ABB ACS880 Firmware Manual page 272

272 Parameters
No. Name/Value
25.06 Acc comp derivation
time
0.00 ... 1000.00 s
25.07 Acc comp filter time
0.0 ... 1000.0 ms
Description
Defines the derivation time for acceleration(/deceleration)
compensation. In order to compensate for a high inertia load
during acceleration, a derivative of the reference is added to
the output of the speed controller. The principle of a
derivative action is described under parameter
derivation time.
Note: As a general rule, set this parameter to the value
between 50 and 100% of the sum of the mechanical time
constants of the motor and the driven machine.
The figure below shows the speed responses when a high
inertia load is accelerated along a ramp.
In winder control, signal
is used as acceleration compensation value. This parameter
cannot be changed manually.
No acceleration compensation:
%
Acceleration compensation:
%
Acceleration compensation derivation time.
Defines the acceleration (or deceleration) compensation
filter time constant. See parameters
time and 25.06 Acc comp derivation time.
Acceleration/deceleration compensation filter time.
25.04 Speed
09.44 Inertia compensation torque
Speed reference
Actual speed
Time
Speed reference
Actual speed
Time
25.04 Speed derivation
Def/FbEq16
0.00 s
10 = 1 s
8.0 ms
1 = 1 ms