4-2
<Toc>
<4. Operations>
IM 05E01D02-41E
1st Edition : May 31,2000-00
4.2
Performing/Canceling Auto-tuning
Perform auto-tuning when you have finished creating program patterns. Make sure the
controller is in Run state (PRG) before carrying out auto-tuning. See “4.4 Starting (PRG)/
Stopping (RESET) the Controller,” to change to PRG.
PID constants are obtained by using the current program setpoint value at the start of auto-
tuning.
NOTE
When on-off control is being used, auto-tuning cannot be carried out. Moreover, do not
perform auto-tuning when controlling any of the following processes.
•
Control processes with quick response such as flow control or pressure control
•
Processes where even temporary output on/off results in inconvenience
•
Processes where a large output change at control element results in inconvenience
•
Processes where variations in PV may exceed an allowable range, adversely affecting
product quality
1.
Bring the operating display into view
(display appears at power on).
Run (PRG) state
P V
SP
PVE1
TME
PVE2
PRG1
HLD
PRG2
SET/ENT
1
PRG
2
PRG
RESET
Displays
current program
setpoint.
PRG1 or PRG2
lamp ON.
Displays PV.
2.
Press the
SET/ENT
key for more than 3 seconds
to call up the menu “OP.PA”.
P V
SP
PVE1
TME
PVE2
PRG1
HLD
PRG2
SET/ENT
1
PRG
2
PRG
RESET
Displays
menu “OP.PA”.
3.
Press the
SET/ENT
key several times to display
the parameter “AT”.
P V
SP
PVE1
TME
PVE2
PRG1
HLD
PRG2
SET/ENT
1
PRG
2
PRG
RESET
Displays
parameter
“AT”.
4.
Press the
or
key to display the
required setpoint. Set as “AT = 1” to per-
form auto-tuning for the first group of PID
constants.
P V
SP
PVE1
TME
PVE2
PRG1
HLD
PRG2
SET/ENT
1
PRG
2
PRG
RESET
Blinks during
change.
To cancel auto-tuning, set AT = OFF.
Summary of Contents for UP350
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