Group 40: Pid Control - ABB ACS 400 User Manual

Group 40: PID Control

The PID Control Macro allows the ACS 400 to take a reference signal (setpoint) and an actual signal
(feedback), and automatically adjust the speed of the drive to match the actual signal to the
reference. The control signal block diagram is show in figure 34 on page 118 of the Appendix.
Code Description
4001 PID GAIN
This parameter defines the gain of the PID Controller. The setting range is 0.1... 100.
If you select 1, a 10 % change in error value causes the PID Controller output to change by 10 %.
* Limited by parameter 2008
4002 PID INTEG TIME
PID controller integration time. Defined as the time in which the maximum output is achieved if a constant
error value exists and the gain is 1. Integration time 1 s denotes that a 100 % change is achieved in 1 s.
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
86
.
MAXIMUM FREQ
Gain
Gain
PID integration time
.
PID DERIV FILTER
100 %
Gain
PID derivation time
t
Process Error Value
t
ERROR VALUE INV
ACS 400 User's Manual
to 1 ( ).
YES