Miller Electric STR 350C Owner`s manual

OM-249 914B
2011−02
Processes
Stick (SMAW) Welding
TIG (GTAW) Welding
Description
Arc Welding Power Source
STR 350C/450C
CE
www.MillerWelds.com
From Miller to You
Thank you and congratulations on choosing Miller. Now you can get the
job done and get it done right. We know you don’t have time to do it any
other way.
That’s why when Niels Miller first started building arc welders in 1929,
he made sure his products offered long-lasting value and superior quality.
Like you, his customers couldn’t afford anything less. Miller products had
to be more than the best they could be. They had to be the best you could
buy.
Today, the people that build and sell Miller products continue the
tradition. They’re just as committed to providing equipment and service
that meets the high standards of quality and value established in 1929.
This Owner’s Manual is designed to help you get the most out of your
Miller products. Please take time to read the Safety precautions. They will
help you protect yourself against potential hazards on the worksite. We’ve
made installation and operation quick and easy. With Miller you can
count on years of reliable service with proper maintenance. And if for
some reason the unit needs repair, there’s a Troubleshooting section that
will help you figure out what the problem is. The parts list will then help
you to decide which exact part you may need to fix the problem.
Warranty and service information for your particular model are also
provided.
Miller Electric manufactures a full line of
welders and welding related equipment. For
information on other quality Miller products, contact your local Miller
distributor to receive the latest full line catalog or individual catalog sheets.
Working as hard as you do
− every power source from
Miller is backed by the most
hassle-free warranty in the
business.
TABLE OF CONTENTS
SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1. Symbol Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2. Arc Welding Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3. Additional Symbols For Installation, Operation, And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4. California Proposition 65 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5. Principal Safety Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6. EMF Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2 − DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1. Warning Label Definitions (For Wordless Labels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2. WEEE Label (For Products Sold Within The EU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3. Symbols And Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3 − INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1. Important Information Regarding CE Products (Sold Within The EU) . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2. Serial Number And Rating Label Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4. Duty Cycle and Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5. Volt-Ampere Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6. Selecting A Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7. Tipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8. Weld Output Terminals and Selecting Cable Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9. Remote Receptacle Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10. Typical Connections For Stick (SMAW) Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11. Typical Connections For TIG (GTAW) Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-12. Electrical Service Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-13. Connecting Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4 − OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2. Welding Process Selection For STR 450 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3. Welding Process Selection For STR 350 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4. Hot Start And Arc Force (DIG) Controls (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5. Output Control Selector (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6. Amperage Control (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-7. Stick Start Procedure − Scratch Start Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8. Scratch Start TIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9. Lift-Arc Start Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5 − MAINTENANCE AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1. Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2. Help Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6 − ELECTRICAL DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 7 − PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARRANTY
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DECLARATION OF CONFORMITY
for European Community (CE marked) products.
ITW Welding Products Italy S.r.l Via Privata Iseo 6/E, 20098 San Giuliano M.se, (MI) Italy declares
that the product(s) identified in this declaration conform to the essential requirements and provi­
sions of the stated Council Directive(s) and Standard(s).
Product/Apparatus Identification:
Product
Stock Number
STR 350 C, 380VAC, 50HZ
029016245
STR 450 C, 380VAC, 50HZ
029016240
Council Directives:

2006/95/EC Low Voltage

2004/108/EC Electromagnetic Compatibility
Standards:

IEC 60974­1 Arc Welding Equipment ­ Welding Power Sources: edition 3, 2005­07.

IEC 60974­10 Arc Welding Equipment ­ Electromagnetic Compatibility Requirements: edition 2.0, 2007­08.

EN 50445:2008 Product family standard to demonstrate compliance of equipment for resistance welding, arc
welding and allied processes with the basic restrictions related to human exposure to
electromagnetic fields
(0Hz­300Hz)
EU Signatory:
December 13th, 2010
___________________________________________________________________________________
Massimigliano Lavarini
Date of Declaration
ELECTRONIC ENGINEER R&D TECH. SUPPORT
956 142 838
SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING
som _2010−03
7
Protect yourself and others from injury — read and follow these precautions.
1-1. Symbol Usage
DANGER! − Indicates a hazardous situation which, if
not avoided, will result in death or serious injury. The
possible hazards are shown in the adjoining symbols
or explained in the text.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury. The possible
hazards are shown in the adjoining symbols or explained in the text.
NOTICE − Indicates statements not related to personal injury.
Indicates special instructions.
This group of symbols means Warning! Watch Out! ELECTRIC
SHOCK, MOVING PARTS, and HOT PARTS hazards. Consult symbols and related instructions below for necessary actions to avoid the
hazards.
1-2. Arc Welding Hazards
The symbols shown below are used throughout this manual
to call attention to and identify possible hazards. When you
see the symbol, watch out, and follow the related instructions
to avoid the hazard. The safety information given below is
only a summary of the more complete safety information
found in the Safety Standards listed in Section 1-5. Read and
follow all Safety Standards.
Only qualified persons should install, operate, maintain, and
repair this unit.
During operation, keep everybody, especially children, away.
Always verify the supply ground − check and be sure that input
power cord ground wire is properly connected to ground terminal in
disconnect box or that cord plug is connected to a properly
grounded receptacle outlet.
When making input connections, attach proper grounding conductor first − double-check connections.
Keep cords dry, free of oil and grease, and protected from hot metal
and sparks.
Frequently inspect input power cord for damage or bare wiring −
replace cord immediately if damaged − bare wiring can kill.
Turn off all equipment when not in use.
Do not use worn, damaged, undersized, or poorly spliced cables.
ELECTRIC SHOCK can kill.
Touching live electrical parts can cause fatal shocks
or severe burns. The electrode and work circuit is
electrically live whenever the output is on. The input
power circuit and machine internal circuits are also
live when power is on. In semiautomatic or automatic
wire welding, the wire, wire reel, drive roll housing,
and all metal parts touching the welding wire are
electrically live. Incorrectly installed or improperly
grounded equipment is a hazard.
Do not touch live electrical parts.
Wear dry, hole-free insulating gloves and body protection.
Insulate yourself from work and ground using dry insulating mats
or covers big enough to prevent any physical contact with the work
or ground.
Do not use AC output in damp areas, if movement is confined, or if
there is a danger of falling.
Use AC output ONLY if required for the welding process.
If AC output is required, use remote output control if present on
unit.
Additional safety precautions are required when any of the following electrically hazardous conditions are present: 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; or when there is a high risk of unavoidable or accidental contact with the workpiece or ground. For these
conditions, use the following equipment in order presented: 1) a
semiautomatic DC constant voltage (wire) welder, 2) a DC manual
(stick) welder, or 3) an AC welder with reduced open-circuit voltage. In most situations, use of a DC, constant voltage wire welder
is recommended. And, do not work alone!
Disconnect input power or stop engine before installing or
servicing this equipment. Lockout/tagout input power according to
OSHA 29 CFR 1910.147 (see Safety Standards).
Properly install and ground this equipment according to its
Owner’s Manual and national, state, and local codes.
Do not drape cables over your body.
If earth grounding of the workpiece is required, ground it directly
with a separate cable.
Do not touch electrode if you are in contact with the work, ground,
or another electrode from a different machine.
Do not touch electrode holders connected to two welding machines at the same time since double open-circuit voltage will be
present.
