Lincoln Electric INVERTEC V276 User manual

Operator’s Manual
INVERTEC ®V276
Register your machine:
www.lincolnelectric.com/register
Authorized Service and Distributor Locator:
www.lincolnelectric.com/locator
IM10586 | Issue Date Feb-21
© Lincoln Global, Inc. All Rights Reserved.
For use with machines having Code Numbers:
13079, 13080
Save for future reference
Date Purchased
Code: (ex: 10859)
Serial: (ex: U1060512345)

THANK YOU FOR SELECTING
A QUALITY PRODUCT BY
LINCOLN ELECTRIC.
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.
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.
This statement appears where the information must be followed
exactly to avoid serious personal injury or loss of life.
This statement appears where the information must be followed
to avoid minor personal injury or damage to this equipment.
KEEP YOUR HEAD OUT OF THE FUMES.
DON’T get too close to the arc.
Use corrective lenses if necessary
to stay a reasonable distance
away from the arc.
READ and obey the Safety Data
Sheet (SDS) and the warning label
that appears on all containers of
welding materials.
USE ENOUGH VENTILATION or
exhaust at the arc, or both, to
keep the fumes and gases from
your breathing zone and the general area.
IN A LARGE ROOM OR OUTDOORS, natural ventilation may be
adequate if you keep your head out of the fumes (See below).
USE NATURAL DRAFTS or fans to keep the fumes away
from your face.
If you develop unusual symptoms, see your supervisor.
Perhaps the welding atmosphere and ventilation system
should be checked.
WEAR CORRECT EYE, EAR &
BODY PROTECTION
PROTECT your eyes and face with welding helmet
properly fitted and with proper grade of filter plate
(See ANSI Z49.1).
PROTECT your body from welding spatter and arc
flash with protective clothing including woolen
clothing, flame-proof apron and gloves, leather
leggings, and high boots.
PROTECT others from splatter, flash, and glare
with protective screens or barriers.
IN SOME AREAS, protection from noise may be appropriate.
BE SURE protective equipment is in good condition.
Also, wear safety glasses in work area
AT ALL TIMES.
SPECIAL SITUATIONS
DO NOT WELD OR CUT containers or materials which previously
had been in contact with hazardous substances unless they are
properly cleaned. This is extremely dangerous.
DO NOT WELD OR CUT painted or plated parts unless special
precautions with ventilation have been taken. They can release
highly toxic fumes or gases.
Additional precautionary measures
PROTECT compressed gas cylinders from excessive heat,
mechanical shocks, and arcs; fasten cylinders so they cannot fall.
BE SURE cylinders are never grounded or part of an
electrical circuit.
REMOVE all potential fire hazards from welding area.
ALWAYS HAVE FIRE FIGHTING EQUIPMENT READY FOR
IMMEDIATE USE AND KNOW HOW TO USE IT.
WARNING
CAUTION
Safety 01 of 04 - 5/16/2018

SECTION A:
WARNINGS
CALIFORNIA PROPOSITION 65 WARNINGS
WARNING: Breathing diesel engine exhaust
exposes you to chemicals known to the State
of California to cause cancer and birth defects,
or other reproductive harm.
• Always start and operate the engine in a
well-ventilated area.
• If in an exposed area, vent the exhaust to the outside.
• Do not modify or tamper with the exhaust system.
• Do not idle the engine except as necessary.
For more information go to
www.P65 warnings.ca.gov/diesel
WARNING: This product, when used for welding or
cutting, produces fumes or gases which contain
chemicals known to the State of California to cause
birth defects and, in some cases, cancer. (California
Health & Safety Code § 25249.5 et seq.)
WARNING: Cancer and Reproductive Harm
www.P65warnings.ca.gov
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. A Free copy of “Arc Welding Safety” booklet E205
is available from the Lincoln Electric Company, 22801
St. Clair Avenue, Cleveland, Ohio 44117-1199.
BE SURE THAT ALL INSTALLATION, OPERATION,
MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
FOR ENGINE POWERED
EQUIPMENT.
1.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 ame 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 lling
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.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.
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 owing through any conductor
causes localized Electric and Magnetic Fields (EMF).
Welding current creates EMF elds around welding cables
and welding machines
2.b. EMF elds may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.
2.c. Exposure to EMF elds 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 elds from the welding circuit:
2.d.1. Route the electrode and work cables together - Secure
them with tape when possible.
2.d.2. Never coil the electrode lead around your body.
2.d.3. Do not place your body between the electrode and work
cables. If the electrode cable is on your right side, the
work cable should also be on your right side.
2.d.4. Connect the work cable to the workpiece as close as pos-
sible to the area being welded.
2.d.5. Do not work next to welding power source.
SAFETY
Safety 02 of 04 - 5/16/2018

