Danfoss MCO 305 Design Manual page 130

MCO 305 Design Guide
__ APOSS Tools __
Curve Properties: Axis
Min Height
The Y-axis of the chart is normally scaled so that the
entire curve can be drawn on the chart. However,
this scaling cannot be determined in a way that will
produce easily readable grid labels when the curve
has a constant value or changes by only a very
small amount. In these cases, the Min Height value
is used as the minimum height of the Y-axis (i.e. the
magnitude of the range of the Y-axis).
Scaling
If scaling is set to Automatic, then the Y-axis of the chart will be automatically scaled so that the entire
curve can be drawn on the chart with maximum detail. The Y-axis range will be set to approximately 10%
higher than the maximum value of the curve and 10% lower than the minimum value of the curve (and
adjusted for the Minimum Height described above).
If scaling is set to User defined, then the user must specify the range of the Y-axis in the supplied boxes.
Note that this will be automatically adjusted if the Center zero when reset option is enabled (see below).
The Y-axis scale defined here (i.e. either Automatic or User defined) will be the scale used for the curve
when Reset zoom toolbar button is pressed. Note that if the scaling is changed, then the new scaling will
not take effect until the next time that the user presses the Reset zoom toolbar button.
Zero
If Center zero when reset is enabled, then the Y-axis range for the curve will be adjusted so that it is
symmetric about 0. This will result in the "0" grid line being drawn through the center of the chart.
If Display zero mark is enabled, then a small
triangular mark will be drawn on the left side of the
chart at the position of the 0 grid line for that curve.
It will be drawn in the same color as the curve so
that marks can be distinguished if marks are being
drawn for multiple curves. The following figure
illustrates these zero marks.
Share
In some cases, it is desirable to have two or more curves "share" the same Y-axis. For example, an "actual
position" curve and a "commanded position" curve will be measured using the same units and should be
displayed using the same scale in the Chart Window.
This can be done by enabling Share and choosing the "other" curve from the list of curves provided. This
curve will then share the same Y-axis as the chosen "other" curve.
Sharing a Y-axis can also be done using the radio buttons in the Grid column of the "Curve Selection List".
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