Tweco 150 Ultra-Cut - Manual (Page 71)

Manual No. 0-4800 4-7 OPERATION
Sequence Of Operation
1. Set the Plasma Power Supply Enable / Disable switch to Disable.
DANGER
Alway shut off input power to the system before changing or inspecting torch parts.
a. Change the torch parts if necessary.
b. Set the Plasma Power Supply Enable / Disable switch (on the Gas Control Module) to Enable. The
Module performs purges of 15 seconds, 11 seconds, and another 11 seconds. This removes water from
the torch parts.
2. Select the desired plasma and shield gas by setting the Gas Selection switch to the desired position. 2
seconds after gas selection, the module purges the new gas(es) through the leads.
3. Set the preflow gas pressure.
a. Set the MODE switch to SET PREFLOW.
b. Use the PREFLOW control knob to set preflow gas pressure. Refer to the torch manual for pressure
settings.
c . Use the AMPERAGE SET-UP control knob to set the desired pre-charge pressure set point.
Press the control knob for 2 seconds without rotating. Then rotate the knob to adjust pressure.
4. Set the plasma and shield gas pressures and flows.
a. Set the MODE switch to SET PLASMA & SHIELD.
b. Use the PLASMA and SHIELD control knobs, pressure gauges, and flow meters to set plasma and
shield gas pressures and flows. Refer to the torch manual for pressure settings.
c . In installations using water shield, use the H
2
O MIST control knob and flow meter to set water flow rate.
Refer to the torch manual for flow rates.
5. Use the AMPERAGE SET-UP control knob to set the desired amperage output. The module will update
the amperage every 2 seconds after the last adjustment to the knob. The module keeps the set point in
memory.
6. Place the MODE switch to the RUN position.
7. Set the Plasma Power Supply Enable / Disable sswitch (on the Gas Control Module) to Enable. The
Module performs purges of 15 seconds, 11 seconds, and another 11 seconds. This removes water from the
torch parts.
NOTE
When switching gases between operations, allow enough purge time to clear the prior gas from the torch leads.
CAUTION
While nothing prevents the operator from switching gases during piloting or cutting it is not recommended to do
so. If the operator switches gases during piloting or cutting, the power supply will finish the cut with the first gas
chosen. Then the gas control will switch to the new gas. Switching gases during piloting or cutting may damage
torch parts, torch leads, the control module, or the piece being cut.