Operation
Spirit200a User’s Manual Rev J
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4-23
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
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.
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 the error tracking feature on the automatic gas console to
keep track of cut errors. See Section 5 for information on the error
tracking feature.
