R3-TC2
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8468 Rev.3 P. 37 / 37
AUTO-TUNING
Limit cycle method auto-tuning is available for standard PID and heating-cooling PID control to automatically determine ap-
propriate PID parameters by providing MV signal in steps as shown below and observing PV signal behavior.
Auto-tuning conditions should be set in advance. The Controller starts auto-tuning by a command.
CAUTION
In order to stop a running auto-tuning process, turn the power supply off or STOP the loop operation. Once
STOP is applied, switch to RUN again to resume normal control, cancelling the auto-tuning.
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AUTO-TUNING CONTROL TYPE
ADDRESS
PARAMETER
RANGE
DEFAULT
+207
Loop 1, Auto-tuning control type
See the table below.
0
+463
Loop 2, Auto-tuning control type
SET VALUE AUTO-TUNING CONTROL TYPE
0
Follow-up PID control
1
Follow-up PI control
2
PID control with fixed setpoint
3
PI control with fixed setpoint
Follow-up control is suitable for a loop in which the setpoint changes according to the process status.
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AUTO-TUNING HYSTERESIS (DEADBAND)
Specify hysteresis values to be applied when monitoring PV variation in the auto-tuning process.
If the PV fluctuates, set a larger value. Too large a value may result in tuning to inappropriate PID parameters.
ADDRESS
PARAMETER
RANGE
DEFAULT
+208
Loop 1, Auto-tuning hysteresis
0.0 to 999.9
(decimal by input 1/2 decimal setting)
0.1
+464
Loop 1, Auto-tuning hysteresis
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AUTO-TUNING MV HIGH LIMIT / AUTO-TUNING MV LOW LIMIT
Specify the maximum range of MV applied in steps for auto-tuning.
With standard PID control, 0.00 is used for a negative range.
With heating-cooling PID control, a negative value is used for the cooling control.
ADDRESS
PARAMETER
RANGE
DEFAULT
+209
Loop 1, Auto-tuning MV high limit
-105.00 to +105.00 %
100.00
+210
Loop 1, Auto-tuning MV low limit
-100.00
+465
Loop 2, Auto-tuning MV high limit
100.00
+466
Loop 2, Auto-tuning MV low limit
-100.00
PV
MV
SP
