Rockwell Automation 1771-TCM TEMPERATURE CONTROL - Manual (Page 54)

6–5 Tuning the Loops
Publication 1771Ć6.4.5 - January 1997
4. Select
Start Tuning.
Once the tuning process starts, the
Start Tuning selection becomes
Stop Tuning.
5. If at any time during the process you want to stop the auto-tuning,
select
Stop Tuning.
During auto-tuning, do not close the Tuning Assistant screen, as
this will prevent proper completion of tuning. You may minimize
the window if desired.
As the tuning process progresses, the tuning status for each loop
is reported as one of the following:
• Unknown
• In Process
• Successful
• Not Successful
When none of the loops are any longer reported as
In Process, the
auto-tuning is complete.
After auto-tuning is complete, you can monitor the the auto-tuning
results passed between the the TCM module and the PLC data table.
To monitor the auto-tuning results, from the
Module menu, select
Tuning Results.
The Auto-Tuning Result screen appears.
On this screen, for both heat and cool for each loop, the following
values are displayed:
•
controller gain
•
integral gain
•
derivative gain
•
slope (process gain for non-barrel loops)
•
time constant
•
dead time
Monitoring AutoĆTuning
Results