Hypertherm Phoenix 8.0 - Manual (Page 379)

Password Setups
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Axes -- CBH
The following setup screen is available if the CNC is configured for a Contour Bevel
Head.
The definitions for the setup parameters are the same as for the Transverse/Rail Axes,
with the exception of Absolute Home Angle and Home Offset Angle. These two setup
parameters serve the same basic function as previously described but are measured in
degrees of rotation rather than inches or millimeters. However, the number of selections
are reduced as these parameters are not used with a Contour Bevel Head.
Proportional Gain
Proportional Gain correlates to Elastic Stiffness in the control loop. Increasing the
proportional gain increases the static stiffness, but decreases response of the servo loop.
Under proportional loop control, the drive system will apply a restoring torque to the
motor in proportion the position error of the axis.
With a Proportional Gain too high, the system will be unstable which will result in
overshoots and a generally “nervous” and shaky axis. This is also referred to as a “hot”
control loop.