Operation
12/00 UDC2300 Controller Product Manual 61
6.7 Accutune II
Introduction
AccutuneII (TUNE) may be used for self-regulating and single integrating processes. This
autotuning method is initiated on-demand, typically at initial start-up.
There are no other requirements necessary, such as prior knowledge to the process
dynamics or initial or post tune process line-out to setpoint or manual output.
Also, the setpoint value is not required to change in order to initiate the tuning process,
but the controller must be in the Automatic mode to start tuning.
Configuration check
Make sure:
• TUNE has been enabled see to Subsection 4.7 - Accutune Set Up Group for details.
• Key Enabled – see Subsection 4.5 – Tuning Set Up Group for details.
Tuning indicators
“TUNE” will flash in the upper display until tuning is completed.
Operation
“TUNE” (Accutune II) algortihm 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, you can start Accutune as shown in Table 6-7.
Table 6-7 Procedure for Starting “TUNE”
Step Operation Press Result
1
Switch to
“Automatic” Mode
MAN/AUTO
RESET
Until you “A” indicator is lit.
2
Initiate Accutune
AUTO
TUNE
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