Installation and Operation
Laboratory Vacuum Ovens
5.6
Auto Tuning the Controller
Factory settings are provided for general purposes, but your
process can be enhanced through the auto tune feature. For a
given process temperature and product load, auto tuning
maximizes the performance of the chamber by operating with the
quickest response and minimal temperature overshoot.
To auto tune the controller.
1. Load the chamber with materials that have the same mass
and thermal characteristics as a typical product load.
2. Operate the chamber to the process temperature.
3. Press and hold
SETlENT
for
3 seconds to display the
parameter of the Operating Parameter menu.
4.
Press and release
SETIENT
to show the At parameter.
5.
Press and release the arrow buttons to show on in the lower
display.
6.
Press
SETIENT
once to enter the auto tune mode and exit the
Operating Parameters menu.
The controller will cycle three times through a heating and
cooling pattern, measuring the characteristics of the load and
chamber temperature controls. During the auto tuning, At will
alternately flash with the measured temperature
(PV) to indicate
that the auto tuning is in progress. The length of time for the auto
tune varies with the load, chamber size and temperature selected.
The auto tune is completed when the regular display of the
measured temperature is shown. The chamber should now
operate to the process temperature with the given product load,
with the quickest response and minimal temperature overshoot.
If the process temperature or load changes significantly, another
auto tune session may be necessary to optimize the chamber
performance.