Use only well-maintained equipment. Repair or replace damaged
parts at once. Maintain unit according to manual.
Wear a safety harness if working above floor level.
Keep all panels and covers securely in place.
Clamp work cable with good metal-to-metal contact to workpiece
or worktable as near the weld as practical.
Insulate work clamp when not connected to workpiece to prevent
contact with any metal object.
Do not connect more than one electrode or work cable to any
single weld output terminal.
SIGNIFICANT DC VOLTAGE exists in inverter welding power sources AFTER removal of input power.
Turn Off inverter, disconnect input power, and discharge input
capacitors according to instructions in Maintenance Section
before touching any parts.
HOT PARTS can burn.
Do not touch hot parts bare handed.
Allow cooling period before working on equipment.
To handle hot parts, use proper tools and/or
wear heavy, insulated welding gloves and
clothing to prevent burns.
OM-249 914 Page 1
FUMES AND GASES can be hazardous.
Welding produces fumes and gases. Breathing
these fumes and gases can be hazardous to your
health.
Keep your head out of the fumes. Do not breathe the fumes.
If inside, ventilate the area and/or use local forced ventilation at the
arc to remove welding fumes and gases.
If ventilation is poor, wear an approved air-supplied respirator.
Read and understand the Material Safety Data Sheets (MSDSs)
and the manufacturer’s instructions for metals, consumables,
coatings, cleaners, and degreasers.
Work in a confined space only if it is well ventilated, or while
wearing an air-supplied respirator. Always have a trained watchperson nearby. Welding fumes and gases can displace air and
lower the oxygen level causing injury or death. Be sure the breathing air is safe.
Do not weld in locations near degreasing, cleaning, or spraying operations. The heat and rays of the arc can react with vapors to form
highly toxic and irritating gases.
Do not weld on coated metals, such as galvanized, lead, or
cadmium plated steel, unless the coating is removed from the weld
area, the area is well ventilated, and while wearing an air-supplied
respirator. The coatings and any metals containing these elements
can give off toxic fumes if welded.
Remove stick electrode from holder or cut off welding wire at
contact tip when not in use.
Wear oil-free protective garments such as leather gloves, heavy
shirt, cuffless trousers, high shoes, and a cap.
Remove any combustibles, such as a butane lighter or matches,
from your person before doing any welding.
After completion of work, inspect area to ensure it is free of sparks,
glowing embers, and flames.
Use only correct fuses or circuit breakers. Do not oversize or bypass them.
Follow requirements in OSHA 1910.252 (a) (2) (iv) and NFPA 51B
for hot work and have a fire watcher and extinguisher nearby.
FLYING METAL or DIRT can injure eyes.
Welding, chipping, wire brushing, and grinding
cause sparks and flying metal. As welds cool,
they can throw off slag.
Wear approved safety glasses with side
shields even under your welding helmet.
BUILDUP OF GAS can injure or kill.
Shut off shielding gas supply when not in use.
Always ventilate confined spaces or use
approved air-supplied respirator.
ARC RAYS can burn eyes and skin.
Arc rays from the welding process produce intense
visible and invisible (ultraviolet and infrared) rays
that can burn eyes and skin. Sparks fly off from the
weld.
Wear an approved welding helmet fitted with a proper shade of
filter lenses to protect your face and eyes from arc rays and
sparks when welding or watching (see ANSI Z49.1 and Z87.1
listed in Safety Standards).
Wear approved safety glasses with side shields under your
helmet.
Use protective screens or barriers to protect others from flash,
glare and sparks; warn others not to watch the arc.
Wear protective clothing made from durable, flame-resistant
material (leather, heavy cotton, or wool) and foot protection.
WELDING can cause fire or explosion.
Welding on closed containers, such as tanks,
drums, or pipes, can cause them to blow up. Sparks
can fly off from the welding arc. The flying sparks, hot
workpiece, and hot equipment can cause fires and
burns. Accidental contact of electrode to metal objects can cause
sparks, explosion, overheating, or fire. Check and be sure the area is
safe before doing any welding.
Remove all flammables within 35 ft (10.7 m) of the welding arc. If
this is not possible, tightly cover them with approved covers.
Do not weld where flying sparks can strike flammable material.
Protect yourself and others from flying sparks and hot metal.
Be alert that welding sparks and hot materials from welding can
easily go through small cracks and openings to adjacent areas.
Watch for fire, and keep a fire extinguisher nearby.
Be aware that welding on a ceiling, floor, bulkhead, or partition can
cause fire on the hidden side.
Do not weld on closed containers such as tanks, drums, or pipes,
unless they are properly prepared according to AWS F4.1 (see
Safety Standards).
Do not weld where the atmosphere may contain flammable dust,
gas, or liquid vapors (such as gasoline).
Connect work cable to the work as close to the welding area as
practical to prevent welding current from traveling long, possibly
unknown paths and causing electric shock, sparks, and fire
hazards.
Do not use welder to thaw frozen pipes.
OM-249 914 Page 2
ELECTRIC AND MAGNETIC FIELDS (EMF)
can affect Implanted Medical Devices.
Wearers of Pacemakers and other Implanted
Medical Devices should keep away.
Implanted Medical Device wearers should consult their doctor
and the device manufacturer before going near arc welding, spot
welding, gouging, plasma arc cutting, or induction heating
operations.
NOISE can damage hearing.
Noise from some processes or equipment can
damage hearing.
Wear approved ear protection if noise level is
high.
CYLINDERS can explode if damaged.
Shielding gas cylinders contain gas under high
pressure. If damaged, a cylinder can explode. Since
gas cylinders are normally part of the welding
process, be sure to treat them carefully.
Protect compressed gas cylinders from excessive heat, mechanical shocks, physical damage, slag, open flames, sparks, and arcs.
Install cylinders in an upright position by securing to a stationary
support or cylinder rack to prevent falling or tipping.
Keep cylinders away from any welding or other electrical circuits.
Never drape a welding torch over a gas cylinder.
Never allow a welding electrode to touch any cylinder.
Never weld on a pressurized cylinder − explosion will result.
Use only correct shielding gas cylinders, regulators, hoses, and fittings designed for the specific application; maintain them and
associated parts in good condition.
Turn face away from valve outlet when opening cylinder valve.
Keep protective cap in place over valve except when cylinder is in
use or connected for use.
Use the right equipment, correct procedures, and sufficient number of persons to lift and move cylinders.
Read and follow instructions on compressed gas cylinders,
associated equipment, and Compressed Gas Association (CGA)
publication P-1 listed in Safety Standards.
1-3. Additional Symbols For Installation, Operation, And Maintenance
FIRE OR EXPLOSION hazard.
Do not install or place unit on, over, or near
combustible surfaces.
Do not install unit near flammables.
Do not overload building wiring − be sure power supply system is
properly sized, rated, and protected to handle this unit.
FALLING EQUIPMENT can injure.
Use lifting eye to lift unit only, NOT running
gear, gas cylinders, or any other accessories.
Use equipment of adequate capacity to lift and
support unit.
If using lift forks to move unit, be sure forks are long enough to
extend beyond opposite side of unit.
Keep equipment (cables and cords) away from moving vehicles
when working from an aerial location.
Follow the guidelines in the Applications Manual for the Revised
NIOSH Lifting Equation (Publication No. 94−110) when manually lifting heavy parts or equipment.
