United Security Products AVD-45c Manuel Page 215

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1/03 UDC 6300 Process Controller Product Manual 201
5.20 Accutune, Continued
How TUNE
(Demand”) tuning
works
TUNE tuning provides virtually foolproof, trouble-free on-demand tuning
in the UDC6300 controller. No knowledge of the process is required at
start-up. The operator simply enters the desired setpoint and initiates the
tuning.
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 configured output limits) while allowing only
a very small Process Variable change above and below the SP during each
cycle.
The algorithm then calculates new tuning parameters and enters them into
the tuning group. A large “T” appears in the upper display
Starting TUNE
(Demand ) tuning
After “TUNE” or ‘TUNE+PV” has been enabled, use the procedure in
Table 5-38 to start tuning
Table 5-38 Procedure for Starting TUNE (Demand) Tuning
Step Action
1
Set the Setpoint to the desired value.
2
Switch to “Automatic” mode - Manual/Auto
key.
3
Initiate Tuning by:
• pressing the
key when the Lower Display
prompt = “TUNE-OFF”,
• pressing the Lower Display
and keys simultaneously, or
• using the Digital Input (if configured).
Aborting Tuning
If it is necessary to stop or abort the tuning process, press the
Manual/Auto key and the controller will return to Manual mode.
You can also disable “TUNE” OR “TUNE + PV” in the “ACCUTUNE”
OR “ACCUTUNE2” set up group.
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