Auto-Reset (Offset Correction) - Panasonic KT9 Instruction Manual

(B) In the case of a stable control
The AT process will fluctuate around the SV.
SV
Temperature
(C) In the case of a large difference between the SV and processing temperature as
the temperature is falling
When AT bias is set to 20 , the
higher than the SV.
Temperature
SV

8.3 Auto-reset (offset correction)

Auto-reset is performed to correct the offset at the point at which PV indication
is stabilized within the proportional band during the PD action.
Since the corrected value is internally memorized, it is not necessary to perform
the auto-reset again as long as the process is the same.
However, when the proportional band is set to 0, the corrected value is cleared.
SV
Temperature
AT starting point
(1)
(Fig. 8.2-2)
Temperature 20
(4)
AT starting point
(1)
(Fig. 8.2.3)
Offset span
Time
Time
(3)
(2)
AT process will fluctuate
higher than the SV
Time
(3)
(2)
Auto-reset is performed
Offset is corrected
36
(1) Calculating PID constant
(2) PID constant calculated
(3) Controlled by the PID
constant set by auto-tuning
at the temperature 20
(1) Calculating PID constant
(2) PID constant calculated
(3) Controlled by the PID
constant set by auto-tuning
(4) AT bias value
(Fig. 8.3-1)