Instruction Manual
Installation, Operation and Service
Prest-O-Lite® 550 Plasma Cutter
Prest-O-Lite® 550 Plasma Cutter P/N 0558006058 - 230 V, 1-Phase, 50/60 Hz - North America
Form No: 0558006082 03 / 2007
BE SURE THIS INFORMATION REACHES THE OPERATOR.
YOU CAN GET EXTRA COPIES THROUGH YOUR SUPPLIER.
CAUTION
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the
principles of operation and safe practices for arc welding and cutting equipment, we urge
you to read our booklet, “Precautions and Safe Practices for Arc Welding, Cutting, and
Gouging,” Form 52-529. Do NOT permit untrained persons to install, operate, or maintain
this equipment. Do NOT attempt to install or operate this equipment until you have read
and fully understand these instructions. If you do not fully understand these instructions,
contact your supplier for further information. Be sure to read the Safety Precautions before installing or operating this equipment.
USER RESPONSIBILITY
This equipment will perform in conformity with the description thereof contained in this manual and accompanying labels and/or inserts when installed, operated, maintained and repaired in accordance with the instructions provided. This equipment must be checked periodically. Malfunctioning or poorly maintained equipment
should not be used. Parts that are broken, missing, worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, the manufacturer recommends that a telephone
or written request for service advice be made to the Authorized Distributor from whom it was purchased.
This equipment or any of its parts should not be altered without the prior written approval of the manufacturer.
The user of this equipment shall have the sole responsibility for any malfunction which results from improper
use, faulty maintenance, damage, improper repair or alteration by anyone other than the manufacturer or a service facility designated by the manufacturer.
TABLE OF CONTENTS
Section / Title Page
1.0 Safety Precautions ......................................................................................................................................................................5
1.1 Safety - English ...............................................................................................................................................................
1.2 Safety - Spanish .............................................................................................................................................................9
1.3 Safety - French .............................................................................................................................................................13
2.0 Description ..................................................................................................................................................................................17
2.1 General .......................................................................................................................................................................... 17
2.2 Scope .............................................................................................................................................................................. 17
2.3 Packages Available .................................................................................................................................................... 17
2.4 Specifications .............................................................................................................................................................. 18
5
3.0 Installation ...................................................................................................................................................................................
3.1 General ...........................................................................................................................................................................21
3.2 Equipment Required .................................................................................................................................................21
3.3 Location ..........................................................................................................................................................................21
3.4 Inspection ......................................................................................................................................................................21
3.5 Primary Electrical Input Connections ..................................................................................................................21
3.6 Secondary (Output) Connections ........................................................................................................................ 22
3.7 Connecting Prest-O-Lite
4.0 Operation ....................................................................................................................................................................................
4.1 Operation ......................................................................................................................................................................
4.2 Prest-O-Lite® 550 Controls ...................................................................................................................................... 25
4.3 Assembling PT-31XL Consumable Parts ............................................................................................................ 26
4.4 Cutting with the PT-31XL ........................................................................................................................................ 26
4.5 Operating Techniques ..............................................................................................................................................
4.6 Common Cutting Problems ................................................................................................................................... 28
5.0 Maintenance ...............................................................................................................................................................................
5.1 General .......................................................................................................................................................................... 29
5.2 Inspection and Cleaning ......................................................................................................................................... 29
4.3 Flow Switch .................................................................................................................................................................. 29
®
550 ................................................................................................................................ 23
21
25
25
28
29
6.0 Troubleshooting ....................................................................................................................................................................... 31
6.1 Troubleshooting ......................................................................................................................................................... 31
6.2 Troubleshooting Guide ............................................................................................................................................ 31
6.3 Sequence of Operation ............................................................................................................................................36
7.0 Replacement Parts ....................................................................................................................................................................37
7.1 General ...........................................................................................................................................................................
7.2 Ordering .........................................................................................................................................................................37
37
TABLE OF CONTENTS
4
SECTION 1 SAFETY PRECAUTIONS
1.0 Safety Precautions
WARNING: These Safety Precautions are
for your protection. They summarize precautionary information from the references
listed in Additional Safety Information section. Before performing any installation or operating
procedures, be sure to read and follow the safety
precautions listed below as well as all other manuals,
material safety data sheets, labels, etc. Failure to observe
Safety Precautions can result in injury or death.
PROTECT YOURSELF AND OTHERS -Some welding, cutting, and gouging
processes are noisy and require ear
protection. The arc, like the sun, emits
ultraviolet (UV) and other radiation
and can injure skin and eyes. Hot metal can cause
burns. Training in the proper use of the processes
and equipment is essential to prevent accidents.
Therefore:
1. Always wear safety glasses with side shields in any
work area, even if welding helmets, face shields, and
goggles are also required.
2. Use a face shield fitted with the correct filter and
cover plates to protect your eyes, face, neck, and
ears from sparks and rays of the arc when operating or observing operations. Warn bystanders not
to watch the arc and not to expose themselves to
the rays of the electric-arc or hot metal.
3. Wear flameproof gauntlet type gloves, heavy long-
sleeve shirt, cuffless trousers, high-topped shoes,
and a welding helmet or cap for hair protection, to
protect against arc rays and hot sparks or hot metal.
A flameproof apron may also be desirable as protection against radiated heat and sparks.
4. Hot sparks or metal can lodge in rolled up sleeves,
trouser cuffs, or pockets. Sleeves and collars should
be kept buttoned, and open pockets eliminated from
the front of clothing.
5. Protect other personnel from arc rays and hot
sparks with a suitable non-flammable partition or
curtains.
6. Use goggles over safety glasses when chipping slag
or grinding. Chipped slag may be hot and can fly far.
Bystanders should also wear goggles over safety
glasses.
1.1 Safety - English
FIRES AND EXPLOSIONS -- Heat from
flames and arcs can start fires. Hot
slag or sparks can also cause fires and
explosions. Therefore:
1. Remove all combustible materials well away from
the work area or cover the materials with a protective non-flammable covering. Combustible materials
include wood, cloth, sawdust, liquid and gas fuels,
solvents, paints and coatings, paper, etc.
2. Hot sparks or hot metal can fall through cracks or
crevices in floors or wall openings and cause a hidden smoldering fire or fires on the floor below. Make
certain that such openings are protected from hot
sparks and metal.“
3. Do not weld, cut or perform other hot work until the
workpiece has been completely cleaned so that there
are no substances on the workpiece which might
produce flammable or toxic vapors. Do not do hot
work on closed containers. They may explode.
4. Have fire extinguishing equipment handy for instant
use, such as a garden hose, water pail, sand bucket,
or portable fire extinguisher. Be sure you are trained
in its use.
5. Do not use equipment beyond its ratings. For example, overloaded welding cable can overheat and
create a fire hazard.
6. After completing operations, inspect the work area
to make certain there are no hot sparks or hot metal
which could cause a later fire. Use fire watchers when
necessary.
7. For additional information, refer to NFPA Standard
51B, "Fire Prevention in Use of Cutting and Welding
Processes", available from the National Fire Protection Association, Batterymarch Park, Quincy, MA
02269.
ELECTRICAL SHOCK -- Contact with
live electrical parts and ground can
cause severe injury or death. DO NOT
use AC welding current in damp areas,
if movement is confined, or if there is
danger of falling.
5
SECTION 1 SAFETY PRECAUTIONS
1. Be sure the power source frame (chassis) is connected to the ground system of the input power.
2. Connect the workpiece to a good electrical
ground.
3. Connect the work cable to the workpiece. A poor
or missing connection can expose you or others
to a fatal shock.
4. Use well-maintained equipment. Replace worn or
damaged cables.
5. Keep everything dry, including clothing, work
area, cables, torch/electrode holder, and power
source.
6. Make sure that all parts of your body are insulated
from work and from ground.
7. Do not stand directly on metal or the earth while
working in tight quarters or a damp area; stand
on dry boards or an insulating platform and wear
rubber-soled shoes.
8. Put on dry, hole-free gloves before turning on the
power.
3. Welders should use the following procedures to
minimize exposure to EMF:
A. Route the electrode and work cables together.
Secure them with tape when possible.
B. Never coil the torch or work cable around your
body.
C. Do not place your body between the torch and
work cables. Route cables on the same side of
your body.
D. Connect the work cable to the workpiece as close
as possible to the area being welded.
E. Keep welding power source and cables as far
away from your body as possible.
FUMES AND GASES -- Fumes and
gases, can cause discomfort or harm,
particularly in confined spaces. Do
not breathe fumes and gases. Shielding gases can cause asphyxiation.
