C5-2
IM 34M06H62-02E
2nd Edition : June 2008-00
Dynamic auto-tuning does not operate when any of the following conditions is true.
-
When Dynamic auto-tuning Enable (SELF) is set to “0: Disabled”
-
When Control Type Selection (OT) is not set to “0: PID Control”
-
When Zone PID Selection (ZONE) is set to “1: Enabled”
-
When Run/Stop Selection (RUN/STP) is set to “0: Stop”
-
When Automatic/Manual/Cascade Selection (A/M/C) is set to “1: Manual”.
-
When Remote/Local Selection (RMT/LOC) is set to “1: Remote”.
-
For the secondary loop in cascade control
-
When the Rate-of-Change Limit (MVR) is not “0: Off”
-
When the SP Up Gradient (SPR.UP) or SP Down Gradient (SPR.DN) is not “0: Off”.
-
When a burnout or AD converter error is detected
Table C5.1 Parameters Related to Dynamic auto-tuning
Data Position Number
Symbol Description Unit Data
Range
Default
Value Attribute Stored
Loop1
Loop2
Loop3
Loop4
181
381
581
781
SELF Dynamic auto-tuning enable
None
0: disabled; 1: enabled
0
RW
Dynamic auto-tuning updates the PID parameters automatically when PID values are
calculated. In situations where this is undesirable, set the Dynamic auto-tuning Enable
(SELF) parameter to “0: Disabled”.
Dynamic auto-tuning should not be used with the following processes:
- Equipment with interference and equipment subjected to regular external
disturbances
-
Fast response processes such as flow control or pressure control systems
When performing dynamic auto-tuning, always turn on the controlled load (e.g. heater)
before starting dynamic auto-tuning. In addition, always perform control in a closed loop.
If you fail to observe these precautions, or if there are interference or external
disturbances during measurement, the calculated PID values may be inappropriate. If
control remains unstable even after you continue with dynamic auto-tuning, adopt the
following measures and recalculate the PID values.
-
Set the PID group in use to the following values: PB=5.0%; TI=1 second; TD=Off.
-
Enter Stop mode, and again change to Run mode.
If you still cannot achieve stable control after adopting these measures, disable dynamic
auto-tuning, and perform normal auto-tuning, or calculate the PID values manually.
Содержание F3CU04-0S
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Страница 97: ...B3 7 IM 34M06H62 02E 2nd Edition June 2008 00 Figure B3 2 Sample Program for Setting Controller Parameters 2 2...
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Страница 110: ...B4 2 IM 34M06H62 02E 2nd Edition June 2008 00 Figure B4 1 Sample Program Component for Setting Setup Parameters 2 5...
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Страница 215: ...C8 1 IM 34M06H62 02E 2nd Edition June 2008 00 C8 Alarm Function This chapter describes the alarm function of the module...
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