Azbil DCP31 - Disturbance inhibit proportional band (PID set 2)

7-40
Chapter 7. PARAMETER SETUP
No. Item Code Item
Factory
Setting
User
Setting
Setting
18
D P -2
Disturbance inhibit
proportional band
(PID set 2)
100.0  • Onheat/coolmodels,thesetNo.ofthe
PID parameter used for the PID set No.
is as follows:
PID Set No. Designated in
the Program or Zone No.
According to Automatic
Selection of PID Set
PID Set
(heat)
PID Set
(cool)
1 1 2
2 3 4
3 5 6
4 7 8
 • Whenvariableparameter
2 P 1 D
setting is 1 (2 degrees of freedom
PID enabled), the parameter (
P
,
1
,
D
)
ideal for control when SP changes and
the parameter (
D P
,
D 1
,
D D
) ideal for
inhibiting disturbance during settling
are automatically switched.
 • Decreasingtheproportionalband(
P
,
D P
) value improves controllability.
However, it also makes overshoot or
hunting more likely to occur.
Use of the controller on a motor or
actuator shortens the controller’s life.
Do not set the proportional band (
P
,
D P
) to too small a value.
 • Decreasingtheresettime(
1
,
D 1
) im-
proves trackability.
However, it also makes cycling caused
by integrating action more likely to
occur.
When
1
setting is 0, integrating opera-
tion for inhibiting disturbance also
functions.
19
D I -2
Disturbance inhibit
reset time
(PID set 2)
120
20
D D -2
Disturbance inhibit
rate time
(PID set 2)
0
21
P -3
Proportional band
(PID set 3)
100.0
22
1 -3
Reset time
(PID set 3)
0
23
D -3
Rate time
(PID set 3)
0
24
O L -3
MV lower limit
(PID set 3)
0.0
25
O H -3
MV upper limit
(PID set 3)
100.0
26
R E -3
Manual reset
(PID set 3)
50.0
27
B R -3
Brake
(PID set 3)
0
28
D P -3
Disturbance inhibit
proportional band
(PID set 3)
100.0
29
D I -3
Disturbance inhibit
reset time
(PID set 3)
120
30
D D -3
Disturbance inhibit
rate time
(PID set 3)
0