Mitsubishi Electric MELSEC iQ-R Series User Manual page 54

■When the setting variation rate limiter has been set to a value other than 0 (0 ())
When a value other than 0 (0 ()) has been set for each of the following settings, CH1 Self-tuning disable status (Un\G411,
b8) is turned ON.
• "Setting change rate limiter" of "Limiter setting" in "Application Setting"
• "Setting change rate limiter (Temperature drop)" of "Limiter setting" in "Application Setting"
■When the heating-cooling control or position-proportional control has been selected as the
control mode
The self-tuning is not executed.
Discontinuation of self-tuning
The following operation during the self-tuning discontinues the self-tuning.
• When "Self-tuning setting" in "Application Setting" has been changed to "Do Not Run the ST"
The self-tuning operation in process is discontinued and the self-tuning is not executed after that. (An error does not occur.)
Whether the self-tuning is being executed or not can be checked in 'CH1 Auto tuning status' (X4).
Conditions in which the self-tuning ends in failure
Under the following conditions, the self-tuning ends in failure. When the self-tuning ends in failure, CH1 Self-tuning error
(Un\G411, b10) is turned ON.
• After the self-tuning was started, 6000 seconds (1 hour and 40 minutes) or longer have passed.
• The variation speed of the temperature process value (PV) during the self-tuning is slower than 1.125 (/min).
• 'CH1 Temperature process value (PV)' (Un\G402) has been out of the temperature measuring range.
• Required measurement data was not obtained because the manipulated value (MV) did not reach the upper limit output
limiter value or the lower limit output limiter value before the completion of the measurement.
• The temperature process value (PV) that was supposed to increase after the self-tuning was started with the starting ST,
and decreased by 1 () or more instead.
• The temperature process value (PV) that was supposed to decrease after the self-tuning was started with the starting ST,
and increased by 1 () or more instead.
• The setting for the buffer memory areas in the following table was changed during self-tuning.
Buffer memory
CH1 Set value (SV) setting
CH1 Proportional band (P) setting
CH1 Integral time (I) setting
CH1 Derivative time (D) setting
CH1 Unused channel setting
CH1 Control output cycle setting
CH1 Upper limit output limiter
CH1 Lower limit output limiter
CH1 Output variation amount limiter
CH1 Setting variation rate limiter/setting variation rate limiter
(temperature rise)
CH1 Setting variation rate limiter (temperature drop)
CH1 Direct/reverse action setting
CH1 AUTO/MAN mode shift
CH1 Primary delay digital filter setting
CH1 Sensor correction value setting
*1 Only during start-up
1 FUNCTIONS
52
1.12 Self-tuning Function
*1
Reference
Un\G430 Page 244 CH1 Set value (SV) setting
Un\G431 Page 245 CH1 Proportional band (P) setting
Un\G432 Page 247 CH1 Integral time (I) setting
Un\G433 Page 248 CH1 Derivative time (D) setting
Un\G502 Page 259 CH1 Unused channel setting
Un\G504 Page 261 CH1 Control output cycle setting
Un\G508 Page 265 CH1 Upper limit output limiter
Un\G509 Page 267 CH1 Lower limit output limiter
Un\G510 Page 268 CH1 Output variation amount limiter
Un\G513 Page 271 CH1 Setting variation rate limiter/setting variation rate limiter
(temperature rise)
Un\G514 Page 272 CH1 Setting variation rate limiter (temperature drop)
Un\G515 Page 272 CH1 Direct/reverse action setting
Un\G518 Page 274 CH1 AUTO/MAN mode shift
Un\G563 Page 310 CH1 Primary delay digital filter setting
Un\G565 Page 312 CH1 Sensor correction value setting