ABB ACS880 Firmware Manual page 232

232 Parameters
No. Name/Value
40.33 Set 1 integration
time
0.0 ... 32767.0 s
40.34 Set 1 derivation
time
0.000 ... 10.000 s
40.35 Set 1 derivation
filter time
0.0 ... 10.0 s
Description
Defines the integration time for the process PID controller.
This time needs to be set to the same order of magnitude as
the reaction time of the process being controlled, otherwise
instability will result.
Error/Controller output
G × I
G × I
Ti
I = controller input (error)
O = controller output
G = gain
Ti = integration time
Note: Setting this value to 0 disables the "I" part, turning the
PID controller into a PD controller.
Integration time.
Defines the derivation time of the process PID controller. The
derivative component at the controller output is calculated on
basis of two consecutive error values (E
to the following formula:
PID DERIV TIME × (E
K
T = 2 ms sample time
S
E = Error = Process reference - process feedback.
Derivation time.
Defines the time constant of the 1-pole filter used to smooth
the derivative component of the process PID controller.
%
Unfiltered signal
100
63
Filtered signal
T
-t/T
O = I × (1 - e
I = filter input (step)
O = filter output
t = time
T = filter time constant
Filter time constant.
O
I
Time
and E
K-1
- E )/T , in which
K-1 S
t
)
Def/FbEq16
60.0 s
1 = 1 s
0.000 s
) according
K
1000 = 1 s
0.0 s
10 = 1 s