8. PARAMETER DESCRIPTION
IMR02C15-E4
8-131
Dummy
F52
AT differential gap time
Use to set an ON/OFF action differential gap time for Autotuning (AT).
This function prevents the AT function from malfunctioning caused by noise.
Data range Factory set value
0 to 50 seconds
10
Related parameters
Parameter setting mode:
• Autotuning (AT) (P. 8-24)
Description of function
In order to prevent the output from chattering due to the fluctuation of a Measured value (PV) caused
by noise during autotuning, the output on or off state is held until “AT differential gap time” has
passed after the output on/off state is changed to the other. Set “AT differential gap time” to “1/100 ×
Time required for temperature rise.”
[Example]
A: AT cycle time when the AT differential gap time is set to 0 second
The output chatters due to the fluctuation of the Measured value (PV) caused by noise, and
autotuning function is not able to monitor appropriate cycles to calculate suitable PID values.
B: AT cycle time when the AT differential gap time is set to “Time corresponding to 0.25 cycles.”
The fluctuation of a Measured value (PV) caused by noise is ignored and the Autotuning function
is able to monitor appropriate cycles to calculate suitable PID values.
Measured value (PV)
Set value (SV)
Time
T start
A
Fluctuation of measured value (PV)
caused by noise
AT differential gap time
B
The factory set value of the AT cycle is 1.5 cycles.
ATH
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