
206 UDC 6300 Process Controller Product Manual 1/03
5.20 Accutune™, Continued
TUNE+PV ADAPT or
SP+PV ADAPT
(Process variable
disturbances)
The (TUNE) Demand Tuning or the (SP Only) Setpoint Tuning portions
of these selections work as stated previously.
During Process Variable (PV) disturbances which result from non-
linearities, process dynamics, load changes or other operating conditions,
PV ADAPT will occur whenever a PV disturbance of 0.3% span or larger
occurs. When this condition exists, the controller monitors the process
response to determine whether there has been a true process change or a
momentary upset. It will take 1 and 1/2 process cycles around the setpoint
before any process recognition can occur.
For this configuration, the controller operates with only one set of Tuning
Parameters for each loop. The second set, normally used for Duplex
Output or for Keyboard, PV or SP Switching, is not used because
Adaptive Tune continually updates the tuning parameters based on the PV
deviation.
PV tuning indications
A small “T” is displayed in the upper display whenever PV ADAPT mode
is in progress. During this time, changes to the configuration parameters
are permitted. However, this may cause the PV ADAPT process to abort.
The selection of Fast or Normal criteria has no effect on PV Adapt.
Aborting PV Adaptive
Tuning
If it is necessary to stop or abort the tuning:
• press the Manual/Auto key to return to Manual mode. This will cause
an immediate abort of tuning.
• Disable “TUNE+PV” or “SP Only + PV” in the Accutune Set Up group
at function prompt “ACCUTUNE” or “ACCUTUNE2”.
Continued on next page
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