4 Basic Operation
4 - 52
E5@C-T Digital Temperature Controllers User’s Manual (H185)
z All PID 100% AT and All PID 40% AT
• For details on All PID 100% AT and All PID 40% AT, refer to 5-14 Determining PID Constants for
PID Sets (Autotuning for All PID Sets).
The 100% autotuning is executed.
Operating Procedure
1
Press the M Key several times in the Adjustment Level to dis-
play at (AT Execute/Cancel).
Adjustment Level
2
Press the U or D Key to select at-2 (100% AT execute).
* The TUNE indicator will light during autotuning.
3
When AT ends, the AT Execute/Cancel parameter is set to off.
Adjustment Level
4-9-2 RT (Robust Tuning) (Used for Autotuning)
• When autotuning is executed with RT selected, PID constants are
automatically set that make it hard for control performance to degenerate even
when control object characteristics change.
• RT can be set in the Advanced Function Setting Level when PID control has
been set.
• The RT mode cannot be selected while an analog input is set.
• Selecting the RT mode in the following cases will help to prevent hunting from
occurring.
• When the set temperature is not constant and is changed in a wide range
• When there are large variations in ambient temperatures due to factors such
as seasonal changes or differences between day and night temperatures
• When there are large variations in ambient wind conditions and air flow
• When heater characteristics change depending on the temperature
• When an actuator with disproportional I/O, such as a phase-control-type
power regulator, is used
• When a rapidly heating heater is used
• When the control object or sensor has much loss time
• When hunting occurs in normal mode for any reason
* PID constants are initialized to the factory settings by switching to RT
mode.
* When the RT mode is selected, the Integral/Derivative Time Unit pa-
rameter changes to 0.1 s.
off
at
AT Execute/
Cancel
at-2
at
off
at
AT Execute/
Cancel
rt
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