Tweco XTTM-300 - Manual (Page 25)

Manual 0-2912 4A-1 Operation with Manual Gas Control
SECTION 4-A:
OPERATION WITH MANUAL GAS CONSOLE
4A.01 Torch Parts Selection
The application will determine which torch parts must be used. Refer to the speed charts in Section 4.02, Recom-
mended Cutting Speeds, for the proper torch parts to install for a selected application.
CAUTION
Do not interchange parts. Make sure all parts in the torch correspond with the plasma and shield gas in use for the
application.
4A.02 Pre-Setting Controls
A. Power Supply Setting
Set the Power Supply controls as follows before operating the system.
1. Set the proper cutting current at the AMPS thumbwheel.
2. Use data from the Speed Charts in Section 4.03 for each combination of material and amperage:
a. Set the initial torch height.
b. Set arc voltage on the torch height control.
c. Set the PIERCE DELAY potentiometer.
3. On the gas console select the plasma gas to be used with the PROCESS SELECTION switch.
4. All gas supplies are connected and set at 120 psi (8.3 bar) at the inlet pressure gauges.
B. Pre-Charge Box Setting
Before operating the system:
1. Set the gas supply pressure at the oxygen cylinder to 120 psi (8.3 bar).
2. On the front of the gas console set the RUN TEST switch to the TEST PREFLOW position. This will enable
gas to flow by opening the solenoid in the Pre-Charge Box.
3. If system plasma pressure gauge indicates more than 120 psi (8.3 bar) the system is over pressurized. Stop
and do the following:
a. On the front of the gas console set the RUN TEST switch to the TEST CUT FLOW position.
b. Let gas flow for 20 seconds. This will allow the system pressure to bleed off.
c. Repeat steps 2 and 3 above.