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CHAPTER 4 FUNCTIONS
4
4.18 Self-tuning Function
(6) Conditions where self-tuning is not executed
This section explains the conditions where self-tuning is not executed.
(a) The control method is not the PID control method
When the control method is one of the four methods other than the PID control (two-position control, P control,
PI control, PD control), self-tuning is not executed. In addition, CH Self-tuning disable status (b8 of Un\G575,
Un\G607, Un\G639, Un\G671) turns 1 (ON).
When all PID constants of target channels turn to a value other than 0, self-tuning is enabled.
(b) Auto tuning is being executed
Self-tuning is not executed during the auto tuning (no error occurs). At the time of when auto tuning is
completed, self-tuning is enabled.
(c) The lower limit output limiter value is lower than the manipulated value (MV) and the
manipulated value (MV) is lower than the upper limit output limiter value when the
temperature control is started and the set value (SV) is changed
The starting ST does not start. However, self-tuning is enabled at the time of when a control response becomes
oscillatory under the following setting.
•CH Self-tuning setting (Un\G574, Un\G606, Un\G638, Un\G670) is set to Starting ST plus vibration ST
(4).
ON
ON
OFF
CH Proportional band (P) setting
(Un\G35, Un\G67, Un\G99, Un\G131)
CH Derivative time (D) setting
(Un\G37, Un\G69, Un\G101, Un\G133)
CH Self-tuning disable status
(b8 of Un\G575, Un\G607, Un\G639, Un\G671)
CH PID auto-correction status
(b0 of Un\G575, Un\G607, Un\G639, Un\G671)
Temperature process value (PV)
Time
Set value (SV)
Self-tuning disabled
Self-tuning in execution
OFF
Setting = 0
Setting 0
Setting = 0 Setting 0
(Depends on previous execution result)
Oscillation detected
CH Integral time (I) setting
(Un\G36, Un\G68, Un\G100, Un\G132)
Setting = 0
Setting 0