Therefore:
9. Turn off the power before removing your gloves.
10. Refer to ANSI/ASC Standard Z49.1 (listed on
next page) for specific grounding recommendations. Do not mistake the work lead for a ground
cable.
ELECTRIC AND MAGNETIC FIELDS
— May be dangerous. Electric current flowing through any conductor causes localized Electric and
Magnetic Fields (EMF). Welding and
cutting current creates EMF around welding cables
and welding machines. Therefore:
1. Welders having pacemakers should consult their
physician before welding. EMF may interfere with
some pacemakers.
2. Exposure to EMF may have other health effects which
are unknown.
1. Always provide adequate ventilation in the work area
by natural or mechanical means. Do not weld, cut, or
gouge on materials such as galvanized steel, stainless steel, copper, zinc, lead, beryllium, or cadmium
unless positive mechanical ventilation is provided.
Do not breathe fumes from these materials.
2. Do not operate near degreasing and spraying operations. The heat or arc rays can react with chlorinated
hydrocarbon vapors to form phosgene, a highly
toxic gas, and other irritant gases.
3. If you develop momentary eye, nose, or throat irritation while operating, this is an indication that
ventilation is not adequate. Stop work and take
necessary steps to improve ventilation in the work
area. Do not continue to operate if physical discomfort persists.
4. Refer to ANSI/ASC Standard Z49.1 (see listing below)
for specific ventilation recommendations.
6
SECTION 1 SAFETY PRECAUTIONS
5. WARNING: This product, when used for welding
or cutting, produces fumes or gases
which contain chemicals known to
the State of California to cause birth
defects and, in some cases, cancer.
(California Health & Safety Code
§25249.5 et seq.)
CYLINDER HANDLING -- Cylinders,
if mishandled, can rupture and violently release gas. Sudden rupture
of cylinder, valve, or relief device can
injure or kill. Therefore:
1. Use the proper gas for the process and use the
proper pressure reducing regulator designed to
operate from the compressed gas cylinder. Do not
use adaptors. Maintain hoses and fittings in good
condition. Follow manufacturer's operating instructions for mounting regulator to a compressed gas
cylinder.
1. Always have qualified personnel perform the instal
lation, troubleshooting, and maintenance work.
Do not perform any electrical work unless you are
qualified to perform such work.
2. Before performing any maintenance work inside a
power source, disconnect the power source from
the incoming electrical power.
3. Maintain cables, grounding wire, connections, power
cord, and power supply in safe working order. Do
not operate any equipment in faulty condition.
4. Do not abuse any equipment or accessories. Keep
equipment away from heat sources such as furnaces,
wet conditions such as water puddles, oil or grease,
corrosive atmospheres and inclement weather.
5. Keep all safety devices and cabinet covers in position
and in good repair.
6. Use equipment only for its intended purpose. Do
not modify it in any manner.
-
2. Always secure cylinders in an upright position by
chain or strap to suitable hand trucks, undercarriages, benches, walls, post, or racks. Never secure
cylinders to work tables or fixtures where they may
become part of an electrical circuit.
3. When not in use, keep cylinder valves closed. Have
valve protection cap in place if regulator is not connected. Secure and move cylinders by using suitable
hand trucks. Avoid rough handling of cylinders.
4. Locate cylinders away from heat, sparks, and flames.
Never strike an arc on a cylinder.
5. For additional information, refer to CGA Standard P-1,
"Precautions for Safe Handling of Compressed Gases
in Cylinders", which is available from Compressed
Gas Association, 1235 Jefferson Davis Highway,
Arlington, VA 22202.
EQUIPMENT MAINTENANCE -- Faulty or
improperly maintained equipment can
cause injury or death. Therefore:
ADDITIONAL SAFETY INFORMATION -- For
more information on safe practices for
electric arc welding and cutting equipment, ask your supplier for a copy of
"Precautions and Safe Practices for Arc
Welding, Cutting and Gouging", Form
52-529.
The following publications, which are available from
the American Welding Society, 550 N.W. LeJuene Road,
Miami, FL 33126, are recommended to you:
1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"
2. AWS C5.1 - "Recommended Practices for Plasma Arc
Welding"
3. AWS C5.2 - "Recommended Practices for Plasma Arc
Cutting"
4. AWS C5.3 - "Recommended Practices for Air Carbon
Arc Gouging and Cutting"
7
SECTION 1 SAFETY PRECAUTIONS
5. AWS C5.5 - "Recommended Practices for Gas Tungsten Arc Welding“
6. AWS C5.6 - "Recommended Practices for Gas Metal
Arc Welding"“
7. AWS SP - "Safe Practices" - Reprint, Welding Handbook.
8. ANSI/AWS F4.1, "Recommended Safe Practices for
Welding and Cutting of Containers That Have Held
Hazardous Substances."
MEANING OF SYMBOLS - As used
throughout this manual: Means Attention! Be Alert! Your safety is involved.
Means immediate hazards which,
if not avoided, will result in immediate, serious personal injury
or loss of life.
Means potential hazards which
could result in personal injury or
loss of life.
Means hazards which could result
in minor personal injury.
8
SECTION 1 SEGURIDAD
1.2 Safety - Spanish
ADVERTENCIA: Estas Precauciones de Se-
guridad son para su protección. Ellas hacen
resumen de información proveniente de las
referencias listadas en la sección "Información Adicional Sobre La Seguridad". Antes de hacer cualquier
instalación o procedimiento de operación , asegúrese
de leer y seguir las precauciones de seguridad listadas
a continuación así como también todo manual, hoja
de datos de seguridad del material, calcomanias, etc.
El no observar las Precauciones de Seguridad puede
resultar en daño a la persona o muerte.
PROTEJASE USTED Y A LOS DEMAS-Algunos procesos de soldadura, corte
y ranurado son ruidosos y requiren
protección para los oídos. El arco,
como el sol , emite rayos ultravioleta
(UV) y otras radiaciones que pueden dañar la piel
y los ojos. El metal caliente causa quemaduras. EL
entrenamiento en el uso propio de los equipos y
sus procesos es esencial para prevenir accidentes.
Por lo tanto:
1. Utilice gafas de seguridad con protección a los lados
siempre que esté en el área de trabajo, aún cuando
esté usando careta de soldar, protector para su cara
u otro tipo de protección.
2. Use una careta que tenga el filtro correcto y lente
para proteger sus ojos, cara, cuello, y oídos de las
chispas y rayos del arco cuando se esté operando y
observando las operaciones. Alerte a todas las personas cercanas de no mirar el arco y no exponerse
a los rayos del arco eléctrico o el metal fundido.
3. Use guantes de cuero a prueba de fuego, camisa
pesada de mangas largas, pantalón de ruedo liso,
zapato alto al tobillo, y careta de soldar con capucha
para el pelo, para proteger el cuerpo de los rayos y
chispas calientes provenientes del metal fundido.
En ocaciones un delantal a prueba de fuego es
necesario para protegerse del calor radiado y las
chispas.
4. Chispas y partículas de metal caliente puede alojarse
en las mangas enrolladas de la camisa , el ruedo del
pantalón o los bolsillos. Mangas y cuellos deberán
mantenerse abotonados, bolsillos al frente de la
camisa deberán ser cerrados o eliminados.
5. Proteja a otras personas de los rayos del arco y chis
pas calientes con una cortina adecuada no-flamable
como división.
6. Use careta protectora además de sus gafas de segu
ridad cuando esté removiendo escoria o puliendo.
La escoria puede estar caliente y desprenderse con
velocidad. Personas cercanas deberán usar gafas
de seguridad y careta protectora.
FUEGO Y EXPLOSIONES -las flamas y el arco pueden ocacionar
fuegos. Escoria caliente y las chispas
pueden causar fuegos y explosiones.
Por lo tanto:
1. Remueva todo material combustible lejos del área
de trabajo o cubra los materiales con una cobija a
prueba de fuego. Materiales combustibles incluyen
madera, ropa, líquidos y gases flamables, solventes,
pinturas, papel, etc.
2. Chispas y partículas de metal pueden introducirse en
las grietas y agujeros de pisos y paredes causando
fuegos escondidos en otros niveles o espacios.
Asegúrese de que toda grieta y agujero esté cubierto
para proteger lugares adyacentes contra fuegos.
