ABB ACS880-04XT User Manual

84 Program features
The figure below is a simplified block diagram of the speed controller. The controller
output is the reference for the torque controller.
Warning indications
A warning message, AF90 Speed controller autotuning, will be generated if the
autotune routine does not complete successfully. See chapter Fault tracing (page
565) for further information.
Settings
Parameters 25.33…25.40 (page 277).
 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 26.53 Oscillation compensation input. The oscillation
damping function outputs a sine wave (26.58 Oscillation damping output) which can
be summed with the torque reference with a suitable gain (26.57 Oscillation damping
gain) and phase shift (26.56 Oscillation damping phase).
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.
Derivative
Proportional,
integral
Derivative
acceleration
compensation
Torq ue
reference
Speed
reference
Actual speed
Error
value
-
+
+
+
+

ABB ACS880-04XT Specifications

General

Brand	ABB
Model	ACS880-04XT
Category	Controller
Language	English