Lincoln Electric IM944 POWERTORCH PLASMA 20 - Manual (Page 9)

A-3 INSTALLATION
POWERTORCH™ PLASMA 20
A-3
Use of normal 20 amp household breakers may result
in over current trips. If breaker trips occur, reduce the
cutting current output until nuisance trips stop.
COMPRESSED AIR OR GAS INPUT
CONNECTION
A source of clean, dry air or nitrogen must be supplied
to the POWERTORCH™ PLASMA 20. Oil in the air is
a severe problem and must be avoided. The supply
pressure must be between 72.5 and 150 psi (5 and
10.3 bar). The flow rate is approximately 3.5 cu.
ft./min. (100L/min.). Failure to observe these precau-
tions could result in excessive operating temperatures
or damage to the torch.
Air with considerable quantity of humidity or oil
may cause an excessive wear of the parts or even
damage the torch.
If there are any doubts about the quality of the
compressed air available, it is suggested that an
air dryer be installed before the input filter . Using
flexible airline, connect the compressed air to the
rear of the machine. Do not exceed maximum
entry pressure of 150 PSI (10.3 Bar). The pressure
must be adjusted to 72.5 PSI (5 Bar), minimum.
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• To use the air fitting supplied with the machine apply
teflon tape to the fitting threads and install the fitting in
the port at the rear of the machine.
NOTE: When using nitrogen gas from a cylinder, the
cylinder must have a pressure regulator.
• Maximum psi from a nitrogen gas cylinder to
the POWERTORCH™ PLASMA 20 regulator
should never exceed 150 psi (10.3 Bar).
• Install a hose between the nitrogen gas cylin-
der regulator and the POWERTORCH™
PLASMA 20 gas inlet.
CYLINDER could explode if damaged.
• Keep cylinder upright and
chained to a fixed support.
• Keep cylinder away from areas
where it could be damaged.
• Never lift machine with cylinder
attached.
• Never allow the cutting torch to touch the
cylinder.
• Keep cylinder away from live electrical
parts.
• Maximum inlet pressure 150 PSI (10.3
Bar).
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CONNECTION TO GROUND CABLE
Connect the work cable clamp to the piece to be cut
or to the metallic workbench. Take the following pre-
cautions:
Verify that there is a good electrical contact particular-
ly if insulated or oxidated coated sheets are cut.
Make ground connections as close as possible to the
cutting area. The use of the metallic structures which
are not part of the workpiece, such as return cable of
the cutting current, may endanger the safety system
and give poor cutting results.
Do not make a ground connection on the piece which
is to be cut off.
TORCH CONNECTION
Before starting the cutting operations verify that
the parts are properly assembled by inspecting
the head of the torch as shown in the “Operations
Section”(Torch Consumable Parts).
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Read and understand this entire section before oper-
ating the machine.
WARNING
WARNING
WARNING