MK Products CobraTurn T-260 User manual

Owner’s Manual
Product: CobraTurn T-260
Digital Turntable
Manual: 091-0751
Serial: 19100001
Voltage Rating: 120 VAC
Revision: -A-
Model Number: 127-008
®

Table of Contents
Safety Considerations ........................................................................i-iii
Specications .......................................................................... Section A
Unit Specications..............................................................................................1
Load Specications............................................................................................1
Dimensions ........................................................................................................2
Operation.................................................................................Section B
Initial Setup ........................................................................................................3
Operating Procedure..........................................................................................4
Weld Ground 5 AMP Fuse .................................................................................5
Circuit Breaker ...................................................................................................5
Calibration Procedure ........................................................................................5
Display Messages..............................................................................................6
Controls and Connections..................................................................................7
Accessories .............................................................................Section C
Kits .....................................................................................................................8
Trouble Shooting .....................................................................Section D
Trouble Shooting................................................................................................9
Appendicies.............................................................................Section E
Diagrams / Parts List........................................................................................10
Main Assembly............................................................................................... 11
Front Panel Assembly ....................................................................................13
Electrical.........................................................................................................14
Safety Warnings
Warranty

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CobraTurn® T-260 Digital Turntable Owner's Manual - Page i
SAFETY CONSIDERATIONS
ELECTRIC ARC WELDING EQUIPMENT
CAUTION : READ BEFORE ATTEMPTING INSTALLATION, OPERATION OR
MAINTENANCE OF THIS EQUIPMENT
1-1 INTRODUCTION
This equipment is intended for ultimate
application by commercial/industrial users
and for operation by persons trained and
experienced in the use and maintenance
of welding equipment. Operation should
not be undertaken without adequate train-
ing in the use of such equipment. Training
is available from many public and private
schools or similar facilities.
Safe practices in the installation, opera-
tion and maintenance of this equipment
requires proper training in the art, a care-
ful study of the information provided with
the equipment, and the use of common
sense. Rules for safe use are generally
provided by suppliers of welding power
sources, compressed gas suppliers, and
electrode suppliers. Careful compliance
with these rules will promote safe use of
this equipment.
The following Safety Rules cover some
of the more generally found situations.
READ THEM CAREFULLY. In case of
any doubt, obtain qualied help before
proceeding.
1-2 GENERAL PRECAUTIONS
A. Burn Prevention
ELECTRIC ARC WELDING PRODUCES
HIGH INTENSITY HEAT AND ULTRA-
VIOLET RADIANT ENERGY WHICH
MAY CAUSE SERIOUS AND PERMA-
NENT EYE DAMAGE AND WHICH MAY
DAMAGE ANY EXPOSED SKIN AREAS.
Wear helmet with safety goggles or
glasses with side shields underneath,
appropriate lter lenses or plates (pro-
tected by clear cover glass). This is a
must for welding or cutting (and chipping)
to protect the eyes from radiant energy
and ying metal. Replace cover glass
when broken, pitted, or spattered.
Medical first aid and eye treatment.
First aid facilities and a qualied rst aid
person should be available for each shift
unless medical facilities are close by for
immediate treatment of ash burns of the
eyes and skin burns.
Wear protective clothing - leather (or
asbestos) gauntlet gloves, hat, and high
safety-toe shoes. Button shirt collar and
pocket aps, and wear cu󰀪ess trousers
to avoid entry of sparks and slag.
Avoid oily or greasy clothing. A spark
may ignite them.
Flammable hair preparations should not
be used by persons intending to weld
or cut.
Hot metal such as electrode stubs and
work pieces should never be handled
without gloves.
Ear plugs should be worn when working on
overhead or in a conned space. A hard hat
should be worn when others work overhead.
B. Toxic Fume Prevention
WARNING: The use of this product may
result in exposure to chemicals known to
the State of California to cause cancer and
birth defects or other reproductive harm.
Adequate ventilation. Severe discomfort, ill-
ness or death can result from fumes, vapors,
heat, or oxygen enrichment or depletion that
welding (or cutting) may produce. Prevent
them with adequate ventilation. NEVER
ventilate with oxygen.
Lead-, cadmium-, zinc-, mercury-, beryllium-
bearing and similar materials, when welded
or cut, may produce harmful concentrations
of toxic fumes. Adequate local exhaust ven-
tilation must be used, or each person in the
area, as well as the operator, must wear an
air-supplied respirator. For beryllium, both
must be used.
Metals coated with or containing materials
that emit toxic fumes should not be heated
unless coating is removed form the work
surface, the area is well ventilated, or the
operator wears an air-supplied respirator.
Work in a conned space only while it is
being ventilated and, if necessary, while
wearing an air-supplied respirator.
Gas leaks in a conned space should be
avoided. Leaked gas in large quantities
can change oxygen concentration danger-
ously. Do not bring gas cylinders into a
conned space.
