ABB ACS880 Series Firmware Manual page 220

220 Parameters
No. Name/Value
24.11 Speed correction
-10000.00 ...
10000.00 rpm
24.12 Speed error filter
time
0...10000 ms
Description
Defines a speed reference correction, ie. a value added to the
existing reference between ramping and limitation. This is
useful to trim the speed if necessary, for example to adjust
draw between sections of a paper machine.
Note: For safety reasons, the correction is not applied when
an emergency stop is active.
WARNING! If the speed reference correction exceeds
21.06 Zero speed
impossible. Make sure the correction is reduced or
removed when a ramp stop is required.
See the control chain diagram on page 551.
Speed reference correction.
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.
limit, a ramp stop may be
Def/FbEq16
0.00 rpm
See par.
46.01
0 ms
1 = 1 ms