3. No corte, suelde o haga cualquier otro trabajo
relacionado hasta que la pieza de trabajo esté totalmente limpia y libre de substancias que puedan
producir gases inflamables o vapores tóxicos. No
trabaje dentro o fuera de contenedores o tanques
cerrados. Estos pueden explotar si contienen vapores
inflamables.
4. Tenga siempre a la mano equipo extintor de fuego
para uso instantáneo, como por ejemplo una
manguera con agua, cubeta con agua, cubeta con
arena, o extintor portátil. Asegúrese que usted esta
entrenado para su uso.
5. No use el equipo fuera de su rango de operación. Por
ejemplo, el calor causado por cable sobrecarga en
los cables de soldar pueden ocasionar un fuego.
6. Después de termirar la operación del equipo, inspec
cione el área de trabajo para cerciorarse de que las
chispas o metal caliente ocasionen un fuego más
tarde. Tenga personal asignado para vigilar si es
necesario.
7. Para información adicional , haga referencia a la
publicación NFPA Standard 51B, "Fire Prevention in
Use of Cutting and Welding Processes", disponible
a través de la National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
CHOQUE ELECTRICO -- El contacto
con las partes eléctricas energizadas
-
-
de movimiento confinado en lugares estrechos o
si hay posibilidad de caer al suelo.
9
y tierra puede causar daño severo o
muerte. NO use soldadura de corri
ente alterna (AC) en áreas húmedas,
El calor de
-
-
SECTION 1 SEGURIDAD
1. Asegúrese de que el chasis de la fuente de poder
esté conectado a tierra através del sistema de
electricidad primario.
2. Conecte la pieza de trabajo a un buen sistema de
tierra física.
3. Conecte el cable de retorno a la pieza de trabajo.
Cables y conductores expuestos o con malas
conexiones pueden exponer al operador u otras
personas a un choque eléctrico fatal.
4. Use el equipo solamente si está en buenas condi
ciones. Reemplaze cables rotos, dañados o con
conductores expuestos.
5. Mantenga todo seco, incluyendo su ropa, el área de
trabajo, los cables, antorchas, pinza del electrodo,
y la fuente de poder.
6. Asegúrese que todas las partes de su cuerpo están
insuladas de ambos, la pieza de trabajo y tierra.
7. No se pare directamente sobre metal o tierra mientras trabaja en lugares estrechos o áreas húmedas;
trabaje sobre un pedazo de madera seco o una
plataforma insulada y use zapatos con suela de
goma.
8. Use guantes secos y sin agujeros antes de energizar
el equipo.
9. Apage el equipo antes de quitarse sus guantes.
10. Use como referencia la publicación ANSI/ASC
Standard Z49.1 (listado en la próxima página) para
recomendaciones específicas de como conectar el
equipo a tierra. No confunda el cable de soldar a
la pieza de trabajo con el cable a tierra.
CAMPOS ELECTRICOS Y MAGNETICOS - Son peligrosos. La corriente
eléctrica fluye através de cualquier
conductor causando a nivel local
Campos Eléctricos y Magnéticos
(EMF). Las corrientes en el área de corte y soldadura,
crean EMF alrrededor de los cables de soldar y las
maquinas. Por lo tanto:
1. Soldadores u Operadores que use marca-pasos para
el corazón deberán consultar a su médico antes de
soldar. El Campo Electromagnético (EMF) puede
interferir con algunos marca-pasos.
2. Exponerse a campos electromagnéticos (EMF) puede
causar otros efectos de salud aún desconocidos.
3. Los soldadores deberán usar los siguientes proced
imientos para minimizar exponerse al EMF:
A. Mantenga el electrodo y el cable a la pieza de
trabajo juntos, hasta llegar a la pieza que usted
quiere soldar. Asegúrelos uno junto al otro con
cinta adhesiva cuando sea posible.
B. Nunca envuelva los cables de soldar alrededor
de su cuerpo.
-
C. Nunca ubique su cuerpo entre la antorcha y el
cable, a la pieza de trabajo. Mantega los cables a
un sólo lado de su cuerpo.
D. Conecte el cable de trabajo a la pieza de trabajo
lo más cercano posible al área de la soldadura.
E. Mantenga la fuente de poder y los cables de soldar
lo más lejos posible de su cuerpo.
HUMO Y GASES -- El humo y los
gases, pueden causar malestar o
daño, particularmente en espacios
sin ventilación. No inhale el humo
o gases. El gas de protección puede
causar falta de oxígeno.
Por lo tanto:
1. Siempre provea ventilación adecuada en el área
de trabajo por medio natural o mecánico. No solde,
corte, o ranure materiales con hierro galvanizado,
acero inoxidable, cobre, zinc, plomo, berílio, o cadmio a menos que provea ventilación mecánica
positiva . No respire los gases producidos por
estos materiales.
2. No opere cerca de lugares donde se aplique sub-
stancias químicas en aerosol. El calor de los rayos
del arco pueden reaccionar con los vapores de
hidrocarburo clorinado para formar un fosfógeno,
o gas tóxico, y otros irritant es.
3. Si momentáneamente desarrolla inrritación de
ojos, nariz o garganta mientras est á operando, es
indicación de que la ventilación no es apropiada.
Pare de trabajar y tome las medidas necesarias
para mejorar la ventilación en el área de trabajo.
No continúe operando si el malestar físico persiste.
4. Haga referencia a la publicación ANSI/ASC Standard
Z49.1 (Vea la lista a continuación) para recomendaciones específicas en la ventilación.
-
10
SECTION 1 SEGURIDAD
5. ADVERTENCIA-- Este producto cuando se utiliza para soldaduras o cortes,
produce humos o gases, los
cuales contienen químicos
conocidos por el Estado de California de causar defectos en el
nacimiento, o en algunos casos,
Cancer. (California Health &
Safety Code §25249.5 et seq.)
MANEJO DE CILINDROS-- Los
cilindros, si no son manejados
correctamente, pueden romperse y liberar violentamente
gases. Rotura repentina del
cilindro, válvula, o válvula de
escape puede causar daño o
muerte. Por lo tanto:
1. Utilize el gas apropiado para el proceso y utilize
un regulador diseñado para operar y reducir la
presión del cilindro de gas . No utilice adaptadores. Mantenga las mangueras y las conexiones
en buenas condiciones. Observe las instrucciones
de operación del manufacturero para montar el
regulador en el cilindro de gas comprimido.
2. Asegure siempre los cilindros en posición vertical
y amárrelos con una correa o cadena adecuada
para asegurar el cilindro al carro, transportes, tablilleros, paredes, postes, o armazón. Nunca asegure
los cilindros a la mesa de trabajo o las piezas que
son parte del circuito de soldadura . Este puede ser
parte del circuito elélectrico.
3. Cuando el cilindro no está en uso, mantenga la
válvula del cilindro cerrada. Ponga el capote de
protección sobre la válvula si el regulador no
está conectado. Asegure y mueva los cilindros
utilizando un carro o transporte adecuado. Evite
el manejo brusco de los
1. Siempre tenga personal cualificado para efec
tuar l a instalación, diagnóstico, y mantenimiento
del equipo. No ejecute ningún trabajo eléctrico a
menos que usted esté cualificado para hacer el
trabajo.
2. Antes de dar mantenimiento en el interior de la
fuente de poder, desconecte la fuente de poder
del suministro de electricidad primaria.
3. Mantenga los cables, cable a tierra, conexciones,
cable primario, y cualquier otra fuente de poder
en buen estado operacional. No opere ningún
equipo en malas condiciones.
4. No abuse del equipo y sus accesorios. Mantenga
el equipo lejos de cosas que generen calor como
hornos, también lugares húmedos como charcos
de agua , aceite o grasa, atmósferas corrosivas y
las inclemencias del tiempo.
5. Mantenga todos los artículos de seguridad y
coverturas del equipo en su posición y en buenas
condiciones.
6. Use el equipo sólo para el propósito que fue
diseñado. No modifique el equipo en ninguna
manera.
INFORMACION ADICIONAL DE SEGURIDAD -- Para más información sobre las
prácticas de seguridad de los equipos de
arco eléctrico para soldar y cortar, pregunte
a su suplidor por una copia de "Precautions
and Safe Practices for Arc Welding, Cutting
and Gouging-Form 52-529.
