23
3.5 GENERAL OPERATING NOTES
The suggestions below should be followed in all cutting
and gouging operations:
1. Wait five minutes before opening the main disconnect
switch after shutdown. This allows the cooling fan to
run to dissipate operating heat from the unit.
2. For maximum parts life, do not operate the pilot arc any
longer than necessary.
3. Use care in handling torch leads and protect them from
damage.
4. In continuous cutting applications using CO2, it is often
necessary to manifold four to six cylinders together to
maintain flow at 75 psi (5.2 bar).
FREQUENTLY REVIEW THE SAFETY PRECAUTIONS
AT THE FRONT OF THIS MANUAL.
It is not enough to simply move the ON/OFF switch on
the unit to OFF p osition when cutting operations have
been completed. Always open the power supply discon-
nect switch five minutes after the last cut is made.
NOTE
WARNING
3.6 COMMON OPERATING PROBLEMS
Listed below are common cutting problems followed by
probable causes of each. If the problems are caused by a
power supply problem, refer to the Troubleshooting
Guide, page 31).
a. Cutting speed too high
b. Current too low
c. Metal too thick
d. Worn or damaged torch parts
a. Cutting speed too low
b. Standoff too high
a. Improper gas pressure
b. Improper cutting speed
(See Figure 3-H and 3-I, pages 24 - 25)
c. Worn or damaged torch parts.
a. High cutting current
b. Damaged or loose cutting tip
c. Tip in contact with work
d. Heavy spatter
e. Low plasma gas pressure
OPERATION
Main Arc Extinguishes
Dross Formation
Burned-Out Tips
Insufficient Penetration
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