, with fuses or
circuit breakers, should be provided at the main
power panel (see Figure 2-2). The customer
can either use the factory-supplied input power
cable (No. 6 AWG, 4/c, type SO (90 °C), 12-ft
lg) or provide his own input power leads. The
primary power leads should be insulated copper
conductors and include a 3-phase power lead
with one ground wire. The wires may be heavy
rubber covered cable or run in a solid or flexible
conduit. Refer to Table 2-1 for recommended
input conductors and line fuse sizes.
8
SECTION 2
Table 2-1. Recommended Sizes for
Input Conductors and Line Fuses
INSTALLATION
Rated Load
Volts Amps
230
460
*Sizes per National Electric Code for 90°C rated copper conductors
@ 30 °C ambient. Not more than three conductors in raceway or
cable. Local codes should be followed if they specify sizes other
than those listed above.
B. As shipped, the Power Source is set up for 460
volt input power. If using a 230 volt input, two
links on the input terminal board (located inside
the unit) must be repositioned as marked on the
plate (see Figure 2-1). The input terminal board
connections will be visible after removing the top
cover.
C. The factory-supplied input power cable is con-
nected to the Power Source ON-OFF switch.
However, if the customer wishes to connect his
own input power leads, proceed as follows:
With the top cover and left side panel removed,
thread the input conductor cable from the wall
disconnect switch through the strain relief hole
in the rear panel. Connect the primary leads to
the Line Switch (LS) for either single- or 3phase input and the ground lead (green) to the
stud on the base of the unit as shown in Figure
2-2. After making sure the connections are
secured, tighten the strain relief coupling to
secure the input cable.
IT IS OF THE UTMOST IMPORTANCE THAT
THE CHASSIS BE CONNECTED TO AN APPROVED ELECTRICAL GROUND TO PREVENT
ACCIDENTAL SHOCK. TAKE CARE NOT TO
CONNECT THE GROUND WIRE TO ANY OF
THE PRIMARY LEADS.
80
40
Input &
Gnd.
Conductor*
CU/AWG
6
8
Time-Delay
Fuse Size
Amps
100
50
Figure 2-1. Input Voltage Terminal Board
(TB) Connections
D. Recheck all connections to make sure they are
tight, well insulated, and properly connected.
2.4 SECONDARY (OUTPUT) WELDING
CONNECTIONS
BEFORE MAKING ANY CONNECTIONS TO THE
POWER SOURCE OUTPUT TERMINALS, MAKE
SURE THAT ALL PRIMARY INPUT POWER TO
THE UNIT IS DEENERGIZED (OFF) AT THE
CUSTOMER'S DISCONNECT SWITCH.
A. Digipulse MIG Setup (see Figure 2-2). This
Power Source is designed to provide MIG
welding operating characteristics only when the
J2 control receptacle is "vacant" (meaning no
accessories are plugged in) or, if the remote
HC-3B Hand Control (P/N 33838) is plugged in.
The Process Switch must be set in the DigitalMIG (center) position for Digipulse controls.
Additionally, proper operation of the Power
Source depends on the use of copper output
cables that are insulated, of adequate size, in
good condition, and properly connected to the
machine using the jack plug connectors provided with the Power Source. It is recommended
only 4/0 welding output cable be used regardless of length and current to be used, and that
these cables be kept as short as possible (Total
length including work and electrode leads should
not exceed 100 feet. Beyond this distance,
there will be performance deterioration. Consult
with the factory if you have an application of this
nature.)
Particular attention should be paid to high
resistance in the welding circuit; specifically,
the work cable/circuit and water-cooled torch
cable. It is recommended that the Power
9
SECTION 2
INSTALLATION
Source/Wire Feeder and workpiece be placed
as close together as possible to limit resistance
in the welding circuit. High resistance in the
welding circuit can cause performance deterioration (loss of "heat" input, popping of weld
puddle, bushy arcs, etc.). Ensure the work
cable is large enough (refer to Table 2-2), kept
as short as possible, properly insulated, securely connected to the workpiece, and that all
connections are clean and tightly secured. If a
separate work circuit is used (such as in
mechanical fixturing, shipbuilding, robot
fixturing, etc.), make sure the work circuit is
secure and presents a low resistance path to the
flow of welding current. Also, the power cable
on a water-cooled torch is normally subject to
gradual deterioration and increased resistance
due to corrosion. This leads to poor performance as described above. To assure good
torch performance, the water-cooled power
cable should be replaced periodically.
The welding output receptacles are located on
the front panel; one negative (-) and one positive
(+) receptacle. Two male plug connectors (P/
N 950693) are supplied with the Power Source
for attachment to customer supplied 4/0 welding
cables (see Figure 2-2). This Power Source is
designed for conventional and pulsed MIG
spray arc applications using Direct Current
Reverse Polarity (DCRP) setup. In a DCRP
setup, the torch or electrode is positive (+), and
the workpiece is negative (-).
