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F. When ready to cut, place the work lead on the
piece to be cut, place the torch near the work, make
certain all safety precautions have been taken and
pull the trigger.
-The air will flow for a preflow time of 2 seconds
and the pilot arc will start. (This is true unless
the machine is in postflow, then the preflow time
is skipped.)
-The "Output ON" LED will light.
-The pilot arc will run for 1.8 seconds and shut off
unless the plasma is brought in contact with the
work and the arc is transferred.
-When the arc is transferred, cutting begins.
When finished cutting, release the trigger.
G. When the trigger is released, the arc will stop.
-The air will continue to run for 60 seconds of
postflow. If the trigger is activated within the
first 12 seconds, the pilot arc will immediately
restart. After twelve seconds, a double trigger
pull is required to start the arc. The second trig-
ger pull must follow the first within one second
to start the pilot arc.
H. If the "Safety" LED lights at any time, check the following:
WARNING
ELECTRIC SHOCK CAN KILL.
• Turn off machine at the disconnect
switch at the back of the machine before
tightening, cleaning or replacing consum-
ables.
------------------------------------------------------------------------
• Check the assembly of the torch consumables.
If they are not properly in place then machine
will not start.
• Check the conditions of the inside of the nozzle.
If debris has collected, scrape it out with a piece
of sturdy wire or a suitable drill bit. Refer
to"Suggestions for Extra Utility from the PRO-
CUT system".
• After the problem is found, reset the machine by
pressing the "Safety Reset" button. (It is possi-
ble for electrical noise to trip the safety circuit on
rare occasions. This should not be a regular
occurrence.)
• If the machine does not reset or continues to
trip, consult the Troubleshooting Section of this
manual.
Pilot Arc Discussion:
The PRO-CUT has a smooth, continuous pilot arc.
The pilot arc is only a means of transferring the arc to
the workpiece for cutting. Repeated pilot arc starts, in
rapid succession, are not recommended, as this will
reduce consumable life. Occasionally, the pilot arc
may sputter or start intermittently. This is aggravated
when the consumables are worn or the air pressure is
too high. Keep in mind that the pilot arc is designed to
transfer the arc to the workpiece and not for numerous
starts without cutting.
Procedure Recommendations
When properly used, plasma arc cutting or gouging is
a very economical process. Improper use will result in
a very high operating cost.
If the nozzle is touched to the work while cutting, the
output current will be reduced to minimum until the
nozzle is removed from the work.
General
• Follow safety precautions as printed inside the
operating manual and on the machine.
• Either the S19972 standoff guide or S19973
and S19974 contact attachments are recom-
mended for all cutting applications to protect the
torch from dross and improper arcing condi-
tions.
• Use proper cutting or gouging procedures
referred to in procedures guideline.
Material thickness below .75 (19mm):
Output set below mid-range.
• Do not allow the torch cable or body to contact
hot surfaces.
• The best cut quality is obtained by reducing the
current to a level that is adequate for the maxi-
mum travel speed.
• Aluminum, copper and other nonferrous metals
typically require more current than the same
thickness of steel.
• For thickness below .75" (19mm) use an
S19961-2 nozzle (1.4mm dia. orifice). The
S19972 standoff guide should be set in the low-
est position for maximum standoff.
– 12 –
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