Mitsubishi Electric MELSEC iQ-R Series User Manual page 45

Conditions in which the auto tuning cannot be executed
When one of the following conditions is satisfied, the auto tuning cannot be executed.
Condition
1 The module is in the setting mode ('Setting/operation mode status' (X1): OFF).
■In the R mode
2
In the standard control or heating-cooling control, 0 (0 ()) has been set for 'CH1 Proportional band (P) setting' (Un\G431) and 'CH1 Heating
proportional band (Ph) setting' (Un\G431). (The two-position control has been applied.)
■In the Q compatible mode
In the standard control or heating-cooling control, 0% has been set for "Proportion Belt (P) Setting" of "Control basic parameters" in "Application
Setting." (The two-position control has been applied.)
3 'CH1 AUTO/MAN mode shift' (Un\G518) has been set to MAN (1).
4 "Unused" has been set for the corresponding channels in "Unused channel setting" of "Control basic parameters" in "Application Setting."
5 'CH1 PID control forced stop command' (YC) is ON.
6 A hardware failure has occurred. (The ERR LED is ON.)
7 The value in 'CH1 Temperature process value (PV)' (Un\G402) has exceeded the temperature measuring range. (CH1 Input range upper limit
(Un\G401, b0) or CH1 Input range lower limit (Un\G401, b1) is ON.)
8 'CH1 Memory's PID constants read command' (Un\G440) has been set to Requested (1).
9 CH1 Write completion flag (Un\G47, b0) is ON.
10 The set value (SV) or the AT point is out of the range set in "Upper Limit Setting Limiter" and "Lower Limit Setting Limiter" of "Limiter setting" in
"Application Setting."
■When one of the conditions 1 to 5 is satisfied
The auto tuning starts when the condition is cleared.
■When the condition 7 is satisfied
Even though the temperature process value (PV) goes back within the temperature measuring range, the auto tuning does
not start until 'CH1 Auto tuning command' (Y4) is turned from OFF to ON again.
■When the condition 8 or 9 is satisfied
Even though the internal processing of the auto tuning is completed and PID constants are stored, 'CH1 Auto tuning status'
(X4) does not turn OFF and the auto tuning is not completed.
■When the condition 10 is satisfied
Even though the set value (SV) or the AT point goes back within the range set in "Upper Limit Setting Limiter" and "Lower
Limit Setting Limiter" of "Limiter setting" in "Application Setting," auto tuning does not start until 'CH1 Auto tuning command'
(Y4) is turned from OFF to ON again.
1 FUNCTIONS
1.11 Auto Tuning Function
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