YOKOGAWA UT350, Instruction Manual

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3-4
<Toc> <3. Operations>
IM 05D01D02-41E
3.3 Performing/Canceling Auto-tuning
Auto-tuning should be carried out after setting a target setpoint (SP). Make sure the control-
ler is in automatic operation mode (AUTO) before carrying out auto-tuning. See “ 3.8
Switching between AUTO and MAN,” to change to AUTO.
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
1st Edition : May 31,2000-00
1.
Bring the operating display into view
(display appears at power on).
P V
MAN
A / M
S P
AL1 2 3
SP
2 3 4
S E T / E N T
MAN lamp
OFF.
Displays
target setpoint.
Displays PV.
2.
Press the S E T / E N T key for more than 3 sec-
onds to call up the menu “OP.PA”.
P V
MAN
A / M
S P
AL1 2 3
SP
2 3 4
S E T / E N T
Displays
menu “OP.PA”.
3.
Press the
S E T / E N T
key five times to display
the parameter “AT”.
P V
MAN
A / M
S P
AL1 2 3
SP
2 3 4
S E T / E N T
Displays
parameter
“AT”.
4.
Press the or key to display the
required setpoint. Tuning for 1.SP is AT = 1.
P V
MAN
A / M
S P
AL1 2 3
SP 2 3 4
S E T / E N T
Blinks during
change.
To cancel auto-tuning, set AT = OFF.