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4/00 UDC 3300 Process Controller Product Manual 89
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
ACCUTUNE
DISABL
TUNE
SP
TUN+PV
SP+PV
ACCUTUNE for Loop 1
DISABLE —Disables the Accutune function.
DEMAND TUNING—If TUNE is selected, and tuning is
initiated through the operator interface or digital input (if
configured), the algorithm calculates new tuning
parameters and enters them into the tuning group. This
tuning requires no process knowledge and does not
require line out for initialization.
SETPOINT TUNING —This selection tunes on setpoint
changes only. It employs time domain analysis to
accelerate line out at any desired setpoint without prior
initialization or process knowledge.
SP is the recommended start-up mode—to be used when
no knowledge of the process tuning values is available. In
the Start-up mode, and after enabling ACCUTUNE, the
operator simply lines out the process variable in manual
mode, selects the desired SP value and switches to
automatic mode.
DEMAND TUNING PLUS PV ADAPTIVE TUNE—This
selection provides “TUNE” On Demand tuning plus PV
Adaptive tuning whenever a PV process disturbance of
0.3 % span or greater occurs. It will take 1-1/2 process
cycles around setpoint before any process recognition and
re-tuning can occur due to PV disturbances.
SETPOINT TUNING PLUS PV ADAPTIVE TUNE—This
selection tunes on setpoint changes but also whenever a
PV process disturbance of 0.3 % span or greater occurs. It
will take 1-1/2 process cycles around setpoint before any
process recognition and re-tuning can occur due to PV
disturbances.
ACCUTUN2
DISABL
TUNE
SP
TUN+PV
SP+PV
ACCUTUNE for Loop 2—Available only if configured for
2-Loop or Cascade control.
DISABLE ACCUTUNE—Disables the Accutune function
for Loop 2.
DEMAND TUNING—Same as ACCUTUNE.
SETPOINT TUNING—Same as ACCUTUNE.
DEMAND TUNING PLUS PV ADAPTIVE TUNE—Same
as ACCUTUNE.
SETPOINT TUNING PLUS PV ADAPTIVE TUNE—Same
as ACCUTUNE.
SP CHANG*
5 to 15 % SETPOINT CHANGE LOOP 1—The minimum setpoint
change on Loop 1 that will result in re-tuning must be
configured between 5 % and 15 %; i.e., if the range is 0 to
2400 and 5 % is configured, re-tuning will occur if the
setpoint change is 120 or larger.