Hypertherm HT2000, Instruction Manual

Page: 92 / 289

POST-INSTALLATION
HySpeed HT2000
Instruction Manual
5-5
22
Adjust Preflow Gases
8. Set the
Test Preflow/Run/Test Cut Flow
toggle switch to
Test Preflow
.
Verify that the plasma gas pressure gauges on the gas console both read 120 psi (8.3 bar). 90 psi for
Air/N
2
process.
9. Look at the oxygen and/or nitrogen-air flowmeters and set the
Preflow
plasma gas flow rate % by
referring to the
Cut Charts
in
Section 6
and turning the oxygen and/or nitrogen-air
Preflow
adjust knobs.
10. Look at the shield gas pressure gauge on the gas console, and set to the
Cut Chart
specifications by
turning the shield gas adjust knob.
Adjust Cut Flow Gases and Check Initial Height Sensing (IHS)
11. Set the
Test Preflow/Run/Test Cut Flow
toggle switch to
Test Cut Flow
.
12. Look at the oxygen and/or nitrogen-air flowmeters and set the
Cut Flow
plasma gas flow rate % by
referring to the
Cut Charts
in
Section 6
. Use the
Cut Flow
toggle switch to set the plasma gases in this
mode. Verify that the O
2
plasma gas pressure reads 120 psi on the gas console. Adjust if necessary.
13. Set the switch to
Run
after setting the preflow and plasma flow rates.
14. Check the pilot arc operation by positioning the torch a
minimum of 3 inches (75mm)
above the work.
15. Depress the
START
button. After two seconds of gas preflow, the primary contactor will close and the
pilot arc will start. The pilot arc should emit a steady, hissing sound and a cone of light should appear at
the face of the torch nozzle. The pilot arc will continue for approximately 300 milli-seconds (O
2
), 600 milli-
seconds (Air/N
2
) and then go out automatically.
16. Place the metal on the work table to make a test pierce. With manual starting, no machine motion will
occur.
Note: The cutting machine must retract the torch at least one inch (25.4 mm) from the work
before the start cycle, or probes may hit the workpiece when START button is depressed.
Command THC users should reference the appropriate Command instruction manual.
17. Depress the
START
button. The probes will immediately descend and approximately 0.5 seconds later,
the torch will index toward the work. The
DOWN
indicator light on the V/C control should be on. When the
torch nears the work, probes will inductively detect work surface and down motion should stop. The
DOWN
indicator light on the V/C module will go off and the probes will start to retract.
At this point, depress the
STOP
button and disable the Initial Height Sensing. You are now ready for Final
Torch Adjustment.