Monitoring and Operating the Controller
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• The Timer is ready to be reset either via the RUN/HOLD key or by activating
Alarm 1.
When the Timer is “RESET”:
• Alarm 1 relay is inactive
• The timer display shows the configured timer period
• The time-out period can be changed at this time using the or keys.
• The Timer is ready for the next activation.
4.10 Accutune III
Introduction
Accutune III (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. The process need not be
in a static (lined out) state and may be dynamic (changing with a steady output).
Configuration check
Make sure:
• TUNE has been enabled see to Subsection 3.10 – Accutune Set Up Group for details.
Tuning indicators
A “T” will show in the leftmost alphanumeric of the upper display until tuning is
completed.
Operation
The Accutune III algorithm provides user-friendly, on-demand tuning in this controller.
No knowledge of the process is required at start-up. The operator simply initiates the
tuning while in the automatic mode.
Once Accutune III has been enabled in the TUNE setup group, either “SLOW” or
“FAST” tuning may be used. Which one is used is selected via the lower display during
normal operation.
For the SLOW selection, the controller calculates conservative tuning constants with the
objective of minimizing overshoot. If the controller determines that the process has
appreciable dead time, it will automatically default to use Dahlin Tuning, which produces
very conservative tuning constants. The SLOW selection may be useful for TPSC and
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