B. Stick/Scratch-Start TIG/ Arc Gouging Setup
(see Figure 2-3). These processes require
Figure 2-2. MIG Interconnection Diagram
10
SECTION 2
constant current (CC) type curve characteristics for proper operation. These characteristics
are only provided when one of the remote
accessories (FC-5, TC-2) is plugged into the J2
receptacle or when the remote HC-3 Hand
Control is connected to J2 and its Process
Switch is set in the CC-TIG/Stick position.
Select the desired welding mode, accessories,
and polarity as shown in figure 2-3. The output
cables can be connected for DCRP or DCSP :
meaning that for a DCRP setup, the electrode
holder/torch is POS (+) and the work is NEG (); whereas for a DCSP setup, the electrode
holder/torch is NEG (-) and the work is POS (+).
regardless of your secondary welding cable setup
(dcrp or dcsp), in order to prevent electrical shock,
it is necessary that you connect the workpiece to an
approved electrical (earth) ground. The work cable
lead is not a ground lead. it is used to complete the
welding circuit between the Power Source and the
workpiece. this connection (at the workpiece) must
be made to a clean, exposed metal surface that is
free of paint, rust, mill scale, etc. a separate
connection is required to ground the workpiece to
an approved earth ground. the work cable should
be the same rating as the torch/electrode cable
lead.
INSTALLATION
Table 2-2. Recommended Welding Cable Sizes
Welding Total Length (Feet) of Cable in Weld Circuit*
Current 50 100 150 200 250
100
150
200
250
300
400
500
* Total cable length includes work and electrode cables. Cable
** Cam-Lock jack plug connectors will not accept smaller than #2
2.5 CONTROL INTERCONNECTION
Ensure all TIG/Stick remote control accessories are
physically disconnected from receptacle J2 when
making a Digipulse setup.
6**
4**
3**
2
1
2/0
3/0
size is based on direct current, insulated copper conductors,
100% duty cycle, and a voltage drop of 4 or less volts. The welding
cable insulation must have a voltage rating that is high enough to
withstand the open circuit voltage of the machine.
gauge cable. Also, remember that for MIG-Pulse conditions we
recommend only 4/0 cable be used due to pulse-peak currents.
4**
3**
1
1/0
2/0
3/0
3/0
3**
1
1/0
2/0
3/0
4/0
4/0
2
1/0
2/0
3/0
4/0
4/0
--
1
2/0
3/0
4/0
4/0
--
--
Proper operation of the Power Source depends to a
great extent on the use of copper output cables that
are insulated, adequately sized, in good condition
and properly connected to the machine using the
jack plug connectors provided. It is recommended
that the output cables be kept as short as possible,
placed close together, and be of adequate current
carrying capacity. The resistance of the output
cables and connections cause a voltage drop which
is added to the voltage of the arc. Excessive cable
resistance can reduce the maximum current output
of the Power Source. Refer to table 2-2 to select
the recommended output cable size.
Because the Digipulse 450i is only dedicated for
use with Digipulse type Wire Feeders and mechanized/Robotic Controls, the specific hookup and
interconnecting control cable(s) part numbers will
only be covered in the instructional booklets for
those Controls/Wire Feeders as follows:
F-15-012 Digipulse Wire Feeder
F-15-013 Teach Mode Operating Instructions
for Teach Option
2.6 OPTIONAL ACCESSORIES
To avoid duplication of MIG accessories which may
or may not be required for the various Digipulse
systems, please refer to the individual Digipulse
Wire Feeder/Control instruction booklets provided
for your system. For applicable Stick/TIG accessories, refer to figure 2-3.
11
SECTION 2
INSTALLATION
Figure 2-3. Stick/Scratch-Start TIG/Arc Gouging Interconnection Diagram
12
SECTION 3
OPERATION
3.1 INTRODUCTION
This section is intended to familiarize personnel
with the operational procedures applicable to the
Digipulse 450i Power Source. Information contained
in this section should be read carefully before
operation of the Power Source.
NEVER, UNDER ANY CIRCUMSTANCES, OPERATE THE POWER SOURCE WITH THE COVER
OR SIDE PANELS REMOVED. IN ADDITION TO
THE SAFETY HAZARD, IMPROPER COOLING
MAY CAUSE DAMAGE TO INTERNAL COMPONENTS. ALSO MAKE SURE YOU ARE ADEQUATELY PROTECTED BEFORE WELDING.
WELDING HELMET, GLOVES, SAFETY GLASSES,
AND EAR PROTECTION SHOULD ALWAYS BE
WORN.
3.2 DUTY CYCLE
Duty cycle is defined as the ratio of load time to
total time. Standard current ratings are based on a
10-minute cycle. The Digipulse 450i Power Source
has two duty cycles; a 60% duty cycle rating which
allows 450i amperes @ 38 V dc, and a 100% duty
cycle rating which allows 350 amperes @ 34 V dc
(see Figure 2-2). The 100% duty cycle means that a
350 ampere rated load can be applied continuously
with no adverse effect on the Power Source. The
60% duty cycle rating means that the 450i ampere
rated load can be applied for a total of 6 minutes
and shut off for a total 4 minutes in a 10-minute
period. If the welding current is decreased, the duty
cycle can be increased. Conversely, if the welding
current is increased, the duty cycle must be decreased.