MOVING PARTS can injure.
Keep away from moving parts such as fans.
Keep all doors, panels, covers, and guards
closed and securely in place.
Have only qualified persons remove doors, panels, covers, or
guards for maintenance and troubleshooting as necessary.
Reinstall doors, panels, covers, or guards when maintenance is
finished and before reconnecting input power.
READ INSTRUCTIONS.
Read and follow all labels and the Owner’s
Manual carefully before installing, operating, or
servicing unit. Read the safety information at
the beginning of the manual and in each
section.
Use only genuine replacement parts from the manufacturer.
Perform maintenance and service according to the Owner’s
Manuals, industry standards, and national, state, and local
codes.
OVERUSE can cause OVERHEATING
H.F. RADIATION can cause interference.
Allow cooling period; follow rated duty cycle.
Reduce current or reduce duty cycle before
starting to weld again.
Do not block or filter airflow to unit.
FLYING SPARKS can injure.
Wear a face shield to protect eyes and face.
Shape tungsten electrode only on grinder with
proper guards in a safe location wearing proper
face, hand, and body protection.
Sparks can cause fires — keep flammables away.
STATIC (ESD) can damage PC boards.
Put on grounded wrist strap BEFORE handling
boards or parts.
Use proper static-proof bags and boxes to
store, move, or ship PC boards.
ARC WELDING can cause interference.
MOVING PARTS can injure.
Keep away from moving parts.
Keep away from pinch points such as drive
rolls.
WELDING WIRE can injure.
Do not press gun trigger until instructed to do
so.
Do not point gun toward any part of the body,
other people, or any metal when threading
welding wire.
High-frequency (H.F.) can interfere with radio
navigation, safety services, computers, and
communications equipment.
Have only qualified persons familiar with
electronic equipment perform this installation.
The user is responsible for having a qualified electrician promptly correct any interference problem resulting from the installation.
If notified by the FCC about interference, stop using the
equipment at once.
Have the installation regularly checked and maintained.
Keep high-frequency source doors and panels tightly shut, keep
spark gaps at correct setting, and use grounding and shielding to
minimize the possibility of interference.
Electromagnetic energy can interfere with
sensitive electronic equipment such as
computers and computer-driven equipment
such as robots.
Be sure all equipment in the welding area is
electromagnetically compatible.
To reduce possible interference, keep weld cables as short as
possible, close together, and down low, such as on the floor.
Locate welding operation 100 meters from any sensitive electronic equipment.
Be sure this welding machine is installed and grounded
according to this manual.
If interference still occurs, the user must take extra measures
such as moving the welding machine, using shielded cables,
using line filters, or shielding the work area.
OM-249 914 Page 3
1-4. California Proposition 65 Warnings
Welding or cutting equipment 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 Section 25249.5 et seq.)
Battery posts, terminals and related accessories contain lead
and lead compounds, chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. Wash hands after handling.
For Gasoline Engines:
Engine exhaust contains chemicals known to the State of
California to cause cancer, birth defects, or other reproductive harm.
For Diesel Engines:
Diesel engine exhaust and some of its constituents are
known to the State of California to cause cancer, birth
defects, and other reproductive harm.
This product contains chemicals, including lead, known to
the state of California to cause cancer, birth defects, or other
reproductive harm. Wash hands after use.
1-5. Principal Safety Standards
Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,
from Global Engineering Documents (phone: 1-877-413-5184, website:
www.global.ihs.com).
Safe Practices for the Preparation of Containers and Piping for Welding
and Cutting, American Welding Society Standard AWS F4.1, from Global Engineering Documents (phone: 1-877-413-5184, website:
www.global.ihs.com).
National Electrical Code, NFPA Standard 70, from National Fire Protection Association, Quincy, MA 02269 (phone: 1-800-344-3555, website:
www.nfpa.org and www. sparky.org).
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1,
from Compressed Gas Association, 4221 Walney Road, 5th Floor,
Chantilly, VA 20151 (phone: 703-788-2700, website:www.cganet.com).
Safety in Welding, Cutting, and Allied Processes, CSA Standard
W117.2, from Canadian Standards Association, Standards Sales, 5060
Spectrum Way, Suite 100, Ontario, Canada L4W 5NS (phone:
800-463-6727, website: www.csa-international.org).
Safe Practice For Occupational And Educational Eye And Face Protection, ANSI Standard Z87.1, from American National Standards Institute,
25 West 43rd Street, New York, NY 10036 (phone: 212-642-4900, website: www.ansi.org).
Standard for Fire Prevention During Welding, Cutting, and Other Hot
Work, NFPA Standard 51B, from National Fire Protection Association,
Quincy, MA 02269 (phone: 1-800-344-3555, website: www.nfpa.org.
OSHA, Occupational Safety and Health Standards for General Industry, Title 29, Code of Federal Regulations (CFR), Part 1910, Subpart Q,
and Part 1926, Subpart J, from U.S. Government Printing Office, Superintendent of Documents, P.O. Box 371954, Pittsburgh, PA 15250-7954
(phone: 1-866-512-1800) (there are 10 OSHA Regional Offices—
phone for Region 5, Chicago, is 312-353-2220, website:
www.osha.gov).
U.S. Consumer Product Safety Commission (CPSC), 4330 East West
Highway, Bethesda, MD 20814 (phone: 301-504-7923, website:
www.cpsc.gov).
Applications Manual for the Revised NIOSH Lifting Equation, The National Institute for Occupational Safety and Health (NIOSH), 1600
Clifton Rd, Atlanta, GA 30333 (phone: 1-800-232-4636, website:
www.cdc.gov/NIOSH).
1-6. EMF Information
Electric current flowing through any conductor causes localized electric
and magnetic fields (EMF). Welding current creates an EMF field
around the welding circuit and welding equipment. EMF fields may interfere with some medical implants, e.g. pacemakers. Protective
measures for persons wearing medical implants have to be taken. For
example, access restrictions for passers−by or individual risk assessment for welders. All welders should use the following procedures in
order to minimize exposure to EMF fields from the welding circuit:
1. Keep cables close together by twisting or taping them, or using a
cable cover.
2. Do not place your body between welding cables. Arrange cables
to one side and away from the operator.
3. Do not coil or drape cables around your body.
OM-249 914 Page 4
4. Keep head and trunk as far away from the equipment in the
welding circuit as possible.
5. Connect work clamp to workpiece as close to the weld as
possible.
6. Do not work next to, sit or lean on the welding power source.
7. Do not weld whilst carrying the welding power source or wire
feeder.
About Implanted Medical Devices:
Implanted Medical Device wearers should consult their doctor and the
device manufacturer before performing or going near arc welding, spot
welding, gouging, plasma arc cutting, or induction heating operations.
If cleared by your doctor, then following the above procedures is recommended.
SECTION 2 − DEFINITIONS
2-1. Warning Label Definitions (For Wordless Labels)
Warning! Watch Out! There are
possible hazards as shown by the
symbols.
1
1.1
1.2
1.3
2
2.1
2.2
2.3
3
3.1
3.2
3.3
4
4.1
5
6
Electric shock from welding
electrode or wiring can kill.
Wear dry insulating gloves.
Do not touch electrode with
bare hand. Do not wear wet or
damaged gloves.
Protect yourself from electric
shock by insulating yourself
from work and ground.
