Lincoln Electric IM904 User Manual

INVERTEC

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®

S T T

®

II (CE)

IM904

July, 2006

For use with machines having Code Numbers:

Safety Depends on You

Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be
increased by proper installation
... and thoughtful operation on
your part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ­ING THIS MANUAL AND THE
SAFETY PRECAUTIONS CON­TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.

11366, 11367

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com

ISO/IEC 60974-1

OPERATOR’S MANUAL

Copyright © 2006 Lincoln Global Inc.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

i

SAFETY

i

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

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

The Above For Diesel Engines

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

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

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

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

The Above For Gasoline Engines

FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame
welding arc or when the engine is running.
Stop the engine and allow it to cool before
refueling to prevent spilled fuel from vaporiz­ing on contact with hot engine parts and
igniting. Do not spill fuel when filling tank. If
fuel is spilled, wipe it up and do not start
engine until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in
position and in good repair.Keep hands, hair, clothing and
tools away from V-belts, gears, fans and all other moving
parts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety

guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan.
Do not attempt to override the governor or
idler by pushing on the throttle control rods
while the engine is running.

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

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines

2.b. EMF fields may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.

2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure
them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.

___________________________________________________

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

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

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

Mar ‘95

ii

SAFETY

ii

ELECTRIC SHOCK can
kill.

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

gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.

In addition to the normal safety precautions, if welding
must be performed under electrically hazardous
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode,
electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.

3.f.

Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.

3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

ARC RAYS can burn.

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

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

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

FUMES AND GASES
can be dangerous.

5.a. Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.

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

5.c.

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

5.d. Shielding gases used for arc welding can displace air and

cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.

vapors

to

5.e. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.

5.f. Also see item 1.b.

AUG 06

iii

SAFETY

iii

WELDING SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

the welding sparks from starting a fire.

materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standard Z49.1) and the operating information for the
equipment being used.

6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact
can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even
been “cleaned”. For information, purchase “Recommended
Safe Practices for the
Containers and Piping That Have Held Hazardous
Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.

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

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

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate cir­cuits. This can create fire hazards or overheat lifting chains
or cables until they fail.

6.h. Also see item 1.c.

Remember that welding sparks and hot

though

they have

Preparation

for Welding and Cutting of

CYLINDER may explode
if damaged.

7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and

pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.

7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.

FOR ELECTRICALLY
powered equipment.

8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.

8.b. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.

8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.

Mar ‘95

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

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

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

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

b. Faire trés attention de bien s’isoler de la masse quand on

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

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

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

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

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

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

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

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

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

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

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

8. S’assurer que la masse est connectée le plus prés possible
de la zone de travail qu’il est pratique de le faire. Si on place
la masse sur la charpente de la construction ou d’autres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de lev­age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils se rompent.

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

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

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

PRÉCAUTIONS DE SÛRETÉ POUR

3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du ray­onnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de
l‘arc.

c. Protéger l’autre personnel travaillant à proximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

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

LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR

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

2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debranch­er à l’interrupteur à la boite de fusibles.

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

Mar. ‘93

for selecting a QUALITY product by Lincoln Electric. We want you

Thank You

to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.

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

Product _________________________________________________________________________________

Model Number ___________________________________________________________________________

Code Number or Date Code_________________________________________________________________

Serial Number____________________________________________________________________________

Date Purchased___________________________________________________________________________

vv

Where Purchased_________________________________________________________________________

Whenever you request replacement parts or information on this equipment, always supply the information you
have recorded above. The code number is especially important when identifying the correct replacement parts.

On-Line Product Registration

- Register your machine with Lincoln Electric either via fax or over the Internet.

• For faxing: Complete the form on the back of the warranty statement included in the literature packet
accompanying this machine and fax the form per the instructions printed on it.

• For On-Line Registration: Go to our

“Product Registration”. Please complete the form and submit your registration.

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:

WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.

