ABB ACS280 Firmware Manual page 231

No. Name/Value
40.34 Set 1 derivation time
0.000...10.000 s
40.35 Set 1 derivation filter
time
0.0...10.0 s
40.36 Set 1 output min
-200000.00...
200000.00
40.37 Set 1 output max
-200000.00...
200000.00
40.38 Set 1 output freeze
enable
Not used
Description
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 and E ) according to the following
K-1 K
formula:
PID DERIV TIME × (E - 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.
Defines the minimum limit for the process PID
controller output. Using the minimum and maximum
limits, it is possible to restrict the operation range.
Minimum limit for process PID controller output.
Defines the maximum limit for the process PID
controller output. See parameter
min
.
Maximum limit for process PID controller output.
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
40.30 Set 1 setpoint freeze
See also parameter
enable
.
Process PID controller output not frozen.
T
)/ , in which
K-1 S
t
)
40.36 Set 1 output
Parameters 231
Default
FbEq 16
0.000 s
1000 = 1 s
0.0 s
10 = 1 s
0.00
1 = 1
100.00
1 = 1
not used
0