ABB ACS280, Firmware Manual, Page: 231 / 430

Parameters 231
40.34 Set 1 derivation 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
K-1
and E
K
) according to the following
formula:
PID DERIV TIME × (E
K
- E
K-1
)/ T
S
, in which
T
S
= 2 ms sample time
E = Error = Process reference - process feedback.
0.000 s
0.000…10.000 s Derivation time. 1000 = 1 s
40.35 Set 1 derivation filter
time
Defines the time constant of the 1-pole filter used to
smooth the derivative component of the process PID
controller.
0.0 s
0.0…10.0 s Filter time constant. 10 = 1 s
40.36 Set 1 output min
Defines the minimum limit for the process PID
controller output. Using the minimum and maximum
limits, it is possible to restrict the operation range.
0.00
-200000.00…
200000.00
Minimum limit for process PID controller output. 1 = 1
40.37 Set 1 output max
Defines the maximum limit for the process PID
controller output. See parameter
40.36 Set 1 output
min
.
100.00
-200000.00…
200000.00
Maximum limit for process PID controller output. 1 = 1
40.38 Set 1 output freeze
enable
Freezes (or defines a source that can be used to
freeze) the output of the process PID controller,
keeping the output at the value it was before freeze
was enabled. This feature can be used when, for
example, a sensor providing process feedback must
to be serviced without stopping the process.
1 = Process PID controller output frozen
See also parameter
40.30 Set 1 setpoint freeze
enable .
not used
Not used Process PID controller output not frozen. 0
No. Name/Value Description Default
FbEq 16
63
%
100
T
t
O = I × (1 - e
-t/T
)
I = filter input (step)
O = filter output
t = time
T = filter time constant
Unfiltered signal
Filtered signal