Hypertherm SensorOHC - Manual (Page 7)

Section 1: Overview 3
Section 1: Overview
Introduction
One of the most important parameters in Oxy Torch cutting is consistent torch tip to plate standoff
distance. The Hypertherm Sensor OHC uses a capacitive sensor to measure the torch to plate
distance. The unit will drive a DC motor on the torch lifter to automatically maintain a user
selected torch to plate distance. This automatic closed loop control of the torch height will
dramatically improve the cutting speed, quality and consistency.
The Sensor OHC includes the control unit, the capacitive sensor, sensor mounting isolator,
sensor spring style breakaway, and standard 1 meter coax cable. A connector kit is available for
the standard mating connectors. For demonstration purposes, a connector conversion kit is
available that will make the unit plug compatible with the Burny AR 300/100 “Levitator Clearance
Controller”.
It is the installer’s responsibility to provide a compatible lifter mechanism. A compatible lifter will
utilize a 24Vdc motor between 2 Amps, 50 Watts and 6 Amps 150 Watts. The full speed
operation must be geared to produce a linear full speed of between 20 in/ min (500 mm/min) and
140 in/min (3500 mm/min). The tradeoff being between a low speed extremely high accuracy lifter
and a high speed lower accuracy lifter. The lifter should have adequate rigidity and very little
backlash and moving inertia. The lifter should also have normally closed upper and lower limit
switches mounted at the extremes of travel.
The installer must also provide an appropriate mounting clamp that will attach the 20 mm
diameter sensor mounting isolator to the torch. The mounting clamp should be designed for a
center of torch to center of isolator distance of 2 inches or 50mm so that that the sensor ring will
be properly centered and positioned around the torch tip. Additionally, the mounting clamp
should provide a good electrical ground connection to the overall machine frame and to the metal
plate being sensed. Failure to provide an adequate ground connection to the plate will have a
negative effect on the height measurement and control accuracy.
Main Power Supply:
24Vac +/- 10%, 50, 60 Hz
Compatible Lifter Motors
DC shunt, 24Vdc, 2 Amps to 6 Amps
Max Power Output
150 Watts