Accutune Ii; Fuzzy Overshoot Suppression - Honeywell UDC 2300 User Manual

4.7 Accutune II

Operation
"TUNE" (Accutune II) algorithm provides foolproof, trouble-free on-demand
tuning in the UDC2300 controller. No knowledge of the process is required at
start-up. The operator simply initiates the tuning while in the automatic mode.
The UDC controller immediately starts controlling to the setpoint while it identifies
the process, calculates the tuning constants and enters them into the Tuning
group, and begins PID control with the correct tuning parameters. This works
with any process, including integrating type processes, and allows retuning at a
fixed setpoint.
The tuning sequence will cycle the controller's output two full cycles between 0 %
and 100 % (or low and high output limits) while allowing only a very small
Process Variable change above and below the SP during each cycle. "TUNE"
flashes in the upper display until tuning is completed.
After "TUNE" has been enabled:
Start Tuning by pushing the AUTOTUNE key while in Automatic control
mode.
To abort Accutune and return to the last previous operation (SP or output level),
press MAN-AUTO/RESET key to abort the Accutune process.
Completing Accutune
When Accutune is complete, the calculated tuning parameters are stored in their
proper memory location in the controller, and the controller will control at the
local setpoint using the newly calculated tuning constants.
4.8

Fuzzy Overshoot Suppression

Introduction
Fuzzy Overshoot Suppression minimizes Process Variable overshoot following a
setpoint change or a process disturbance. This is especially useful in processes
which experience load changes or where even a small overshoot beyond the
setpoint may result in damage or lost product.
Configuration
To configure this item, refer to Section 3 - Configuration:
Set Up Group "ATUNE"
Function Prompt "FUZZY"
Select "ENAB"(enable) or "DIS" (disable) Use
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Operation
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