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PID Auto tuning (AT)
The P, I and D terms need to be "tuned" to suit the dynamics of the process being controlled.
Temperature control using digital PID controllers have automatic auto-tune functions. During the
auto-tune period the PID controller controls the power to the process and measures the rate of
change, overshoot and response time of the plant. This is often based on the Zeigler-Nichols
method of calculating controller term values. Once the auto-tune period is completed the P, I &D
values are stored and used by the PID controller.
We recommend doing this AUTO TUNE if there is a temperature overshooting above your set
point
1. Press
several times scroll to the parameter PASS. Set the PASS value to1000
2. Press
and hold until appears
on the display then release.
3. Press
and hold at least 5 seconds. The TUNE indicator will begin to flash and the auto-
tuning procedure is beginning.
After the Auto-Tuning process is completed, the TUNE indicator will stop flashing and the unit will
revert to PID control by using its new PID values. The PID values obtained are stored in
nonvolatile memory.