Las siguientes publicaciones, disponibles através de
la American Welding Society, 550 N.W. LeJuene Road,
Miami, FL 33126, son recomendadas para usted:
1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"
2. AWS C5.1 - "Recommended Practices for Plasma Arc
Welding"
-
MANTENIMIENTO DEL EQUIPO -- Equipo
defectuoso o mal mantenido puede causar daño o muerte. Por lo tanto:
3. AWS C5.2 - "Recommended Practices for Plasma Arc
Cutting"
4. AWS C5.3 - "Recommended Practices for Air Carbon
Arc Gouging and Cutting"
11
SECTION 1 SEGURIDAD
SIGNIFICADO DE LOS SIMBOLOS
-- Según usted avanza en la lectura
de este folleto: Los Símbolos Sig
nifican ¡Atención! ¡Esté Alerta! Se
trata de su seguridad.
Significa riesgo inmediato que,
de no ser evadido, puede resultar
inmediatamente en serio daño
personal o la muerte.
Significa el riesgo de un peligro
potencial que puede resultar en
serio daño personal o la muerte.
Significa el posible riesgo que
puede resultar en menores daños
a la persona.
-
12
SECTION 1 SÉCURITÉ
1.3 Safety - French
AVERTISSEMENT :
ont pour but d'assurer votre protection. Ils
récapitulent les informations de précaution
provenant des références dans la section
des Informations de sécurité supplémentaires. Avant de
procéder à l'installation ou d'utiliser l'unité, assurez-vous
de lire et de suivre les précautions de sécurité ci-dessous, dans les manuels, les fiches d'information sur la
sécurité du matériel et sur les étiquettes, etc. Tout défaut
d'observer ces précautions de sécurité peut entraîner
des blessures graves ou mortelles.
PROTÉGEZ-VOUS -- Les processus de
soudage, de coupage et de gougeage
produisent un niveau de bruit élevé et
exige l'emploi d'une protection auditive. L'arc, tout
comme le soleil, émet des rayons ultraviolets en plus
d'autre rayons qui peuvent causer des blessures à la
peau et les yeux. Le métal incandescent peut causer
des brûlures. Une formation reliée à l'usage des
processus et de l'équipement est essentielle pour
prévenir les accidents. Par conséquent:
1. Portez des lunettes protectrices munies d'écrans la-
téraux lorsque vous êtes dans l'aire de travail, même
si vous devez porter un casque de soudeur, un écran
facial ou des lunettes étanches.
2. Portez un écran facial muni de verres filtrants et de
plaques protectrices appropriées afin de protéger
vos yeux, votre visage, votre cou et vos oreilles des
étincelles et des rayons de l'arc lors d'une opération
ou lorsque vous observez une opération. Avertissez
les personnes se trouvant à proximité de ne pas regarder l'arc et de ne pas s'exposer aux rayons de l'arc
électrique ou le métal incandescent.
3. Portez des gants ignifugiés à crispin, une chemise
épaisse à manches longues, des pantalons sans
rebord et des chaussures montantes afin de vous
protéger des rayons de l'arc, des étincelles et du métal
incandescent, en plus d'un casque de soudeur ou
casquette pour protéger vos cheveux. Il est également
recommandé de porter un tablier ininflammable afin
de vous protéger des étincelles et de la chaleur par
rayonnement.
4. Les étincelles et les projections de métal incandescent
risquent de se loger dans les manches retroussées,
les rebords de pantalons ou les poches. Il est recommandé de garder boutonnés le col et les manches et
de porter des vêtements sans poches en avant.
5. Protégez toute personne se trouvant à proximité des
étincelles et des rayons de l'arc à l'aide d'un rideau ou
d'une cloison ininflammable.
6. Portez des lunettes étanches par dessus vos lunettes
de sécurité lors des opérations d'écaillage ou de
meulage du laitier. Les écailles de laitier incandescent
peuvent être projetées à des distances considérables.
Les personnes se trouvant à proximité doivent également porter des lunettes étanches par dessus leur
lunettes de sécurité.
Ces règles de sécurité
INCENDIES ET EXPLOSIONS -- La
chaleur provenant des flammes ou de
l'arc peut provoquer un incendie. Le
laitier incandescent ou les étincelles
peuvent également provoquer un
incendie ou une explosion. Par conséquent :
1. Éloignez suffisamment tous les matériaux combus
tibles de l'aire de travail et recouvrez les matériaux
avec un revêtement protecteur ininflammable. Les
matériaux combustibles incluent le bois, les vêtements, la sciure, le gaz et les liquides combustibles,
les solvants, les peintures et les revêtements, le
papier, etc.
2. Les étincelles et les projections de métal incan
descent peuvent tomber dans les fissures dans
les planchers ou dans les ouvertures des murs et
déclencher un incendie couvant à l'étage inférieur
Assurez-vous que ces ouvertures sont bien protégées
des étincelles et du métal incandescent.
3. N'exécutez pas de soudure, de coupe ou autre tra
vail à chaud avant d'avoir complètement nettoyé la
surface de la pièce à traiter de façon à ce qu'il n'ait
aucune substance présente qui pourrait produire
des vapeurs inflammables ou toxiques. N'exécutez
pas de travail à chaud sur des contenants fermés
car ces derniers pourraient exploser.
4. Assurez-vous qu'un équipement d'extinction
d'incendie est disponible et prêt à servir, tel qu'un
tuyau d'arrosage, un seau d'eau, un seau de sable
ou un extincteur portatif. Assurez-vous d'être bien
instruit par rapport à l'usage de cet équipement.
5. Assurez-vous de ne pas excéder la capacité de
l'équipement. Par exemple, un câble de soudage
surchargé peut surchauffer et provoquer un incendie.
6. Une fois les opérations terminées, inspectez l'aire de
travail pour assurer qu'aucune étincelle ou projection de métal incandescent ne risque de provoquer
un incendie ultérieurement. Employez des guetteurs
d'incendie au besoin.
7. Pour obtenir des informations supplémentaires,
consultez le NFPA Standard 51B, "Fire Prevention in
Use of Cutting and Welding Processes", disponible au
National Fire Protection Association, Batterymarch
Park, Quincy, MA 02269.
CHOC ÉLECTRIQUE -- Le contact avec
des pièces électriques ou les pièces
de mise à la terre sous tension peut
causer des blessures graves ou mor-
telles. NE PAS utiliser un courant de
soudage c.a. dans un endroit humide, en espace
restreint ou si un danger de chute se pose.
13
-
-
-
SECTION 1 SÉCURITÉ
1. Assurez-vous que le châssis de la source
d'alimentation est branché au système de mise à
la terre de l'alimentation d'entrée.
2. Branchez la pièce à traiter à une bonne mise de
terre électrique.
3. Branchez le câble de masse à la pièce à traiter et
assurez une bonne connexion afin d'éviter le risque
de choc électrique mortel.
4. Utilisez toujours un équipement correctement
entretenu. Remplacez les câbles usés ou endommagés.
5. Veillez à garder votre environnement sec, incluant
les vêtements, l'aire de travail, les câbles, le porteélectrode/torche et la source d'alimentation.
6. Assurez-vous que tout votre corps est bien isolé
de la pièce à traiter et des pièces de la mise à la
terre.
7. Si vous devez effectuer votre travail dans un espace
restreint ou humide, ne tenez vous pas directement sur le métal ou sur la terre; tenez-vous sur
des planches sèches ou une plate-forme isolée et
portez des chaussures à semelles de caoutchouc.
8. Avant de mettre l'équipement sous tension, isolez
vos mains avec des gants secs et sans trous.
9. Mettez l'équipement hors tension avant d'enlever
vos gants.
10. Consultez ANSI/ASC Standard Z49.1 (listé à
la page suivante) pour des recommandations
spécifiques concernant les procédures de mise à
la terre. Ne pas confondre le câble de masse avec
le câble de mise à la terre.
CHAMPS ÉLECTRIQUES ET MAGNÉTIQUES — comportent un risque
de danger. Le courant électrique
qui passe dans n'importe quel con-
ducteur produit des champs électriques et magnétiques localisés. Le soudage et le
courant de coupage créent des champs électriques
et magnétiques autour des câbles de soudage et
l'équipement. Par conséquent :
1. Un soudeur ayant un stimulateur cardiaque doit
consulter son médecin avant d'entreprendre une
opération de soudage. Les champs électriques et
magnétiques peuvent causer des ennuis pour certains stimulateurs cardiaques.
2. L'exposition à des champs électriques et magné-
tiques peut avoir des effets néfastes inconnus pour
la santé.
3. Les soudeurs doivent suivre les procédures suivantes
pour minimiser l'exposition aux champs électriques
et magnétiques :
A. Acheminez l'électrode et les câbles de masse
ensemble. Fixez-les à l'aide d'une bande adhésive
lorsque possible.
