ABB ACS 160 - Page 98

88 ACS 160 User’s Manual
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
PID DERIV FILTER.
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
ERROR VALUE INV to 1 (YES).
0 =
NO
1 = YES
4006 ACTUAL VAL SEL
PID controller feedback (actual) signal selection. Feedback signal can be a combination of two actual
values
ACT1 and ACT2. Source for actual value 1 is selected by parameter 4007 and source for actual value
2 is selected by parameter 4008.
1 =
ACT1
Actual value 1 is used as the feedback signal.
2 =
ACT1-ACT2
Difference of actual values 1 and 2 is used as the feedback signal.
3 =
ACT1+ACT2
Sum of actual values 1 and 2.
4 =
ACT1*ACT2
Product of actual values 1 and 2.
5 =
ACT1/ACT2
Quotient of actual values 1 and 2.
6 =
MIN (A1, A2)
Smaller of actual values 1 and 2.
7 =
MAX (A1, A2)
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.
Code Description
t
100 %
Gain
Process Error Value
PID derivation time