Parameters 195
24.12
Speed error filter time
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.
0 ms
0…10000 ms
Speed error filtering time constant. 0 = filtering disabled.
1 = 1 ms
25
25 Speed control
Speed controller settings.
See the control chain diagram on page
502.
25.01
Torque reference
speed control
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.
-
-1600.0…1600.0%
Limited speed controller output torque.
See par.
46.03
25.02
Speed proportional
gain
Defines the proportional gain (K
p
) of the speed controller.
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.
10.00
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.
0.00 …250.00
Proportional gain for speed controller.
100 = 1
No.
Name/Value
Description
Default
FbEq 16
Gain = K
p
= 1
T
I
= Integration time = 0
T
D
= Derivation time = 0
%
Controller
output = K
p
× e
Time
e = Error value
Controller output
Error value
ACS380 FW.book Page 195 Friday, May 4, 2018 4:18 PM
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