Centroid Acorn Plasma Users Manual Beta CNC12 v4.65 rev6
Torch and THC Settings.
These settings are typically in the “set it and forget it” category. Once the
proper values are determined for good cutting results it is not common to
be adjusting these values. Default values are shown in the image to the
right.
Voltage Divide Ratio: Provided by the Plasma Unit, set this value to
match. The voltage divider circuit in the Plasma Unit monitors power
supply voltage during cutting. It "divides" the voltage signal and sends a
scaled voltage signal to the Acorn THC.
Velocity Anti Dive Ratio is Velocity based Anti Dive control. Velocity
based anti-dive will prevent THC motion when the actual X-Y velocity of
the
machine is less than the specified %. Used to turn off THC automatically
when entering tight arcs or turn arounds.
Anti-Dive Threshold is Voltage based Anti Dive control. Voltage based
anti-dive will prevent THC motion when the actual Voltage of the arc
is more than the specified % (difference between Target Voltage and
Actual Voltage).
Anti-Dive Hysteresis is a control value based in time, used to damp the Anti Dive re-activeness. Larger number =
slower reaction.
THC max velocity: The maximum velocity that the Z axis can move without losing steps. Integrator should test the
machine to determine this value. Typically set to 80% of the rate in which the Z axis will begin to lose steps. In the
case of servo controlled systems that can reliably move the Z axis faster than 500 ipm, use 500 ipm as the max
velocity value for the THC.
Pierce to Cut Z Feedrate: Feedrate to move in Z from the pierce height to the cut height after piercing is finished.
Used to prevent flame outs from too quick of Z axis torch movements after piercing to get to the cut height.
THC – travel limits: Allowable maximum positive and negative distance. This distance limit becomes active
whenever the THC is active and is relative to touch off top of work piece Z value.
Touch Off Fast Probing Rate: The Speed in which the Torch will initially seek the top of the work piece in the
automatic Torch Touch Off cycle.
Touch Off Slow Probing Rate: The speed in which the Torch will seek the top of the work piece after initially finding
the top of the work piece with the Fast Rate in the automatic Torch Touch Off cycle. If any value greater than 0 the
auto touch cycle will first seek the top of the work at fast rate and then retract and use the slow rate to very
accurately locate the top of the work piece. If = 0 only the Fast rate will be used to touch off once.
Dry Run Height selection: Choose between Safe Height, Cut Height or Pierce Height
Page 26 D:\Keith Documents\centroid_acorn_plasma_users_manual_draft27.odt rev27 3-15-22
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