20 - ATR144 - User manual
8.5 Synchronized Tuning
Set sYNch . on parameter 36 t u n .1 .
This procedure has been conceived to calculate correct PID
values on multi-zone systems, where each temperature is
influenced by the adjacent zones.
Writing on word modbus 1210 the controller works as follows:
Word
value
Action
0 Tune off
1 Command output OFF
2 Command output ON
3 Tune active
4 Tune completed: command output OFF (read only)
5
Tune not available: softstart function enabled (only
reading)
Here below the functioning for regulation loop: the master
switches-off or turns-on all zones (value 1 or 2 on word 1210)
for a time long enough to create inertia on the system.
At this point the autotuning is launched (value 3 on word 1210).
The controller executes the procedure for the calculation of
the new PID values. When the procedure ends, the controller
switches off the command output and selects the value 4 on
word 1210. The Master, always reading word 1210, will control
the various zones and when all will have finished, it will set to
0 the value of word 1210: the various devices will regulate the
temperature independently, with the new calculated values.
N.B. The master must read the word 1210 at least every
10 seconds or the controller will automatically exit the
autotuning procedure.
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