Password Setups 339
CBH
The following setup screen is available if the control 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.
With a proportional gain too low, the system will respond in a loose or sloppy manner. This can be
seen in the test pattern when the outside corners become rounded and the circle segments do not all
meet in the center.
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