Parameters 171
25.06 Acc comp
derivation time
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 25.04 Speed 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.
No acceleration compensation:
Acceleration compensation:
0.00 s
0.00 … 1000.00 s Acceleration compensation derivation time. 10 = 1 s
25.07 Acc comp filter time Defines the acceleration (or deceleration) compensation filter
time constant. See parameters 25.04 Speed derivation time
and 25.06 Acc comp derivation time.
8.0 ms
0.0 … 1000.0 ms Acceleration/deceleration compensation filter time. 1 = 1 ms
No. Name/Value Description Def/FbEq16
Time
%
Speed reference
Actual speed
Time
%
Speed reference
Actual speed
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