MK Welding PC 100 LCD CNC, Руководство пользователя

Страница: 41 / 58

17
EN
Pilot Arc System
CUT series of Air Plasma Cutting machines use a pilotarc 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 flowing 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 models also have a plot 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 orifice that the plasma passes through.
If the orifice 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