Athena 6075 series, Инструкция по эксплуатации, Страница: 24 / 39

5.3
Tuning the Controller
5.3.1
Introduction
5.3.2
The Series 6075 is a state-of-the-art automatic tuning PlD temperature con-
troller. The user has the option of automatically selecting the controller’s
PlD settings or manually setting the unit as desired.
Tuning a 3-Mode controller involves three (3) major adjustments; propor-
tional Band (Gain), Rate (Derivative) and Reset (lntegral) action. Athena has
simplified the adjustment procedure with the incorporation of the Rate and
Reset settings into one adjustment "RT" which is displayed in seconds of
Rate time. The Reset time is automatically set at six (6) times the displayed
Rate values.
Automatic PlD Tuning procedure
NOTE FOR OPTlMUM RESULTS
Set point must be a minimum of 100°F above the starting or ambient
temperature when tuning is initiated for accurate tuning. Less than
100ºF may not yield effective tuning settings.
Multi-zone applications require Auto-Tune units on each zone and
simultaneous warmup.
Loss of power or a turn-off during the Auto-Tune cycle requires a restart
from ambient (or at least I00ºF rise to set point) for reliable PlD
values.
Change of state processes, i.e. solid to liquid or liquid to gas, may
introduce erroneous tuning parameters during process warmup.
Tuning should be done after the change has occured
5.3.2.1
Damping Settings
Heat Damping Choices (“-At-“: position # 10)
To allow the controller to provide automatic tuning for a wide variety of pro-
cesses that may
exhibit
varying heating characteristics and/or varying heat-
ing capabilities, the controller offers three damping choices:
00
Low Damping - For processes that (any combination of the following)
- are adequately powered with excellent coupling between heater and
probe.
20
- require quick response and the tightest possible temperature control
is desired
1.
2.
3.
4.