6 USING THE PRE-TUNE FACILITY
The Pre-Tune facility is used to set the Digital Controller Programmer’s PID control
parameters to values which are approximately correct in order to provide a base
from which the Self-Tune facility may subsequently optimise tuning. Pre-Tune may
be activated as follows:
1. With the Digi tal Con trol ler Pro gram mer in Base Mode (with the RUN and
HLD in di ca tors OFF), press the SET UP key un til the Mes sage Dis play
shows:
and the lower Main Dis play shows:
2. Press the MODE and Up keys to change the lower Main Dis play to:
in di cat ing that the Pre- Tune fa cil ity is now ac ti vated.
NOTES
1. If the process variable is within 5% of the input span from the setpoint,
the Pre-Tune facility cannot be activated and any attempt to do so will
have no effect.
2. Since the Pre-Tune facility is a single-shot operation, it will automatically
de-activate itself once the operation is complete.
To de-activate the Pre-Tune facility manually (with the Digital Controller
Programmer in Base Mode), press the SET UP key to obtain the same Message
Display as above; then press the MODE and Up keys to change the lower Main
Display from On to OFF.
6-1
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