Motor Power Company DUET_FL 48/10, User Manual

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Speed-controlled mode
To activate the speed-controlled mode, the Commands windows has to be configured as follows:
For information on how to configure the setpoints in this operating mode see chapter 4.2
Setpoint assignment through setpoint selectors .
4.1.1 Optimizing the speed controller
To optimize the speed controller for your application, you can open the menu for configuring the
controller parameters under
Parameters/Controller parameters/Speed controller .
In this menu, you can configure the Gain and the Time constant for the PI controller.
To optimize the control response, the measured actual speed value has to be smoothed. This is done
using an
Actual speed filter . The effective filter time constant can be parametrized:
If the time constant of the actual speed value filter is too high, the dynamic response
deteriorates as disturbances are detected with a delay. In certain unfavourable cases, a
too high time constant can have a negative effect on the stability of the speed control
circuit. The additional run time may lead to oscillations.
If the time constant is too low and gain factors are high, you will hear current noise in the
speed controller and notice a slight unsteadiness of the shaft. In addition the motor will
heat up more strongly.
Set the time constant as low as possible for reasons of stability. The downward limit is the
noise. Typical values for the actual speed filter are 0.6 ms to 2.0 ms.
The speed controller has to be adjusted such that there is only one overshoot of the actual speed
value. The overshoot should be about 15% higher than the set speed. The falling edge of the
overshoot, however, should not be below the speed setpoint or just slightly below it and then reach the
User Manual DUET_FL „DUET_FL 48/10“ Version 1.1 Motor Power Company