Oscillation Damping - ABB ACS880 Series Firmware Manual

The figure below is a simplified block diagram of the speed controller. The controller
output is the reference for the torque controller.
Speed
reference
Actual speed
Warning indications
A warning message,
autotune routine does not complete successfully. See chapter
469) for further information.
Settings
Parameters 25.33...25.40


Oscillation damping

The oscillation damping function can be used to cancel out oscillations caused by
mechanics or an oscillating DC voltage. The input – a signal reflecting the oscillation
– is selected by parameter
damping function outputs a sine wave
be summed with the torque reference with a suitable gain
gain) and phase shift
The oscillation damping algorithm can be activated without connecting the output to
the reference chain, which makes it possible to compare the input and output of the
function and make further adjustments before applying the result.
+ Error
-
value
AF90 Speed controller
(page 231).
26.53 Oscillation compensation
(26.58 Oscillation damping
(26.56 Oscillation damping
Derivative
acceleration
compensation
Proportional,
integral
+
Derivative
autotuning, will be generated if the
Fault tracing
input. The oscillation
(26.57 Oscillation damping
phase).
Program features 49
+
Torque
reference
+
(page
output) which can