Maintenance And Checks; Basic Safety Precautions - Cebora PLASMA PROF 122 Manual De Instrucciones

If the unit is used without these parts, it can damage the device
and is especially hazardous to the operator's safety.
5.2 REPLACING THE TORCH ASSEMBLY Q
Open the grip by removing the screws. Remove the screws
holding the terminals of the safety conductors S-S1. Remove the
screw holding the conductor for the pilot arc U after first cutting
the insulating tube K1. Remove the fitting V after first cutting the
insulating tube K. Mount the new torch assembly by performing
the above steps in reverse order.
The fitting V and conductor U are insulated by attaching the
heat-shrink tubes K and K1 directly to the fittings themselves.
Do this by heating the tube with a small heat source (i.e., a
cigarette lighter). Before replacing the grip, make sure that all
connections have been firmly tightened.
5.3 REPLACING THE TORCH FITTING W
Remove the ring-nut I and cut the clamps holding the cable J.
Unscrew the screw M and slide the cover L out backwards.
Remove the control cable pegs X and Z and the red pilot arc wire
pegs Y and Y1. Cut the insulating tube K2 and unscrew the
assembly N from the fitting V1. Mount the new assembly by
performing the above steps in reverse order. To lock the thread
of assembly N onto the fitting V1, use sealing adhesive for
threads. The pegs X and Z of the control cable must be
connected to contacts 1 and 9 of the assembly N. The pegs Y
and Y1 of the red cables for the pilot arc must be connected to
the contacts 5 and 6 of the assembly N. The tube K2 acts as
insulation, and is attached to the fitting V1 by heating it.
5.4 REPLACING THE CABLE J
To replace the cable, proceed as described in points 5.2 and 5.3.
For the manual torch, it is necessary to make the connection R.
NOTE: The connection R must be carefully insulated.
5.5 REPLACING THE BUTTON T (manual torch)
Remove the lever T1, unscrew the screws and open the grip.
Then unscrew the screw S holding the cable terminal of the
button, cut the connection R, remove the button, insert the new
button and perform the above steps in reverse order. Insulate the
connection R carefully.
5.6 REPLACING THE GRIP (manual torch)
The grip can be replaced by following the instructions given in
point 5.5.
5.7 REPLACING THE GRIP (torch for use in automatic mode)
The grip can be replaced by following the dismantling instruc-
tions given in point 5.2; remove the grip and mount the new one,
then follow the previous steps in reverse order to reassemble.
5.8 REPLACING THE DIFFUSOR TUBE H
Unscrew the shield cup D, remove the tip E and the diffusor F;
unscrew the electrode G and then the tube H. Mount the new
diffusor tube by screwing it on with the 6-gauge wrench provided,
then perform the above steps in reverse order.

6 MAINTENANCE AND CHECKS

Before opening the machine, always disconnect the plug from
the mains.
The motor-driven fan on the machine is thermostat-controlled,
and thus starts only when the generator needs to be cooled.
In case of repairs inside the machine, make sure that the switch
A is in "O" position and that the mains cable is disconnected from
the socket. The fan not turning does not mean that the machine
is OFF.
Any maintenance must be performed only by qualified person-
nel, aware of the risks due to the high voltages necessary in order
for the device to operate.
Any operations requiring access to the inside of the machine
must be carried out only after unplugging the mains cable from
the electrical source.
It is important to keep the tip clean of metal waste. Do not use
sharp objects to avoid deteriorating the hole of the tip. If you have
trouble removing the electrode, proceed as follows: lubricate the
threading of the electrode with penetrating lubricating fluid, then
unscrew the electrode. If the threading of the electrode holder
support on the torch assembly is damaged while removing the
electrode, tap it with a male M11 after first removing the diffuser
tube H (fig. 8).
To prevent metal residue from remaining inside the torch assem-
bly during this operation, we recommend blowing into the torch
with compressed air while tapping.
Although the machine is equipped with an automatic condensa-
tion drainage device, which is started each time the air supply is
cut off, it is a good habit to periodically make sure that there is
no trace of condensation in the tray N (fig. 2) of the reducer.
Accumulated metal dust must be cleaned from the inside of the
machine periodically, using compressed air.
6.1 PRECAUTIONS TO TAKE AFTER A REPAIR
After making repairs, take care to re-order the cables so that
there is sure to be insulation between the primary and secondary
sides of the machine. Make sure that the wires cannot come into
contact with moving parts or parts that heat during operation.
Replace all clamps in their original positions on the machine, to
prevent a connection between the primary and secondary cir-
cuits if a conductor accidentally breaks or disconnects.
Mount also the screws with the toothed washer in the original
position.

7 BASIC SAFETY PRECAUTIONS

7.1 ELECTRIC SHOCK
Electric shock can kill. All electric shocks are potentially fatal.
This plasma cutter requires high voltages for arc spark
starting (approx. 250 ÷ 300 V). The following safety rules
must be therefore observed when using the unit:
• Do not touch live parts.
• Insulate yourselves from the piece to be cut and from earth by
wearing insulating gloves and clothing
• Keep your clothing (gloves, shoes, hats, dresses) and body dry
• Do not work in humid or wet areas
• Avoid touching or holding by hand the piece to be cut
• Always arrange for a proper insulation against electric shock.
Should you work close to or in a dangerous area use all
possible precautions.
• If you feel even the slightest electric shock sensation, stop
cutting at once. Do not use the machine until the problem is
identified and solved.
• Always fit an automatic wall switch with adequate power, if
possible close to the machine so as to immediately switch the
unit off in an emergency event.
• Check often mains cable, torch cable, earth cable and torch.
Never use the unit when one of them is damaged. Replace them
immediately.
• Disconnect mains cable from mains before replacing cables
or before removing unit covers.
• Always switch the unit off or disconnect it before replacing
nozzle, swirl ring, electrode or nozzle holder.
• Do not use the unit without protecting covers.
• Always replace any damaged parts of the unit, torch and cables
with original material.
• Never remove torch or unit safety devices.
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