Speed Controller Tuning; Settings; Diagnostics - ABB ACS800 Firmware Manual

Speed controller tuning

During the motor identification, the speed controller is automatically tuned. It is,
however, possible to manually adjust the controller gain, integration time and
derivation time, or let the drive perform a separate speed controller Autotune Run. In
Autotune Run, the speed controller is tuned based on the load and inertia of the
motor and the machine. The following figure shows speed responses at a speed
reference step (typically, 1 to 20%).
n
n
N
The following figure is a simplified block diagram of the speed controller. The
controller output is the reference for the torque controller.
Speed
reference
Calculated actual speed

Settings

Parameter group

Diagnostics

Actual signal 01.02.
%
A
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
D: Overcompensated speed controller
Error
+
-
value
23 SPEED CTRL
C
B
Derivative
acceleration
compensation
Proportional,
integral
Derivative
and 20 LIMITS.
D
t
+
Torque
+
+ reference
Program features
71