3
Initiating the Autotune Sequence: Full Mode
1. Press hold the P key for five seconds. “
Atun
” will appear in the upper red LED and “
oFF
”
will appear in the lower green LED
2. Momentarily press the down arrow. When “
FASt
” appears in the lower green LED, press
the down arrow again to show “
FULL
”. Press the P key again to select the full mode.
3. Press the P key eight times. At this point, the TUNE LED illuminates and the setpoint
and actual temperatures are displayed.
4. Use the up and down arrows on the controller (
Figure 3
) to adust the temperature
setpoint to the desired reading.
The ITC2 will now execute a full autotune. This can take from 10 to 60 minutes,
depending on the zone conditions.
During a full autotune, the controller will overshoot the set point
several times, by as much as 40°C. If there are any components in
the heated zone that might be damaged by this, set the temperature
40°C lower than the final setpoint. When the TUNE LED goes out,
indicating that the autotune procedure is completed, set the
temperature as desired
5. Allow an additional 15 minutes for further temperature stabilization of the heated
zone.
When to Repeat Autotune
Autotune should be repeated any time there are physical changes to the heated zone or
if there is a large change in the set point temperature.
Figure 3
: ITC2 controls and display
ACTUAL
TEMPERATURE
TEMPERATURE
SETPOINT
AUTOTUNE
INDICATOR
OUTPUT
INDICATOR
PROGRAMMING
KEYS
UP AND DOWN ARROWS
