Table of Contents
Advertisement
5 Advanced Operations
PID Update (Adaptive Control) (a-ud)
This parameter is displayed if the Adaptive Control parameter is set to info (Notification) and
updateable PID constants are calculated.
This setting is used to manually update the PID constants to newly calculated PID constants. The
parameters can be updated in the following two cases.
• When PID Update parameter is being displayed
• When the Enable PID Constants for Adaptive Control Bit in the communications status is ON.
If you use the U Key to change the setting from off (OFF) to on (Update), the PID values are
updated to the values calculated with system performance evaluation. After the setting is updated,
the a-ud display disappears and the next parameter will be displayed.
After the setting is updated, the notification display (
performance is evaluated.
To prevent updating, perform one of the following operations. The
• Cycle the power supply.
• Set the Adaptive Control parameter for fixed operation (fix).
• Perform a software reset.
Adaptive Control Operation Possible Deviation (a-dv)
The set value of this parameter is used to determine if system performance evaluation for adaptive
control is possible based on the relationship between the process value and set point when control
is started.
This parameter gives the temperature range over which system performance evaluation is
performed using the temperature width from 0°C to the set point as 100%. The default is 50.0 (%).
To ensure the performance of adaptive control, do not set a value less than 50%.
If the Adaptive Control Operation Possible Deviation parameter is set to 50%, system
performance evaluation for adaptive control will not be performed if the starting temperature is
50% of the set point or higher from 0°C. (The
Example: If the set point is 280°C, the temperature range at which adaptive control is possible is
140°C.
If the temperature is 140°C or lower when adaptive control is enabled, adaptive control will be
performed. If the temperature is greater than 140°C, adaptive control will not be performed.
Temperature
at start of control
150°C
120°C
25°C
System Fluctuation Reference Deviation (a-sd)
This parameter is displayed when the Adaptive Control parameter is set to info (Notification).
If the rate of change in the proportional band* that is calculated for system performance evaluation
exceeds this reference value, the
variation in the system.
The default is 15.0%.
*
This is the rate of change in the proportional band calculated for the second system evaluation.
5 - 14
A
A
indicator will not flash and will not be lit.)
SP=280°C
System performance
evaluation is not possible.
140°C
(0°C to 50% of SP width)
System performance
evaluation is possible.
0°C
A
indicator lights to provide notification of a temperature
E5@D Digital Temperature Controllers User's Manual (H224)
indicator) will appear the third time system
A
indicator will go out.
50.0%
(default)
100.0%
Advertisement
Table of Contents