CAUTION

This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.

vi

vi

TABLE OF CONTENTS

Page

Safety .....................................................................................................................i-iv

Installation ......................................................................................................Section A

Technical Specifications.....................................................................................A-1,A-2

Location ....................................................................................................................A-3

Stacking ....................................................................................................................A-3

Tilting .....................................................................................................................A-3

Machine Grounding and High Frequency Interference Protection............................A-3

Input Connections .....................................................................................................A-3

Supply Connections ...........................................................................................A-3

Input Cable Installation and Connection.............................................................A-4

Ground Connection ............................................................................................A-4

Input Voltage Reconnect Procedure .........................................................................A-5

Output Connections ..................................................................................................A-5

Wire Feeder Output Connections.......................................................................A-5

Operation ........................................................................................................Section B

Safety Precautions....................................................................................................B-1

General Description ..................................................................................................B-2

Recommended Equipment .......................................................................................B-2

Operating Controls....................................................................................................B-2

Design Features and Advantages.............................................................................B-2

Welding Capability ....................................................................................................B-2

Limitations.................................................................................................................B-2

Operational Features and Controls...........................................................................B-3

Welding Operation ....................................................................................................B-4

Welding Parameters and Guidelines ........................................................................B-5

Welding Procedures for (Steel) Horizontal Fillet .......................................................B-5

Welding Procedures for (Stainless Steel) Horizontal Fillet .......................................B-6

Accessories ....................................................................................................Section C

Options/Accessories .................................................................................................C-1

LN-742 or STT-10 Wire Feeder Connection Instructions .........................................C-1

Maintenance....................................................................................................Section D

Safety Precautions .................................................................................................D-1

Input Filter Capacitor Discharge Procedure ...........................................................D-1

Preventive Maintenance.........................................................................................D-2

Troubleshooting .............................................................................................Section E

How To Use Troubleshooting Guide ......................................................................E-1

Troubleshooting Guide ..................................................................................E-2 - E-6

Diagrams .........................................................................................................Section F

Wiring Diagram............................................................................................F-1 thru F-3

Dimension Print.........................................................................................................F-4

Parts List ....................................................................................................P-540 Series

A-1

INSTALLATION

TECHNICAL SPECIFICATIONS –INVERTEC STT II (CE) (For Code 11366)

INPUT- THREE PHASE ONLY

STANDARD VOLTAGE INPUT CURRENT AT RATED OUTPUT

200/220/380/415/440/3/50/60 HZ 33/30/18/17/16

RATED OUTPUT

DUTY CYCLE AMPS VOLTS AT RATED AMPS

60% Duty Cycle 225 29

100% Duty Cycle 200 28

OUTPUT

CURRENT RANGE OPEN CIRCUIT VOLTAGE AUXILIARY POWER

A-1

Peak Current

1

0 - 450 Amps 85 VDC Maximum 1152VAC @ 4 Amps

Background 0 - 125 Amps 42 VAC @ 4 Amps

RECOMMENDED INPUT WIRE AND FUSE SIZES

INPUT VOLTAGE FUSE(SUPER LAG) INPUT AMPERE TYPE 75°C TYPE 75°C

AND FREQUENCY OR BREAKER RATING ON COPPER COPPER

SIZE NAMEPLATE SUPPLY WIRE GROUND WIRE

IN CONDUIT IN CONDUIT
AWG (IEC) SIZES

200/50/60 40 33

220/50/60 40 30 10 (6 mm2) 10 (6 mm2)
380/50/60 30 18
415/50/60 30 17
440/50/60 30 16

AWG (IEC) SIZES

PHYSICAL DIMENSIONS

HEIGHT WIDTH DEPTH WEIGHT

23.2 in 13.2 in. 24.4 in. 100 lbs.

589 mm 336 mm 620 mm 46 kg

1

At low input voltages (below 208 VAC) and input voltages of 380 VAC through 415 VAC there may be a 15% reduction in Peak Current.

