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SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK
can kill.
• Do not touch electrically live parts
or electrode with skin or wet
clothing.
• Insulate yourself from work and
ground.
• Always wear dry insulating
gloves.
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
WELDING, CUTTING and
GOUGING SPARKS
can cause fire or explosion
• Keep flammable material away.
• Do not weld, cut or gouge on contain-
ers that have held combustibles.
ARC RAYS
can burn.
• Wear eye, ear and body
protection.
PLASMA ARC
can injure
• Keep your body away from nozzle
and plasma arc.
• Operate the pilot arc with caution. The
pilot arc is capable of burning the
operator, others or even piercing
safety clothing.
Observe additional Safety Guidelines detailed in
the beginning of this manual.
OPERATION
DESCRIPTION
The PLASMA 20 is a constant current, continuous
control plasma cutter power source.
The PLASMA 20 comes standard with an air regulator
and pressure gauge. The unit is powered from a
115Vac, 20 amp input circuit with a 40% duty cycle
rating on a 10 minute basis, with 20 amp output. The
unit includes a hand-held torch with consumables and
a work cable with clamp.
The PLASMA 20 utilizes a 3 second delay after press-
ing the trigger before arc initiation to ensure that the
operator is ready. The unit will not function if consum-
ables are not installed correctly or missing, protecting
the user. The unit uses pneumatic-action for arc initi-
ation and does not use high-frequency.
Plasma is a gas that is heated to an extremely high
temperature and ionized so that is becomes a conduc-
tor of electricity.
This cutting procedure utilizes the plasma to transfer
the electric arc to the metal workpiece. The arc melts
a small amount of the work piece and the compressed
air blows away the molten metal there by producing
the cutting action.
The torch uses compressed air from a single source,
for both the plasma, cooling and protective gas.
The start of the cycle is determined by an arc, called
the pilot arc, which is struck between the moveable
electrode (negative polarity) and the torch nozzle
(positive polarity) due to a short circuit between these
two elements.
When the torch is brought near the workpiece to be
cut and the trigger is pressed the pilot arc is trans-
ferred between the electrode and the workpiece thus
striking a plasma arc, also called the cutting arc.
The duration of the pilot arc is set in the factory at 3
seconds; if the transfer has not been made within this
time, the cycle is automatically stopped except for the
cooling air which is kept on.
PLASMA 20
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