Mitsubishi Electric MELSEC iQ-R Series User Manual page 107

■Conditions to execute the simultaneous temperature rise AT
When all of the following conditions are satisfied after the operations are executed, the simultaneous temperature rise
parameter is calculated.
• The PID control has been set. (All of the proportional band (P), integral time (I), and derivative time (D) are not 0.)
• The temperature process value (PV) has been stable for two minutes or longer just before the simultaneous temperature
rise AT is executed.
• The temperature process value (PV) just before the simultaneous temperature rise AT is executed is within theer
temperature measuring range. When the temperature process value (PV) goes outside the range after the simultaneous
tempature rise AT is executed, the auto tuning ends in failure. ( Page 46 When the auto tuning ends in failure)
• "Output Change Amount Limiter" of "Limiter setting" in "Application Setting" has been set to 0.
When all the conditions described above are not satisfied, the simultaneous temperature rise parameter is not calculated.
Only PID constants are calculated.
The following shows how the temperature control module operates when the simultaneous temperature rise AT has not been
executed.
'CH1 Auto tuning command' (Y4)
'CH1 Auto tuning status' (X4)
Control status
CH1 Simultaneous temperature rise AT
disable status (Un\G413, b2)
Executed in a program
Executed by the temperature control module
The temperature control module turns ON CH1 Simultaneous temperature rise AT disable status (Un\G413, b2). With 'CH1
Auto tuning status' (X4) ON, the module executes the same processing as the normal auto tuning.
ON
OFF
ON
OFF
PID control Auto tuning
ON
OFF
PID control
1.32 Simultaneous Temperature Rise Function
1
1 FUNCTIONS
105