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
hardfacing (see instructions on container or SDS)
or on lead or cadmium plated steel and other
metals or coatings which produce highly toxic
fumes, keep exposure as low as possible and
within applicable OSHA PEL and ACGIH TLV limits
using local exhaust or mechanical ventilation
unless exposure assessments indicate otherwise.
In confined spaces or in some circumstances,
outdoors, a respirator may also 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 vapors
coming from degreasing, cleaning or spraying operations. The
heat and rays of the arc can react with solvent vapors to form
phosgene, a highly toxic gas, and other irritating products.
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.
5.e. Read and understand the manufacturer’s instructions for this
equipment and the consumables to be used, including the
Safety Data Sheet (SDS) and follow your employer’s safety
practices. SDS forms are available from your welding
distributor or from the manufacturer.
5.f. Also see item 1.b.
SAFETY
Safety 03 of 04 - 5/16/2018

WELDING AND CUTTING
SPARKS CAN CAUSE
FIRE OR EXPLOSION.
6.a. Remove fire hazards from the welding area. If
this is not possible, cover them to prevent the welding sparks
from starting a fire. Remember that welding sparks and hot
materials from welding can easily go through small cracks and
openings to adjacent areas. Avoid welding near hydraulic lines.
Have a fire extinguisher readily available.
6.b. Where compressed gases are to be used at the job site, special
precautions should be used to prevent hazardous situations.
Refer to “Safety in Welding and Cutting” (ANSI Standard Z49.1)
and the operating information for the equipment being used.
6.c. When not welding, make certain no part of the electrode circuit is
touching the work or ground. Accidental contact can cause
overheating and create a fire hazard.
6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances inside.
They can cause an explosion even though they have been
“cleaned”. For information, purchase “Recommended Safe
Practices for the Preparation for Welding and Cutting of
Containers and Piping That Have Held Hazardous Substances”,
AWS F4.1 from the American Welding Society
(see address above).
6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.
6.f. Sparks and spatter are thrown from the welding arc. Wear oil free
protective garments such as leather gloves, heavy shirt, cuffless
trousers, high shoes and a cap over your hair. Wear ear plugs
when welding out of position or in confined places. Always wear
safety glasses with side shields when in a welding area.
6.g. Connect the work cable to the work as close to the welding area
as practical. Work cables connected to the building framework or
other locations away from the welding area increase the
possibility of the welding current passing through lifting chains,
crane cables or other alternate circuits. This can create fire
hazards or overheat lifting chains or cables until they fail.
6.h. Also see item 1.c.
6.I. Read and follow NFPA 51B “Standard for Fire Prevention During
Welding, Cutting and Other Hot Work”, available from NFPA, 1
Batterymarch Park, PO box 9101, Quincy, MA 022690-9101.
6.j. Do not use a welding power source for pipe thawing.
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, 14501 George Carter Way
Chantilly, VA 20151.
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.
Refer to
http://www.lincolnelectric.com/safety
for additional safety information.
SAFETY
Safety 04 of 04 - 5/16/2018

v
SAFETY
v
PRÉCAUTIONS DE SÛRETÉ
Pourvotre propre protection lire et observer toutes les instruc-
tions et les précautions de sûreté speciques 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 soud-
er 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 pro-
téger 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.
3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:
a. Utiliser un bon masque avec un verre ltrant approprié
ainsi qu’un verre blanc an 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 an de protéger la
peau de soudeur et des aides contre le rayonnement de
l’arc.
c. Protéger l’autre personnel travaillant à proximité au
soudageà l’aide d’écrans appropriés et non-inamma-
bles.
4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection
libres de l’huile, tels que les gants en cuir, chemise épaisse,
pantalons sans revers, et chaussures montantes.
5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où l’on pique le laitier.
6. Eloigner les matériaux inammables ou les recouvrir an 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
échauement 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 lev-
age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauement des chaines et des
câbles jusqu’à ce qu’ils se rompent.
9. Assurer une ventilation susante 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 forte-
ment 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
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 dis-
positif 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 eectués par un électricien qualié.
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.

INSTALLATION............................................................................................................................................. SECTION A
TECHNICAL SPECIFICATIONS..................................................................................................................................... A-1
SAFETY PRECAUTIONS...............................................................................................................................................A-2
SUITABLE LOCATION................................................................................................................................................. A-2
INPUT CONNECTIONS................................................................................................................................................ A-2
INPUT VOLTAGE RECONNECT PROCEDURE................................................................................................................ A-3
OUTPUT CONNECTIONS............................................................................................................................................ A-4
OPERATION ................................................................................................................................................ SECTION B
SAFETY PRECAUTIONS.............................................................................................................................................. B-1
GENERAL DESCRIPTION.............................................................................................................................................B-1
CONTROLS AND SETTINGS........................................................................................................................................ B-2
OPTIONS / ACCESSORIES.............................................................................................................................SECTION C
MAINTENANCE............................................................................................................................................. SECTION D
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE...................................................................................................D-1
ROUTINE MAINTENANCE........................................................................................................................................... D-2
FILTER CAPACITOR CONDITIONING.............................................................................................................................D-2
LOCATION OF MAINTENANCE COMPONENTS.............................................................................................................D-3
TROUBLESHOOTING......................................................................................................................................SECTION E
DIAGRAMS .................................................................................................................................................SECTION F
PARTS LIST ............................................................................................................... PARTS.LINCOLNELECTRIC.COM
CONTENT/DETAILS MAY BE CHANGED OR UPDATED WITHOUT NOTICE. FOR MOST CURRENT INSTRUCTION MANUALS, GO
TO PARTS.LINCOLNELECTRIC.COM.
2
TABLE OF CONTENTS
CONSTANT CURRENT PROCESSES............................................................................................................................ B-3
PARALLEL OPERATION...............................................................................................................................................B-3
OVERLOAD PROTECTION........................................................................................................................................... B-3
THERMAL PROTECTION............................................................................................................................................. B-3
FAN...........................................................................................................................................................................B-3
POWER-UP SEQUENCE.............................................................................................................................................. B-3
CALIBRATION PROCEDURES......................................................................................................................................D-4