Disconnect input plug or
power before working on
machine.
Breathing welding fumes can
be hazardous to your health.
Keep your head out of the
fumes.
Use forced ventilation or local
exhaust to remove the fumes.
Use ventilating fan to remove
fumes.
Welding sparks can cause
explosion or fire.
Keep flammables away from
welding. Do not weld near
flammables.
Welding sparks can cause
fires. Have a fire extinguisher
nearby, and have a
watchperson ready to use it.
Do not weld on drums or any
closed containers.
Arc rays can burn eyes and
injure skin.
Wear hat and safety glasses.
Use ear protection and button
shirt collar. Use welding
helmet with correct shade of
filter. Wear complete body
protection.
Become trained and read the
instructions before working on
the machine or welding.
Do not remove or paint over
(cover) the label.
OM-249 914 Page 5
Warning! Watch Out! There are
possible hazards as shown by the
symbols.
Electric shock from wiring can kill.
Disconnect input plug or power
before working on machine.
Read the Owner’s Manual before
working on this machine.
1
2
3
4
5
Consult rating label for input
power requirements, and
check power available at the
job site − they must match.
Read Owner’s Manual and
inside labels for connection
points and procedures.
Move jumper links as shown
on inside label to match
voltage at job site.
Having a loop of extra length,
connect grounding conductor
first.
Connect line input conductors
as shown on inside label −
double-check all connections,
jumper link positions, and
input voltage before applying
power.
1/96
2-2. WEEE Label (For Products Sold Within The EU)
Do not discard product (where applicable) with general waste.
Reuse or recycle Waste Electrical
and Electronic Equipment (WEEE)
by disposing at a designated collection facility.
Contact your local recycling office
or your local distributor for further
information.
OM-249 914 Page 6
2-3. Symbols And Definitions
A
Amperes
Negative Weld
Output Terminal
Positive Weld
Output Terminal
Protective Earth
(Ground)
Output
Supplementary
Protector
Off
On
Volts
Shielded Metal Arc
Welding (SMAW)
Input
Remote
V
U0
Constant Current
(CC)
X
Rated No-Load
Voltage (Average)
U1
Scratch Start TIG
Fuse
Gas Tungsten Arc
Welding (GTAW)
Arc Force (DIG)
Duty Cycle
Rated Supply
Voltage
I1
Rated Supply
Current
U2
Load voltage
Line Connection
Current Increase/
Decrease
Three Phase
Transformer
Rectifier
KVA
Lift-Arc Start
(GTAW)
Panel/Local
Hot Start
Stick Gauging
IP
S
I1max
Internal Protection
Rating
S1
Suitable For Areas
Of Increased
Shock Hazard
Rated Maximum
Supply Current
I1eff
I2
Rated Welding
Current
Maximum Effective
Supply Current
Notes
OM-249 914 Page 7
SECTION 3 − INSTALLATION
3-1. Important Information Regarding CE Products (Sold Within The EU)
!
This equipment shall not be used by the general public as the EMF limits for the general public might be exceeded during welding.
This equipment is built in accordance with EN 60974−1 and is intended to be used only in an occupational environment (where the general public
access is prohibited or regulated in such a way as to be similar to occupational use) by an expert or an instructed person.
Wire feeders and ancillary equipment (such as torches, liquid cooling systems and arc striking and stabilizing devices) as part of the welding
circuit may not be a major contributor to the EMF. See the Owner’s Manuals for all components of the welding circuit for additional EMF exposure
information.
The EMF assessment on this equipment was conducted at 0.5 meter.
At a distance of 1 meter the EMF exposure values were less than 20% of the permissible values.
3-2. Serial Number And Rating Label Location
The serial number and rating information for this product is located on the back . Use rating label to determine input power requirements and/or rated
output. For future reference, write serial number in space provided on back cover of this manual.
3-3. Specifications
Model
Rated Welding
Output
350C
350 A @
34 Volts DC,
35% Duty Cycle
450C
450 A @
38 Volts DC,
35% Duty Cycle
Notes
OM-249 914 Page 8
Ampere
Range DC
20−350 A
20−450 A
Max
OpenCircuit
Voltage DC
IP
Rating
70 V
IP23S
70 V
Amperes Input at
Rated Load Output,
50/60 Hz, Three-Phase
KVA/KW
Weight
Dimensions
(mm)
LxWxH
25.3/17.2
Net: 132 kg
(291 lb)
Ship: 142
(313 lb)
1120 x 620 x 730
32.8/24.6
Net: 164 kg
(362 lb)
Ship: 174
(384 lb)
380 V
IP23S
38 A
50 A
1120 x 620 x 730
3-4. Duty Cycle and Overheating
Duty Cycle is percentage of 10 minutes that unit can weld at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
duty cycle before welding.
500
450
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
Weld Amperes
400
350
300
250
200
150
0
10
20
30
40
50
60
70
80
90
100
% Duty Cycle
35% Duty Cycle At 450 A
3.5 Minutes Welding
60%Duty Cycle At 350 A
6 Minutes Welding
6.5 Minutes Resting
4 Minutes Resting
100% Duty Cycle At 270 A
Continuous
Welding
Overheating
A or V
0
15
Minutes
OR
Reduce Duty Cycle
OM-249 914 Page 9
3-5. Volt-Ampere Curves
The volt-ampere curves show the
normal minimum and maximum
voltage and amperage output capabilities of the unit.
STR 350C
90
80
70
DC Volts
60
50
40
30
20
10
0
0
20
40
60
80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380
DC Amperes
STR 450C
90
80
70
DC Volts
60
50
40
30
20
10
0
0 20 40 60 80 100120 140 160 180 200 220240260 280 300 320 340 360 380 400 420 440460 480
DC Amperes
OM-249 914 Page 10
3-6. Selecting A Location
1
2
Lifting Eye
Lifting Forks
Use lifting eye or lifting forks to
move unit.
Movement
If using lifting forks, extend forks
beyond opposite side of unit.
1
3
2
Location And Airflow
Line Disconnect Device
Locate unit near correct input power supply.
OR
!
Special installation may be
required where gasoline or
volatile liquids are present −
see NEC Article 511 or CEC
Section 20.
!
Do not move or operate unit
where it could tip.
3
18 in.
(460 mm)
18 in.
(460 mm)
3-7. Tipping
956142770_5−5_B
OM-249 914 Page 11
3-8. Weld Output Terminals and Selecting Cable Sizes
NOTICE − The Total Cable Length in Weld Circuit (see table below) is the combined length of both weld cables. For example, if the power source is
30 m (100 ft) from the workpiece, the total cable length in the weld circuit is 60 m (2 cables x 30 m). Use the 60 m (200 ft) column to determine cable
size.
Weld Cable Size** and Total Cable (Copper) Length in Weld Circuit
Not Exceeding***
Weld Output
Terminals
!
Turn off power before connecting to
weld output terminals.
!
Do not use worn,
damaged,
undersized, or poorly
spliced cables.
