Safety Devices - Cebora PLASMA PROF 122 Instruction Manual

contact with the workpiece.
1.4 EXPLANATION OF TECHNICAL SPECIFICATIONS
IEC 974.1 The device is manufactured according to these
EN 60974.1 international standards.
3
P.A.C.
U
V
PEAK
3~
50/60
U
1
Hz
PROTEZIONE TERMICA IP 21
THERMAL PROTECTION
PROTECTION THERMIQUE
THERMISCH GESCHÜTZ
CL.
PROTECCION TERMICA
N° Serial number, to be included in any request
regarding the device.
Drooping characteristic.
Suitable for plasma arc cutting
P.A.C.
Type of torch that may be used with this device.
TORCH TYPE
U Secondary open-circuit voltage (peak value).
0
X Duty cycle.
This expresses the percentage of 10 minutes
during which the device can run at a certain
current without overheating.
I Cutting current.
2
U Secondary voltage with cutting current I
2
U Rated power voltage.
1
3~ 50/60Hz Three-phase 50- or 60-Hz power supply
I Absorbed current at the corresponding cutting
1
current I
2
IP 21 Housing protection rating.
Grade 1 as the second digit means that the ma-
chine is not suitable for use outdoors in the rain.
S Suitable for working in slightly hazardous areas.
NOTE: The device has also been designed to work in
areas with a pollution rating of 3 (see IEC 664).
1.5 START-UP
The machine must be installed by qualified personnel. All
connections must be in compliance with current standards,
and carried out in full respect of safety laws.(CENELEC HD
427).
Connect the air supply to the fitting L, making sure that the plant
is a position to supply at least 250 l/min at a pressure of 5 bar (0.5
MPa).
If the air supply comes from a compressed air cylinder, it must
be equipped with a pressure regulator; never connect a com-
EN 60 974-1
X
%
I
0
A
2
U
V
2
A
V
I
A
V
1
V A
VENTILAZIONE FORZATA
FORCED VENTILATION
VENTILE
H
KUHLART F
VENTILACION FORZADA
pressed air cylinder directly to the machine reducer. The
pressure could exceed the capacity of the reducer, causing
it to explode.
%
A
V
A
A
fig. 3
A
1.5.1 Connection to power mains
Make sure that the supply voltage corresponds to the values
shown on the power cord tag. If not, use the voltage change
terminal board located inside the unit (fig. 3).
The machines are equipped with a function switch; therefore:
a) If the system is permanently connected to the mains without
a plug, a main switch must be inserted with a sufficient capacity,
in accordance with the tag values;
b) If the system is plugged into the mains, use a plug having the
capacity indicated on the tag. In this case, the plug must be
used to fully disconnect the machine from the mains, after first
setting the switch A (fig. 2) to "0" (off).
The yellow-green wire must be connected to the grounding
terminal.
The absorbed current I
specifications listed on the machine, in relation to the power
2
voltage U available.
1
Any extensions must have a size suitable for the absorbed
current I .
1

1.6 SAFETY DEVICES

This unit is fitted with the following safety devices:
Thermal:
To avoid overloads, a thermal safety device is located on the
power transformer coils. When tripped, it lights the indicator lamp
C (see Fig. 2).
Pneumatic:
To prevent the machine from running with insufficient air pres-
sure, a pneumatic safety device is located on the torch feed.
When tripped, it lights the indicator lamp D (see Fig. 2).
Electrical:
1) One device is located on the torch assembly to prevent
hazardous voltages from being present on the torch when the tip,
diffusor, electrode or shied cup are replaced;
2) Another device blocks the machine when the electrode is worn
can be deduced by reading the technical
1
11