ABB ACS280 Firmware Manual page 41

Note: Speed controller autotuning works only, when the speed stays within a
specific window during the sequence:
• Speed is max 90% of the motor nominal speed or max speed (group 30
limits), which ever is smaller.
• Speed is min 10% of the motor nominal speed or minimum speed (group 30
limits), which ever is bigger.
Autotune modes
Autotuning can be performed in three different ways depending on the setting
25.34
of parameter
drive torque reference should react to a speed reference step after tuning. The
Smooth
selection
fast response but possibly too high gain values for some applications. The
figure below shows speed responses at a speed reference step (typically
1...20%).
n
%
n
N
A
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
D: Overcompensated speed controller
Smooth
. The selections
will produce a slow but robust response;
B
Program features 41
Normal Tight
, and
Tight
C D
define how the
will produce a
t