Tweco 300 Ultra-Cut(March 2013) - Manual (Page 83)

Manual No. 0-5134 4-13 OPERATION
ULTRA-CUT 300
10. Changing torch consumables:
Following a consumables change or inspection the system will initiate a purge of the gas. This serves two
purposes:
a) Remove the coolant that gets into the consumables when they have been removed.
b) If the gas type has changed “Purge” removes the old gas from the lines and replaces it with the new
gas. If the gas type has changed from a fuel gas like H35 to an oxidizing gas like oxygen or air the purge
inserts a buffer of inert gas, nitrogen, so the H35 and oxygen don’t mix.
You can change consumables by removing power or using the “Plasma Disable” SW.
If you remove power the system does not remember what gasses were last used so it will do a complete purge
including nitrogen buffer even if you do not change gas types.
With “Plasma Disable” the system remembers what was used last and does only the amount of purge neces-
sary possibly saving time.
11. Use “Plasma Disable”.
a) You may use the Plasma Disable when removing the torch cartridge to change or inspect consumables.
Plasma disable stops coolant pump, shuts off all gas solenoids, removes power from the inverter (power
supply) and pilot circuits, inhibits the arc starter ignition (HF) circuit. It does not remove power from
the TSC 3000 or the systems logic and communications circuits so you do not need to go through as long
a power up process after replacing the consumables.
b) If changing to a process with a different gas type you may want to select it before enabling the plasma
otherwise it will start purging the old process and when you do select the new one it will purge again
taking more time.
c) If you are not changing gas type you may want to turn on the Enable first to start the purge while you
enter the process.
12. Shutting off power.
a) If you chose to shut off power for inspecting or changing consumables, or any other purpose, the system
does not remember what you were doing last so you will have to go through the complete sequence from
the beginning starting with step 1.