30 m (100 ft) or Less
Positive
Terminal
70 m
(250 ft)
90 m
(300 ft)
105 m
(350 ft)
120 m
(400 ft)
60 − 100%
Duty
Cycle
mm2 (AWG)
mm2 (AWG)
100
20 (4)
20 (4)
20 (4)
30 (3)
35 (2)
50 (1)
60 (1/0)
60 (1/0)
150
30 (3)
30 (3)
35 (2)
50 (1)
60 (1/0)
70 (2/0)
95 (3/0)
95 (3/0)
200
30 (3)
35 (2)
50 (1)
60 (1/0)
70 (2/0)
95 (3/0)
120 (4/0)
120 (4/0)
250
35 (2)
50 (1)
60 (1/0)
70 (2/0)
95 (3/0)
120 (4/0)
2x70
2x70
(2 ea. 2/0) (2 ea. 2/0)
300
50 (1)
60 (1/0)
70 (2/0)
95 (3/0)
120 (4/0)
2x70
2x95
2x95
(2 ea. 2/0) (2 ea. 3/0) (2 ea. 3/0)
350
60 (1/0)
70 (2/0)
95 (3/0)
120 (4/0)
2x70
2x95
2x95
2x120
(2 ea. 2/0) (2 ea. 3/0) (2 ea. 3/0) (2 ea. 4/0)
400
60 (1/0)
70 (2/0)
95 (3/0)
120 (4/0)
2x70
2x95
2x120
2x120
(2 ea. 2/0) (2 ea. 3/0) (2 ea. 4/0) (2 ea. 4/0)
500
70 (2/0)
95 (3/0)
120 (4/0)
2x70
2x95
2x120
3x95
3x95
(2 ea. 2/0) (2 ea. 3/0) (2 ea. 4/0) (3 ea. 3/0) (3 ea. 3/0)
600
95 (3/0)
120 (4/0)
2x70
2x95
2x120
3x95
3x120
3x120
(2 ea. 2/0) (2 ea. 3/0) (2 ea. 4/0) (3 ea. 3/0) (3 ea. 4/0) (3 ea. 4/0)
956142770_5−5_B
* This
60 m
(200 ft)
10 − 60%
Duty
Cycle
Welding
Amperes
Negative
Terminal
45 m
(150 ft)
10 − 100% Duty Cycle
mm2 (AWG)
chart is a general guideline and may not suit all applications. If cable overheats, use next size larger cable.
**Weld cable size is based on either a 4 volts or less drop or a current density of at least 300 circular mils per ampere.
***For distances longer than those shown in this guide, call a factory applications representative.
OM-249 914 Page 12
Milan Ref. S-0007-G 2009−08
3-9. Remote Receptacle Information
REMOTE
Socket*
Socket Information
A
Contact closure to B completes 24 volts AC contactor control circuit.
B
Contact closure to A completes 24 volts AC contactor control circuit.
C
Output to remote control; +10 volts DC.
D
Remote control circuit common.
E
0 to +10 volts DC input command signal from remote control.
A
B
C
D
E
REMOTE
CONTROL
**
* The remaining sockets are not used.
**When connecting HF5000 unit, set amperage at 400 amps according to instructions in HF5000 owner’s manual.
Notes
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.
OM-249 914 Page 13
3-10. Typical Connections For Stick (SMAW) Welding
956142770_1-5_B / Ref. 803 310
3-11. Typical Connections For TIG (GTAW) Welding
Remote output is always On in
TIG mode. See Section 4-8 for
scratch start TIG information.
Hot Start function (for Stick welding) is disabled in TIG mode.
This unit automatically uses the
remote control if connected to the
remote receptacle (see Section
3-9).
1
2
1
2
OM-249 914 Page 14
Remote Hand Control
Remote Foot Control
3-12. Electrical Service Guide
Failure to follow these fuse and circuit breaker recommendations could create an electric shock or fire hazard. These
recommendations are for a dedicated branch circuit that applies to the rated output and duty cycle of the welding power source.
3-Phase
Model
Input Voltage (V)
Input Amperes (A) At Rated Output
Max Recommended Standard Fuse Rating In Amperes
Fuses3
Min Input Conductor Size In
mm2
(AWG)
4
Max Recommended Input Conductor Length In Meters (Feet)
Min Grounding Conductor Size In mm2 (AWG) 4
STR 450 C
380
380
38
50
45
60
60
70
1
Time-Delay Fuses 2
Normal Operating
STR 350 C
6 (10)
10 (8)
61 (199)
64 (210)
6 (10)
10 (8)
** Power cord supplied with the unit is sized for 230V operation. Larger power cord may be required for cable lengths greater than 3 meters.
Consult national and local regulations.
Reference: 2008 National Electrical Code (NEC) (including article 630)
1 If a circuit breaker is used in place of a fuse, choose a circuit breaker with time-current curves comparable to the recommended fuse.
2 “Time-Delay” fuses are UL class “RK5” . See UL 248.
3 “Normal Operating” (general purpose - no intentional delay) fuses are UL class “K5” (up to and including 60 amps), and UL class “H” ( 65 amps and
above).
4 Conductor data in this section specifies conductor size (excluding flexible cord or cable) between the panelboard and the equipment per NEC Table
310.16. If a flexible cord or cable is used, minimum conductor size may increase. See NEC Table 400.5(A) for flexible cord and cable requirements.
Notes
OM-249 914 Page 15
3-13. Connecting Input Power
2
!
Installation must meet all National and Local Codes −
have only qualified persons
make this installation.
!
Disconnect and lockout/tagout input power before connecting input conductors
from unit.
!
Always connect green or
green/yellow conductor to
supply grounding terminal
first, and never to a line terminal.
!
Make input power connections to the welding power
source first.
!
Special installation may be
required where gasoline or
volatile liquids are present −
see NEC Article 511 or CEC
Section 20.
GND/PE
1
4
3
L1 (U)
L2 (V)
GND/PE
Connect First
L3 (W)
See rating label on unit and check
input voltage available at site.
1
2
Disconnect Device (switch
shown in OFF position)
Disconnect Device (Supply)
Grounding Terminal
Connect green or green/yellow
grounding conductor to disconnect
device grounding terminal first.
3
Disconnect Device Line
Terminals
Connect input conductors L1 (U),
L2 (V) And L3 (W) to disconnect
device line terminals.
4
Overcurrent Protection
Select type and size of overcurrent
protection using Section 3-12
(fused disconnect switch shown).
Close and secure door on line disconnect device. Remove lockout/
tagout device, and place switch in
the On position.
OM-249 914 Page 16
SECTION 4 − OPERATION
4-1. Controls
1
2
3
4
5
6
3
4
5
6
7
8
9
10
Negative (−) Weld Terminal
Power On-Off Switch
Welding Process Selection
Control (Contactor) (See
Section 4-2 or 4-3)
Welding Current Indicator
Power On Pilot Light
Weld Output Indicator Light
7
High Temperature
Indicator
8
Arc Force (DIG) Control
(See Section 4-4)
9
Hot Start Control
(See Section 4-4)
10 Weld Current Control
11 Output Control Selector (See
Section 4-5)
12 Positive (+) Weld Terminal
13 Remote Control Receptacle
(See Section 3-9)
11
2
12
1
13
OM-249 914 Page 17
4-2.
Welding Process Selection For STR 450 C
1
2
3
4
Welding Process Selection
Control (Contactor)
Use control to select weld process.
The weld process selected determines weld output on/off control. See
Table below.
5
!
Weld output terminals are energized when welding precess
selection control is in the TIG
Lift-Arc or Stick positions.
