183
SV200 DC Hardware Manual
920-0126A
4/14/2017
11.4 Using Auto Trigger Sampling
In cases where an external controller is used to perform move profiles, such as in
Position
Control Mode
using
Pulse & Direction
input, the
Auto Trigger
function will allow the
Sampling
tool to collect data
and display the move profile.
This sampling technique is different in that it is not triggered by the start of a move profile as the drive cannot know when the move is
actually started (remember the controller is external). Instead, the
Auto Trigger
function waits for a predefined set of conditions, or
triggering event, before the move profile data is collected.
When using
Auto Trigger
, it’s important to first select the conditions that will trigger the sampling. Begin by selecting the desired
trigger value in the
Plot 1
list. This selection is what is monitored by the Auto Trigger;
Plot 2
will be displayed, but is not monitored
for scope triggering purposes. See below.
In the Auto Trigger tab the displayed text will indicate the value to be used and the condition that will trigger the capture of the selected
data plots. In the example above, the capture will begin when
Actual Speed
is
Above 1.000 rev/sec
, the capture will
Capture data
for
0.300 seconds
and there will be a
10% Capture delay
from the beginning of the capture to the trigger
point. The
Capture delay
allows viewing of the data prior to the trigger point so that a more complete profile can be observed.
When changing
Plot 1
to other selections notice that the units for the capture trigger will change with it. For example, when selecting
Position Error
the capture will look at
Counts
for determining the trigger point.
Sample Once:
when the
Start
button is clicked, the servo drive begins continuous collection of data. It will constantly check the
data to see if the value meets the capture trigger conditions. At the same time SVX Servo Suite monitors the status of the servo drive to
detect if the capture is complete.
When the capture is complete the data is displayed in the profile window.
Sample Continuously:
when the
Start
button is clicked, the capture is repeated each time the trigger condition is met until the
Stop
button is clicked. During continuous sampling the tuning gains can be changed at any time and will be updated automatically.
This allows for more dynamic adjustment of the gains, thereby speeding up the tuning process.
