United Security Products AVD-45c Manual Pagina 219

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1/03 UDC 6300 Process Controller Product Manual 205
5.20 Accutune, Continued
SP Only tuning
(after Start-up)
SP Only tune will occur whenever the controller is in automatic mode and
a setpoint change occurs which is greater than the previously configured
minimum setpoint change value.
The controller will delay using any setpoint changes for 30 seconds to
enable it to calculate whether to “SP” tune or not. But, if the controller is
toggled between LSP1 and LSP2 or if any other key (such as
LOWER/DISPLAY) is pressed, the setpoint change is immediate.
A large “T” is displayed in the upper display whenever tuning is in
progress. During this time, no changes to the configuration parameters,
including the setpoint, are permitted.
Aborting SP Only
Tuning
If it is necessary to stop or abort the tuning:
• press the Manual/Auto
key to return to Manual mode. This will cause
an immediate abort of tuning.
• Disable “SP Only” or “SP Only + PV” in the Accutune Set Up group at
function prompt “ACCUTUNE” or “ACCUTUNE2”.
Re-Tuning
The controller will evaluate current tuning as SP changes occur. When re-
tuning is required, the controller operates in automatic mode and identifies
new tuning constants.
At that point, the “T” disappears and tuning values are entered and used
until re-tuning occurs again.
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