Setting At Work - Snap-On PLASMA50 Manual De Instrucciones

D) Mains pilot light
E) Air pressure regulator
F) Gauge
G) Light signalling thermostat is open
H) Work clamp
I) Water trap
L) Light signalling air pressure is low
M) Cutting power adjusting knob
N) Handle (do not use for lifting up the machine)
5 ASSEMBLY AND ARRANGEMENT
Unpack the unit, fit wheels, stand and handle follow-
ing the instructions of picture 2. Place the unit in prop-
erly ventilated and clean area making sure that the air
inlet and outlet from cooling slots are not obstructed.

6 SETTING AT WORK

The unit must be installed by skilled personnel. All
fittings must be in conformity with the existing rules
and in full compliance with safety regulations.
Connect the air feed to fitting B making sure that pressure
is 88PSI (6bar or 0.6 MPa ) at least with a minimal
capacity of 7 CFM (200 liters/min).
The air fitting to be connected to the pressure regulator
must have a threaded portion no more than 1/4" - 5/16"
long, since a longer thread may cause malfunctions
inside the reducer.
Should air feed come from a pressure reducing unit
of a compressor or of a centralized plant, the reducing
unit should be adjusted at the highest output pressure
which should not exceed 120 PSI (8bar or 0.8 MPa).
Should air feed come from a compressed air bottle, this
should be provided with a pressure regulator; never con-
nect compressed air bottles directly to the reducing
unit! Pressure may exceed the reducing unit capacity
and then explode!
Check that the mains power supply matches that indicat-
ed on the rating plate of the machine.
Connect supply cable A: the yellow-green ground of
cable must be connected to an efficient earth plug of the
system, the remaining wires should be connected to the
feed line by means of the switch placed, if possible,
close to the cutting area so as to switch the unit off
quickly if necessary.
The magnetothermic
series with switch should be equal to the current I1
absorbed by the unit.
Current I1 absorbed is known by reading the tech-
nical specifications on the unit i.e. feed voltage U1 avail-
able.
Any extensions should have adequate sections for cur-
rent absorbed I1.
7 USE
Switch the unit on by turning knob C of the mains switch;
this is shown by light D which is on.
By pressing and immidiately releasing the torch button,
the compressed air flow is opened. Check that, under
this condition, the pressure shown on gauge F is about
65/70 PSI (0.45÷0.47 bar or MPa), otherwise adjust it by
means of knob E of reducing unit, then lock this knob by
pressing it down.
4
switch capacity or of fuses in
Connect work clamp H to the piece to be cut.
Cutting circuit should not be deliberately placed in
direct or indirect contact with protection wire if not in the
workpiece.
If earthing is deliberately made on the workpiece by
means of protection wire, the connection must be as
direct as possible, with the wire having a section at least
equal to the cutting return current wire and connected to
the piece being worked on, in the same place as the
return wire, using the return wire terminal or a second
earth terminal closeby.
All possible precautions must be taken in order to avoid
stray currents.
Set the cutting current by means of the knob M.
Use a Ø 0,9 mm nozzle up to 35A (pos. 1) and a Ø 1,1 mm
one from 35/40A to 50A (pos. 2).
The nozzle may touch the workpiece with currents of up
to 50 A, but wear on the nozzle can be considerably
reduced if one uses the dual-tipped spacer O.
Clean the work piece to ensure good electrical contact of
the work clamp.
Do not connect work clamp to the material to be
removed.
Press torch button to start pilot arc, if cutting does not
start
after 2 or 3 seconds, the pilot arc turns off and the button
should be pressed again to repeat the operation.
When possible, the torch should be pulled. Pulling is eas-
ier than pushing.
Keep torch in vertical position when cutting.
Once cutting is over and after releasing button, air con-
tinues to flow out of the torch for about 60 seconds so it
enables torch to cool down. It is recommended not to
turn the unit off before that time.
Should holes be drilled or should the piece be cut start-
ing from its center, torch should be tilted and then slow-
ly straighten to prevent molten metal from being spread
on nozzle (see picture 3). This operation should be car-
ried out with material thickness above 1/16"(2 mm).
Should circular cut be done it is recommended to use
caliper (supplied on request).
Avoid keeping pilot arc uselessly on, in air to
avoid electrode, diffuser and nozzle consumption.
When you have finished working, turn off the
machine and hang the torch by the hook provided.
8 CUTTING SPEED SCHEME