ABB ACS880 Firmware Manual page 329

No. Name / Range /
Selection
25.6 Acc comp derivation
time
0.00 ... 1000.00 s
25.7 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
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.
No acceleration compensation:
%
Acceleration compensation:
%
Acceleration compensation derivation time.
Defines the acceleration (or deceleration)
compensation filter time constant. See parameters
25.4 Speed derivation time
derivation time.
Acceleration/deceleration compensation filter time.
25.4 Speed derivation
Speed reference
Actual speed
Time
Speed reference
Actual speed
Time
and 25.6 Acc comp
Parameters 329
Def / Type
FbEq 16b / 32b
- / real32
10 = 1 s / 100 = 1 s
8.0 ms / real32
1 = 1 ms / 10 = 1 ms