5-46 configuration
(FISHER”J
To halt the process before tuning is complete, do one of the following:
n
Press the M button. This switches the controller directly to the
manual mode, halting the process.
n
Press the TUNE button. The controller returns to the original state
before tuning starts (auto, manual or remote). The values of the
PID tuning parameters also return to their original state.
5.10.3
Before tuning begins, the process must be
stabilized near the desired working point.
Autotuning should not be used for processes with
long deadtimes, i.e. where process deadtimes
exceed 2X the dominant time constant of the loop.
The autotuner has a time-out limit of 32 hours. If tuning ceases
because this limit is exceeded, the controller returns to its original
state, and displays error code 108. Fault conditions that may arise
during autotuning are listed in Appendix A, error code 105 to 108.
If the Autotuner function is interrupted before
completion, no PID parameters are updated.
The controller returns to automatic operation when tuning is complete.
The Autotuning function may be used with any available output
option, however, with positioning motor (raise/lower) output, an
actuator for positional feedback must be used or the autotuning
function will not work. In addition, autotuning can only be initiated by
local control and the ramping function must not be in effect.
Autotuner Operation
The user may configure the autotuner function to be active using
FCODE 135. If Option 3 is selected, the Autotuner function will
automatically cease if any controller alarm becomes active during the
autotuning cycle.
uM6.1:DPR900:9102
May 1991
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