Speed Control - ABB ACS380 Firmware Manual

ACS380 FW.book Page 195 Friday, May 4, 2018 4:18 PM
No. Name/Value
24.12 Speed error filter time
0...10000 ms
25

25 Speed control

25.01 Torque reference
speed control
-1600.0...1600.0%
25.02 Speed proportional
gain
output = K
0.00 ...250.00
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Description
Defines the time constant of the speed error low-pass
filter.
If the used speed reference changes rapidly, the possible
interferences in the speed measurement can be filtered
with the speed error filter. Reducing the ripple with this
filter may cause speed controller tuning problems. A long
filter time constant and fast acceleration time contradict
one another. A very long filter time results in unstable
control.
Speed error filtering time constant. 0 = filtering disabled.
Speed controller settings.
See the control chain diagram on page
Displays the speed controller output that is transferred to
the torque controller. See the control chain diagram on
page 502.
This parameter is read-only.
Limited speed controller output torque.
Defines the proportional gain (K
Too high a gain may cause speed oscillation. The figure
below shows the speed controller output after an error
step when the error remains constant.
%
Error value
Controller output
Controller
× e
p
If gain is set to 1, a 10% change in error value (reference -
actual value) causes the speed controller output to
change by 10%, ie. the output value is input × gain.
Proportional gain for speed controller.
Parameters
502.
) of the speed controller.
p
Gain = K = 1
p
T = Integration time = 0
I
T = Derivation time = 0
D
e = Error value
Time
195
Default
FbEq 16
0 ms
1 = 1 ms
-
See par.
46.03
10.00
100 = 1