YOKOGAWA UT520 - Setting Target Setpoint (SP); Performing and Canceling Auto-tuning

<Toc> < 3. Operations >
3-3
IM 05D01C02-41E 3rd Edition: May 31, 2006-00
3.2 Setting Target Setpoint (SP)
The following operating procedure describes an example of setting 150.0 to a target
setpoint. In automatic operation, the controller starts control using set target setpoints.
1. Bring the operating display into view
(display appears at power on).
SET/ENT
A/M
PV
AL1 2 3 4
REM
CAS
MAN
LP2
Displays PV.
Displays
target setpoint-1
“1.SP”.
2. Press the or key to display the
required setpoint.
SET/ENT
A/M
PV
AL1 2 3 4
REM
CAS
MAN
LP2
Blinks during
change.
3. Press the
SET/ENT
key once to register the
setpoint.
SET/ENT
A/M
PV
AL1 2 3 4
REM
CAS
MAN
LP2
3.3 Performing/Canceling Auto-tuning
Auto-tuning should be carried out after setting a target setpoint (SP). Make sure the con-
troller is in automatic operation mode (AUTO) and in running state (RUN) before carrying
out auto-tuning. See “3.8 Switching between AUTO and MAN,” to change to AUTO and
“3.7 Switching between Run and Stop,” to change to Run.
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 affect-
ing product quality