Omron E5AC-T User Manual page 208

Description
Operation
When you autotune all PID sets, the PID sets are autotuned in order of the PID set numbers with the
fixed SP (FSP) as the lower limit (starting point) and the All PID AT Upper Limit SP as the upper limit
(ending point). (Ascending order is used for reverse operation and descending order is used for
direct operation.)
The Fixed SP parameter is overwritten while autotuning for all PID sets is executed. If you cancel
autotuning before it is completed, the current SP will remain as the value of the Fixed SP parameter.
If autotuning for all PID sets is completed normally, the setting of the Fixed SP parameter is returned
to the lower limit (starting point).
Example: The following example is for when the zone for PID set 2 contains the fixed SP (FSP)
(starting point) and the zone for PID set 7 contains the All PID AT Upper Limit SP (ending point).
Value
PID set 8
In this example, the All PID AT Upper Limit SP is set here.
PID set 7
In this example, the FSP (fixed SP) is set here.
PID set 2
PID set 1
Precautions for Correct Use
If any of the starting point (fixed SP (FSP)), mean values of the starting and ending points for the
PID set automatic selection zone upper limits, and the ending point (All PID AT Upper Limit SP)
are in the zone for the same PID set, the following order of priority is used for the autotuning SP.
Fixed SP (FSP) > All PID AT Upper Limit SP > Mean value of PID set upper limits
Example: If both the fixed SP (FSP) and the All PID AT Upper Limit SP are in the zone for PID set 2,
the fixed SP (FSP) is the SP for autotuning PID set 2.
E5@C-T Digital Temperature Controllers User's Manual (H185)
Autotuning is executed for the autotuning SPs for PID sets 2 to 7.
Autotuning is not performed for the zones for PID sets 1 and 8.
• The zone for PID set 2 contains the fixed SP (FSP), so the
Input indication range
autotuning SP for PID set 2 is the FSP.
upper limit
• The autotuning SPs for PID sets 3 to 6 will be the mean values.
• The zone for PID set 7 contains the All PID AT Upper Limit SP,
so the autotuning SP for PID set 7 is the All PID AT Upper
PID set 7 upper limit
Limit SP.
(6) Autotuning SP of PID set 7 = All PID AT Upper Limit SP
To (7) FSP (Fixed SP)
PID set 6 upper limit
PID set 2 upper limit
(1) Autotuning SP of PID set 2 = FSP (fixed SP)
PID set 1 upper limit
Input indication range lower limit
5 Advanced Operations
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