B. Ne jamais enrouler la torche ou le câble de masse
autour de votre corps.
C. Ne jamais vous placer entre la torche et les câbles
de masse. Acheminez tous les câbles sur le même
côté de votre corps.
D. Branchez le câble de masse à la pièce à traiter le
plus près possible de la section à souder.
E. Veillez à garder la source d'alimentation pour le
soudage et les câbles à une distance appropriée
de votre corps.
LES VAPEURS ET LES GAZ -- peuvent
causer un malaise ou des dommages
corporels, plus particulièrement
dans les espaces restreints. Ne respirez pas les vapeurs et les gaz. Le
gaz de protection risque de causer
l'asphyxie. Par conséquent :
1. Assurez en permanence une ventilation adéquate
dans l'aire de travail en maintenant une ventilation naturelle ou à l'aide de moyens mécanique.
N'effectuez jamais de travaux de soudage, de coupage ou de gougeage sur des matériaux tels que
l'acier galvanisé, l'acier inoxydable, le cuivre, le zinc,
le plomb, le berylliym ou le cadmium en l'absence
de moyens mécaniques de ventilation efficaces. Ne
respirez pas les vapeurs de ces matériaux.
2. N'effectuez jamais de travaux à proximité d'une
opération de dégraissage ou de pulvérisation.
Lorsque la chaleur
ou le rayonnement de l'arc entre en contact avec les
vapeurs d'hydrocarbure chloré, ceci peut déclencher
la formation de phosgène ou d'autres gaz irritants,
tous extrêmement toxiques.
3. Une irritation momentanée des yeux, du nez ou de la
gorge au cours d'une opération indique que la ventilation n'est pas adéquate. Cessez votre travail afin
de prendre les mesures nécessaires pour améliorer
la ventilation dans l'aire de travail. Ne poursuivez
pas l'opération si le malaise persiste.
4. Consultez ANSI/ASC Standard Z49.1 (à la page
suivante) pour des recommandations spécifiques
concernant la ventilation.
14
SECTION 1 SÉCURITÉ
5. AVERTISSEMENT : Ce produit, lorsqu'il est utilisé
dans une opération de soudage ou de
coupage, dégage des vapeurs ou des
gaz contenant des chimiques considéres par l'état de la Californie comme
étant une cause des malformations
congénitales et dans certains cas, du
cancer. (California Health & Safety
Code §25249.5 et seq.)
MANIPULATION DES CYLINDRES --
La manipulation d'un cylindre, sans
observer les précautions nécessaires,
peut produire des fissures et un
échappement dangereux des gaz.
Une brisure soudaine du cylindre, de la soupape ou
du dispositif de surpression peut causer des blessures graves ou mortelles. Par conséquent :
1. Utilisez toujours le gaz prévu pour une opération
et le détendeur approprié conçu pour utilisation
sur les cylindres de gaz comprimé. N'utilisez jamais
d'adaptateur. Maintenez en bon état les tuyaux et
les raccords. Observez les instructions d'opération
du fabricant pour assembler le détendeur sur un
cylindre de gaz comprimé.
2. Fixez les cylindres dans une position verticale, à
l'aide d'une chaîne ou une sangle, sur un chariot
manuel, un châssis de roulement, un banc, un mur,
une colonne ou un support convenable. Ne fixez
jamais un cylindre à un poste de travail ou toute autre
dispositif faisant partie d'un circuit électrique.
3. Lorsque les cylindres ne servent pas, gardez les
soupapes fermées. Si le détendeur n'est pas branché, assurez-vous que le bouchon de protection de
la soupape est bien en place. Fixez et déplacez les
cylindres à l'aide d'un chariot manuel approprié.
Toujours manipuler les cylindres avec soin.
4. Placez les cylindres à une distance appropriée
de toute source de chaleur, des étincelles et des
flammes. Ne jamais amorcer l'arc sur un cylindre.
5. Pour de l'information supplémentaire, consultez
CGA Standard P-1, "Precautions for Safe Handling
of Compressed Gases in Cylinders", mis à votre disposition par le Compressed Gas Association, 1235
Jefferson Davis Highway, Arlington, VA 22202.
ENTRETIEN DE L'ÉQUIPEMENT -- Un équipement entretenu de façon défectueuse ou
inadéquate peut causer des blessures
graves ou mortelles. Par conséquent :
1. Efforcez-vous de toujours confier les tâches
d'installation, de dépannage et d'entretien à un
personnel qualifié. N'effectuez aucune réparation
électrique à moins d'être qualifié à cet effet.
2. Avant de procéder à une tâche d'entretien à
l'intérieur de la source d'alimentation, débranchez
l'alimentation électrique.
3. Maintenez les câbles, les fils de mise à la terre, les
branchements, le cordon d'alimentation et la source
d'alimentation en bon état. N'utilisez jamais un
équipement s'il présente une défectuosité quelconque.
4. N'utilisez pas l'équipement de façon abusive. Gardez
l'équipement à l'écart de toute source de chaleur,
notamment des fours, de l'humidité, des flaques
d'eau, de l'huile ou de la graisse, des atmosphères
corrosives et des intempéries.
5. Laissez en place tous les dispositifs de sécurité et
tous les panneaux de la console et maintenez-les
en bon état.
6. Utilisez l'équipement conformément à son usage
prévu et n'effectuez aucune modification.
INFORMATIONS SUPPLÉMENTAIRES RELATIVES À LA SÉCURITÉ -- Pour obtenir de
l'information supplémentaire sur les règles
de sécurité à observer pour l'équipement
de soudage à l'arc électrique et le coupage,
demandez un exemplaire du livret "Precautions and Safe Practices for Arc Welding,
Cutting and Gouging", Form 52-529.
Les publications suivantes sont également recommandées et mises à votre disposition par l'American Welding
Society, 550 N.W. LeJuene Road, Miami, FL 33126 :
1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"
2. AWS C5.1 - "Recommended Practices for Plasma Arc
Welding"
3. AWS C5.2 - "Recommended Practices for Plasma Arc
Cutting"
4. AWS C5.3 - "Recommended Practices for Air Carbon
Arc Gouging and Cutting"
15
SECTION 1 SÉCURITÉ
SIGNIFICATION DES SYMBOLES
Ce symbole, utilisé partout dans ce manuel,
signifie "Attention" ! Soyez vigilant ! Votre
sécurité est en jeu.
DANGER
Signifie un danger immédiat. La situation peut
entraîner des blessures graves ou mortelles.
AVERTISSEMENT
Signifie un danger potentiel qui peut entraîner des
blessures graves ou mortelles.
ATTENTION
Signifie un danger qui peut entraîner des blessures
corporelles mineures.
16
SECTION 2 DESCRIPTION
2.1 GENERAL
The Prest-O-Lite® 550 is a compact, completely self-contained plasma cutting system. As shipped, the system is
fully assembled and ready to cut after being connected
to input power and a source of prefiltered compressed
air (90-150 psi). The Prest-O-Lite® 550 package uses the
PT-31XL torch to deliver cutting power for materials up
to 1/2 inch thick or for severing up to 5/8 inch thick. Refer
to the following paragraphs for descriptions of the PrestO-Lite® 550 packages available as well as performance
specifications.
Do not use any torch with this power source other than the Prest-O-Lite brand PT-31XL torch. Serious injury
may occur if used with any other torch.
2.2 SCOPE
The purpose of this manual is to provide the operator
with all the information required to install and operate
the Prest-O-Lite® 550 Plasma Cutter. Technical reference
material is also provided to assist in troubleshooting
the Cutter.
2.3 PACKAGE AVAILABLE
Prest-O-Lite® 550 Plasma Cutter .......................................................................................................................................P/N 0558006058
includes:
Console with Regulator and Work Cable
Torch
Spare Parts Kit
Table 2-1. PT-31XL Spare Parts Kit Contents
Description Part Number Quantity
Spare Parts Kit P/N 0558006147 includes:
30/40 A Nozzle 0558006187 3
Electrode 0558006190 2
Swirl Baffle 0558006189 1
Heat Shield 0558006185 1
17
SECTION 2 DESCRIPTION
2.4 SPECIFICATIONS
Refer to Tables 2-2, 2-3, and Figures 2-1 and 2-2 for Prest-O-Lite
Table 2-2. Prest-O-Lite
Rated
Output
40% Duty Cycle* 35 A @ 120 V dc
60% Duty Cycle* 30 A @ 120 V dc
100% Duty Cycle* 22 A @ 120 V dc
Output Current Range 15 to 35 Amperes
Open Circuit Voltage 230 V dc Nominal
Rated Primary Input
@
230 VAC, 50/60 Hz,
1-Phase
35 A @ 120 VDC Output
Power Factor @
35 Amperes Output
Current Capacity PT-31XL 50 A DCSP
Air Requirements PT-31XL 250 cfh @ 80 psi
Dimensions of Handy
Plasma
®
550
Length
Height
Width
Weight (less torch) 35 lbs (16 kg)
®
550 technical specifications.