Leaving confined space, shut OFF gas
supply at source to prevent possible accu-
mulation of gases in the space if down-
stream valves have been accidentally
opened or left open. Check to be sure that
the space is safe before reentering it.
Vapors from chlorinated solvents can be
decomposed by the heat of the arc (or
ame) to form PHOSGENE, a highly toxic
gas, and other lung and eye irritating prod-
ucts. The ultraviolet (radiant) energy of the
arc can also decompose trichloroethylene
and perchloroethylene vapors to form phos-
gene. DO NOT WELD or cut where solvent
vapors can be drawn into the welding or cut-
ting atmosphere or where the radiant energy
can penetrate to atmospheres containing
even minute amounts of trichloroethylene
or perchloroethylene.
C. Fire and Explosion Prevention
Causes of re and explosion are: com-
bustibles reached by the arc, ame, ying
sparks, hot slag, or heated material, misuse
of compressed gases and cylinders, and
short circuits.
BE AWARE THAT ying sparks or fall-
ing slag can pass through cracks, along
pipes, through windows or doors, and
through wall or oor openings, out of
sight of the goggled operator. Sparks
can y many feet.
To prevent res and explosion:
Keep equipment clean and operable, free
of oil, grease, and (in electrical parts) of
metallic particles that can cause short
circuits.
If combustibles are in area, do NOT weld
or cut. Move the work if practicable, to
an area free of combustibles. Avoid paint
spray rooms, dip tanks, storage areas,
ventilators. If the work cannot be moved,
move combustibles at least 35 feet away,
out of reach of sparks and heat; or protect
against ignition with suitable and snug-
tting, re-resistant covers or shields.
Walls touching combustibles on oppo-
site sides should not be welded on (or
cut). Walls, ceilings, and oor near work
should be protected by heat-resistant
covers or shields.
Fire watcher must be standing by with
suitable fire extinguishing equipment
during and for some time after welding
or cutting if:
1. Appreciable combustibles (including
building construction) are within 35 feet.
2. Appreciable combustibles are further
than 35 feet, but can be ignited by sparks.
3. Openings (concealed or visible) in
oors or walls within 35 feet may expose
combustibles to sparks.
4. Combustibles adjacent to walls, ceil-
ings, roofs, or metal partitions can be
ignited by radiant or conducted heat.
Hot work permit should be obtained
before operation to ensure supervisor’s
approval that adequate precautions have
been taken.
After work is done, check that area is free
of sparks, glowing embers, and ames.
An empty container that held combus-
tibles, or that can produce ammable or
toxic vapors when heated, must never be
welded on or cut, unless container has
rst been cleaned in accordance with
industry standards.
This includes: a thorough steam or
caustic cleaning (or a solvent of water
washing, depending on the combustible’s
solubility), followed by purging and inert-
ing with nitrogen or carbon dioxide, and
using protective equipment.

CobraTurn® T-260 Digital Turntable Owner's Manual - Page ii
Water-lling just below working level may
substitute for inerting.
A container with unknown contents
should be cleaned (see paragraph
above). Do NOT depend on sense of
smell or sight to determine if it is safe to
weld or cut.
Hollow castings or containers must be
vented before welding or cutting. They
can explode.
Explosive atmospheres. NEVER weld
or cut where the air may contain am-
mable dust, gas, or liquid vapors (such
as gasoline).
D. Compressed Gas Equipment
The safe handling of compressed gas
equipment is detailed in numerous indus-
try publications. The following general
rules cover many of the most common
situations.
1. Pressure Regulators
Regulator relief valve is designed to
protect only the regulator from overpres-
sure; it is not intended to protect any
downstream equipment. Provide such
protection with one or more relief devices.
Never connect a regulator to a cylinder
containing gas other than that for which
the regulator was designed.
Remove faulty regulator from service
immediately for repair (rst close cylinder
valve). The following symptoms indicate
a faulty regulator:
Leaks - if gas leaks externally.
Excessive Creep - if delivery pressure
continues to rise with downstream valve
closed.
Faulty Gauge - if gauge pointer does not
move o󰀨 stop pin when pressurized, nor
returns to stop pin after pressure release.
Repair. Do NOT attempt repair. Send
faulty regulators for repair to manufac-
turer’s designated repair center, where
special techniques and tools are used
by trained personnel.
2. Cylinders
Cylinders must be handled carefully to
prevent leaks and damage to their walls,
valves, or safety devices:
Avoid electrical circuit contact with cylin-
ders including third rails, electrical wires,
or welding circuits. They can produced
short circuit arcs that may lead to a seri-
ous accident. (See 1-3C)
ICC or DOT marking must be on each
cylinder. It is an assurance of safety
when the cylinder is properly handled.
Identifying gas content. Use only cylin-
ders with name of gas marked on them;
do not rely on color to identify gas con-
tent. Notify supplier if unmarked. NEVER
DEFACE or alter name, number, or other
markings on a cylinder. It is illegal and
hazardous.
