Saf-Fro PRESTOJET 60, Operator'S Manual, Page: 14 / 224

English 10 English
Cutting Process
The air plasma cutting process uses air or nitrogen as
primary cutting gas and as torch cooling gas.
The pilot arc is struck as follow: the torch button
energize an electrovalve (solenoid valve). This valve
lets the gas flow during the cutting and the post-flow
stages.
The design concept at the basis of these power sources
is to have available a current which remains constant at
the set value, independently from the length of the
plasma arc.
When preparing to operate, make sure you have all
materials needed to complete the job and have taken all
safety precautions. Install the machine as instructed in
this manual and remember to attach the work clamp to
the work piece.

With the machine switched OFF, prepare the torch
with the consumables adequate to the desired
process (CUT / GRID / GOUGE). Refer to the
Torches Instruction Manual to select the correct
combination of consumables.

Connect the Torch and the worck cable to the
machine.

Turn ON the Power Switch placed on the back of the
machine; the Power ON/OFF LED on the front panel
will turn ON. The unit is now ready to operate.

Check that the primary gas is available through the
Gas Purge function.

Select the desired Operating Mode process.

Set the desired current value with the Output Current
knob.
To start the selected process just press the torch button,
making sure you are not aiming the torch gas blow
towards people or foreign objects. During the process it
is possible to hold the torch away from the work piece for
an extended period of time.
Once the process is terminated releasing off the torch
button will cause the plasma arc to be turned off; the gas
flow will continue to allow the cooling down of the torch.
The Post Flow time is proportional to the selected cutting
current and it is divided into 4 time ranges:
Selected Cutting Current Post Flow Time
Less than 30A 15seconds
Between 30A and 40A 20seconds
Between 40A and 50A 25seconds
Greater than 50A 30seconds
Maintenance
WARNING
For any maintenance or repair operations it is
recommended to contact the nearest technical service
center or Lincoln Electric. Maintenance or repairs
performed by unauthorized service centers or personnel
will null and void the manufacturers warranty.
The frequency of the maintenance operations may vary
in accordance with the working environment. Any
noticeable damage should be reported immediately.

Check cables and connections integrity. Replace, if
necessary.

Regularly clean the torch head, check its
consumables and if necessary replace them.
WARNING
Refer to the torch instructions before changing or
servicing the torch.

Keep clean the machine. Use a soft dry cloth to
clean the enclosing case, especially the airflow inlet /
outlet louvers.
WARNING
Do not open this machine and do not introduce anything
into its openings. Power supply must be disconnected
from the machine before maintenance and service. After
each repair, perform proper tests to check safety
requirements.