3.3 POWER SOURCE WELDING
CONTROLS
A. On-Off Line Switch (LS). Placed in the "on"
position, this switch (located on the rear panel)
provides primary input power to start the cooling
fan motor and energize the secondary control
circuitry. Power light (PL1) on the front panel
should illuminate.
B. Digital Ammeter. This instrument provides
direct reading of the average welding current.
C. Troubleshooting Lights.
1. Temperature (PL2). This will light if
components in the Power Source
overheat. The contactor will then
deenergize. Allow the Power Source to
cool with the line switch in the "ON"
position (the fan will help cool the
Power Source) before continuing
welding operations when light goes off.
2. Fault (PL3). This light functions as a
visual detector for two specific fault
conditions: overcurrent or over/
undervoltage indication. In either case,
if a fault is detected in the inverter
bridge, the contactor will deenergize
and the Power Source will stop welding.
If an overcurrent condition caused the
problem, the fault light will energize and
remain "steady-on." Do not attempt to
restart welding (refer to section 5). If
an over or undervoltage condition
occurs, the fault light will flash. Since
this can often be caused by a transient,
retry the torch switch to resume welding. If tripping continues, stop and refer
to section 5.
D. Inductance Control Potentiometer (ICP).
This control allows the operator to set and
regulate the desired amount of inductance
required for standard MIG short arc welding
operations. Variable control allows the operator
to fine tune the inductance needed to make the
weld puddle more fluid and minimize the weld
spatter produced during MIG short arc applications. When short arc welding stainless steel,
high values of inductance should be used with
A1025 helium rich shielding gas. This potentiometer should be set to minimum for all pulse
and standard spray arc welding applications.
E. Digital MIG Control Receptacle (J1). This 19-
pin remote control receptacle receives a mating
connector from the Digipulse Wire Feeder or
other Digipulse Controls (see Figure 2-2).
F. TIG/Stick Control Receptacle (J2). This 8-pin
remote control receptacle, located on the rear
panel, receives a mating connector from the
TIG/Stick accessories (see Figure 2-3).
13
SECTION 3
OPERATION
G. Reset Circuit Breaker (CB). A 10 ampere
circuit breaker (on the rear panel) provides
protection to the 115 volt control circuit. If an
overload occurs, the breaker will trip and suspend all operation. To restore service, depress
the breaker button to reset the circuit.
H. Auxiliary 115 Volt Receptacle (J3). This re-
ceptacle supplies 5 amperes of 115 V/5 A power
for auxiliary equipment.
I. Welding Output Receptacles. Two output
receptacles are located on the front panel - one
negative (-) and one positive (+) (see Figure 22 and 2-3).
3.4 SEQUENCE OF OPERATION
never, under any circumstances, operate the Power
Source without cover or panels in place. in addition
to the safety hazard, improper cooling may cause
overheating which will damage the internal components. also, make sure you are adequately protected before welding. welding helmet, gloves,
safety glasses, and ear protection should always be
worn.
A. Digipulse MIG Welding
5. Set the variable inductance control (on the front
panel) to provide the amount of inductance
desired for MIG short arc welding. For MIG
spray arc and pulsed MIG welding, this
control should be set at MINIMUM.
6. For remaining Digipulse Wire Feeder or
Digipulse Control operations, refer to the appropriate instruction booklet supplied for your
particular system.
B. Stick/Scratch-Start TIG Welding
1. Depending on the process being used, make all
secondary output connections to the Power
Source output receptacles (refer to Figure 2-
3).
2. Connect appropriate control accessories to
receptacle J2 (refer to Figure 2-3).
3. After the primary input connections have been
made, close the main wall disconnect switch
or circuit breaker.
4. Place the Power Source ON-OFF line switch
(on the rear panel) to the ON position. This will
start the cooling fan and apply power to the
control circuitry as indicated by the illuminated
POWER pilot light on the front panel.
1. Make all secondary output connections to the
Power Source output receptacles as described
in section 2 (see Figure 2-2) and as shown in
the appropriate Wire Feeder and/or Control
instruction booklets.
2. Make the necessary control connections to
receptacle J1 as described in section 2 (see
Figure 2-2) and J2, if necessary. Make sure that
FC-5B or TC-2B is unplugged from J2, or if HC3B is plugged in, the Process Switch is in the
Digital-MIG (center) position.
3. After the primary input connections have been
made in accordance with section 2, close the
main wall disconnect switch or circuit breaker.
4. Place the Power Source ON-OFF line switch
(on rear panel) to the ON position. This will start
the cooling fan and apply power to the control
circuitry as indicated by the illuminated POWER
pilot light on the front panel.
Ensure the contactor control switch on the TC-2B torch
control or the Stick control pendant is in its OFF
position (until you're ready to weld); otherwise, the
electrode will be energized and may cause a short or
electrical shock.
5. The variable inductance control need not be set
for these processes because it is isolated from
this circuit.
6. Full range current control is provided and regulated by the potentiometer on the selected
remote controls.
