Hypertherm Phoenix 8.0 - Manual (Page 418)

Sensor THC
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Sensor THC
Overview
Sensor THC (Torch Height Control) system is designed for use with your shape cutting
control. Sensor THC utilizes the most current technology available to provide superior
plasma cut performance.
During the plasma cut process, variations in the distance between the torch tip and the cut
material affect the cutting arc voltage and ultimately, the quality of the cut. An
automated torch height control maintains the appropriate cut height for the set arc voltage
to obtain the optimum cut quality regardless of variations in plate positioning.
Sensor THC is operated as a separate closed-loop servo axis on the control and has
several setup parameters available to customize the system for optimal performance and
individual requirements. The THC system includes four parts: the control, the analog
input card mounted in the control, the voltage divider card and the mechanical slide with
a motor to operate the slide. The voltage divider card, which is mounted in the plasma
power supply, monitors the arc voltage of the cutting process at the torch then transmits
1/40
th
of this voltage to the analog input card in the control where it is restored to the
original value. This value is then compared to the value of the Set Arc Voltage field. If
the values are different, the control will raise or lower the torch on the slide to correct the
cut voltage. This Appendix will highlight the features which are unique to the Sensor
THC.
For operation, this feature must first be enabled in the password machine setups. Setup
parameters specific to the cut process and the THC axis will then be available for
configuration.
Warning! Installation, Setup and Calibration should only be performed by trained
service personnel. Extreme care should be used when installing this product.