LOKERMANN GRAND CUT 40 PFC MV, Руководство пользователя, Страница: 8 / 18

Pilot Arc System
GRAND CUT 40 PFC MV uses a pilot arc system to establish the main cutting arc. A pilot arc system
is a circuit where the return is back through the torch head and cable. This means it can create a
small arc with some cutting power without making any electrical connection with the main machine
earth. This is especially useful for starting cuts on material that does not have a good initial earth
connection, such as paint, rust, scale.
Once the pilot arc is established and power is owing back through the main earth, the pilot arc is
switched off and the main arc started. Please note the pilot arc circuit is only designed to operate for
short periods of time as an auxiliary starting system, so it has a safety protection that only allows the
pilot arc to run for short periods at a time. In addition to this, these model also have a pilot arc
controller system if the main arc cuts out and the torch remains to be triggered, the pilot arc will
reignite. This is useful for cutting discontinuous workpieces like mesh or grids.
It is very important to recognize that plasma torch consumables wear as part of normal operation
and should be replaced in a timely manner. Operating a torch with worn consumables will cause
poor cutting results and possible damage to the torch and machine itself. Damage caused by
untimely replacement of consumables will not be covered by warranty.
Use the following guidelines to determine when consumables should be replaced:
Cutting Tips : The cutting tip has a small calibrated orice that the plasma passes through. If the orice
becomes partially blocked, deformed or enlarged, the cutting tip should be replaced.
Electrodes : The electrode has a small silver ‘hafnium’ insert in the end of the tip. This is what generates
the plasma ions. Once the hafnium insert is gone or is damaged the tip must be replaced.
Swirl Ring/Retaining Cap: These should be replaced if broken, chipped, cracked or badly heat
damaged.
Tips and electrodes: These should wear reasonably evenly and it is normal practice to replace them
both together. If a new tip is inserted with a worn electrode the tip will wear much more quickly than
if the electrode was also replaced at that same time. If tips or electrodes are wearing much faster
than the other component it is likely to be caused by one of the following: poor operator technique,
incorrect air supply or damaged torch head.
It is also very important to only use genuine consumables and parts for the LKM CUT 60 torch. They
are engineered to suit the machine and non-genuine items may cause lack of performance, short life
span, torch and machine damage and void warranty.