Mitsubishi Electric MELSEC iQ-R Series User Manual page 53

Conditions in which the self-tuning is not executed
The following lists the conditions.
■When the control method is other than PID control
When a control method other than PID control (two-position control, P control, PI control, or PD control) is selected, the
selftuning is not executed. CH1 Self-tuning disable status (Un\G411, b8) is turned ON. When all PID constants of the target
channels turn to a value other than 0, the self-tuning is enabled.
Temperature process value (PV)
Set value (SV)
'CH1 Proportional band (P) setting'
(Un\G431)
'CH1 Integral time (I) setting'
(Un\G432)
'CH1 Derivative time (D) setting'
(Un\G433)
CH1 Self-tuning disable status
(Un\G411, b8)
CH1 PID auto-correction status
(Un\G411, b0)
■While the auto tuning is being executed
While the auto tuning is being executed, the self-tuning is not executed. At this time, an error does not occur.
When the auto tuning is completed, the self-tuning is enabled.
■The lower limit output limiter value is smaller than the manipulated value (MV) and the
manipulated value (MV) is smaller than the upper limit output limiter value when the
temperature control is started or the set value (SV) is changed
The starting ST does not start. However, when the following setting has been configured, the self-tuning is enabled at the time
of when a control response becomes oscillatory.
• "Starting ST plus Vibration (PID Constant Only)" has been set for "Self-tuning setting" in "Application Setting"
■When the temperature process value (PV) is out of the temperature measuring range
The self-tuning is not executed. CH1 Self-tuning disable status (Un\G411, b8) is turned ON.
■When a value other than 0 (0.0%/s) has been set for "Output Change Amount Limiter" of
"Limiter setting" in "Application Setting"
The self-tuning is not executed. CH1 Self-tuning disable status (Un\G411, b8) is turned ON.
■When 'CH1 AUTO/MAN mode shift' (Un\G518) has been set to MAN (1)
The self-tuning is not executed. CH1 Self-tuning disable status (Un\G411, b8) is turned ON.
Oscillation detected
Self-tuning disabled
Setting = 0
Setting ≠ 0
Setting = 0
Setting = 0
ON
ON
(Depends on previous execution result)
Self-tuning in execution
Setting ≠ 0
Setting ≠ 0
OFF
OFF
1.12 Self-tuning Function
1
Time
1 FUNCTIONS
51