Speed Controller Tuning; Settings; Diagnostics - ABB ACS350 User Manual

Speed controller tuning

It is possible to manually adjust the controller gain, integration time and derivation
time, or let the drive perform a separate speed controller Autotune Run (parameter
2305
the load and inertia of the motor and the machine. The figure below shows speed
responses at a speed reference step (typically, 1 to 20%).
n
n
N
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
D: Overcompensated speed controller
The figure below 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 groups

Diagnostics

Actual signal
AUTOTUNE RUN). In Autotune Run, the speed controller is tuned based on
(%)
A
Error
+
-
value
23 SPEED CONTROL
0102 SPEED
C
B
Derivative
acceleration
compensation
Proportional,
integral
Derivative
and
D
t
+
Torque
+
+ reference
20 LIMITS
113
Program features