Tweco 300 Auto-Cut - Manuel (Page 56)

Manual No. 0-4817 Auto-Cut 300 4-4 OPERATION
H. Plasma Gas Purge
Move the Power Supply ON/OFF switch to the ON position.
An automatic gas purge will remove any condensation that may have accumulated in the torch and leads
while the system was shut down. After the purge is complete, if the RUN/SET switch is in SET position, gases
will flow.
I. Amperage Selection
Select the desired current output amperage.
J. Pressure and Flow Settings
1. Refer to the Torch manual for pressure and flow details according to the material being cut. Move the RUN/SET
switch to SET position. (Gas will flow through the torch). Set gas pressures and flows as follows:
2. To set the Plasma Gas pressure:
a. Pull out the knob on the Plasma Gas pressure control knob.
c. Turn the knob to adjust gas pressure.
d. Push the knob back in to lock the pressure setting.
3. To set the Shield Gas pressure: Set the Shield Mode Selector switch to the GAS or H
2
O MIST position.
For Gas Shield:
a. Pull out the Shield Gas Pressure Control Knob.
c. Turn the knob to adjust gas pressure.
d. Push the knob back in to lock the pressure setting.
For H
2
O MIST Shield:
a. Turn the Water Mist Control Knob to adjust pressure.
b. Push the knob back in to lock the pressure setting.
NOTE
Unless the installation includes gas selection equipment between the gas supplies and the control
console, switching between gases requires disconnecting the gas supply line(s) from the control con-
sole rear panel and connecting the appropriate input gases. Water input can remain connected perma-
nently because the shield selector switch disables and enables the flow of water for H
2
O Mist shield.
4. Place the RUN/SET switch to the RUN position.