®
550 Specifications
27 A
81% (1-Phase)
14.25-in. ( 362 mm)
12.7-in. (322 mm)
6.2-in. (156 mm)
* Duty cycle is based on a 10-minute period; therefore, a 40% duty cycle means the machine may operate for 4 minutes with a cool
down period of 6 minutes; a 60% duty cycle means the machine may operate for 6 minutes with a cool down period of 4 minutes; a
100% duty cycle means the machine may operate continuously.
18
SECTION 2 DESCRIPTION
Table 2-3. PT-31XL Torch Specifications
PT-31XL Torch
Current Capacity ...........................................................50A DCSP
Shipping Wgt. ..............................................................2 lbs (1 kg)
Length of Service Lines ........................................ 25-ft. (7.6 m)
2 1/4"
(57mm)
75° Torch
5 1/4"
(133mm)
Figure 2-1. PT-31XL Dimensions
Figure 2-2. PT-31XL Cutting Performance
19
SECTION 2 DESCRIPTION
20
SECTION 3 INSTALLATION
3.1 GENERAL
Proper installation can contribute materially to the satisfactory and trouble-free operation of the Prest-O-Lite® 550
Cutter. It is suggested that each step in this section be
studied carefully and followed as closely as possible.
3.2 EQUIPMENT REQUIRED
A source of clean, prefiltered dry air that supplies 250 cfh
at 80 psig is required for the cutting operation. The air
supply should not exceed 150 psig (the maximum inlet
pressure rating of the air filter-regulator supplied with the
package).
3.3 LOCATION
Adequate ventilation is necessary to provide proper cooling of the Prest-O-Lite® 550 and the amount of dirt, dust,
and excessive heat to which the equipment is exposed,
should be minimized. There should be at least one foot
of clearance between the Prest-O-Lite® 550 power source
and wall or any other obstruction to allow freedom of air
movement through the power source.
Installing or placing any type of filtering device will restrict
the volume of intake air, thereby subjecting the power
source internal components to overheating. The warranty
is void if any type of filter device is used.
3.5 PRIMARY ELECTRICAL INPUT
CONNECTIONS FIGURE 31
ELECTRIC SHOCK CAN KILL! Precautionary measures
should be taken to provide maximum protection
against electrical shock. Be sure that all power is off
by opening the line (wall) disconnect switch and by
unplugging the power cord to the unit when connections are made inside of the power source.
Be sure that the power source is properly configured
for your input power supply. Damage to the machine
may occur otherwise.
The Prest-O-Lite® 550 power source operating on 230 V,
1-phase input power is equipped with a 8-ft, 3-conductor
cable with plug. An optional mating receptacle (P/N 674540)
is available. A line (wall) disconnect switch with a 40-ampere
fuse or circuit breaker should be provided at the main power
panel. The cable connecting the disconnect switch to the
receptacle should include three (two power and one ground)
No. 10 AWG insulated conductors.
3.4 INSPECTION
A. Remove the shipping container and all packing ma-
terial and inspect for evidence of concealed damage
which may not have been apparent upon receipt of
the Prest-O-Lite® 550. Notify the carrier of any defects
or damage at once.
B. Check container for any loose parts prior to disposing
of shipping materials.
C. Check air louvers and any other openings to ensure
that any obstruction is removed.
The chassis must be connected to an approved electrical
ground. Failure to do so may result in electrical shock,
severe burns or death.
A line (wall) disconnect switch, with proper sized fuse or
circuit breaker (see Table 3.1), should be provided at the
main power panel.
21
SECTION 3 INSTALLATION
3.6 SECONDARY OUTPUT CONNECTIONS
REFER TO FIG. 31
Torch comes factory installed. These instructions are
for torch replacement.
Before making any connections to the power source
output terminals, make sure that all primary input
power to the power source is deenergized (off) at
the main disconnect switch and that the input power
cable is unplugged. For operator safety, the torch
connections are loaded.
Table 3-1. Recommended Sizes for Input Conductors and Line Fuses
1. The torch connections are located at the flowswitch
on upper left side of machine.
2. Thread the power cable and switch lead of the PT31XL through the right side (above pressure gauge)
bushing of the front panel. Connect power cable to
the torch fitting (left-hand threads) and connect torch
switch leads to pins 1 and 2 of M2 located in the upper right hand corner of machine (viewing from rear
of machine) of the control P.C. Board. Make sure the
power cable connection is wrench-tight.
3. Replace the machine cover panel.
4. Connect your air supply to the inlet connection of
the filter-regulator.
5. Clamp the work cable to the workpiece. Be sure the
workpiece is connected to an approved earth ground
with a properly sized ground cable.
Rated Input Input & GND Fuse Size
Conductor Amps
Volts Amp Phases CU/AWG*
230 27 1 No. 10 40
* Sized per National Code for 80°C rated copper conductors @ 30°C ambient. Not more than three conductors in
raceway or cable. Local codes should be followed if they specify sizes other than those listed above.
22
SECTION 3 INSTALLATION
3.7 CONNECTING PRESTOLITE® 550 FOR 230 Vac INPUT
550 PLASMA CUTTER
PT-31XL
WORK CABLE
WORK
SAFETY
GROUND
Allow at least 10 ft (3 m)
between work and power source
Prefiltered AIR SUPPLY (Customer Supplied)
(90 to 150 psig max)
CUSTOMER FUSED LINE
DISCONNECT SWITCH
*
See Table 3-1
RECEPTACLE (P/N 674540)
(Optional for 230 V, 1-phase power sources)
PLUG
Figure 3-1. Prest-O-Lite® 550 Interconnection Diagram
23
(See Table 3-1 and WARNING
*
in regards to chassis ground
in Section 3.5.)
SECTION 3 INSTALLATION
EARTH GROUND
DO NOT ATTACH WORK CABLE
WORK CABLE
TO PIECE BEING CUT FREE
EARTH GROUND
GROUNDED
WORK TABLE
BE SURE WORK IS IN GOOD
CONTACT WITH TABLE.
24
WORK CABLE
SECTION 4 OPERATION
4.1 OPERATION
ELECTRIC SHOCK can kill.
• Do NOT operate the unit with the cover removed.
• Do NOT apply power to the unit while holding or
carrying the unit.
• Do NOT touch any torch parts forward of the
torch handle (nozzle, heat shield, electrode, etc.)
with power switch on.
ARC RAYS can burn eyes and skin;
NOISE can damage hearing.
• Wear welding helmet with No. 6 or 7 lens shade.
• Wear eye, ear, and body protection.
4.2 PRESTOLITE® 550 CONTROLS
(FIGURE 4-1)
A. Power Switch (located on front panel). When
placed in ON position, the white pilot light will glow
indicating control circuit is energized and the cooling
fan will run.
B. Output Current Control. Adjustable from 15 to 35
amperes to suit cutting conditions.
C. Air Check Push Button Switch. When energized,
air filter-regulator can be adjusted to desired pressure (55-65 psig) before cutting operations. Allow
air to flow for a few minutes. This should remove any
condensation that may have accumulated during
shutdown period. After setting the pressure, release
the button to its normal position.
D. "Over Temperature" LED Yellow light - will turn
on if the machine becomes overheated. Will turn off
automatically after the machine cools down if the
on/off switch is still on.
Position the Prest-O-Lite® 550 at least 10 feet (3 meters) from the cutting area. Sparks and hot slag from
the cutting operation can damage the unit.
FAULT LIGHT
AMBER
POWER ON-OFF
(I-O) SWITCH &
CIRCUIT BREAKER
AIR LIGHT
GREEN
AIR CHECK
BUTTON
AIR PRESSURE
GAUGE
550 PLASMA CUTTER
AIR REGULATOR
CONTROL KNOB
REAR VIEW
CURRENT
CONTROL
KNOB
Figure 4-1. Prest-O-Lite® 550 Controls
25
SECTION 4 OPERATION
E. "Low Air Flow" LED Green light -
will turn on during
operation when the air flow is correct. Will switch off
below 15psi (1 bar).