7. To establish the welding arc, position the torch/
electrode near the workpiece. Close the remote
torch/foot control or turn ON the pendant. This
will energize the solid-state contactor and pro-
14
SECTION 4
MAINTENANCE
4.1 GENERAL
If the Power Source does not operate properly, stop
work immediately and investigate the cause of the
malfunction. Maintenance work must be performed
by an experienced person, and electrical work by a
trained electrician. Do not permit untrained persons
to inspect, clean, or repair this equipment. Use
only recommended replacement parts.
ENSURE THE WALL DISCONNECT SWITCH OR
CIRCUIT BREAKER IS OPEN BEFORE ATTEMPTING ANY INSPECTION OR WORK ON THE
INSIDE OF THE POWER SOURCE. ALWAYS
WEAR SAFETY GOGGLES WITH SIDE SHIELDS
WHEN BLOWING OUT THE POWER SOURCE
WITH THE LOW PRESSURE AIR.
4.2 CLEANING
Since there are no moving parts (other than the fan)
in the Power Source, maintenance consists mainly
of keeping the interior of the cabinet clean. Periodically, remove the cover from the cabinet and,
wearing proper eye protection, blow accumulated
dust and dirt from the air passages and the interior
components using clean low pressure air. It is
imperative that the air passages to the interior of
the unit be kept free of dirt accumulation to ensure
adequate circulation of cooling air; especially, over
the rectifier bridge plates. The length of time
between cleaning will depend on the location of the
unit and the amount of dust in the atmosphere.
4.3 LUBRICATION
Fan motors with oil tubes located on the side of the
motor require lubrication after 1 year of service.
Motors without oil tubes are permanently lubricated
for life and should not require any attention.
15
SECTION 5
TROUBLESHOOTING
5.1 Troubleshooting
ENSURE ALL PRIMARY POWER TO THE POWER
SOURCE HAS BEEN EXTERNALLY DISCONNECTED. OPEN WALL DISCONNECT SWITCH
OR CIRCUIT BREAKER BEFORE ATTEMPTING
INSPECTION OF WORK INSIDE OF THE POWER
SOURCE.
CAPACITORS CAN EXPLODE CAUSING PERSONAL INJURY. TO AVOID INJURY, CAREFULLY
READ AND DO THE FOLLOWING:
THE SUBJECT WARNING CONCERNS THE FOUR
POWER FILTERING CAPACITORS MOUNTED
BEHIND POWER BOARD #1 AND #2 (FOR LOCATION, SEE FIGURE 6-3).
This potential hazard exists when the side panels are removed
and power is ON. This should only occur when troubleshooting the Power Source.
Safe troubleshooting practice requires a systematic procedure
as follows:
1. Disconnect primary input power to Power Source.
2. Remove panels and perform visual inspection for
obvious problems; loose wiring and plug connections,
damaged or discolored components, etc.
3. Perform resistance checks described in the following
tables.
4. With input power deenergized and side panels removed, locate the Input Bridge Module (IBR) (see
Figures 5-1 and 6-5). Using the existing wiring diagram (Figure 5-4), disconnect and tape the large gray
leads attached to terminals IBR (+) and IBR (-). This
will prevent high voltage input to power boards #1 and
#2, eliminating the potential hazard while performing
the low voltage checks in step 5.
NOTE
High voltage checks, listed in the following tables, must be
performed with the side panels installed and IBR leads
connected. To distinguish the high voltage checks (from low
voltage) we have indicated these readings with the following
symbol H.V.
5. Apply input power to the Power Source, and perform
the low voltage checks described in the following
tables.
6. After the low voltage checks are completed, disconnect input power to Power Source and reconnect IBR
(+) and (-) leads to module, and reinstall the unit's side
panels.
7. With the side panels in place, reapply input power to
the Power Source and perform high voltage checks
(designated by
)listed in the following tables.
H.V.
A. Digipulse Wire Feeder or Control
If it is determined that the Wire Feeder is operating
improperly, refer to the troubleshooting information
located in booklet F-15-012.
B. Digipulse Power Source
If the Power Source is operating improperly, the
following troubleshooting information may be used
to locate the source of the problem.
Check the problem using the following troubleshooting guide. The potential problems are listed in
"most probable" order, and the remedy may be quite
simple. If the cause cannot be located quickly,
open up the unit and perform a simple visual
inspection of all components and wiring. Check for
secure terminal and plug connections, loose or
burned wiring or components, bulged or leaking
capacitors, or any other sign of damage or discoloration. Always follow this general rule -- Do not
replace a printed circuit (PC) board until you have
made all of the checks listed in the following guide.