A-1
INSTALLATION
INVERTEC®V276
Technical Specifications - Invertec V276
Width
Weight (With Cord)
9.0 in.(229mm) 54.5lbs. (24.7Kg)
Height
13.6in.(345mm) - Handle Folded Down
16in.(406mm) - Handle Up
Depth
20.25 in.(514mm)
21.7 in.(551)-With Cord Strain Relief
PHYSICAL DIMENSIONS
SINGLE PHASETHREE PHASE
RECOMMENDED MINIMUM INPUT WIRE AND FUSE SIZES
Input Voltage-Hz
208/230-60
460/575-60
220-50
380/400/415-50
440-50
Fuse Size
(Time Delay Fuse)
Amps
60
35
60
35
35
Cord Size AWG(mm2)
based on a type S, SJ, SJO
or SJT Flexible cord
in 30°C Ambient
8(8.4)
14(2.5)
8(8.4)
12(4)
14(2.5)
(1) When operating on these inputs, the line cord may need to be changed
* On 208VAC Single Phase the 35% duty cycle output rating is 275A @ 29V
INPUT AT RATED OUTPUT - THREE PHASE ONLY
INPUT VOLTS-Hz
*208/230/460/575 - 60Hz
220/380/400/415/440 - 50Hz
INPUT
CURRENT
AMPS
27/25/13/11
35/33/17/14
*/37/19/16
23/14/13/13/12
26/16/16/13/13
IDLE
POWER
120W Max
IDLE
POWER
120W Max
EFFICIENCY
@ RATED
OUTPUT
85%
EFFICIENCY
@ RATED
OUTPUT
85%
OUTPUT
CONDITIONS
200A/28V/100%
250A/30V/60%
*275A/31V/35%
190A/27.6V/100%
220A/28.8V/60%
INPUT AT RATED OUTPUT - SINGLE PHASE ONLY
INPUT VOLTS-Hz
208/230 - 60Hz
460/575 - 60Hz
INPUT
CURRENT
AMPS
26/21
49/50
65/60
33/27
37/31
OUTPUT
CONDITIONS
200A/28V/100%
250A/30V/60%
200A/28V/100%
250A/30V/60%
275A/31V/35%
OUTPUT (THREE AND SINGLE PHASE)
Input Voltage-Hz
208-60
230-60
460/575-60
220-50
380/400/415-50
440-50
Cord Size AWG(mm2)
based on a type S, SJ, SJO
or SJT Flexible cord
in 30°C Ambient
6(16)1
6 (16)1
10 (6)
6(16)1
8(10)
10(6)
Fuse Size
(Time Delay Fuse)
Amps
100
100
60
100
60
60
TEMPERATURE RANGES
OPERATING TEMPERATURE RANGE
-20°C to +40°C
STORAGE TEMPERATURE RANGE
-40°C to +40°C
NO LOADWELDING
CURRENT RANGE
20-275 Amps 70 VDC
VOLTAGE
220/380/400/415/440 - 50Hz 42/27/26/26/25
50/33/30/29/29
*275A OUTPUT NOT APPLICABLE TO 208V INPUT
190A/27.6V/100%
220A/28.8V/60%

A-2
INSTALLATION
INVERTEC®V276
INSTALLATION
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this installation.
• Turn off input power to the power
source at the disconnect switch or
fuse box before working on this equipment. Turn off
the input power to any other equipment connected to
the welding system at the disconnect switch or fuse
box before working on the equipment.
• Do not touch electrically hot parts.
SELECT SUITABLE LOCATION
The Invertec®V276 will operate in harsh environments. Even
so, it is important that simple preventative measures are
followed in order to assure long life and reliable operation.
Where there is a combustible surface directly
under stationary or xed electrical equipment,
that surface shall be covered with a steel plate at
least .06”(1.6mm) thick, which shall extend not
less than 5.90”(150mm) beyond the equipment on
all sides.
HIGH FREQUENCY PROTECTION
Locate the In vertec®V276 away from radio controlled
machinery.
INPUT CONNECTIONS
The Invertec®V276 should be connected only by a qualified
electrician. Installation should be made in accordance with all
local and national electric codes and the information detailed
below.
Refer to the Technical Specifications page at the beginning of
this chapter for the proper fuse sizes and supply cable sizes.
• Fuse the input circuit with recommended super lag fuses
or delay type circuit breakers.
• Install the proper fuse in the fuse holder in the main
disconnect panel.
INPUT SUPPLY CONNECTIONS
Be sure the voltage phase and frequency of the input power is
as specified on the rating plate, located on the rear of the
Supply line entry provision is in the case rear panel.
POWER INPUT CONNECTION
A 10 ft. power cord is provided and wired into the machine.
Follow the power cord connection instructions. Incorrect
connection may result in equipment damage.
Single Phase Input: Connect green lead to ground per
National Electrical Code. Connect black and white or brown
leads to power. Wrap red lead with tape to provide 600V
insulation.
Three Phase Input: Connect green lead to ground per
National Electrical Code. Connect black, red and white or
brown leads to power.
WARNING
CAUTION
INPUT FUSE AND SUPPLY WIRE
machine.
• The machine must be located where there is free circulation
of clean air such that air movement in the back and out the
front will not be restricted.
• 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
shutdown.
• Keep machine dry. Shelter from rain and snow. Do not place
on wet ground or in puddles.
•DO NOT MOUNT OVER COMBUSTIBLE SURFACES.
STACKING
V276’s cannot be stacked.
TILTING
Place the machine directly on a secure, level surface or on a
recommended undercarriage. The machine may topple over if
this procedure is not followed.
The normal operation of the Invertec V276 may
adversely affect the operation of RF controlled
equipment, which may result in bodily injury or
damage to the equipment.
CAUTION

