13
(3) Auto tuning (AT)
Function that automatically processes and sets parameter P.I.D. for PID control. Processing time varies according
to control.
1) AT execution
Pressing the Ģ key on the “0-12 AT action control screen” causes the display at the bottom to change to
and all SV lamps to flash.
Pressing the ģ key then executes AT. All SV lamps light and the AT lamp flashes.
When AT is executed, ON/OFF output action is repeated several times according to increment or decrement of measured
values toward target set value. The PID value is saved in the internal memory and the action ends. Control based on the
PID value in the memory simultaneously starts and the AT lamp lights out.
0-12 AT action control
Ģ
key
ģ
key
Ä
Ä
All SV lamps flash All SV lamps light AT execution
AT lamp flashes
2) Cancellation of AT
To cancel AT before it finishes, select with the ġ key on the “0-12 AT action control screen.” When the ģ key is
pressed, AT is cancelled. All SV lamps light and the AT lamp then lights out.
0-12 AT action control
ġ
key
ģ
key
Ä
Ä
AT execution All SV lamps flash All SV lamps lightAT cancelled
AT lamp flashes AT lamp flashes AT lamp lights out
3) AT cannot be executed
AT cannot be executed under any of the following conditions:
1. Control output is manual. (AT screen not displayed)
2. Standby (AT screen not displayed)
3. Measured value (PV) is scaleover. (AT screen not displayed)
4. Control output proportional band (P) is OFF. (AT screen not displayed)
5. If lock No. 2 or 3 is set on the key lock screen. (Not possible on AT screen, but possible with DI)
4) AT cancellation during execution
AT is canceled during execution under any of the following conditions:
1. If 200 continuous minutes elapse while output value is 0% or 100%.
2. When PV is scaleover.
3. When switched to standby action.
5) AT when in program mode
1. AT is not executed during ramp step execution, unless the ramp step is executed in the hold action mode.
2. AT ends when the final step is completed, even if the set number of executing program is 2 or more.
3. AT ends when all AT actions based on PID No. are completed before the final step ends.
(4) Reset (RST)/run (RUN)
The controller is equipped with reset mode for temporarily halting controller execution.
This operation mode is switched on the “0-1 Standby setting screen.”
If RUN1 or RUN2 is selected on the “4-13 DI mode setting screen,” external control input (DI) is given
priority and settings cannot be made on the 0-1 screen.
1. The RUN lamp is lit green while the controller is operating, and goes off upon entering the reset mode.
2. Controller output for reset is 0%.
3. When reset is executed, auto tuning (AT) is canceled.
4. When reset is executed in the manual output mode, the manual output mode is canceled.
5. When the power is turned off while the controller is in reset mode, reset mode continues when the power is turned back on.
6. If event standby action is specified when switching to run mode (RUN) from reset mode (RST), the specified standby
action is executed.
7. If event latching is not engaged in the reset mode, alarms (Hd, Ld, od, id, HA, LA) are not output.
Note: If AT is canceled before completion, PID value is not changed.
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