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40 UDC 6300 Process Controller Product Manual 1/03

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.

• (SP Only) SP Tuning -SP Tune 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 work with 3 Position Step Control algorithm.

• (TUNE + PV) or (SP + PV) PV Tuning - The (TUNE) Demand Tuning

or the (SP Only) 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.

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United Security Products AVD-45c Manuel Page 54