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5-3
Performing Adaptive Control
5-3-1
Overview
Adaptive control has the following two features.
1. You can increase control performance over traditional auto-tuning.
2. Even if factors emerge during long-term equipment operation that cause temperature variations
and influence system characteristics, such as changes in the operating environment or
equipment deterioration, the changes can be followed to maintain high control performance.
We recommend adaptive control in the following cases.
• When satisfactory control is not possible with the PID constants calculated with auto-tuning
• When high control performance cannot be maintained due to temporal variations in system
characteristics, such as changes in the environment or equipment deterioration
Broadly speaking, adaptive control provides the following two functions.
• Control with PID constants that are optimum for the system characteristics
• Maintenance of optimum status following changes in system characteristics
You can also use only the function to find the optimum PID constants for the system characteristics.
1. Control with PID Constants That Are Optimum for the System
Characteristics
To find the PID constants for adaptive control, set adaptive control (adpt) for automatic updating
(auto) and then perform the following procedure.
1
Perform auto-tuning to determine system characteristics.
2
Lower the temperature sufficiently.
3
Increase the temperature to the set point. While the temperature is rising, system perfor-
mance will be evaluated and the PID constants for adaptive control will be calculated
automatically. (The
4
From here on, control will be performed with the PID constants for adaptive control.
The PID constants for adaptive control will reflect the system characteristics more than
the PID constants calculated with auto-tuning to enable better control.
1 Perform auto-tuning to determine
system characteristics.
Note: When using adaptive control, turn ON power for the load (e.g., heater) at the same time as or
E5@D Digital Temperature Controllers User's Manual (H224)
indicator will flash during this process.)
A
2 Reduce the temperature
sufficiently.
Preparations for
adaptive control
before supplying power to the Digital Controller. If you turn ON the power supply to the load
after you turn ON the power supply to the Digital Controller, correct system performance
evaluation will not be possible, the PID constants for adaptive control will not be calculated
correctly, and you will not achieve optimum control.
5 Advanced Operations
4 Control is performed with PID
constants for adaptive control, which
3 System performance is
give better control performance than
evaluated.
the PID constants from auto-tuning.
Automatic setting of optimum PID
constants for adaptive control
5
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