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4/00 UDC 3300 Controller Product Manual 199
Using SP tuning at
start-up for duplex
(heat/cool)
After SP or SP+PV has been enabled, use the procedure in Table 5-38 to
use SP tuning at start-up for duplex (heat/cool) control.
Table 5-38 Procedure for Using SP Tuning at Start-up for Duplex
Step Action
1
Put the controller into manual mode— MANUAL/AUTO
key.
2 Heat Zone:
• Adjust the Output to a value above 50 % and at least 5 % lower than the
normal heating setpoint value.
• Let the PV stabilize.
• Press the MANUAL/AUTO
key to start tuning for Heat zone.
The controller will switch to automatic mode and the process will start to
move toward the setpoint and will line out with the proper Heat tuning
constants. A large T appears on the left side of the upper display to indicate
that SP tuning is in progress.
When the T disappears, tuning is completed and final values are entered for
PID set 1 parameters in the Tuning group.
3 Cool Zone:
• Adjust the Output to a value below 50 % and at least 5 % above the
normal cooling setpoint value.
• Let the PV stabilize.
• Press the MANUAL/AUTO
key to start tuning for Cool zone.
The controller will switch to automatic mode and the process will start to
move toward the setpoint and will line out with the proper Cool tuning
constants. A large T appears on the left side of the upper display to indicate
that SP tuning is in progress.
When the T disappears, tuning is completed and final values are entered for
PID set 2 parameters in the Tuning group.
SP tuning after start-up
SP tuning 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 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 or SP+PV in the Accutune Set Up group at function prompt
ACCUTUNE or ACCUTUN2.