Tweco XTTM-300 - Manual (Page 41)

Manual 0-2912 4B-3 Operation with 5-Knob Automatic Gas Console
NOTE
This information represents realistic expectations using recommended practices and well-maintained systems. Ac-
tual speeds may vary from those shown in the charts depending on the alloy content of the selected material.
Refer to Section 3C for information for the HD3070 System with an automatic gas control with 6 control knobs.
** - Arc voltage is based on 50 ft (15.2 m) torch lead length. For other lead lengths the operator may need to adjust
the Arc Voltage setting. Refer to Appendix 1 for Alternate Arc Voltage Settings.
NOTE: The preflow rates shown generate increased dross at the start of a cut. Increasing the amount of oxygen and
reducing the amount of nitrogen will reduce dross at the start of a cut, but will also reduce electrode life.
Oxygen (O
2
) gas inlet pressures must be 120 psi (8.3 bar) for all material thicknesses.
Slightly increasing the preflow flow rates may increase piercing capability on the thicker materials listed above.
However, increasing the preflow flow rates too much may affect plasma starting reliability (misfiring).
Torch Working Height tolerances are ±0.005 inch (±0.125 mm).
Thermal Dynamics Pre-Charge Unit must be installed before cutting.
Chart gives set-up parameters for use with a Hypertherm HD 3070 System. For technical and legal reasons the
settings in the chart may not be appropriate for use with other systems.