Empties: Keep valves closed, replace
caps securely; mark MT; keep them sepa-
rate from FULLS, and return promptly.
Prohibited use. Never use a cylinder or its
contents for other than its intended use,
NEVER as a support or roller.
Locate or secure cylinders so they cannot
be knocked over.
Passageways and work areas. Keep cyl-
inders clear of areas where they may be
stuck.
Transporting cylinders. With a crane, use
a secure support such as a platform or
cradle. Do NOT lift cylinders o󰀨 the ground
by their valves or caps, or by chains, slings,
or magnets.
Do NOT expose cylinders to excessive heat,
sparks, slag, and ame, etc. that may cause
rupture. Do not allow contents to exceed
55 degrees C (130 degrees F.) Cool with
water spray where such exposure exists.
Protect cylinders, particularly valves from
bumps, falls, falling objects, and weather.
Replace caps securely when moving cyl-
inders.
Stuck valve. Do NOT use a hammer or
wrench to open a cylinder valve that cannot
be opened by hand. Notify your supplier.
Mixing gases. NEVER try to mix any gases
in a cylinder.
NEVER rell any cylinder.
Cylinder ttings should never be modied
or exchanged.
3. Hose
Prohibited use. Never use hose other
than that designed for the specied gas. A
general hose identication rule is: red for
fuel gas, green for oxygen, and black for
inert gases.
Use ferrules or clamps designed for the
hose (not ordinary wire or other substitute)
as a binding to connect hoses to ttings.
No copper tubing splices. Use only stan-
dard brass ttings to splice hose.
Avoid long runs to prevent kinks and abuse.
Suspend hose o󰀨 ground to keep it from
being run over, stepped on, or otherwise
damaged.
Coil excess hose to prevent kinks and
tangles.
Protect hose from damage by sharp edges,
and by sparks, slag, and open ame.
Examine hose regularly for leaks, wear, and
loose connections. Immerse pressured
hose in water; bubbles indicate leaks
Repair leaky or worn hose by cutting area
out and splicing. Do NOT use tape.
4. Proper Connections
Clean cylinder valve outlet of impurities that
may clog orices and damage seats before
connecting regulator. Except for hydrogen,
crack valve momentarily, pointing outlet
away from people and sources of ignition.
Wipe with a clean, lintless cloth.
Match regulator to cylinder. Before con-
necting, check that the regulator label
and cylinder marking agree, and that the
regulator inlet and cylinder outlet match.
NEVER Connect a regulator designed for a
particular gas or gases to a cylinder contain-
ing any other gas.
Tighten connections. When assembling
threaded connections, clean and smooth
seats where necessary. Tighten. If con-
nection leaks, disassemble, clean, and
retighten, using properly tting wrench.
Adapters. Use a CGA adapter (available
from your supplier) between cylinder
and regulator, if one is required. Use
two wrenches to tighten adapter marked
RIGHT and LEFT HAND threads.
Regulator outlet (or hose) connections
may be identied by right hand threads
for oxygen and left hand threads (with
grooved hex on nut or shank) for fuel gas.
5. Pressurizing Steps:
Drain regulator of residual gas through
suitable vent before opening cylinder
(or manifold valve) by turning adjusting
screw in (clockwise). Draining prevents
excessive compression heat at high
pressure seat by allowing seat to open
on pressurization. Leave adjusting
screw engaged slightly on single-stage
regulators.
Stand to side of regulator while opening
cylinder valve.
Open cylinder valve slowly so that regu-
lator pressure increases slowly. When
gauge is pressurized (gauge reaches
regulator maximum) leave cylinder valve
in following position: for oxygen and inert
gases, open fully to seal stem against
possible leak; for fuel gas, open to less
than one turn to permit quick emergency
shut-o󰀨.
Use pressure charts (available from your
supplier) for safe and e󰀩cient recom-
mended pressure settings on regulators.
Check for leaks on rst pressurization
and regularly thereafter. Brush with soap
solution. Bubbles indicate leaks. Clean
o󰀨 soapy water after test; dried soap is
combustible.
E. User Responsibilities
Follow all Safety Rules.
Remove leaky or defective equipment
from service immediately for repair. Read
and follow user manual instructions.
F. Leaving Equipment Unattended
Close gas supply at source and drain gas.
G. Rope Staging-Support
Rope staging-support should not be
used for welding or cutting operation;
rope may burn.
1-3 ARC WELDING
Comply with precautions in 1-1, 1-2, and
this section. Arc Welding, properly done,
is a safe process, but a careless operator
invites trouble. The equipment carries
high currents at significant voltages.
The arc is very bright and hot. Sparks
y, fumes rise, ultraviolet and infrared
energy radiates, weldments are hot,
and compressed gases may be used.
The wise operator avoids unnecessary
risks and protects himself and others
from accidents.