Testrun" Menu; Setting Parameters For A "Testrun - Danfoss VLT 5000 Series Manual

I I I I I "TESTRUN" menu
The "TESTRUN" menu offers the functions
"EXECUTE TESTRUN" from the entry of the test
run parameters up to the graphic representation of
the test run results.
If you have used TESTSETP to define a test run
with different parameters, you can also graphically
display these results after execution (TESTSTART)
with "TESTRUN" → "DISPLAY RECORDING".
In order to correctly set the controller parameters it
is important to choose the correct test parameters.
I I I I I Setting parameters for a test run
Click on "TESTRUN" → "EXECUTE TESTRUN"
and enter the test run parameters in the dialog
field:
If possible only change one parameter per
measurement and check the effect this has.
Path of motion
Set the path of motion in user units and utilize the
entire duration of the measurement as well as
possible:
The number of measurement points multiplied by
the time difference between two measurements
result in the entire duration of measurement and
thus determines the graph. For an optimal evalua-
tion of the figures the path of motion should be
selected so that the end position is reached after
approximately 80% of the entire recording time.
Thus vibrations at the target position are easily
recognizable.
Example:
50 measurements in intervals of 30 ms = 1.5 sec
recording time.
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VLT 5000 SyncPos option
Velocity, acceleration and deceleration
The test run parameters of velocity, acceleration
and deceleration are entered in percent of the
respective maximum value.
Complete the measurements with the values most
often needed for the controller for velocity, accele-
ration and deceleration.
In order to be able to evaluate the vibration beha-
vior of the final velocity you should try to achieve a
trapeze-shaped velocity course. For this it may be
necessary to increase the sampling interval or re-
duce the final velocity.
NB!
Before you start to optimize the control be-
havior, check whether the maximum velocity
and the maximum acceleration have been
achieved.
Number of readings
The number of samples and the sample interval
determine the entire duration of the measurement.
50 to 100 measurement points are sufficient for an
optimal graph.
The number of maximum possible measurement
points is limited by the internal memory of the
SyncPos option and also by any programs that are
stored there. If the memory is not sufficient for the
desired number of samples then it is necessary to
delete the programs stored in the SyncPos option
with "CONTROLLER" → "PROGRAMS" →
"DELETE ALL".
Data sampling interval
Select a sampling interval which is suitable for the
system and for the frequency converter, for examp-
le 20 to 30 ms.
For dynamic applications the sampling interval can
be decreased to 1 ms. The shortest possible
sampling interval should be set for servo-motors.
Naturally, to record slower or very long motion pro-
cesses the time difference in milliseconds can be
increased, however the maximum is 255 milli-
seconds.
NB!
The sampling interval mentioned here is the
internal between measurements, not the
controller sample interval.
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