2
TIG Lift-Arc − This is a DCEN
(direct current electrode
negative) process in which the
electrode must come in contact
with work piece to initiate an
arc(see Section 4-9). Make
connections according to
Section 3-11.
TIG - (Remote) − This is a
GTAW process. Make
connections according to
Section 3-11.
CC - (Remote) − This is a
DCEP (direct current electrode
positive) process. Make
connections according to
Section 3-10.
Stick - (SMAW) − This is a
DCEP (direct current electrode
positive) process. Make
connections according to
Section 3-10.
Stick Gouging
6
1
3
4
5
6
This is an air Stick welding holder
which uses gouging electrodes for air
carbon arc metal removal process.
When Stick is selected, use arc
force (DIG) control to increase
SMAW short-circuit amperage at
low arc voltage. This allows the
operator to use a very short arc
length without sticking the electrode.
Output ON/Off Control Status
Switch Setting
TIG Lift-Arc
Output On/Off Control
Electrode always energized (Hot).
TIG-Remote
Through Remote 14 receptacle. Remote on/off switch required.
CC-Remote
Through Remote 14 receptacle. Remote on/off switch required.
Stick
OM-249 914 Page 18
Electrode always energized (Hot).
4-3.
Welding Process Selection For STR 350 C
1
2
3
4
5
Welding Process Selection
Control (Contactor)
Use control to select weld process.
The weld process selected determines weld output on/off control. See
Table below.
!
Weld output terminals are energized when welding precess
selector control is in the TIG
Lift-Arc or Stick positions.
2
TIG Lift-Arc − This is a DCEN
(direct current electrode
negative) process in which the
electrode must come in contact
with work piece to initiate an
arc(see Section 4-9). Make
connections according to
Section 3-11.
TIG - (Remote) − This a GTAW
process. Make connections
according to Section 3-11.
CC - (Remote) − This is a
DCEP (direct current electrode
positive) process. Make
connections according to
Section 3-10.
Stick - (SMAW) − This is a
DCEP (direct current electrode
positive) process. Make
connections according to
Section 3-10.
1
3
4
5
When Stick is selected, use arc
force (DIG) control to increase
SMAW short-circuit amperage at
low arc voltage. This allows the
operator to use a very short arc
length without sticking the electrode.
Output ON/Off Control Status
Switch Setting
Output On/Off Control
TIG Lift-Arc
Electrode always energized (Hot).
TIG-Remote
Through Remote 14 receptacle. Remote on/off switch required.
CC-Remote
Through Remote 14 receptacle. Remote on/off switch required.
Stick
Electrode always energized (Hot).
OM-249 914 Page 19
4-4. Hot Start And Arc Force (DIG) Controls (All Models)
1
2
!
Weld output terminals are
energized when welding process selector control is in the
Stick position.
1
Arc Force (DIG) Control
Control increases SMAW short-circuit amperage at low arc voltage.
This allows the operator to use a
very short arc length without sticking the electrode.
Set control at 0 for normal welding
amperage. Turn control clockwise
to increase short-circuit amperage.
2
Hot Start Control
Used in Stick and CC mode. Allows
increasing the output amperage at
the start of a weld.
Set control at 0 for normal welding
output amperage. Turn control
clockwise to increase starting
amperage.
4-5. Output Control Selector (All Models)
2
1
!
Weld output terminals are
energized when welding process selector control is in the
TIG Lift-Arc or Stick positions.
1
Output Control Selector
Use switch to select way of controlling unit output.
2
Panel Selection LED
LED illuminates when panel control
is selected.
3
Remote Selection LED
LED illuminates when remote output is selected. Connect remote
control to Remote 14 receptacle
(see Section 3-9).
3
OM-249 914 Page 20
4-6. Amperage Control (All Models)
!
Weld output terminals are
energized when welding process selector control is in the
TIG Lift-Arc or Stick positions.
1
Amperage Control
Rotate control clockwise to increase amperage.
1
4-7.
Stick Start Procedure − Scratch Start Technique
With Stick selected, start arc as
follows:
1
2
3
Electrode
Workpiece
Arc
Drag electrode across workpiece like
striking a match; lift electrode slightly
after touching work. If arc goes out
electrode was lifted to high. If
electrode sticks to workpiece, use a
quick twist to free it.
1
2
3
OM-249 914 Page 21
4-8. Scratch Start TIG
This starting method is not acceptable for critical applications since
small tungsten particles may become embedded in the workpiece
and contaminate the weld.
Turn gas on.
Quickly drag electrode across
workpiece like striking a match; lift
electrode slightly after touching
work.
If arc goes out electrode was lifted to
high. If electrode sticks to
workpiece, use a quick twist to free
it.
Ref. WM Marketing
4-9. Lift-Arc Start Procedures
Lift-Arc Start
When Lift-Arc button light is On,
start arc as follows:
1
TIG Electrode
2
Workpiece
Touch tungsten electrode to workpiece at weld start point, enable output and shielding gas with torch trigger, foot control, or hand control.
Hold electrode to workpiece for
1-2 seconds, and slowly lift electrode. Arc is formed when electrode
is lifted.
Lift-Arc Start Method
1
“Touch”
1−2
Seconds
2
Normal open-circuit voltage is not
present before tungsten electrode
touches workpiece; only a low
sensing voltage is present between
electrode and workpiece. The
solid-state output contactor does
not energize until after electrode is
touching workpiece. This allows
electrode to touch workpiece without overheating, sticking, or getting
contaminated.
Application:
Lift-Arc is used for the DCEN or AC
GTAW process when HF Start
method is not permitted, or to replace the scratch method.
Do NOT Strike Like A Match!
OM-249 914 Page 22
SECTION 5 − MAINTENANCE AND TROUBLESHOOTING
5-1. Routine Maintenance
!
= Check
= Change
Disconnect power
before maintaining.
= Clean
= Replace
* To be done by Factory Authorized Service Agent
Every
3
Months
Damaged Or
Unreadable Labels
Every
6
Months
Cracked Weld cables
Weld Connections
OR
Inside Unit
5-2. Help Displays
1
AL1
2
AL2
3
AL3
1
2
3
AL1 Display
AL2 Display
AL3 Display
Power
On pilot light flashes
when any of these help displays
are shown.
Displays indicate a malfunction in the
primary power circuit (loss of input
power phase). If any of these displays
are shown, check input power connections. If trouble continues, contact
a Factory Authorized Service Agent.
5-3. Troubleshooting
Trouble
No weld output; fan does not run.
Remedy
Be sure Power switch is On (see Section 4-1).
Be sure line disconnect switch is in On position.
Check and replace line fuses if open. Reset breakers if necessary.
Fan does not run; weld output okay.
Be sure nothing is blocking movement of fan. If fan does not run freely, replace fan motor.
Erratic or improper weld output.
Clean and tighten all weld cable connections.
Check for proper size and type of cable (see Section 3-8).
Check for proper input and output connections (see Sections 3-8 and/or 3-13).
Replace electrode.
OM-249 914 Page 23
Trouble
Erratic arc with excessive spatter.
Remedy
Use dry, properly stored electrodes.
Shorten arc length.
Reduce amperage setting.
Electrode freezing to work.
Increase amperage setting.
Increase arc length.
Use dry, properly stored electrodes.
Low weld output with no control.
Check position of Amperage Control (see Section 4-1).
Limited output and low open-circuit
voltage.
