Danfoss MCO 305 Design Manual page 72

MCO 305 Design Guide
Offline Mode: Managing the CNF File
Use the functions of MCT 10 Motion Control Tool for New, Load and Save CNF as.
Save CNF: The current data is saved as a CNF file, overwriting the previous version of the file (i.e. stores
them back into the MCT 10 database).
CAM Profile
The curve profile section of the CAM-Editor window gives a graphic illustration of the curve, parameters and
other information in the curve profile. You are also able to interactively modify and insert the Fix points with
the mouse and to enlarge the illustration. A toolbar is available in the upper-left portion of the window and
provides other curve-related functions.
A blue header shows the curve name and the file name of the displayed curve.
Fix points can be inserted, deleted, or moved interactively with the mouse using a context menu that will
display by double click. Please use the online help for more details.
How to Change the Point Type in the Diagram
In the curve profile diagram, curve points are
shown in green and tangent points in blue. Move
the mouse cursor to a fixpoint until the hand icon
appears and click on the right mouse button. In the
following context menu, select Change Type:
If the selected point is a curve point, then both it and the previous point (to the left) are changed to
tangent points. If the selected point is a tangent point, then both it and the point at the other end of the
tangent segment are changed to curve points.
How to Zoom or Scroll CAM Profiles
The function follows the Windows specification. Please read the online help for more details.
Curve Profile Toolbar
The Curve Profile window contains the following toolbar: From left to right:
Zoom Reset,
Import / Export ASCII (Please read the online help for more details.)
Using Fix Points
Fix points are used to define the basic shape of the curve over the length of the master cycle. The CAM-
Editor will fit a mathematical spline through these Fix points in order to create a smooth curve. This spline is
then approximated using many small straight line segments and these line segments are the final result
which the controller will use. The line segments are created using a uniform interpolation grid that is
determined by the user-specified number of interpolation points.
The master cycle needs to fit exactly onto the interpolation grid so that a whole number of interpolation
intervals can be used. Hence, the master cycle length needs to be a multiple of the number of interpolation
intervals. Otherwise, numerical errors may cause unexpected behavior. It is recommended that the master
cycle length be a value of at least four digits.
The number of interpolation intervals must be large enough so that the curve can be approximated with
reasonable accuracy. However, it must also not be so large that the controller begins to have performance
problems as a result too many very small segments. The "Interval Time" (found on the Curve Info index
card) should not be smaller than 20-30 ms.
When a new curve is created, it will be initially being created with only two Fix points. Additional Fix points
can then be added either using the Fix points table or using the mouse in the curve profile diagram. Fix
points should always lie on the interpolation grid, so you should always activate
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__ PC Software Interface __
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