F. On/Off Switch (White light) - will light when switched
on, even if the machine stopped for any reason. Will turn
off when switch is in OFF position or the light bulb is
defective.
G. Air Pressure Gauge (Front Panel) - Shows air pressure
in bars and psi.
4.3 ASSEMBLING PT31XL COMSUMABLE
PARTS
Make sure power switch on power source is in OFF
position and primary input power is deenergized.
To assemble “XT” consumables, remove the seat supplied with
the torch. Insert the plunger into the head. (The plunger is
reversible.) Then reassemble the seat firmly with a wrench.
Install the electrode, baffle, nozzle, and heat shield as shown in
Fig. 4-2. Tighten heat shield snugly but do not overtighten.
The PT-31XL torch head contains a gas flow check
valve that acts in conjunction with the flow switch
and circuitry within the power source. This system
prevents the torch from being energized with high
voltage if the torch switch is accidentally closed
when the shield is removed. ALWAYS REPLACE
TORCH WITH THE PROPER TORCH MANUFACTURED
BY Prest-O-Lite SINCE IT ALONE CONTAINS Prest-OLite’S PATENTED SAFETY INTERLOCK.
For additional torch information, see booklet (F-14-246)
packed with the PT-31XL torch.
4.4 CUTTING WITH THE PT31XL
Wear the usual protective gloves, clothing, and helmet. Helmet with filter lens shade No. 6 or 7 should
provide adequate protection for your eyes.
Never touch any parts forward of the torch handle
(tip, heat shield, electrode, etc.) unless the power
switch is in the OFF position.
BE SURE to install the swirl baffle in the torch. Failure
to do so would allow the nozzle (tip) to contact the
electrode. This contact would permit high voltage to be
applied to the nozzle. Your contact with the nozzle or
workpiece could then result in serious injury or death
by electric shock.
Plunger
0558006192
NOTE: Nozzles
Marked By
Amperage
Seat
0558006191
0558006190
Electrode
CAUTION: Do not depress the torch switch unless the
torch nozzle is touching or within 0.020-in.
(less than 1/32-in.) of the workpiece.
TOO FAST TOO SLOW CORRECT
Fig. 4-3 - Effect of Cutting Speed
Baffle
0558006189
Nozzle
0558006187
30/40A
Heat Shield
0558006185
Fig. 4-2 - Assembly of “XT” Consumable Parts
26
SECTION 4 OPERATION
WHEN THE ARC BREAKS
2
THROUGH THE WORK, BRING THE
TORCH TO AN UPRIGHT POSITION AND PROCEED TO CUT.
TO START A PIERCE, TILT THE TORCH
1
TO PREVENT MOLTEN MATERIAL FROM
COMING BACK AGAINST AND DAMAGING THE TORCH.
Figure 4-4. Piercing Technique using the PT-31XL
CAUTION: Locate the console at least 10-ft. from the cutting
work area. Chips and hot slag from the cutting
operation can damage the console.
After placing the primary (wall) switch to the ON position and
making control and air pressure adjustments as described
above, proceed as follows:
1. Touch the tip of the torch to the workpiece (or within
0.020-in. of the workpiece) holding the torch at about
15- 30° angle to avoid damaging the tip.
2. Depress the torch switch. (Air and high frequency should
energize.)
3. Two seconds after depressing torch switch, the plasma arc
will start cutting.
4. After starting the cut, the tip can be dragged along the
workpiece if cutting up to 1/4'’ thick material. When cutting material greater than 1/4'’, maintain a 1/8'’ tip-to-work
(standoff) distance.
5. When ending a cut, the torch switch should be released
and lifted off the workpiece just before the end of the cut
to minimize double-arcing which can damage the tip. This
is to prevent high frequency from reigniting after cutting
arc extinguishes.
6. In the postflow mode, the arc can be restarted immediately
by depressing the torch switch. The two second preflow
will automatically cancel.
Cutting Speed Range — Prest-O-Lite® 550
(Using Air with XT Consumables @ 75 psi)
Output Cutting
Thickness Current Speed
Material (In.) (Amps) (ipm)
Carbon 1/16 30 180
Steel 1/8 30 75
(AISI 1020) 1/8 35 85
1/4 35 30
3/8 35 15
1/2 35 12
Stainless 1/16 30 200
Steel 1/8 30 85
(AISI 304) 1/8 35 85
1/4 35 30
3/8 35 14
1/2 35 10
Aluminum 1/16 30 200
(6061) 1/8 30 85
1/8 35 85
1/4 35 30
3/8 35 15
1/2 35 12
NOTE: The speeds given here are typical for best quality cuts. Your actual
speeds may vary depending on material composition, surface condition, operator technique, etc. If cutting speed is too fast, you may
lose the cut. With slower speeds excessive dross may accumulate.
If speed is too slow, the arc may extinguish. Air cutting typically
produces a rough face on stainless steel and aluminum.
27
SECTION 4 OPERATION
4.5 OPERATING TECHNIQUES
(In some materials and thick-
1. Piercing - Materials (up to 1/4-in. thick) may be pierced
with the torch touching the work. When piercing thicker
materials (up to 3/16-in. aluminum or 1/4-in. stainless
or carbon steel) immediately raise the torch to 1/16-in.
standoff after initiating the cutting arc. This will reduce
the chance of spatter from entering the torch and prevent the possibility of welding the tip to the plate. The
torch should be angled at about 30° when starting to
pierce, and then straightened after accomplishing the
pierce.
2. Grate Cutting - For rapid restarts, such as grate or
heavy mesh cutting, do not release the torch switch.
This avoids the 2 second preflow portion of the cutting
cycle.
4.6 COMMON CUTTING PROBLEMS
Listed below are common cutting problems followed by the
probable cause of each. If problems are determined to be
caused by the Prest-O-Lite® 550, refer to the maintenance
section of this manual. If the problem is not corrected
after referring to the maintenance section, contact your
Prest-O-Lite representative.
A. Insufficient Penetration.
1. Cutting speed too fast.
2. Damaged cutting nozzle.
3. Improper air pressure.
B. Main Arc Extinguishes.
1. Cutting speed too slow.
C. Dross Formation.
nesses, it may be impossible to get dross-free
cuts.)
1. Cutting speed too fast or too slow.
2. Improper air pressure.
3. Faulty nozzle or electrode.
D. Double Arcing. (Damaged Nozzle Orifice.)
1. Low air pressure.
2. Damaged cutting nozzle.
3. Loose cutting nozzle.
4. Heavy spatter.
E. Uneven Arc.
1. Damaged cutting nozzle or worn electrode.
F. Unstable Cutting Conditions.
1. Incorrect cutting speed.
2. Loose cable or hose connections.
3. Electrode and/or cutting nozzle in poor condition.
G. Main Arc Does Not Strike.
1. Loose connections.
H. Poor Consumable Life.
1. Improper gas pressure.
2. Contaminated air supply.
28
SECTION 5 MAINTENANCE
5.1 GENERAL
If this equipment does not operate properly, stop work
immediately and investigate the cause of the malfunction. Maintenance work must be performed by an
experienced person, and electrical work by a trained
electrician. Do not permit untrained persons to inspect,
clean, or repair this equipment. Use only recommended
replacement parts.
Be sure that the wall disconnect switch or wall circuit
breaker is open before attempting any inspection or
work inside of the Prest-O-Lite® 550.
5.2 INSPECTION AND CLEANING
Frequent inspection and cleaning of the Prest-O-Lite® 550 is
recommended for safety and proper operation. Some suggestions for inspecting and cleaning are as follows:
A. Check work cable to workpiece connection.
B. Check safety earth ground at workpiece and at power
source chassis.
G. With all input power disconnected, and wearing
proper eye and face protection, blow out the inside
of the Prest-O-Lite® 550 using low-pressure dry
compressed air.
5.3 FLOW SWITCH FIGURE 51
When excessive contamination is found in the air, the
flow switch (FS) should be removed, disassembled and
cleaned as follows:
A. Ensure the system is shut down and there is no
trapped air under pressure in the piping.
B. Remove the piston plug.
C. Remove the spring (FS-4 only). Use care when han-
dling spring to prevent distortion.
D. Remove the piston.
E. Clean all parts with cleaning agent.
NOTE
Ensure cleaning agent does not contain solvents
which can degrade polysulfone. Warm water and
detergent is recommended for cleaning. Allow all
parts to dry thoroughly before reassembly.
Reassemble the flow switch in reverse order.
C. Check heat shield on torch. It should be replaced if
damaged.
