144 Program features
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
). In Autotune run, the speed controller is tuned based on 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%).
The figure below is a simplified block diagram of the speed controller. The controller
output is the reference for the torque controller.
Note:
The speed controller can be used in vector control, ie, when
setting is
or
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
D: Overcompensated speed controller
(%)
n
C
B
D
n
N
A
t
Derivative
Proportional,
integral
Derivative
acceleration
compensation
Torque
reference
Speed
reference
Calculated actual speed
Error
value
-
+
+
+
+
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...