Danfoss MCO 305 Design Manual page 68

MCO 305 Design Guide
Complete the measurements with the values most often needed for the controller for velocity, acceleration
and deceleration.
In order to be able to evaluate the vibration behavior 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 reduce the
final velocity.
NB!:
Before you start to optimize the control behavior, check whether the maximum velocity and the
maximum acceleration have been achieved.
Sampling Number
The number of readings 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 MCO 305
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 option board with Controller
Delete all.
Sampling Interval
Select a data sampling interval which is suitable for the system and for the frequency converter, for
example 20 to 30 ms.
For dynamic applications the sampling interval can be decreased to 1 ms; for servo-motors the shortest
possible sampling interval should be set.
Naturally, to record slower or very long motion processes the time difference in milliseconds can be increa-
sed, however the maximum is 255 milliseconds.
NB!:
The sampling interval mentioned here is the internal between measurements, not the controller
sample interval.
Execute Testrun
Before Starting a Testrun: Safety Notes
Move the drive to the starting position; it is important to do this before you open the test window.
NB!:
While optimizing the controller with the function Testrun the drive is automatically returned to the
starting position after reaching the target position.
If run in reverse is not allowed, then the par. 32-68 Reverse Behavior for Slave must be set to "no rever-
sing" = [2].
Click on Controller Parameters
NB!:
Make sure that any and all brakes are released and that there are not any obstacles in the
positioning path.
Improperly adjusted controller parameters can cause the motor and the mechanism to be
damaged. For this reason never optimize controls without having an EMERGENCY STOP button.
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__ PC Software Interface __
Axis and change the setting in the parameter group PID Controller.
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