2

115 VAC not present on European Models.

INVERTEC STT II (CE)

A-2

INSTALLATION

TECHNICAL SPECIFICATIONS –INVERTEC STT II (CE) (For Code 11367)

INPUT- THREE PHASE ONLY

STANDARD VOLTAGE INPUT CURRENT AT RATED OUTPUT

200/208/380/400/415/3/50/60 HZ 36/34/20/19/18

RATED OUTPUT

DUTY CYCLE AMPS VOLTS AT RATED AMPS

60% Duty Cycle 225 29

100% Duty Cycle 200 28

OUTPUT

CURRENT RANGE OPEN CIRCUIT VOLTAGE AUXILIARY POWER

A-2

Peak Current 0 - 450 Amps 88 VDC Maximum 115
Background 0 - 125 Amps 42 VAC @ 4 Amps

1

VAC @ 4 Amps

RECOMMENDED INPUT WIRE AND FUSE SIZES

INPUT VOLTAGE FUSE(SUPER LAG) INPUT AMPERE TYPE 75°C TYPE 75°C

AND FREQUENCY OR BREAKER RATING ON COPPER COPPER

SIZE NAMEPLATE SUPPLY WIRE GROUND WIRE

IN CONDUIT IN CONDUIT
AWG (IEC) SIZES

200/50/60 40 36
208/50/60 40 34

380/50/60 30 20 10 (6 mm2) 10 (6 mm2)
400/50/60 30 19
415/50/60 30 18

AWG (IEC) SIZES

PHYSICAL DIMENSIONS

HEIGHT WIDTH DEPTH WEIGHT

23.2 in 13.2 in. 24.4 in. 100 lbs.

589 mm 336 mm 620 mm 46 kg

1

115 VAC not present on European Models.

INVERTEC STT II (CE)

A-3

Read and understand entire Installation Section
before starting installation.

INSTALLATION

WARNING

ELECTRIC SHOCK can kill.

• Only qualified personnel should
perform this installation.

• Turn the input power OFF at the
disconnect switch or fuse box
before installing this
equipment.

• Turn the power switch on the Invertec
STT “OFF” before connecting or discon­necting input power lines, output cables,
or control cables.

• Do not touch electrically hot
parts.

• Always connect the ground terminal to a
good electrical earth ground.

SELECT SUITABLE LOCATION

Locate the machine where there is free circulation of
clean air. Place the machine so that air can freely cir­culate into the sides and out of the rear of the
machine. Dirt and dust that can be drawn into the
machine should be kept to a minimum. Failure to
observe these precautions can result in excessive
operating temperatures and nuisance shut down of
the INVERTEC STT II (CE).

This machine carries an enclosure rating of IP21S. It
should not be placed in extremely damp or dirty loca­tions. It should not be exposed to rain or snow.

A-3

MACHINE GROUNDING AND HIGH
FREQUENCY INTERFERENCE
PROTECTION

The machine may not be suitable for use in an envi­ronment where high frequency is present. For exam­ple do not place the machine in close proximity to
“TIG” or “PLASMA” operations. To minimize high fre­quency interference:

Locate the STT II power source more than 15
feet (4.5 m) away from high frequency units
and more than 25 feet (7.6 m) separation
between ground connections or welding arcs
of high frequency units.

Provide proper electrical ground to the
machine per local and national electrical
codes.

INPUT CONNECTIONS

FAILURE TO FOLLOW THESE INSTRUCTIONS
CAN CAUSE IMMEDIATE FAILURE OF COMPO­NENTS WITHIN THE WELDER.

Turn the input power off at the disconnect switch
before attempting to connect the input power lines.

Connect the green lead of the power cord to ground
per local and national electrical codes.

SUPPLY CONNECTIONS

STACKING

The INVERTEC STT II (CE) cannot be stacked.

TILTING

Place the machine on a secure, level surface other­wise the unit may topple over.

INVERTEC STT II (CE)

Be sure the voltage, phase, and frequency of the input
supply is as specified on the rating plate. Input Power
supply line entry in provided on the case back of the
machine. See figure A.1 for location of the rating plate.

The INVERTEC STT II (CE) should be connected only
by a qualified electrician. Installation should be made
in accordance with local and national codes. Refer to
the “Technical Specifications” at the beginning of this
section for proper fuse sizes, ground wire, and input
supply power cable sizes.

Some models come from the factory with an input
power cord. If your model does not include the input
power cord install the proper size input cable and
ground cable according to “INPUT CABLE INSTALLA­TION AND CONNECTION”.

