parameter value.
If you want to escape from auto tuning status, press and hold the key for about 2 seconds until the "At"
parameter appear again. Change “At” from “on” to “oFF”, press to confirm, then the auto tuning
process will be cancelled. (P.S. If parameter “SPr” activate and the heating was running, then will stop the “At”
until completed the heat up process. ) If the controller was applied on heat/cooling duel output system, P I D
parameter need separate two group to process auto tuning. When the controller was cooling control from AUX,
this time can enable auto tuning to obtain P2, I2, d2.
Note 1: At AI-526P, when auto tuning was running, the program timer will stop until tuning finish.
Note 2: If the setpoint is different, the parameters obtained from auto-tuning are possible different. So you’d better
set setpoint to an often-used value or middle value first, and then start auto-tuning. For the ovens with good
heat preservation, the setpoint can be set at the highest applicable temperature. Depending on the system,
the auto-tuning time can be from several seconds to several hours.
Note 3: Parameter CHYS (on-off differential, control hysteresis) has influence on the accuracy of auto-tuning.
Generally, smaller value of CHYS, will get higher precision of auto tuning result. Too large value of CHYS,
will made the controller out of control, so, CHYS is recommended to be 2.0.
Note 4:
AI series instrument has the function of self-adaptation. It is able to learn the process while working.
he control effect at the first run after auto tuning is probably not perfect, but excellent control result
will be obtained after a period of time because of self-adaptation.
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