Check incoming power for correct voltage. Replace line fuse if open (see Section 3-13).
Check for proper input and output connections (see Sections 3-8 and/or 3-13).
Notes
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.
OM-249 914 Page 24
Notes
OM-249 914 Page 25
SECTION 6 − ELECTRICAL DIAGRAMS
Figure 6-1. Circuit Diagram For STR 350 C
OM-249 914 Page 26
956142771-B
OM-249 914 Page 27
Figure 6-2. Circuit Diagram For STR 450 C
OM-249 914 Page 28
956142772-B
OM-249 914 Page 29
SECTION 7 − PARTS LIST
Hardware is common and not available unless listed.
7
5
6
18
3
5
4
17
8
2
9
1
10
11
16
5
12
6
5
13
14
7
10
12
12
11
15
12
4
13
12
956142770_2-5_B
Figure 7-1. Case And Running Gear
Item
No.
Dia.
Mkgs.
Part
No.
Description
Quantity
Figure 7-1. Case And Running Gear
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
1
2
3
4
5
6
7
8
9
10
11
11
12
13
14
15
16
17
18
. . . . . . . . . . . . . +156122085
. . . . . . . . . . . . . +156121042
. . . . . . . . . . . . . . 156011019
. . . . . . . . . . . . . . 156005129
. . . . . . . . . . . . . . 556009031
. . . . . . . . . . . . . . 056054057
. . . . . . . . . . . . . . 156023156
. . . . . . . . . . . . . . 156009127
. . . . . . . . . . . . . . 056020071
. . . . . . . . . . . . . . 156002047
. . . . . . . . . . . . . . 156018114
. . . . . . . . . . . . . . 156018125
. . . . . . . . . . . . . . 156009128
. . . . . . . . . . . . . . 156012132
. . . . . . . . . . . . . +156122086
. . . . . . . . . . . . . . 156110001
. . . . . . . . . . . . . . 156012133
. . . . . . . . . . . . . . 000176254
. . . . . . . . . . . . . . 000207291
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
Panel, RH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upper panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Eyebolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washer, Hooking (Support For Handle) . . . . . . . . . . . . . . . . . . . . . . . .
Washer, Brass .26 x 35 x 3 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel d.300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cup, Retaining Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washer, Round hooking (For Handle) . . . . . . . . . . . . . . . . . . . . . . . . .
Knob (for hose) 25 mm dia. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nut, Locking M10 STR 350C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nut, Locking hex M8STR450C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washer, flat 10x30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle, Fixing Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Panel, LH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Wheels 25x605 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Label, General Precautionary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Label, Warning Electric Shock Input 1 And 3Phase CE . . . . . . . . . .
+
When ordering a component originally displaying a precautionary label, the label should also be ordered.
1
1
2
2
4
2
2
2
2
2
2
2
6
2
1
2
1
1
1
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
OM-249 914 Page 30
Hardware is common and
not available unless listed.
25
31
7
28
30
8
27
2
26
29
3
1
4
5
24
9
23
6
22
21
20
10
11-Fig 7-3
19
12
13
18
14
12
15
16
17
956142770_3-5_D
Figure 7-2. Main Assembly
Quantity
Model
Item
No.
Dia.
Mkgs.
Part
No.
Description
350C
450C
Figure 7-2. Main Assembly
...
...
...
...
...
...
...
...
...
...
...
1
2
3
4
5
5
6
6
7
8
8
. . . . . . . . . . . 656089037
. . . . . . . . . . . . . . Deleted
. . . . . . . . . . . . . . Deleted
. . . . . . . . . . . 156005130
. . . . . . . . . . . 057098020
. . . . . . . . . . . 057098019
. . . . . . . . . . . 058021150
. . . . . . . . . . . 058021149
. . . . . . . . . . . 056159026
. . . . . . . . . . . 056050159
. . . . . . . . . . . 056050158
. . Clamp, cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
....................................................................
....................................................................
. . Support, voltage change board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . Choke, 80x62x240 Al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . Choke, 80x70x180 Al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . Transformer 380V, STR 450 C, 60x110x180 Al . . . . . . . . . . . . . . . . . . . . . . 1
. . Transformer 380V, STR 350 C, 60x90x180 Al . . . . . . . . . . . . . . . . 1
. . Thermostat 100c 10 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . Rectifier, PTT−550−DAVA + TH100 + PTS10 . . . . . . . . . . . . . . . . . . . . . . . . 1
. . Rectifier, PTT−350−DAVA + T100 + PTS10 . . . . . . . . . . . . . . . . . . 1
OM-249 914 Page 31
Quantity
Model
Item
No.
Dia.
Mkgs.
Part
No.
Description
350C
450C
Figure 7-2. Main Assembly (continued)
. . . 9 . . . . . . . . . . . 057028116 . . Probe Kit, 600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 10 . . . . . . . . . . . 056020037 . . Knob, Pointer D.48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 11 . . . . . . . . . . . 058040018 . . Control Panel, STR 450 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 11 . . . . . . . . . . . 058040017 . . Control Panel, STR 350 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 12 . . . . . . . . . . . 056076152 . . Socket, Dinse 50 Sq Mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . 2
. . . 13 . . . . . . . . . . . 356029223 . . Nameplate, Lower, STR 450/450 C . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 14 . . . . . . . . . . . 058066076 . . Connector kit, 14 Pin Female . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 15 . . . . . . . . . . . 058075014 . . Front Panel + PCB Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 16 . . . . . . . . . . . 056059281 . . Resistor, 500 Ohm D16 L90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 17 . . . . . . . . . . . 156006069 . . Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 18 . . . M1 . . . 057035009 . . Fan, 230 V, 110W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 19 . . . . . . . . . . . 116117077 . . Conveyor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 20 . . . . . . . . . . . 156118073 . . Panel, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 21 . . . . . . . . . . . 057014212 . . Cable, Primary Input 4 X10 Mt.4,5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 21 . . . . . . . . . . . 057014054 . . Cable, Primary Input 4 X 6 Mt.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 22 . . . . . . . . . . . 356029234 . . Nameplate, Rear, 48V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 23 . . . . . . . . . . . 056076212 . . Outlet, 32 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 24 . . . . . . . . . . . 656081027 . . Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . 2
. . . 25 . . . . . . . . . . . 000175282 . . Cover, receptacle duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 26 . . . . . . . . . . . 000604176 . . Receptacle, 115V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 30 . CB1 . . . . 056067263 . . Breaker, Circuit 32 A, w/rubber boot . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 28 . CB2 . . . . 056067264 . . Breaker, Circuit 10 A, w/rubber boot . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 29 . . . . . . . . . . . 656089026 . . Clamp, Cable, D30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 30 . . . . S1 . . . 056067210 . . Switch, 32 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 31 . . . . . . . . . . . 356029225 . . Nameplate, Rear, 115V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
OM-249 914 Page 32
Hardware is common and not available unless listed.
6
7
5
4
1
2
3
956142770_4-5_D
Figure 7-3. Front Panel
Quantity
Model
Item
No.
Dia.
Mkgs.
Part
No.
Description
350C
450C
Figure 7-3. Front Panel
...
...
...
...
...
...
...
...
...
...
1
2
3
4
4
5
6
6
7
7
...........
...........
...........
...........
...........
...........
...........
...........
...........
...........