INPUT VOLTAGE RECONNECT
PROCEDURE
When received directly from the factory, units are con-
nected for, 460 VAC. If 460 VAC is the desired input,
then the machine may be connected to the power sys-
tem without any setup required inside the reconnect
door. For other voltages refer to the instructions locat-
ed on the Reconnect Panel Access Door or follow the
instructions below.
Failure to follow these instructions can cause
immediate failure of components within the
welder.
------------------------------------------------------------------------
1. Open the access door on the left side of the
machine.
2. For 208-230: Position the large switch to 208-230.
For 380-575: Position the large switch to 380-575.
3. Move the “A” lead to the appropriate terminal.
Refer to figure A.1 below.
THELINCOLNELECTRICCO.CLEVELAND,OHIOU.S.A.
.
.
.
.
Donottouchelectricallyliveparts.
Onlyqualifiedpersonsshouldinstall,
useorservicethisequipment.
RECONNECTPROCEDURE
1.BESUREPOWERSWITCHISOFF.
208V
220-230V
380-415V
440-460V
575V
'A'
INPUTVOLTAGERANGE.
removed.
Donotoperatewithwraparound
inspectingorservicingmachine.
Disconnectinputpowerbefore
IFMACHINECEASESTOOPERATE(NOMETER,NOFAN)
2.CONNECTLEAD'A'TODESIRED
3.POSITIONSWITCHTODESIREDINPUTVOLTAGERANGE.
S21230-
ANDTHEREISNOOTHERKNOWNFAILURE:CHECK FUSE;
VOLTAGE=380-575V
VOLTAGE=208-230V
REPLACEWITHSPECIFIEDFUSE.
A
T H E L I NCOLN ELECTR I C CO.CLEVELAND, O H I O U . S.A.
.
.
.
.
Do not touch electrically live parts.
Only qualified persons should install,
use orservice this equipment.
RECONNECT PROCEDURE
1. BE SURE POWER SWITCH IS OFF.
208V
220-230V
380-415V
440-460V
575V
'A'
INPUT VOLTAGE RANGE.
removed.
Do not operate withwraparound
inspecting or servicing machine.
Disconnect input power before
IF MACHINE CEASES TO OPERATE (NO METER, NO FAN)
2. CONNECT LEAD 'A' TO DESIRED
3. POSITION SWITCH TO DESIRED INPUT VOLTAGE RANGE.
S21230-
AND THERE IS NO OTHER KNOWN FAILURE: CHECK FUSE;
VOLTAGE=380-575VVOLTAGE=208-230V
REPLACE WITH SPECIFIED FUSE.
A
Figure A.1 Input Voltage Reconnect Instructions
CAUTION
INSTALLATION
INVERTEC®V276
A-3

OUTPUT CONNECTIONS
Refer to figure A.2 for the location of the 6-Pin
Remote Receptacle and the Output Terminals.
FIGURE A.2 OUTPUT CONNECTIONS
REMOTE CONTROL RECEPTACLE
Remote control (K857), Hand amptrol (K963) and
Foot amptrol (K870) connect directly to 6-pin amphe-
nol on the front of the unit.
OUTPUT CABLES
Select the output cable size based on Table A.1.
TABLE A.1
Cable Sizes for Combined Length of Electrode and
Work Cable ( Copper Cable Rated at 75°C).
Length Cable Size
up to 150 ft.(46m) 1/0 (50mm2)
up to 250 ft.(72m) 2/0 (70mm2)
QUICK DISCONNECT PLUGS
A quick disconnect system is used for the welding
cable connections.
1. Remove 1 in. (25mm) of welding cable insulation.
2. Slide rubber boot onto cable end. The boot end
may be trimmed to match the cable diameter.
Soap or other lubricant will help to slide the boot
over the cable.
3. Slide the copper tube into the brass plug.
4. Insert cable into copper tube.
5. Tighten set screw to collapse copper tube. Screw
must apply pressure against welding cable. The
top of the set screw will be well below the surface
of the brass plug after tightening.
6. Slide rubber boot over brass plug. The rubber
boot must be positioned to completely cover all
electrical surfaces after the plug is locked into the
receptacle.
25 mm
1 in.
WELDING CABLE
BOOT
TRIM
SET SCREW
BRASS PLUG
COPPER TUBE
REMOTE
ON
OFF
OUTPUT TERMINALS
6-PIN REMOTE RECEPTACLE
INSTALLATION
INVERTEC®V276
A-4

