St (Self-Tuning) - Omron E5AN User Manual

Determining PID Constants (AT, ST, Manual Setup)
Operating Procedure
Adjustment Level
AT Execute/
at
Cancel
off
at
at-1
at
off
Operation Level
PV
C
25
0
3-8-2

ST (Self-tuning)

s t
64
■
100% AT
Operation will be as shown in the following diagram, regardless of the devia-
tion (DV) at the start of AT execution. To shorten the AT execution time, select
100% AT.
PV
SP
Note The Limit Cycle MV Amplitude parameter is disabled.
This procedure executes 40%AT.
1. Press the O Key to move from the operation level to the adjustment level.
2. Press the U Key to select at-1. The No. 1 display for AT Execute/Cancel
will flash during AT execution.
3. off will be displayed when AT ends.
4. To return to the operation level, press the O Key.
ST (self-tuning) is a function that finds PID constants by using step response
tuning (SRT) when Controller operation begins or when the set point is
changed.
Once the PID constants have been calculated, ST is not executed when the
next control operation is started as long as the set point remains unchanged.
ST (self-tuning) is enabled when the ST parameter is set to ON in the initial
setting level.
When the ST function is in operation, be sure to turn the power supply of the
load connected to the control output ON simultaneously with or before starting
Controller operation.
When executing self-tuning, turn ON power for the load (e.g., heater) at the
same time as or before supplying power to the Digital Temperature Controller.
If power is turned ON for the Digital Temperature Controller before turning ON
power for the load, self-tuning will not be performed properly and optimum
control will not be achieved.
Limit Cycle MV
Amplitude 100%
AT started AT ended
Section 3-8
Time