ABB ACS355 series, User Manual

Page: 237 / 436

Actual signals and parameters 237
2302 INTEGRATION
TIME
Defines an integration time for the speed controller. The
integration time defines the rate at which the controller
output changes when the error value is constant. The
shorter the integration time, the faster the continuous error
value is corrected. Too short an integration time makes the
control unstable.
The figure below shows the speed controller output after an
error step when the error remains constant.
Note: For automatic setting of the integration time, use
autotune run (parameter 2305 AUTOTUNE RUN ).
0.50 s
0.00…600.00 s Time 1 = 0.01 s
All parameters
No.
Name/Value Description Def/FbEq
Gain = K
p
= 1
T
I
= Integration time > 0
T
D
= Derivation time = 0
e = Error value
Controller output
K
p
· e
K
p
· e
%
t
T
I