Chapter 4 Parameters
4-137
Inp ut Selection
of the PID Fee dback
PID Cancelled
PID Freq.
out put
command
limit
08-09
Treatme nt o f t he
Feedback Signal Fau lt
Integral Time
Proportion
ga in
00-14=10 display o f t he
PID feed back
Differential
Time
00-20:KPV-C E0 1/
RS485
03-00~02:
UP/D own
key PG
08-00=0
or 02-01~06=21(pid off)
08-00:AVI/ACI
AUI /PG
P
08-01
D
08-03
I
08-02
08-04
08-07
If Hz>08-05
time exce eds 08-08
08-05
Frequ ency
command
+
-
+
+
Inp ut Selection of the
PID Targe ted Value
1
2
08-06
PID offset
Display of th e PID fee dback
uppe r limit
for
Int egral
PID
Delay
Time
+
PI Control: controlled by the P action only, and thus, the deviation cannot be eliminated
entirely. To eliminate residual deviations, the P + I control will generally be utilized. And
when the PI control is utilized, it could eliminate the deviation incurred by the targeted
value changes and the constant external interferences. However, if the I action is
excessively powerful, it will delay the responding toward the swift variation. The P
action could be used solely on the loading system that possesses the integral
components.
PD Control: when deviation occurred, the system will immediately generate some
operation load that is greater than the load generated single handedly by the D action to
restrain the increment of the deviation. If the deviation is small, the effectiveness of the
P action will be decreasing as well. The control objects include occasions with integral
component loads, which are controlled by the P action only, and sometimes, if the
integral component is functioning, the whole system will be vibrating. On such
occasions, in order to make the P action’s vibration subsiding and the system
stabilizing, the PD control could be utilized. In other words, this control is good for use
with loadings with no brake functions over the processes.
PID Control: Utilize the I action to eliminate the deviation and the D action to restrain the
vibration, thereafter, combine with the P action to construct the PID control. Use of the
PID method could obtain a control process with no deviations, high accuracies and a
stable system.
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