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10. AT
In order to set each value of P, I, D and ARW automatically, the AT process should be
made to fluctuate to obtain an optimal value. One of 3 types of fluctuation below is
automatically selected.
For DC voltage, current inputs, the AT process will fluctuate around the SV for conditions
of [1], [2] and [3]. (p.80)
Notice
• Perform AT during the trial run.
• If PID zone function is set to “Used”, perform AT in each PID zone.
In (Fig. 10-1), perform AT at PID zone values 1 and 2.
Step
1
2
3
4
5
(Fig. 10-1)
• If AT is cancelled during this process, each value of P, I, D and ARW reverts to the values
before the AT was performed.
• AT will be forced to stop if it has not been completed within 4 hours.
• If Direct/Reverse action is switched during AT (by selecting ‘003 Direct/Reverse action’
in [Event input allocation]), the AT stops.
• During AT, none of the setting items can be set.
• If power failure occurs during AT, the AT will stop.
• Sometimes the AT process will not fluctuate if AT is performed at or near room
temperature. Therefore, AT might not finish normally.
PID zone
value 2
PID zone
value 1
PID zone parameters of PID zone
value 1 are calculated by
performing AT.
PID zone parameters of PID zone
value 2 are calculated by
performing AT.