Always put the power switch in its OFF position
before removing or installing a PC board. Take
great care not to grasp or pull on components when
removing a PC board and always place a removed
board on a static-free surface. If a PC board is
determined to be the problem, check with your
ESAB supplier for a replacement. Provide the
distributor with the part number of the board, as well
as the serial number of the Power Source. Do not
attempt to repair the board yourself. Warranty
on a PC board will be null and void if repaired by
16
SECTION 5
TROUBLESHOOTING
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE CIRCUIT CHECKS
Unit inoperative - fan
does not run
Blows input line fuses Defective Input Bridge (IBR)
No open circuit
voltage
Single-phase operation
Incorrect linkages on voltage changeover
board
Defective Line Switch (LS)
Incorrect linkages on voltage changeover
board
Defective PB1/PB2
115 V ac circuit breaker tripped
MIG mode operation
1. Stick pendant/control plugged into
J2
2. No contactor signal from wire
feeder/control
STICK mode operation
1. No contactor signal from
pendant/control
Check incoming power to unit - all three
phases
Check links on voltage changeover
terminal board
Perform continuity check on Line Switch
See IBR Troubleshooting
Check links on voltage changeover
terminal board
See PB1/PB2 Troubleshooting
Check circuit breaker and reset if tripped
Check J2 and disconnect pendant/foot
control
Check MIG contactor signal - see
Inverter Control Board troubleshooting
Check STICK contactor signal - see
inverter control troubleshooting
No open circuit
voltage
Excessive open circuit
voltage
Thermal overload Exceeding duty cycle rating
Defective SCR1/R1
Missing bias voltage to Inverter Control
Board (ICB)
False thermal indication to ICB
Defective ICB
Defective resistor/capacitor across Output
Bridge (OBR)
Exceeding max rated ambient
temperature
See SCR1 troubleshooting
See ICB troubleshooting
See ICB troubleshooting
Replace ICB
Check components R4, C7, R5, C8
See duty cycle rating chart
40 °C (104 °F)
17
SECTION 5
TROUBLESHOOTING
TROUBLESHOOTING GUIDE - Continued
PROBLEM POSSIBLE CAUSE CIRCUIT CHECKS
Flashing fault indicator Input voltage not within +15% and -10% of
rated requirements
Excessive line impedance
Defective Inverter Control Board (ICB)
Continuous fault
indicator
Low welding output Single-phase operation
Defective PB1/PB2
Defective Output Bridge Module (OBR1-4)
CT1/CT2 lead open
Missing shunt signal to Inverter Control
Board (ICB)
Defective ICB
Excessive welding cable length
Check incoming voltage to unit - all three
phases
Check voltage TB-1 (+) to TB-4(-). See
IBR troubleshooting
Replace ICB
See PB1/PB2 troubleshooting
See OBR troubleshooting
Disconnect P4 connector to inverter
control and make continuity check P4-1
to P4-2/P4-4 to P4-5
See ICB troubleshooting
Replace ICB
Check incoming power to unit - all three
phases
Recommend max cable length (work and
torch) of 100 ft.
Excessive welding
output
Too small a size welding cable being
used
High resistance torch power cable
Inverter Control Board (ICB) calibration
Defective ICB
Missing arc voltage feedback to Inverter
Control Board (ICB)
ICB calibration
Defective ICB
18
Recommend 4/0 cable for Mig
applications
Replace torch if defective/use torch with
voltage pickup lead
See ICB troubleshooting
Replace ICB
See ICB troubleshooting
See ICB troubleshooting
See ICB troubleshooting
SECTION 5
TROUBLESHOOTING
TROUBLESHOOTING GUIDE - Continued
PROBLEM POSSIBLE CAUSE CIRCUIT CHECKS
Amp Meter blank or
reads incorrect
Missing +5 V at Inverter Control Board
(ICB)
See ICB troubleshooting
Shunt calibration
Defective ICB
Defective meter
C. Power Boards, PB1/PB2, Troubleshooting (See
Figures 5-1 and 5-2)
Make sure input power is disconnected (OFF)
and voltage between T1 and T2 is zero.
Resistance Checks
(+)Probe (-)Probe Measurement
Drain-1 Source-1 5k ohms nominal*
Source-1 Drain-1 diode forward drop**
Gate-1 Source-1 1k ohms nominal*
Check millivolt drop across shunt should read 10±0.3 mV per 100 amps
output
Replace ICB
Replace meter
Voltage Checks (T.S. deenergized)
(+) Probe (-) Probe Measurement
TB-1(+) TB-3(-) 324 V dc
TB-2(+) TB-4(-) 325 V dc
H.V.
H.V.
Gate-1 Source-1 -12 V dc
Gate-2 Source-2 -12 V dc
P1-1 P1-3 24 V ac
P1-1 P1-2 12 V ac
P1-2 P1-3 12 V ac
P1-8 P1-10 24 V ac
P1-8 P1-9 12 V ac
P1-9 P1-10 12 V ac
Drain-2 Source-2 5k ohms nominal*
Source-2 Drain-2 diode forward drop**
Gate-2 Source-2 1k ohms nominal*
* Using meter high impedance diode scale.
**Using meter low impedance diode scale.
19
SECTION 5
TROUBLESHOOTING
D. Input Bridge, IBR, Troubleshooting (See Figure
5-1)
Resistance Checks
(+) Probe (-) Probe Measurement
IBR-1,2,3 IBR (+) diode forward
drop**
IBR (+) IBR-1,2,3 open*
IBR (-) IBR-1,2,3 diode forward
drop**
IBR-1,2,3 IBR (-) open *
*Using meter high impedance diode scale.
**Using meter low impedance diode scale.
TB-1(+) 375-290 V dc @ 230 V ac
(+15%/-10%)
TB-4(-) 750-580 V dc @ 460 V ac
(+15%/-10%)
F. SCR1 Troubleshooting (See Figure 5-1)
H.V.
