Tweco 200 XT Auto-Cut 400V - Manual (Page 53)

AUTO-CUT 200 XT
Manual 0-5284 OPERATION 4-7
3. Set Gas Pressures
a. Place RUN/SET switch in SET mode.
b. Adjust plasma and shield pressure regulators to correct pressure or correct flow if using H
2
O Mist option.
(refer to cut chart manual for required pressure/flow.)
c. Return RUN/SET switch to RUN mode. Attempting to START while in the SET mode will cause fault
L303, normally indicating low gas pressure but in Auto-Cut XT units also indicates trying to START while
in SET.
4. Set cutting current.
a. Adjust the Current Control knob to the required output current on the 4 digit display.
5. Prepare to cut.
a. Protect your eyes and ears.
b. Position the Torch to the proper transfer distance above the work piece.
6. Apply START.
• Gas indicator lights; Gas pre-flow starts.
• During gas pre-flow power supply is enabled. DC lamp turns ON.
7. Pilot Arc
• At the end of pre-flow, ignition occurs (arcstarter fires) and the Pilot Arc is established.
8. Transfer
• Almost immediately, if the torch is positioned correctly, the pilot arc transfers to the work and becomes
a cutting (transferred) arc.
• Current quickly ramps up to the level set by the Current Control and the arc pierces through the metal.
• OK to Move signal becomes active and the torch is moved to perform the cut.
9. End of Cut
• START signal is removed; current ramps down and the arc goes out.
• Gases continue to flow for the selected Post-flow time then stops.
• Pump will run for 4 minutes then shut off. Fan will remain on as long as power is on.
10. To make another cut repeat steps 5-9. A second cut can be started anytime after completing the first cut.
11. Shut off the system.
a. Set the ON/OFF power switch on the front panel of the unit to OFF.
Warning!
AC power is still present inside the unit.
• Fans and pump as well as all indicators turn off.
• The display may show a fault code for a moment, this is a normal part of shutting off power and does
not indicate a fault.
b. Open (turn off) the main power disconnect. All power is now removed from the unit.
• Rear panel AC indicator turns OFF.
Operational Suggestions
1. Wait four minutes before setting the ON/OFF switch to OFF after operation. This allows the cooling fans to run
to dissipate operating heat from the power supply.
2. For maximum parts life, do not operate the pilot arc any longer than necessary.