St (Self-Tuning) - Omron E5CN User Manual

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

ST (Self-tuning)

s t
46
AT execute/cancel
If you move to the operation level during AT execution, the No. 2 display
flashes to indicate that AT is being executed.
PV/SP
C
Only the "communications writing," "RUN/STOP," "AT execution/cancel," and
"program start" parameters can be changed during AT execution. Other
parameters cannot be changed.
This procedure executes auto-tuning (AT).
1. Press the O key to move from the operation level to the adjustment level.
2. Press the U key to start execution of AT (auto-tuning).
on will be displayed during AT execution.
3. off will be displayed when AT ends.
4. To return to the operation level, press the O key.
ST (auto-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.
at at
off
AT execution in progress
C
25 25
100 100
AT execution in progress
Section 3-8
No. 1 display
on
No. 2 display