H.V.
E. Output Bridge, OBR, Troubleshooting (See
Figure 5-2)
Resistance Checks
Anode-1 Cathode diode forward
drop**
Anode-2 Cathode diode forward
drop**
Cathode Anode-1 open*
Cathode Anode-2 open*
*Using meter high impedance diode scale.
**Using meter low impedance diode scale.
NOTE
If any of the above readings are incorrect, remove
the bus bars and check modules OBR1-4 individually. Replace modules which are defective.
Resistance Checks
SCR1-A SCR1-K 5 ohms If reads open, then replace R1
If reads short, then replace SCR-1
SCR1-G SCR1-K diode forward drop (low impedance using diode scale)
Voltage Checks
SCR1-G SCR1-K 0 V dc Torch switch deenergized
0.6 V dc Torch switch energized - if missing, check Inverter
Control
20
SECTION 5
CAPACITOR MOUNTING BRACKETS
(BEHIND BOARD) *
T3, T4, POWER CABLE CONNECTIONS *
TROUBLESHOOTING
P1, CONTROL PLUG *
*To replace Power Boards (PB-1 & PB-2), Disconnect cables from T1-T4, Disconnect
control plug P1, loosen capacitor mounting brackets behind board, remove and retain
transistor mounting screws and two mounting screws at bottom of board.
UNDER ANY CIRCUMSTANCES, REMOVE OR LOOSEN ISOBARS ATTACHED TO HEAT
SINK!
T1, T2, POWER CABLE CONNECTIONS *
(TYP.) TRANSISTOR MOUNTING *
SCREW (TOTAL-16)
ISOBAR, TYPICAL EACH SIDE *
P.C. BOARD MOUNTING SCREW, TYPICAL EACH SIDE *
Torque Specifications
IBR ¶
Case to Heatsink - 40 lb in.
Terminals - 25 lb. in.
PA2 - Transistors¶
Case to Isobar - 10 lb.in.
When replacing the
components, make
sure mounting
surfaces are clean.
Coat surfaces with
Dow-Corning #340
silicon heat sink
compound or
equivalent. All
hardware must be
torqued to above
specifications.
Figure 5-2. Right Side Power/Control Components (PB-2, OBR-1,2,3,4)
P1, CONTROL PLUG *
CAPACITOR MOUNTING BRACKETS
(BEHIND BOARD) *
NEVER,
*To replace Power Boards (PB-1 & PB-2), Disconnect cables from T1-T4, Disconnect
control plug P1, loosen capacitor mounting brackets behind board, remove and retain
transistor mounting screws and two mounting screws at bottom of board.
UNDER ANY CIRCUMSTANCES, REMOVE OR LOOSEN ISOBARS ATTACHED TO HEAT
SINK!
Torque Specifications
IBR ¶
Case to Heatsink - 40 lb in.
Terminals - 25 lb. in.
SCR1¶
Case to Heatsink - 25 lb. in.
Terminals -25 lb. in.
PA1 - Transistors¶
Case to Isobar - 10 lb.in.
When replacing the
components, make
sure mounting
surfaces are clean.
Coat surfaces with
Dow-Corning #340
silicon heat sink
compound or
equivalent. All
hardware must be
torqued to above
specifications.
T1, T2, POWER CABLE CONNECTIONS *
(TYP.) TRANSISTOR MOUNTING *
SCREW (TOTAL-16)
ISOBAR, TYPICAL EACH SIDE *
NEVER,
P.C. BOARD MOUNTING
SCREW, TYPICAL EACH SIDE *
Figure 5-1. Left Side Power/Control Components (PB-1, SCR1, IBR, R1)
T3, T4, POWER CABLE CONNECTIONS *
21
SECTION 5
G. Inverter Control Board, ICB, Troubleshooting (See Figure 5-3)
Voltage Checks
(+) Probe (-) Probe Measurements
P5-8 P5-9 18 V ac AC Bias
P5-8 P5-10 36 V ac AC Bias
P5-6 P2-9 12 V dc DC Bias
P5-5 P2-9 -12 V dc DC Bias
P5-3 P1-6 5 V dc Digital Meter Bias
P5-1 P2-9 10 V dc DC Bias
P4-7 P4-8 115 V ac MIG Contactor Signal
P4-9 P4-10 24 V ac Stick Contactor Signal
TROUBLESHOOTING
P2-10 P3-1 72 V dc Arc Voltage - open circuit
P1-1 P1-2 10 ±0.3 mV Shunt Signal/100 amps
P1-4 P1-5 10 ±0.3 mV Meter Signal/100 amps
P2-4 P2-3 1.3 to 0 V dc Inductance Control (Min to Max)
P3-3 P2-2 12 V dc MIG Mode Select
0 V dc Stick Mode Select
P3-2 P2-9 12 V dc Pulsed MIG Select
0 V dc STD MIG Select
P3-9 P3-10 0 V dc Thermal-Normal
12 V dc Thermal-Overload
H.V.
5.2 CALIBRATION PROCEDURE
The following calibration should be performed after confirming the above voltage checks. Use a calibrated
external means of measuring output voltage and current.
