ABB ACS 400 User Manual page 105

Code Description
4003 PID DERIV TIME
PID controller derivation time. If the process error value changes linearly, D part adds a constant value into
the PID controller output. The derivative is filtered with a 1-pole filter. The time constant of the filter is
defined by parameter 4004
4004 PID DERIV FILTER
Time constant for the filter of D part. By increasing the filter time constant it is possible to smooth the effect
of the D part and suppress noise.
4005 ERROR VALUE INV
Process error value inversion. Normally, a decrease in feedback signal causes an increase in drive speed.
If a decrease in feedback signal is desired to cause a decrease in speed, set
0 =
NO
1 =
YES
4006 ACTUAL VAL SEL
PID controller feedback (actual) signal selection. Feedback signal can be a combination of two actual
values 1 and
ACT
2 is selected by parameter 4008.
1 = 1
ACT
Actual value 1 is used as the feedback signal.
2 = 1- 2
ACT ACT
Difference of actual values 1 and 2 is used as the feedback signal.
3 = 1+ 2
ACT ACT
Sum of actual values 1 and 2.
4 = 1* 2
ACT ACT
Product of actual values 1 and 2.
5 = 1/ 2
ACT ACT
Quotient of actual values 1 and 2.
6 = ( 1, 2)
MIN A A
Smaller of actual values 1 and 2.
7 = ( 1, 2)
MAX A A
Greater of actual values 1 and 2.
8 = sqrt (A1-A2)
Square root of difference of actual values 1 and 2.
9 = sqA1 + sqA2
Sum of square roots of actual values 1 and 2.
ACS 400 User's Manual
PID DERIV FILTER
100 %
Gain
2. Source for actual value 1 is selected by parameter 4007 and source for actual value
ACT
.
Process Error Value
PID derivation time
t
to 1 (
ERROR VALUE INV
).
YES
95