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5 Advanced Operations
2. Maintenance of Optimum Status Following Changes in System
Characteristics
After the PID constants for adaptive control are calculated, the system performance is evaluated
each time the equipment is started and the PID constants for adaptive control are updated
according to any changes. Therefore, even if the heater or other equipment deteriorates over time
and system performance changes gradually, control with the optimum PID constants is possible.
After 1 year
Adaptation to changes
Note1. The expected performance will not be achieved if heaters deteriorate to the point where there is insufficient capacity
to reach the set point.
2. This function cannot be used during any of the following: heating/cooling control, an analog input type, direct
operation, and SP ramp operation.
Related Parameters
Parameter
Adaptive Control
PID Update (adaptive
control)
Adaptive Control
Operation Possible
Deviation
System Fluctuation
Reference Deviation
The following parameters are also available. These parameters are set automatically, so there is no
need to change the settings.
• Model Parameters: These parameters are set to determine the system characteristics with
auto-tuning.
• SP response PID constants, disturbance PID constants, and SP Response Coefficient Number:
These PID constants are used for adaptive control. Refer to 5-14.
5 - 12
After 5 years
After 10 years
Display
Set (monitor) values
off: Disabled
adpt
fix: Fixed
info: Notification
auto: Automatic update
off: OFF
a-ud
on: Updated
0.0% to 100.0%
a-dv
0°C (32°F) to Set point =
100%
0.0% to 100.0%
a-sd
Using adaptive control
Not using adaptive control
Default
Level
Initial Setting Level
off
Adjustment Level
off
50.0
Advanced Function
Setting Level
15.0
Advanced Function
Setting Level
E5@D Digital Temperature Controllers User's Manual (H224)
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