YOKOGAWA UP750, Руководство пользователя

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3-28
<Toc> <3. Programming>
IM 05E01B02-41E
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Selection of PID Constants when the Control Range is Split into Three
Zones
As shown in the figure below, three zones are set for the controller to automatically switch
from one group of PID constants to another. Two zones can also be set for the controller to
switch between two groups of PID constants.
[1] The controller uses the 1st group of PID constants if the PV input value is within the
zone set off by the minimum value of the PV input range and reference point 1.
[2] The controller uses the 2nd group of PID constants if the PV input value is within the
zone set off by reference point 1 and reference point 2.
[3] The controller uses the 3rd group of PID constants if the PV input value is within the
zone set off by reference point 2 and the maximum value of the PV input range.
3rd group of
PID constants
2nd group of
PID constants
1st group of
PID constants
Maximum value of
PV input range (RH1)
Minimum value of
PV input range (RL1)
Segment 1 Segment 2
Reference point 2
(2.RP1)
Reference point 1
(1.RP1)
Segment 3
1
2
3
PV input value
Program setpoint
<Controller Settings>
• Splitting the control range into two zones
- To split the control range into two zones, define reference point 1 (i.e., the 1.RP1
setup parameter).
- Define the 1st and 2nd groups of PID constants (i.e., the 1.P, 1.I and 1.D
operating parameters for the 1st group and the 2.P, 2.I and 2.D operating
parameters for the 2nd group).
• Splitting the control range into three zones
- To split the control range into three zones, define reference points 1 and 2
(i.e., the 1.RP1 and 2.RP1 setup parameters).
- Define the 1st, 2nd and 3rd groups of PID constants (i.e., the 1.P, 1.I and 1.D
operating parameters for the 1st group, the 2.P, 2.I and 2.D operating parameters
for the 2nd group and the 3.P, 3.I and 3.D operating parameters for the 3rd
group).
1st Edition : May 31,2000-00