000193919
000193920
000171007
356029222
356029227
116145013
057084151
057084153
057084152
057084154
..
..
..
..
..
..
..
..
..
..
Knob, pointer 1.250 dia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . .
Knob, pointer .840 dia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . .
Knob, pointer 1.660 dia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . .
Nameplate, upper, front STR 450 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nameplate, upper, front STR 350 C . . . . . . . . . . . . . . . . . . . . . . . . . 1
Plate, PCB support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . .
PC3, digital meter board, 4 pos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PC3, digital meter board, 5 pos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PC1, main board, 4 pos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PC1, main board, 5 pos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2
1
1
1
1
1
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
OM-249 914 Page 33
Notes
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.
Effective January 1, 2011
(Equipment with a serial number preface of MB or newer)
This limited warranty supersedes all previous Miller warranties and is exclusive with no other
guarantees or warranties expressed or implied.
LIMITED WARRANTY − Subject to the terms and conditions
below, ITW Welding Products Italy warrants to its original retail
purchaser that new Miller equipment sold after the effective date
of this limited warranty is free of defects in material and
workmanship at the time it is shipped by Miller. THIS
WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS.
Within the warranty periods listed below, Miller will repair or
replace any warranted parts or components that fail due to such
defects in material or workmanship. Miller must be notified in
writing within thirty (30) days of such defect or failure, at which
time Miller will provide instructions on the warranty claim
procedures to be followed.
Miller shall honor warranty claims on warranted equipment listed
below in the event of such a failure within the warranty time
periods. All warranty time periods start on the date the
equipment was delivered to the original retail purchaser or one
year after the equipment is shipped to a European distributor or
eighteen months after the equipment is shipped to an
International distributor.
1.
5 Years Parts — 3 Years Labor
*
2.
3 Years — Parts and Labor
*
*
*
*
*
*
3.
Auto-Darkening Helmet Lenses (No Labor)
Migmatic 171
1 Year — Parts and Labor Unless Specified
*
*
*
*
*
*
*
*
*
*
*
*
5.
Engine Driven Welding Generators
(NOTE: Engines are warranted separately by the
engine manufacturer.)
HF Units
Inverter Power Sources (Unless Otherwise Stated)
Process Controllers
Semi-Automatic and Automatic Wire Feeders
Transformer/Rectifier Power Sources
2 Years — Parts
*
*
4.
Original main power rectifiers only to include SCRs,
diodes, and discrete rectifier modules
Automatic Motion Devices
Field Options
(NOTE: Field options are covered under True Blue
for the remaining warranty period of the product they
are installed in, or for a minimum of one year —
whichever is greater.)
Induction Heating Power Sources, Coolers, and
Electronic Controls/Recorders
Motor Driven Guns (w/exception of Spoolmate
Spoolguns)
Positioners and Controllers
Powered Air Purifying Respirator (PAPR) Blower
Unit (No Labor)
Racks
Running Gear and Trailers
Subarc Wire Drive Assemblies
Water Coolant Systems (Hydramate 1 and 2)
Water
Coolant
Systems
(USA
Models,
Non-Integrated)
Work Stations/Weld Tables (No Labor)
6 Months — Parts
*
Batteries
6.
90 Days — Parts
*
*
*
*
*
*
*
Accessory (Kits)
Canvas Covers
Induction Heating Coils and Blankets
MIG Guns
Remote Controls
Replacement Parts (No Labor)
Spoolmate Spoolguns
Miller’s True Blue Limited Warranty shall not apply to:
1.
Consumable components; such as contact tips,
cutting nozzles, contactors, brushes, switches, slip
rings, relays or parts that fail due to normal wear.
2.
Items furnished by Miller, but manufactured by others, such
as engines or trade accessories. These items are covered
by the manufacturer’s warranty, if any.
3.
Equipment that has been modified by any party other than
Miller, or equipment that has been improperly installed,
improperly operated or misused based upon industry
standards, or equipment which has not had reasonable and
necessary maintenance, or equipment which has been
used for operation outside of the specifications for the
equipment.
MILLER PRODUCTS ARE INTENDED FOR PURCHASE AND
USE BY COMMERCIAL/INDUSTRIAL USERS AND PERSONS
TRAINED AND EXPERIENCED IN THE USE AND
MAINTENANCE OF WELDING EQUIPMENT.
In the event of a warranty claim covered by this warranty, the
exclusive remedies shall be, at Miller’s option: (1) repair; or (2)
replacement; or, where authorized in writing by Miller in
appropriate cases, (3) the reasonable cost of repair or
replacement at an authorized Miller service station; or (4)
payment of or credit for the purchase price (less reasonable
depreciation based upon actual use) upon return of the goods at
customer’s risk and expense. Miller’s option of repair or
replacement will be F.O.B., Factory at ITW Welding Products
Group Europe or F.O.B. at a Miller authorized service facility as
determined by Miller. Therefore no compensation or
reimbursement for transportation costs of any kind will be
allowed.
TO THE EXTENT PERMITTED BY LAW, THE REMEDIES
PROVIDED HEREIN ARE THE SOLE AND EXCLUSIVE
REMEDIES. IN NO EVENT SHALL MILLER BE LIABLE FOR
DIRECT,
INDIRECT,
SPECIAL,
INCIDENTAL
OR
CONSEQUENTIAL DAMAGES (INCLUDING LOSS OF
PROFIT), WHETHER BASED ON CONTRACT, TORT OR ANY
OTHER LEGAL THEORY.
ANY EXPRESS WARRANTY NOT PROVIDED HEREIN AND
ANY
IMPLIED
WARRANTY,
GUARANTY
OR
REPRESENTATION AS TO PERFORMANCE, AND ANY
REMEDY FOR BREACH OF CONTRACT TORT OR ANY
OTHER LEGAL THEORY WHICH, BUT FOR THIS
PROVISION, MIGHT ARISE BY IMPLICATION, OPERATION
OF LAW, CUSTOM OF TRADE OR COURSE OF DEALING,
INCLUDING
ANY
IMPLIED
WARRANTY
OF
MERCHANTABILITY OR FITNESS FOR PARTICULAR
PURPOSE, WITH RESPECT TO ANY AND ALL EQUIPMENT
FURNISHED BY MILLER IS EXCLUDED AND DISCLAIMED
BY MILLER.
milan_warr 2011−01
Owner’s Record
Please complete and retain with your personal records.
Model Name
Serial/Style Number
Purchase Date
(Date which equipment was delivered to original customer.)
Distributor
Address
Country
Zip/Postal Code
For Service
Contact a DISTRIBUTOR or SERVICE AGENCY near you.
Always provide Model Name and Serial/Style Number.
Contact your Distributor for:
Welding Supplies and Consumables
Options and Accessories
Service and Repair
Replacement Parts
Owner’s Manuals
ITW Welding Products Italy S.r.l.
Contact the Delivering Carrier to:
File a claim for loss or damage during
shipment.
For assistance in filing or settling claims, contact
your distributor and/or equipment manufacturer’s
Transportation Department.
ORIGINAL INSTRUCTIONS − PRINTED IN USA
 2011 Miller Electric Mfg. Co. 2011−01
Via Privata Iseo, 6/E
20098 San Giuliano
Milanese, Italy
Phone: 39 (0) 2982901
Fax: 39 (0) 298290-203
email: miller@itw−welding.it