GENERAL DESCRIPTION
The Invertec V276 is a 275 amp arc welding power
source that utilizes single or three phase input power,
to produce constant current output. The welding
response of this Invertec has been optimized for stick
(SMAW) and TIG (GTAW).
OPERATIONAL FEATURES
The Invertec V276 provides continuous total range
output current adjustment, selectable welding modes
and local or remote output control. Welding character-
istics can be controlled via an arc force control.
Additionally, starting characteristics can be adjusted
via a “hot start” control.
WELDING CAPABILITY
The Invertec V276 is rated at 275 amps, 35% duty
cycle (based on a 10 minute cycle). It is also rated at
200 amps, 100% duty cycle, and 250 amps, 60% duty
cycle.
LIMITATIONS
The V276 is not recommended for pipe thawing.
Read and understand this entire section before
operating your machine.
SAFETY PRECAUTIONS
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts such
as output terminals or internal wiring.
• Insulate yourself from the work and
ground.
• Always wear dry insulating gloves.
____________________________________
____________________________________
____________________________________
____________________________________
Only qualified personnel should operate this equip-
ment. Observe all safety information throughout this
manual.
WARNING
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
ARC RAYS
can burn.
• Wear eye, ear and body
protection.
WELDING, CUTTING and
GOUGING SPARKS
can cause fire or explosion
• Keep flammable material away.
• Do not weld, cut or gouge on
containers that have held com-
bustibles.
OPERATION
INVERTEC®V276
B-1
STATUS
PROTECTIVE
GROUND
WARNING OR
CAUTION
GRAPHIC SYMBOLS THAT APPEAR ON
THIS MACHINE OR IN THIS MANUAL
HIGH TEMPERATURE
DANGEROUS
VOLTAGE
POSITIVE OUTPUT
NEGATIVE OUTPUT

1. POWER SWITCH- Place the lever in the “ON”
position to energize the machine. When the power is on
the output will be energized in STICK (SMAW) mode and
TIG (GTAW) if the remote is set to local control. At
power up the thermal Light and Fan will turn on for
approximately 3 seconds.
2. OUTPUT CONTROL- This controls the output
current. Control is provided over the entire output range
of the power source with (1) turn of the control knob. This
control may be adjusted while under load to change
power source output. When using remote control this
function becomes the maximum limit setting.
3. CURRENT DISPLAY- This display shows
the preset output current that is selected, from 0-
275A, when in Local Mode. When the power source
is set to Remote Mode, the preset current display is
showing the current limit that is set. When welding it
shows the actual current measured while under load.
After the arc is broken the last current measured will
flash for 5 seconds.
4. VOLTAGE DISPLAY
actual voltage measured across the output studs.
This reading is only displayed during welding.
TIG (GTAW) Optimized for touch start use. Short circuit
current is limited to approximately 20 amps to aid in touch
starting.
In TIG (GTAW) mode, the Local/Remote switch also con-
trols if the output is energized.
MODE LOCAL/REMOTE SWITCH OUTPUT
GTAW LOCAL ENERGIZED
GTAW REMOTE CONTROL BY
REMOTE ARC
SWITCH
SMAW LOCAL & REMOTE ENERGIZED
7. HOT START - Controls the amount of starting energy
in CC Stick (SMAW). The Hot Start can be either
turned on or off. When on, it provides a striking current at
160% of the set current or 275A whichever is less then
quickly reverts to the set current in 0.4 second.
CONTROLS AND SETTINGS
All operator controls and adjustments are located on the case front of the V276. Refer to Figure B.1 and corre-
sponding explanations.
FIGURE B.1 — CASE FRONT CONTROLS.
1
2
3
4
7
68
5
OPERATION
INVERTEC®V276
B-2
OUTPUT
6. MODE SWITCH
CC -Stick (SMAW) Use this mode for all stick welding.
Output energized when machine is on.
5. LOCAL/REMOTE SWITCH
“LOCAL” position to allow output adjustment at the
machine. Place in the “REMOTE” position to allow output
- Place in the
adjustment at remote pot or amptrol. In Remote, the
machine output control pot is the maximum limit setting
for remote control.
- This display shows the
After the arc is broken the last voltage and current
will flash for 5 seconds.
9
10
11

