Danfoss VLT Series Programming Manual page 139

Operation with ISD Toolbox
button to save the file. The Save error history button is
disabled until the error history is read for the first time.
5.7.6 Digital CAM Switch (Servo Drive only)
The Digital CAM Switch sub-tool is used to create and
visualize digital CAM switch configurations, import and
export them to .dcs files, and transfer and activate them to
ISD servo drives. Illustration 5.46 gives an overview of the
Digital CAM Switch sub-tool.
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1 Plot area
2 Simulation controls
3 Run controls
4 Switch definitions table
5 Status area
6 Display area
7 Parameters area
Illustration 5.46 Digital CAM Switch Sub-tool
The Parameters area contains the global switch configu-
ration. It consists of the parameters Unit (User or
Revolutions), On compensation, Off compensation, and
Hysteresis. The On compensation and Off compensation
values are given in milliseconds. Depending on the
selected unit, the Hysteresis value is interpreted either as
user-defined units or as revolutions. The Hysteresis field
contains 3 decimal places that are only evaluated if the
selected unit is Revolutions. If the selected unit is User,
then only the integer part of the Hysteresis value is taken
into account.
The switch definitions table contains all switches that build
up the configuration. Every switch entry consists of the
fields Switch mode (position or time), First On Position, and
Axis Direction (positive, negative, or both).
When using switch mode position, set the Last On Position
parameter. When using the switch mode time, set the
Duration (ms) parameter. Depending on the selected unit
in the parameters area, the First On Position and Last On
MG36D102
Programming Guide
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Position parameters are interpreted either as user-defined
units (User) or as Revolutions.
The State Simulation and Display controls are used only for
visualization purposes and have no effect on the digital
CAM switch configuration. The horizontal plot area range is
set according to the values in the simulation fields Min Pos
Range Limit and Max Pos Range Limit. Depending on the
field Current velocity (rpm), the length of time switches in
position units is calculated and visualized.
In the Display area, the checkboxes Display Positive and
Display Negative control if the switches in positive and
negative direction are visualized in the plot area.
The plot area graphically visualizes the digital CAM switch
definition. The horizontal plot range is defined by the
simulation parameters Min Pos Range Limit and Max Pos
Range Limit. The vertical plot axis is discrete, with values
indicating if the digital output is inactive (0) or active (1) at
any position within the plot range, given the specified
simulation velocity. Switches in positive direction are
visualized by a light blue line and switches in negative
range are visualized using a thin red line. For switches that
are defined in both directions, both a positive and a
negative visualization is made. By enabling or disabling the
visualization in positive or negative direction using the
checkboxes in the Display area, it is possible to visually
isolate and observe the resulting digital output value when
the servo drive is running in either a positive or negative
direction.
The Run controls can only be used for online servo drives.
The Send to drive button saves the digital CAM switch
configuration to a temporary file and then transmits it to
the servo drive using the file transfer protocol that is
available on the current fieldbus. The Activate button sends
an activation command to the servo drive.
The Status area can only be used for online servo drives. It
shows the actual status of the digital CAM switch
functionality on the servo drive. It contains the read-only
checkboxes Active, Valid, and Error, corresponding to the
active, valid, and error bits in the digital CAM switch
parsing state object. If an error occurs, the corresponding
error text is shown in the read-only text field in the Status
area. The status can only be manually updated using an
SDO transfer, which can be triggered by using the Update
button.
The Digital CAM Switch sub-tool can save and load digital
CAM switch configurations using the save and load
buttons in the toolbar.
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