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5.1.3 Using Autotune PT (Push-to-Tune) Function .0, Option 2
Used to fine tune difficult applications at setpoint. Useful if the
setpoint or thermal conditions are substantially changed.
During PT tuning some overshoot will occur. If this is
unacceptable, temporarily lower the setpoint. PT tunes the
parameters listed above except DAC. Proportional cycle time is
recalculated but needs manual confirmation.
Figure 5-2. Autotune PT
To change Option 0 to
Option 1:
To start Autotune process:
"AT" display will alternate with
process temperature display.
STEP ACTION DISPLAY
3
4
Press
Option (flashing)
Press P
1.
0
A T
T E M P
NOTE
The Autotune algorithm can be tried on any process.
However, it is designed to work best for heating
processes when the setpoint is at least 100°F (50°C)
above ambient. Other processes may need to be
manually tuned for best results.
Temperature
Start PT
setpoint
prop band
new PID
values
entered
Time
(100% output power)
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