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User must reconfigure all required settings before using the instrument in a live
application.
Automatic Tuning Menu
The Automatic Tune Menu is used engage the Pre-tune and/or Self-tune facilities to assist
the user in setting up Proportional band(s), Integral and Derivative parameter values.
Pre-tune can be used to set PID parameters approximately. Self-tune may then be used to
optimise the tuning if required.
Pre-tune can be set to run automatically after every power-up by enabling Auto Pre-Tune.
The TUNE indicator (LED 3)* will flash while pre-tune is operating, and is continuously on
whilst Self-tune is operating. If both Pre-tune and Self-tune are engaged the AT indicator will
flash until Pre-tune is finished, and is then continuously on.
Note:
Self-Tune will not engage if either primary or secondary control outputs are set for On-Off
control.
Pre-Tune will not engage if either primary or secondary control outputs are set for On-Off
control, during setpoint ramping, if a profile is running or if the process variable is less than
5% of the input span from the setpoint.
Navigating Automatic Tuning Menu
Press D to move forward or A to move backwards through the selections.
Press B or C to engage or disengage the tuning as required.
Hold down Dand press Cto return to the Main Menu
Scrolling “Help Text” is shown at the bottom of the screens to aid navigation.
*Provided the function of LED3 has not been changed (LED functions can be altered using
the PC Configuration Software).
Table 19. Automatic Tuning Menus Screens
Ï Automatic Tuning Menu:
Automatic Tuning Mode
Unlocking
Enter correct code number to access the Automatic Tuning Menu.
Pre-Tune w Turns Pre-Tune on/off. Pre-Tune is disabled in On-Off Control Mode;
if the PV is less than 5% of span from SP; during Profiles or if the
Setpoint is Ramping.
Pre-Tune Status Shows the current Pre-Tune status. Active or Inactive.
Self-Tune Turns Self-Tune on/off. Self-Tune is disabled in On-Off Control
Mode.
Self-Tune Status Shows current Self-Tune status. Active or Inactive.
Auto Pre-Tune Enable Enables/Disables Automatic Pre-Tune. When enabled, this attempts
to perform a Pre-Tune at every power-up. Normal Pre-Tune
engagement rules are applied (see Pre-Tune above)
Profiler Setup Menu
Refer to the Profiler Option section of this manual for more details about the profiler features.
Screens marked º will not time-out automatically. They must be completed for a valid profile
to be created.
Table 20. Profiler Setup Menu Screens
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