8. ARC FORCE - This control functions in CC Stick SMAW
modes to adjust the Arc Force. The arc is soft at the mini-
mum settings and more forceful or driving at the maximum
settings. Higher spatter levels may be present at the maxi-
mum settings. Full range is from -10(Soft) to +10(Crisp)
9. OUTPUT TERMINALS - These quick disconnect termi-
nals provide connection points for the electrode and work
cables. Refer to Output Connection in the Installation chap-
ter for proper cable sizes. For positive polarity welding con-
nect the electrode cable to the positive terminal and the work
cable to the negative terminal. To weld negative polarity
reverse the electrode and work cables.
10. THERMAL SHUTDOWN INDICATOR - This light will
illuminate if an internal thermostat has been activated.
Machine output will return after the internal components
have returned to a normal operating temperature. See
Thermal Protection later in this Operation chapter.
11. 6-PIN REMOTE RECEPTACLE
(Refer to Output Connection in the Installation chapter.)
CONSTANT CURRENT PROCESSES
SHIELDED METAL ARC WELDING (STICK)*
The Invertec may be utilized as a manual DC arc welder with
the electrode cable, work cable, and electrode holder being the
only equipment required.
AIR CARBON ARC CUTTING (GOUGING)*
Air carbon arc cutting may be performed with the Invertec within
its output rating using 3/16” diameter carbon rods. Output
cables, an air carbon arc electrode cable assembly, and a
source of compressed air are required.
TIG WELDING*
The Invertec V276 is capable of touch start TIG welding. An
electrode cable, work cable, TIG torch, and gas supply with reg-
ulator are required. Refer to Accessories section of this manu-
al.
Touch starting is done as follows:
1. Place the shield cup edge on the work piece.
2. Rock the tungsten down to touch.
3. Trigger the output, if using remote control.
4. Gently rock back the tungsten from the workpiece.
Note: The short circuit current is limited to 20 amps to aid in
touch starting. Panel output control becomes the current
limit setting when in remote control.
*Note:Operating this machine with the output control set to
maximum may cause the machine to phase back and the arc
to go out. This occurs because the welding current exceeded
300 amps and the machine’s protection circuitry activated.
Turn the output control down to correct this condition.
PARALLEL OPERATION
The Invertecs are operable in parallel. For best results, the cur-
rents of each machine should be reasonably well shared. As an
example, withtwomachines setup in parallel for a300 amp
procedure, each machine should be set to deliver approximately
150 amps, not 200ampsfrom oneand 100 amps from the
other. This will minimize nuisance feedback conditions. In gen-
eral, more than two machines in parallel will not be effective due
to the voltage requirements of procedures in that power range.
To set machine outputs, start with output control pots and arc
force pots in identical positions. Adjust outputs and arc forces to
maintain current sharing whileestablishing theproper output
current.
OVERLOAD PROTECTION
The machine is electrically protected from producing high output
currents. Should the output current exceed 300A, an electronic
protection circuit will reduce the current to less than 200A. The
machine will continue to produce this low current until the pro-
tection circuit is reset.Reset occurs when the output load is
removed.
Note: When TIG welding with the Output Knob at or above 275
Amps the Arc may go out.
THERMAL PROTECTION
Thermostats protect the machine from excessive operating tem-
peratures. Excessive temperatures may be caused by a lack of
cooling air or operating the machine beyond the duty cycle and
output rating. If excessive operating temperature should occur,
the thermostats will prevent output voltage or current.
Thermostats are self-resetting once the machine cools suffi-
ciently.
FAN
The cooling fan on the V276 operates once 15 amps of weld-
ing current is drawn and for 7 minutes after the output current
has stopped flowing.
The fan will also run anytime the machine has over heated.
POWER-UP SEQUENCE
At power up the thermal light turns on and the fans run for
approximately 3 sec-onds. This is the pre-charge time for the
main capacitors. After this time the fans and thermal light turn
off and the pre-charge relay closes to apply full line power to
the capacitors. At this time the machine is ready to weld.
OPERATION
INVERTEC®V276
B-3

OPTIONS / ACCESSORIES
REMOTE OUTPUT CONTROL - Consists of a control
box with choice of two cable lengths. Permits remote
adjustment of output, 6 pin connection.
Order K857 for 25 ft. (7.6m) or
K857-1 for 100 ft. (30.5m)
TIG OPTIONS
Hand Amptrol - may be used in place of the Foot
Amptrol. Fastens to the torch for convenient thumb
control. Comes with a 25 ft. (7.6m) cable.
Order K963-1 (for smaller handle 9, 17 or 20 series
torches.)
Order K963-2 (for larger handle 18 or 26 series torch-
es.)
STICK OPTIONS
Accessory Kit - Complete kit for stick welding.
Includes 30 ft. (9.1m) #3 electrode cable, 25 ft. (7.6m)
#3 work cable, headshield, work clamp and electrode
holder.
Order K704 for 400 Amps
Order K875 for 200 Amps.
V276 4-Pack and 8-Pack Inverter Racks Includes:
• Inverter Rack
• An ideal system to group several inverter power
sources in an industrially designed portable pack-
age. Entire system meets National Electric Code
(NEC) standards.
• Includes 4 or 8 Invertec V276 rack model power
sources. This special rack version has all the same
features as the standard V276.
ACCESSORIES
INVERTEC®V276
C-1
Tweco Style Plug (Male)-For 1/0-2/0 (50-70mm )
cable.
Order K3416-70
Tweco Style Plug (Female)- For 1/0-2/0 (50-
2
2
70mm ) cable.
Order K3417-70
Twist-Mate Cable Plug - For connecting welding
cable to output terminal receptacles. For 1/0-2/0 (50-
70mm2) cable.
Order K852-70
Twist-Mate Cable Plug - For connecting welding
cable to output terminal receptacles. For 2/0-3/0 (70-
95mm2) cable.
Order K852-95
Twist-Mate Cable Receptacle - For connecting weld-
ing cable to Twist-Mate cable plug. For 1/0-2/0 (50-
70mm2) cable.
Order K1759-70
Twist-Mate Cable Receptacle - For connecting weld-
ing cable to Twist-Mate cable plug. For 2/0-3/0 (70-
95mm2) cable.
Order K1759-95
TIG OPTIONS
Tweco Style TIG Torch Adapter
Order K960-1
Twist-Mate Torch Adapter - For connection of PTA-9
or PTA-17V torches (1 piece cable) to power sources
without as passing through the Twist-Mate connec-
tion.
Order K960-1
Foot Amptrol™ - Varies current while welding for
making critical TIG welds and crater filling. Depress
pedal to increase current. Depressing pedal fully
achieves maximum set current. Fully raising the
pedal finishes the weld and starts the after flow cycle.
Includes 25 ft. (7.6m) control cable.
Order K870

INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE
1. Turn off input power or disconnect input power
lines.
2. Remove the 5/16" hex head screws from the side
and top of the machine and remove wrap-around
machine cover.
3. Be careful not to make contact with the capacitor
terminals that are located in the top and bottom of
the Power Board.
4. Obtain a high resistance and high wattage resistor
(25-1000 ohms and 25 watts minimum). This resis-
tor is not supplied with machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
5. Locate the four capacitor terminals (large hex head
cap screws) shown in Figure D.1. One pair at the
top and one pair at the bottom of the Power Board.
6. Use electrically insulated gloves and insulated pli-
ers. Hold body of the resistor and connect resistor
leads across the two capacitor terminals. Hold
resistor in place for 10 seconds. DO NOT TOUCH
CAPACITOR TERMINALS WITH YOUR BARE
HANDS.
7. Repeat discharge procedure for the capacitor on
other two terminals.
8. Check voltage across terminals of all capacitors
with a DC voltmeter. Polarity of capacitor terminals
is marked on PC board above terminals. Voltage
should be zero. If any voltage remains, repeat this
capacitor discharge procedure.
ELECTRIC SHOCK can kill.
• Have an electrician install and service
this equipment.
•Turn the input power off at the fuse
box before working on equipment.
• Do not touch electrically hot parts.
• Prior to Performing preventative main-
tenance, perform the following capaci-
tor discharge procedure to avoid elec-
tric shock.
---------------------------------------------------------------------
WARNING
UPPER
CAPACITOR TERMINALS
LOWER
CAPACITOR
TERMINALS
INSULATED
GLOVES
INSULATED
PLIERS
POWER
RESISTOR
POWER
BOARD
RIGHT SIDE OF MACHINE
FIGURE D.1 — LOCATION OF INPUT FILTER CAPACITOR TERMINALS.
MAINTENANCE
INVERTEC®V276
D-1

ROUTINE MAINTENANCE
1. Perform the following preventive maintenance pro-
cedures at least once every six months. It is good
practice to keep a preventive maintenance record;
a record tag attached to the machine works best.
2. Remove the machine wrap-around cover and per-
form the input filter capacitor discharge procedure
(detail at the beginning of this chapter).
3. Keeping the machine clean will result in cooler
operation and higher reliability. Be sure to clean the
following areas with a low pressure air stream. See
figure D.2 for component locations.
•Power and control printed circuit boards
•Power switch
•Main transformer
•Input rectifier
•Heat sink fins
•Input Filter Capacitors
•Output Terminals
4. Examine capacitors for leakage or oozing. Replace
if needed.
5. Examine the sheet metal case for dents or break-
age. Repair the case as required. Keep the case in
good condition to ensure that high voltage parts are
protected and correct spacings are maintained. All
external sheet metal screws must be in place to
assure case strength and electrical ground continu-
ity.
6. Check electrical ground continuity. Using an ohm-
meter, measure resistance between either output
terminal and an unpainted surface of the machine
case. (See Figure D.2 for locations.) Meter reading
should be 500,000 ohms or more. If meter reading
is less than 500,000 ohms, check for electrical com-
ponents that are not properly insulated from the
case. Correct insulation if needed.
7. Replace machine cover and screws.
MAINTENANCE
INVERTEC®V276
D-2

FIGURE D.2 — LOCATION OF MAINTENANCE COMPONENTS.
SWITCH BOARD &
HEAT SINK ASSEMBLY
CONTROL PC BOARD
MAIN TRANSFORMER ASSEMBLY
CHOKE ASSEMBLY
OUTPUT TERMINALS
POWER SWITCH
CENTER ASSEMBLY
INPUT
RECTIFIER
COOLING FANS
CASE BACK ASSEMBLY
CASE FRONT ASSEMBLY
WRAP-AROUND
BASE
OUTPUT
RECTIFIER
ASSEMBLY
MAINTENANCE
INVERTEC®V276
D-3

