37
Rev. 1.0
0006302011
SSM24C User Manual
+86-400-820-9661
5.7.1 Setting up Auto Trigger
When using
Auto Trigger
, the primary effort is to 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
is not monitored.
In the Auto Trigger tab the displayed text will indicate the value to be used and the conditions to
trigger the capture of the selected value. In the example to the right, 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 conditions 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 SSM 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 Quick Tuner monitors the status of the SSM 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 more dynamic
adjustment of the gains for speeding up the tuning process
NOTE: When adjusting control loop gain values remember that the FF Term (KK) has no
effect when operating in the Position – Pulse & Direction Control Mode.
5.8 Setting the Notch filter
The notch filter is used when there is a specific resonate frequency present in the system and
good performance requires that only the “bad” frequency be removed. Sometimes the resonate
frequency is low enough that it should only be removed using the notch filter. Using the standard
output filter or reducing the gain settings may compromise the system performance too much.
When performing the move profiles as discussed above, a significant resonate frequency may be
experienced visually on the plot window, audibly, or both. Finding this frequency can be a difficult
task and it is often discovered by experimentation. Change the frequency then perform sampling
moves until the resonance is reduced or removed. Keeping the bandwidth wide (maybe equal to
the center frequency) may help find the center frequency. When the center is found, the bandwidth
may be reduced until the resonance starts to return.