The Wire Feeder should be set to schedule zero and in the Synergic/Spray Arc mode (Digipulse 450i Wire
Feeder control always operates in the Synergic mode.)
To set the Wire Feeder control to schedule zero, depress the WIRE DIA./MATL. key and simultaneously hold
down the IPM DEC key position for 2.5 seconds until a zero appears in the IPM window. Release both switch
keys and set the following data in the IPM and VOLTS window as described below.
Connect voltmeter between TP1 and P2-9. With torch deenergized, adjust the
offset voltage to read 0±10 mV by
means of R44.
22
SECTION 5
Set 0.1 in the VOLTS window and 40 in the IPM window. Short circuit the contact tip to the work piece and
energize the torch switch.
P2-8 P2-9 0 V dc If these voltages are unavailable, refer to the Wire
P1-10 P2-9 2 V dc Feeder booklet for troubleshooting procedures.
Output Current 45±5 amps Current can be trimmed by means of R38.
Set 3.0 in the VOLTS window and 0 in the IPM window. Short circuit the contact tip to the work piece and
energize the torch switch.
P2-8 P2-9 3 V dc If these voltages are unavailable, refer to the Wire
P1-10 P2-9 0 V dc Feeder booklet for troubleshooting procedures.
Output Current 400±5 amps Current can be trimmed by means of R3.
TROUBLESHOOTING
TP1
TP2
Figure 5-3. Inverter Control Board (ICB) (Top View Layout)
23
Figure 5-4. Digipulse 450i Schematic Diagram - 208/230/460 V, 3 Phase, 60 Hz
D-31121-J
24
Figure 5-5. Digipulse 450i Wiring Diagram - 230/460 V, 3 Phase, 60 Hz (Sheet 1 of 2)
D-31122-K
25
Figure 5-5. Digipulse 450i Wiring Diagram - 230/460 V, 3 Phase, 60 Hz (Sheet 2 of 2)
D-31122-K
26
SECTION 6
REPLACEMENT P ARTS
6.1 GENERAL
Replacement Parts are illustrated on the following
figures. When ordering replacement parts, order by
part number and part name, as illustrated on the
figure. DO NOT ORDER BY PART NUMBER
ALONE.
Always provide the series or serial number of the
unit on which the parts will be used. The serial
number is stamped on the unit nameplate.
6.2 ORDERING
To assure proper operation, it is recommended that
only genuine ESAB parts and products be used with
this equipment. The use of non-ESAB parts may
void your warranty.
Replacement parts may be ordered from your ESAB
distributor or from:
ESAB Welding & Cutting Products
Attn: Customer Service Dept.
PO Box 100545, Ebenezer Road
Florence, SC, 29501-0545
Be sure to indicate any special shipping instructions
when ordering replacement parts.
To order parts by phone, contact ESAB at 1-803664-5540 or 4460. Orders may also be faxed to 1800-634-7548. Be sure to indicate any special
shipping instructions when ordering replacement
parts.
Refer to the Communication Guide located on the
last page of this manual for a list of customer
service phone numbers.
27
10
1
2
3
$
4
ITEM
NO.
1
2
3
4
5
6
7
8
9
10
QTY
REQ.
1
2
1
1
1
1
2
1
1
1
1
',*,38/6(L
9
8
Figure 6-1. Digipulse 450i Power Source (Front View)
PART
NO.
951031
951526
951032
951795
951042
2062018
950814
13730611
31129
950694
13733935
31124
32059
31128
32056
31136
31130
LAMP, POWER, GREEN
LAMP, RED
METER, DIGITAL
INDUCTOR CONTROL POT.
KNOB (P/O ITEM NO. 4)
RIGHT SIDE PANEL
FEMALE WELD CONNECTOR
FRONT PANEL, SILKSCREENED
LEFT SIDE PANEL
CONTROL PANEL, SILKSCREENED
TOP PANEL
DESCRIPTION
326
5
1(*
6
7
CIRCUIT
SYMBOL
PL1
PL2, PL3
DPM
ICP
28
REF: MATCHED
SET CAPACITORS
ARE PART OF PB1
AND PB2.
1
2,3
ITEM
NO.
1
2
3
QTY
REQ.
1
1
1
1
1
Figure 6-2. Digipulse 450i Power Source (Top View)
PART
NO.
31134
31135
2062211
31133
951041
CONTROL TRANSFORMER (MOUNTED ON
CHASSIS BASE UNDER FAN MOTOR)
INDUCTOR ASSY (MOUNTED ON FRONT
PART OF CHASSIS BASE)
THERMAL SWITCH (180°C) (P/O ITEM NO. 2)
MAIN TRANSFORMER (MOUNTED ON TOP
OF INDUCTOR ASSY)
TERMINAL BLOCK, 4-POS. (P/O ITEM NO. 3)
DESCRIPTION
29
CIRCUIT
SYMBOL
CTR1
IND
TS2
MTR
T2
1
ITEM
NO.
1
2
QTY
REQ.
