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4/00 UDC 3300 Process Controller Product Manual 47
3.9 Accutune Set Up Group
Introduction
The Accutune Set Up group offers these selections:
• FUZZY
Fuzzy Overshoot Suppression—Uses fuzzy logic to suppress or
eliminate any overshoot that may occur when the PV approaches
setpoint.
• TUNE
Demand Tuning—The tuning process is initiated through the operator
interface keys or via a digital input (if configured). The algorithm then
calculates new tuning parameters and enters them in the tuning group.
TUNE does operate with 3 Position Step Control.
• SP*
SP Tuning—SP tuning continuously adjusts the PID parameters in
response to setpoint changes. You can select tuning on minimum
setpoint changes of 5 % up to 15 % span. Perform SP tuning after you
have configured the controller.
SP tuning does not operate with 3 Position Step Control algorithm.
• TUN+PV*
or
SP+PV*
PV Tuning—The (TUNE) Demand Tuning or the (SP) Setpoint
Tuning portions of these selections work as stated above. PV Adapt
will occur during Process Variable (PV) disturbances (0.3 % span or
larger) which result from non-linearities, process dynamics, load
changes, or other operating conditions. When this condition exists, the
controller monitors the process response for 1 and 1/2 process cycles
around the setpoint to determine whether there has been a true process
change or a momentary upset.
Process retuning occurs as the process dynamics are learned. When the
process is being learned with possible retune, a t is shown in the upper
left display digit.
*SP + PV Tuning not available on Basic Model DC330B.