8. ENGINEERING MODE
IMR01N12-E7
93
8.13 Autotuning 1 (AT1) (F53)
Autotuning 2 (AT2) (F54)
AT bias (1. ATb, 2. ATb)
Use to set a bias to move the set value only when Autotuning (AT) is activated.
Data range:
Input span to
Input span
Factory set value:
Input 1_AT bias (1. ATb): 0
Input 2_AT bias (2. ATb): 0
Related parameters:
PID/AT transfer (P. 101), AT action (P. 96)
Functional description:
The AT bias is used to prevent overshoot during Autotuning in the application which does
not allow overshoot even during Autotuning. RKC Autotuning method uses ON/OFF
control at the set value to calculate the PID values. However, if overshoot is a concern
during Autotuning, the desired AT bias should be set to lower the set point during
Autotuning so that overshoot is prevented.
Example: When AT bias is set to the minus (
) side.
Measured value (PV)
Set value (SV)
AT point
AT bias
Time