Lincoln Electric 718115 Spirit II 275 - Manual (Page 73)

Spirit II User’s Manual Section 5: Torch Consumables and Cutting Charts
This information is subject to the controls of the Export Administration Regulations [EAR]. This information shall not be provided to
non-U.S. persons or transferred by any means to any location outside the United States contrary to the requirements of the EAR.
5-3
Maximizing Consumable Life
Use the following guidelines to maximize consumable parts life:
1. The Spirit system utilizes the latest advancement in technology for extending the life
of the torch consumable parts. To maximize the life of the consumable parts, it is
imperative that the shutdown procedure of the arc is carried out properly. The arc
must be extinguished while it is still attached to the workpiece. A popping
noise may be heard if the arc extinguishes abnormally. Note that holes are usually
programmed without lead-outs to prevent loss of the arc during shutdown. There is
a time delay between the reception of a stop signal and when the arc is
extinguished. During this time, the gases and cutting current are changed to
optimum values for extinguishing the arc. Ideally, the x/y machine controller should
provide a plasma stop signal prior to the end of the cut path so the gases and
current reach the shut off values at the same time that the part has been completely
cut. The shut down times are different for each current and are given below.
Arc Shutdown Times
Current (A) Time (ms)
30 490
50 390
70 300
100 300
150 175
200 195
260 175
275 175
2. Use the recommended pierce height given in the cutting charts. A pierce height that
is too low will allow molten metal that is ejected during the piercing process to
damage the shield cap and nozzle. A pierce height that is too high will cause the
pilot arc time to be excessively long and will cause nozzle damage. See “Piercing
Thick Materials” in Section 4.
3. Never fire the torch in the air. Nozzle damage will occur.
4. Make sure the torch does not touch the plate while cutting. Shield cap and nozzle
damage will result.
5. Use a chain cut when possible. Starting and stopping the torch is more detrimental
to the consumables than making a continuous cut.
6. Always use error tracking on the plasma console to keep track of cut errors. See
Section 4 for information on error tracking.