<Toc>
<6. Parameters>
6-11
IM 05E01D02-41E
1st Edition : May 31,2000-00
●
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
select 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.
Maximum value of PV
input range (RH)
Minimum value of PV
input range (RL)
Segment 1
Segment 2
Reference point 2 (2.RP)
Reference point 1 (1.RP)
Segment 3
[1]: 1st group of
PID constants
[2]: 2nd group of
PID constants
[3]: 3rd group of
PID constants
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.RP
operating parameter).
-
Define the 1st and 2nd groups of PID constants (i.e., the 1.P, 1.I and 1.D operat
ing 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.RP and 2.RP operating 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).
Summary of Contents for UP350
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