YOKOGAWA UTAdvanced UP55A, User Manual

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8-68
IM 05P02C41-01EN
8.9 Adjusting Auto-tuning Operation
Description
Auto-tuning Type
“Normal” of auto-tuning type requires a rapidly rising PID constant. This type is useful for
processes that allow some overshooting.
On the other hand, “stable” of auto-tuning type requires a slowly rising PID constant.
Auto-tuning Output Limiter
When executing auto-tuning, the control output high and low limits can be set.
When the control output low limit > AT.OL, or AT.OH < control output high limit, auto-
tuning is limited by the control output low or high limit.
In Heating/cooling control, AT.OH and AT.OL do not work.
Note
In time proportional output, the output is turned on and off irrespective of the upper/lower limit.
Setting Details
Parameter
symbol
Name
Display
level
Setting range Menu symbol
AT.TY Auto-tuning type STD
0: Normal
1: Stability
TUNE AT.OH
Output high limit in
auto-tuning
PRO
-5.0 to 105.0% (Disabled in
Heating/cooling control)
AT.OL
Output low limit in
auto-tuning
PRO
Note1: In Cascade control, the LP2 lamp is lit while the Loop-2 parameter is displayed.
► SP bias in auto-tuning: 6.2 Performing and Canceling Auto-tuning