Calibration, Foot sensor up input, Initial height sense (ihs) – Hypertherm V9 Series Phoenix Rev.11 User Manual
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Phoenix 9.76.0 Installation and Setup Manual 806410
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16 – Waterjet Application
Calibration
The waterjet height control calibration feature provides the CNC with the voltage input at different height increments. To
begin calibration, choose Setups > Process > Calibrate WHS. The CNC lowers the height sensing device to the
workpiece surface, then moves it up from the workpiece in increments and measures the voltage at each increment. The
CNC then calculates the height at different voltages and uses this information to control cutting height. Perform
calibration whenever you change the waterjet nozzle to a different length.
Foot Sensor Up input
The CNC provides an input called Foot Sensor Up which activates when the height control device is fully retracted from
the workpiece surface. When this input activates, the CNC prevents waterjet height control calibration, use of the test
lifter routine (waterjet initial height sense), running of a part program, or rip cutting. Blocking motion when Foot Sensor Up
is activated protects the waterjet nozzle from damage that could occur if it contacts the workpiece surface.
Initial height sense (IHS)
Waterjet height control uses a sequence called initial height sense, or IHS, for detecting the workpiece. You perform a
first IHS after
powering up the cutting system and before each cutting job. A first IHS detects the location of the
workpiece so that the CNC can calculate the cut height. The CNC uses the cut height for all subsequent IHSs, which it
can perform using much faster speeds since the position of the workpiece surface is known.
Be sure you have performed the waterjet height control calibration before performing the first IHS.
The IHS begins at the IHS Start Height set in the Setups > Process screen. When the cutting head reaches this
distance above the workpiece the following actions occur:
Speed slows from Maximum THC Speed to Fast IHS Speed.
The CNC monitors the incoming analog voltage from the height control until it reads 0 V.
After the CNC determines the height of the workpiece, it moves the cutting head to the Cut Height at the Slow IHS
Speed.