7-18
■
PID parameter setting
100.0
P-1
1
Proportional band (PID group 1)
0
I-1
2
Integral time (PID group 1)
0
d-1
3
Derivative time (PID group 1)
50.0
rE -1
4
Manual reset (PID group 1)
0.0
oL-1
5
Manipulated variable lower limit (Output limiter group 1)
100.0
oH-1
6
Manipulated variable upper limit (Output limiter group 1)
100.0
P-2
7
Proportional band (PID group 2)
0
I-2
8
Integral time (PID group 2)
0
d-2
9
Derivative time (PID group 2)
50.0
rE-2
10
Manual reset (PID group 2)
0.0
oL-2
11
Manipulated variable lower limit
(Output limiter group 2)
100.0
oH-2
12
Manipulated variable upper limit
(Output limiter group 2)
100.0
P-3
13
Proportional band (PID group 3)
0
I-3
14
Integral time (PID group 3)
0
50.0
d-3
15
Derivative time (PID group 3)
rE-3
16
Manual reset (PID group 3)
0.0
oL-3
17
Manipulated variable lower limit
(Output limiter group 3)
100.0
oH-3
18
Manipulated variable upper limit
(Output limiter group 3)
100.0
P-4
19
Proportional band (PID group 4)
0
I-4
20
Integral time (PID group 4)
0
d-4
21
Derivative time (PID group 4)
50.0
rE-4
22
Manual reset (PID group 4)
0.0
oL-4
23
Manipulated variable lower limit (Output limiter group 4)
100.0
oH-4
24
Manipulated variable upper limit (Output limiter group 4)
100.0
P-5
25
Proportional band (PID group 5)
0
I-5
26
Integral time (PID group 5)
0
d-5
27
Derivative time (PID group 5)
50.0
rE-5
28
Manual reset (PID group 5)
0.0
oL-5
29
Manipulated variable lower limit (Output limiter group 5)
100.0
oH-5
30
Manipulated variable upper limit (Output limiter group 5)
100.0
P-6
31
Proportional band (PID group 6)
0
I-6
32
Integral time (PID group 6)
0
d-6
33
Derivative time (PID group 6)
: 0.0 to 1000.0%
ON-OFF control when set to 0.0
: 0 to 3600sec
No integral operation when set to 0
: 0 to 1200sec
No derivative operation when set to 0
: 0.0 to 100.0%
: -5.0 to manipulated variable upper limit %
: Manipulated variable lower limit to +105.0%
: -19999 to +20000 SPU
: -19999 to +20000 SPU
Item code
Item
No.
User
settings
Settings and descriptions
Factory default
settings
P
l
d
rE
oL
oH
CP
tP
[Description:]
When
P
is set to 0.0, ON-OFF control is on and
l
,
d
and
rE
settings display “-----” and setting is not possible.
When the
l
setting is not equal to 0, “-----” is displayed for
rE
and setting is not possible.
Although a low
P
setting improves control, overshoot and
hunting is more likely to occur.
Although a low
l
setting improves tracking, cycling caused
by integral operation occurs more often.
Although a low
d
setting makes it easier to suppress
overshoot, hunting is more likely to occur due to reactions to
minute PV action.
In normal temperature control,
derivative time should be between 1/3 to 1/4 of the integral
time.
Since derivative operation is a cause of hunting in
pressure and flow control, set
d
to 0.0 to turn off derivative
action or set a low value.
The
rE
setting is used to eliminate offset caused by
proportional action (no integral action) and sets a suitable
deviation of 0.
The
oL
and
oH
settings also operate as integral limiters.
When
oL
or
oH
manipulated variable reaches the upper or
lower limit, they turn off integral action and prevents reset
windup that occurs when PV has not risen for a long time.
The
CP
setting is the point where switching occurs between
PID groups A1 to A7.
tP
is the tuning point where
P
,
I
and
D
settings in groups A1
to A7 are automatically tuned starting from A1.
Chapter 7. PARAMETER SETUP