MAINTENANCE
INVERTEC®V276
D-4
DETERMINING CURRENT AND VOLTAGE
OFFSETS
•For the current offset take the reading from the
calibrated shunt and subtract the reading from the
V276’s meter.
•For the voltage offset take the reading from the
calibrated meter and subtract the reading from
the V276’s meter.
•Record these numbers. These values (-10 to 10
for current; -3 to 3 for voltage) are what you will
enter into the machine to adjust calibration
HOW TO ENTER CALIBRATION MODE
1. Power machine on.
2. Put in GTAW Mode, ARC FORCE to 0, and HOT
START off.
3. Turn output control knob all the way counter-
clockwise.
4. Turn output control knob all the way clockwise.
5. Turn output control knob all the way counter-
clockwise.
6. Steps 3-5 describe 1 knob turn cycle, repeat 3-5
an additional 4 times for a total of 5 cycles. 5
cycles must be completed within 20 seconds to
enter calibration mode.
7. Calibration mode has been entered. The display
will show old in addition to a number on the other
display.
8. Toggle the local/remote switch to change
between viewing previously set A and V offsets.
(machine’s factory default is 0A and 0.0V offsets).
9. Move the SMAW/GTAW switch to SMAW to
change the A and V calibration offsets.
10. While SMAW and REMOTE are selected, use
the output control knob to change the voltage
offset (-3.0 to 3.0V).
11. While SMAW and LOCAL are selected, use
the output control knob to change the current
offset (-10A to 10A).
NOTE: Both Current and voltage must be
calibrated at the same time. If the offset on one is
zero, be sure to set the offset to zero.
12. To save your selections put the switch in
GTAW, the previously selected values are now
present (marked old on display) and viewable for
A and V using the LOCAL/REMOTE Switch.
13. When finished making adjustments, cycle
power to the machine. Please allow 5 seconds
with the switch in the OFF position before turning
back ON.
14. The changes are now saved and will remain
saved until overwritten by entering calibration
mode again.
CALIBRATION PROCEDURES
TIPS FOR CALIBRATION
TIPS FOR USING A LOAD BANK
•Set the load bank for 100A over the maximum
output of the machine under test.
•Set the machine under test to its 100% IEC rated
current.
•Apply load.
•At rated current, the voltage should be
Voltage=Current*.04+20
•If needed remove load and adjust load bank to
get the desired load. (Current and Voltage)
TIPS FOR CURRENT CALIBRATION VERIFICATION
•Select the proper equipment. Current should be
measured using a certified, calibrated shunt and
millivolt meter.
•Locate the meter a minimum of 5ft (1.5m) from
the power source. Theoretically, the current flow
is the same anywhere in a closed loop path, but it
is good practice keep the meter away from the
power source to reduce the likelihood of electrical
interference.
TIPS FOR VOLTAGE CALIBRATION VERIFICATION
•Calibrate at the output studs whenever possible.
•Special filtering may be required for accurate
measurement of the stud voltage. The output
voltage waveform at the studs can be vastly
different than the voltage waveform at the load.
This is primarily due to the inductive reactance of
the weld cables.
oM25303-1 Filter kit is available to bypass
inverter noise.
•Never place the meter on or near the power
source or weld cables. Any reasonable
separation distance will reduce the likelihood of
electrical interference.
INVERTEC V276 CALIBRATION
PROCEDURE
LOAD BANK INSTRUCTIONS
1. Connect machine output studs to load bank and
testing equipment (see TIPS FOR CALIBRATION
section for proper testing equipment)
2. Set load bank to 375A
3. Turn on Invertec V276
4. Place mode toggle switch into SMAW mode
5. Turn output knob until current meter reads 200
6. Turn on load bank.
7. Apply load
8. Adjust output knob until calibrated shunt reads a
millivolt signal equal to 200A
9. Check output voltage AT THE STUDS with a
calibrated volt meter
10. Check against meters on the V276
11. Record readings and differences.

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
This Troubleshooting Guide is provided to help you
locate and repair possible machine malfunctions.
Simply follow the three-step procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM).
Look under the column labeled “PROBLEM (SYMP-
TOMS)”. This column describes possible symptoms
that the machine may exhibit.Find the listing that
best describes the symptom that the machine is
exhibiting.
Step 2. POSSIBLE CAUSE.
The second column labeled “POSSIBLE CAUSE” lists
the obvious external possibilities that may contribute
to the machine symptom.
Step 3. RECOMMENDED COURSE OF ACTION
This column provides a course of action for the
Possible Cause, generally it states to contact your
local Lincoln Authorized Field Service Facility.
If you do not understand or are unable to perform the
Recommended Course of Action safely, contact your
local Lincoln Authorized Field Service Facility.
HOW TO USE TROUBLESHOOTING GUIDE
Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician and
machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical
Shock, please observe all safety notes and precautions detailed throughout this manual.
__________________________________________________________________________
WARNING
TROUBLESHOOTING
INVERTEC®V276
E-1