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46 Program features
Autotune modes
Autotuning can be performed in three different ways depending on the setting of
parameter
Speed controller autotune mode
. The selections
and
define how the drive torque reference should react to a speed reference
step after tuning. The selection
will produce a slow but robust response;
will produce a 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%).
Autotune results
At the end of a successful autotune routine, its results are automatically transferred
into parameters
•
(proportional gain of the speed controller)
•
(integration time of the speed controller)
•
(mechanical time constant of the motor and
machine).
Nevertheless, it is still possible to manually adjust the controller gain, integration time
and derivation time.
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
D: Overcompensated speed controller
%
t
n
C
B
D
n
N
A
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...