A-4

CASE BACK

RATING PLATE

INPUT CABLE
ENTRY ACCESS
& CABLE STRAIN RELIEF

INSTALLATION

A-4

FIGURE A.1 CASE BACK

INPUT CABLE INSTALLATION AND CON­NECTION

A cable strain relief is provided at the supply line entry
and is designed to accommodate cable diameters of
.310 - 1.070 in. (7.9 - 27.2 mm). On European models
the strain relief is designed to accommodate cable
diameters of .709 - 1.000 in. (18.0 - 25.4 mm). Refer
to “Technical Specifications” at the beginning of this
section for the proper input cable sizes. Refer to
Figure A.1 and perform the following steps:

1. Remove the wraparound cover of the
INVERTEC STT II (CE).

2. Feed the input cable through the input cable
entry access hole at the right rear of the
machine.

3. Route the cable through the cable hangers,
located along the lower right inside edge of
the machine, up to the power switch located
on the front panel.

5. Connect the three phase line con­ductors to the power switch termi­nals labeled U, V and W. Tighten
the connections to 3.0 Nm. (27 in.-lb.) torque.

6. Securely tighten the cable strain relief located

on the case back of the machine.

GROUND CONNECTION

1. Connect the ground terminal to earth
ground per National Electrical Code.

2. Replace the wraparound cover of the

INVERTEC STT II (CE).

4. Strip away 102 mm (4 in.) of the outer jacket.
Trim fillers and strip conductor jackets to
connect to the power switch.

INVERTEC STT II (CE)

A-5

4A

380-415
OR

OR
200-208

*
*

*

(NOT PRESENT ON ALL MODELS)

ACCESS DOOR
LOCATION

INSTALLATION

380 or 415 VAC 1. Open reconnect panel
(Codes 11366) access door on wraparound.

380,400 or 415 VAC 1. Open reconnect panel

(Codes 11367) access door on wraparound.

A-5

2. Move input voltage switch
to Voltage = 380-460V
position.

3. Move lead “A” to 380-415
Terminal.

2. Move input voltage switch
to Voltage = 380-415V
position.

FIGURE A.2 RECONNECT P ANEL

I

NPUT VOLTAGE RECONNECT

PROCEDURE

As shipped from the factory, multiple voltage
machines are internally configured for the highest
input voltage (440-460 VAC), for Code 11366 and
(380-415 VAC), for Code 11367.

1. For Connections to 440 or 460 VAC verify

the
internal configurations to the procedures shown
below and refer to Figure A.2.

2. For Connections to 200,208,220,230,380,400 or
415 VAC follow the procedure shown below and
refer to figure A.2.

WARNING

NOTE: Turn main power to the machine OFF
before performing the reconnect procedure.
Failure to do so will result in damage to the
machine. DO NOT switch the reconnect bar with
machine power ON.

------------------------------------------------------------------------

To Operate at Procedure

460 or 440 VAC 1. Open reconnect panel
(Code 11366) access door on wraparound.

2. Move input voltage switch
to Voltage = 380-460V pos­ition.

3. Move lead “A” to 440-460
Terminal.

3. Move lead “A” to 380-415
Terminal.

220 or 230 VAC 1. Open reconnect panel
(Codes 11366) access door on wraparound.

2. Move input voltage switch
to Voltage = 200 -230V
position.

3. Move lead “A” to 220-230
Terminal.

200 or 208 VAC 1. Open reconnect panel
(Codes 11366) access door on wraparound.

2. Move input voltage switch
to Voltage = 200 -230V
position.

3. Move lead “A” to 200-208
Terminal.

200 or 208 VAC 1. Open reconnect panel
(Codes 11367) access door on wraparound.

2. Move input voltage switch
to Voltage = 200 -230V
position.

3. Move lead “A” to 200-208
Terminal.

OUTPUT CONNECTIONS

WIRE FEEDER OUTPUT CONNECTIONS

Refer to the Accessories section of this manual for instructions
on connecting a wire feeder to the INVERTEC STT II (CE).

The LN-742 or STT-10 wire feeder is the recommended feeder
for use with the INVERTEC STT II (CE).

INVERTEC STT II (CE)