D. Check the torch electrode and cutting nozzle for wear on
a daily basis. Remove spatter or replace if necessary.
E. Make sure cable and hoses are not damaged or
kinked.
F. Make sure all fittings and ground connections are
tight.
Water or oil occasionally accumulates in compressed air
lines. Be sure to direct the first blast of air away from the
equipment to avoid damage to the Prest-O-Lite® 550.
PISTON PLUG
SPRING
PISTON
FLOW SWITCH
Figure 5-1. Disassembly / Assembly of Flow Switch
29
SECTION 5 MAINTENANCE
30
SECTION 6 TROUBLESHOOTING
6.1 TROUBLESHOOTING
The cause of control malfunctions can be found by
referring to the sequence of operations and electrical schematic diagram (Figure 5-1) and checking
the various components. A volt-ohmmeter will be
ELECTRIC SHOCK CAN KILL! Be sure that all primary
power to the machine has been externally disconnected. Open the line (wall) disconnect switch or circuit
breaker before attempting inspection or work inside
of the power source.
Check the problem against the symptoms in the following
troubleshooting guide. The remedy may be quite simple. If
the cause cannot be quickly located, shut off the input power,
open up the unit, and perform a simple visual inspection
of all the components and wiring. Check for secure terminal connections, loose or burned wiring or components,
bulged or leaking capacitors, or any other sign of damage
or discoloration.
necessary for some of these checks.
Voltages in plasma cutting equipment are high
enough to cause serious injury or possibly death.
Be particularly careful around equipment when the
covers are removed.
NOTE
Before checking voltages in the circuit, disconnect the
power from the high frequency generator to avoid damaging your voltmeter.
6.2 TROUBLESHOOTING GUIDE
A. Difficult Starting.
• Change electrode
• Change nozzle
• Check for good, clean connection of work lead to workpiece
• Check air pressure 55 -65 psi (4 - 5 bar)
• Check torch power cable for continuity
Depress torch switch. After 2 seconds, is high frequency present?
Yes
Is the "Air" LED light on
Yes No
Repair/replace
power source
Repair/replace
control PCB
No
Repair/replace
high frequency
unit
31
SECTION 6 TROUBLESHOOTING
B. No Air
Is air hose connected?
Yes No Connect
Is air adjusted to 55 - 65psi (4 - 5 bar)?
Yes No Adjust
Does air come on with air check switch?
Yes No • No electrode in torch
• No valve pin in torch
• Replace electrode
Check continuity of torch switch • Replace valve pin
OK No Replace torch switch
Repair /replace power source
C. Air does not shut off
Does arc start when nozzle contacts work without depressing torch switch?
Yes No
Check for short in torch switch
Does air flow even when Prest-O-Lite® 550 power switch is OFF?
Yes No
Replace Repair/replace control
solenoid valve PCB
32
SECTION 6 TROUBLESHOOTING
D. On/Off switch light not energized.
Is switch ON?
Yes No Turn on switch
Is plug in receptacle?
Yes No Insert plug
Is cooling fan turning?
Yes No
Replace
On/Off switch
Check voltage at receptacle and input power line
Yes No Check main fuses
Replace On/Off
switch
33
SECTION 6 TROUBLESHOOTING
E. Temperature LED light ON.
Is the unit overheated?
(LED turns off
when unit cools down.)
Yes No
Is cooling air flowing?
Duty cycle exceeded:
40% @ 35 A Yes No
or 100% @ 22 A output
Repair power source Repair fan
F. No current output
Is input voltage within -10% of units input rating?
Yes No
See (D.) sequence above
Unsolved
Repair/replace Inverter
34
SECTION 6 TROUBLESHOOTING
35
SECTION 6 TROUBLESHOOTING
6.3 SEQUENCE OF OPERATION
PUSH RELEASE
TORCH SWITCH
OPEN CLOSE
GAS SOLENOID VALVE
PREFLOW
FLOW SWITCH CLOSE
FAULT OVERLOAD LIGHT
HF CIRCUIT
INVERTER
CUTTING ARC (CURRENT)
2 SEC.
ENERGIZE
10 SEC
Postflow
OPEN
NOTES:
1. When the torch switch is depressed during postflow period, the postflow and preflow times are canceled,
and the HF is energized immediately. The postflow time starts from the moment the torch switch is
released.
2. When the amber fault pilot light comes on, cutting operation should be stopped.
36
SECTION 7 REPLACEMENT PARTS
7.0 Replacement Parts
7.1 General
Always provide the serial number of the unit on which the parts will be used. The serial number is stamped on
the unit nameplate.
7.2 Ordering
To ensure proper operation, it is recommended that only genuine Prest-O-Lite parts and products be used with
this equipment. The use of non-Prest-O-Lite parts may void your warranty.
Replacement parts may be ordered from your Prest-O-Lite Distributor.
Be sure to indicate any special shipping instructions when ordering replacement parts.
Refer to the Communications Guide located on the back page of this manual for a list of customer service phone
numbers.
Note
Bill of material items that have blank part numbers are provided for customer information only.
Hardware items should be available through local sources.
37
SECTION 7 REPLACEMENT PARTS
10
16
13
9
8
7
11
3
6
14
4
5
12
2
17
15
SECTION 7 REPLACEMENT PARTS
Spare Parts List
Prest-O-Lite® 550
Item No. Part No. Description Cct. Ref.
1 0558004493Y Cover (Not Shown)
2 0558002033 Knob
3 0558002754 Inverter/Main PCB
4 0558002755 Control PCB
5 0558002756 HF PCB
6 0558002757 HF Generator
7 0558002738 Fan VR1 & 2
8 0558004479 Fan Grid
9 951202 Flow Switch
10 0558004399 Main Power Cable w/Plug 10Ft.
11 0558002746 EMI Filter
12 0558002747 ON/OFF Switch S1
13 0558002764 Solenoid Valve Assembly
14 0558004498 Plasma Torch
15 680560 Earth Cable w/Clamp
16 21710 Air Regulator/Filter
17 21711 Pressure Gauge
18 0558004494Y Side Panel (Not Shown)
19 0558004478 Handle (Not Shown)
NOTES
40
NOTES
41
NOTES
Original release 06 / 2006
03 / 2007 - Revised Title Page layout / text.
REVISION HISTORY
Prest-O-Lite Welding & Cutting Products,
PO Box 100545, Florence, SC
COMMUNICATION GUIDE - CUSTOMER SERVICES
A. CUSTOMER SERVICE QUESTIONS:
Telephone: (800)362-7080 / Fax: (800) 634-7548 Hours: 8:00 AM to 7:00 PM EST
Order Entry Product Availability Pricing Order Information Returns
B. ENGINEERING SERVICE:
Telephone: (843) 664-4416 / Fax : (800) 446-5693 Hours: 7:30 AM to 5:00 PM EST
Warranty Returns Authorized Repair Stations Welding Equipment Troubleshooting
C. TECHNICAL SERVICE:
Telephone: (800) 372-2123/ Fax: (843) 664-4452 Hours: 8:00 AM to 5:00 PM EST
Part Numbers Technical Applications Specifications Equipment Recommendations
D. LITERATURE REQUESTS:
Telephone: (843) 664-5562 / Fax: (843) 664-5548 Hours: 7:30 AM to 4:00 PM EST
E. WELDING EQUIPMENT REPAIRS:
Telephone: (843) 664-4487 / Fax: (843) 664-5557 Hours: 7:30 AM to 3:30 PM EST
Repair Estimates Repair Status
F. WELDING EQUIPMENT TRAINING
Telephone: (843)664-4428 / Fax: (843) 679-5864 Hours: 7:30 AM to 4:00 PM EST
Training School Information and Registrations
G. WELDING PROCESS ASSISTANCE:
Telephone: (800) 372-2123 Hours: 7:30 AM to 4:00 PM EST
H. TECHNICAL ASST. CONSUMABLES:
Telephone : (800) 933-7070 Hours: 7:30 AM to 5:00 PM EST
IF YOU DO NOT KNOW WHOM TO CALL
Telephone: (800) 372-2123
Fax: (843) 664-4462
Hours: 7:30 AM to 5:00 PM EST
or
visit us on the web at http://www.all-statewelding.com
The Prest-O-Lite web site offers
Comprehensive Product Information
Material Safety Data Sheets
Warranty Registration
Instruction Literature Download Library
Distributor Locator
Global Company Information
Press Releases
Customer Feedback & Support
Form No: 0558006082 03 / 2007
A member of the
ESAB Group
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