1
1
Figure 6-3. Digipulse 450i Power Source (Top View)
PART
NO. DESCRIPTION
31143
31400
TERMINAL BOARD, SCREEN PRINTED
PC BOARD ASSY, INVERTER CONTROL
30
2
CIRCUIT
SYMBOL
TB
ICB
1
5
ITEM
NO.
1
1
4
2
5
3
6
4
7
5
6
7
8
4
QTY
REQ.
1
1
1
1
1
1
1
1
3
Figure 6-4. Digipulse 450i Power Source (Left Side View)
PART
NO. DESCRIPTION
674991
950702
951023
17250005
951022
951313
951056
31154
PC BOARD ASSY, POWER
CAPACITOR
SCR MODULE
RESISTOR
INPUT BRIDGE MODULE
CAPACITOR
INSULATOR,
ISOBAR, ALUMINUM
ISOBAR
7,8
2
CIRCUIT
SYMBOL
PB1
C9
SCR1
R1
IB R
31
10
1
3
4
5
6
3,9
ITEM
NO.
1
2
3
4
5
6
7
8
9
10
11
QTY
REQ .
1
2
3
1
1
1
1
1
1
1
4
8
7
11
2
Figure 6-5. Digipulse 450i Power Source (Right Side View)
PART
NO. DESCRIPTION
674991
17725005
950516
33938
993717
635686
951085
950702
17282010
31132
951184
PC BOARD ASSY, POWER
RESISTOR
CAPACITOR
CHOKE COMMON MODE
TRANSFORMER
TERMINAL STRIP, 8-POS
THERMAL SWITCH (80°C)
CAPACITOR, .01uF, 125V
RESISTOR, 10 OHM 100W NON-IND.
SHUNT
OUTPUT DIODE
32
CIRCUIT
SYM BOL
PB2
R4,R5
C7,C8
L1
CTR2
T1
TS1
C10
R2& R3
SH
OBR1-4
10
1
9
2,3
8
7
6
4
5
Figure 6-6. Digipulse 450i Power Source (Rear
View)
ITEM
NO.
1
2
3
4
5
6
7
8
9
10
QTY
REQ.
1
1
1
1
1
1
2
1
1
1
PART
NO.
950822
680970
679384
950592
97W63
952219
951033
950122
31126
951476
951475
DESCRIPTION
SWITCH, POWER LINE
MOTOR, FAN
SHROUD, FAN
BLADE, FAN
CONNECTOR, CABLE GRIP
AUX. RECEPTACLE, 115 V, 10 A
CIRCUIT BREAKER, 10 A
REAR PANEL
RECEPTACLE, 14-PIN, STICK/TIG
RECEPTACLE, 19-PIN, DIGITAL
33
CIRCUIT
SYMBOL
LS
FM
J3
CB1,2
J2
J1
NOTES
34
REVISIONS
1. Revisions of June 2003 include changes to part numbers in the REPLACEMENT PARTS SECTION on pages
28 - 33. Part numbers updated per 8/21/02 mark-up.
35
ESAB Welding & Cutting Products, Florence, SC Welding Equipment
COMMUNICATION GUIDE - CUSTOMER SERVICES
A. CUSTOMER SERVICE QUESTIONS :
Order Entry Product Availability Pricing Delivery
Order Changes Saleable Goods Returns Shipping Information
Telephone: (800)362-7080 / Fax: (800) 634-7548
Telephone: (800)783-5360 / Fax: (800) 783-5362
Telephone: (800) 235-4012/ Fax: (888) 586-4670
B. ENGINEERING SERVICE: Telephone: (843) 664-4416 / Fax : (800) 446-5693
Welding Equipment Troubleshooting Hours: 7:30 AM to 5:00 PM EST
Warranty Returns Authorized Repair Stations
C. TECHNICAL SERVICE: Telephone: (800) ESAB-123/ Fax: (843) 664-4452
Part Numbers Technical Applications Hours: 8:00 AM to 5:00 PM EST
Performance Features Technical Specifications Equipment Recommendations
D. LITERATURE REQUESTS: Telephone: (843) 664-5562 / Fax: (843) 664-5548
E. WELDING EQUIPMENT REPAIRS: Telephone: (843) 664-4487 / Fax: (843) 664-5557
Repair Estimates Repair Status Hours: 7:30 AM to 3:30 PM EST
F. WELDING EQUIPMENT TRAINING:
Telephone: (843)664-4428 / Fax: (843) 679-5864
Training School Information and Registrations Hours: 7:30 AM to 4:00 PM EST
G. WELDING PROCESS ASSISTANCE:
Telephone: (800) ESAB-123 / Fax: (843) 664-4454 Hours: 7:30 AM to 4:00 PM EST
H. TECHNICAL ASST. CONSUMABLES:
Telephone : (800) 933-7070 Hours: 7:30 AM to 5:00 PM EST
Eastern Distribution Center
Central Distribution Center
Western Distribution Center
Hours: 7:30 AM to 4:00 PM EST
IF YOU DO NOT KNOW WHOM TO CALL
Telephone: (800) ESAB-123/ Fax: (843) 664-4452/ Web:http://www.esab.com
F-15-014-F 06/2003 Printed in U.S.A.
Hours: 7:30 AM to 5:00 PM EST
36
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