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If the proportional band (P)/heating proportional band (Ph) is set to 0 (0.0%), the auto tuning cannot be performed. To
perform the auto tuning, set proportional band (P)/heating proportional band (Ph) to other than 0.
For details on the auto tuning function, refer to the following.
Page 176, Section 4.6
Remark
The proportional band (P) is the variation width of deviation (E) necessary for manipulated value (MV) to vary 0% to 100%.
The following formula shows the relationship between deviation (E) and manipulated value (MV) in proportional action.
Kp is proportional gain. The following formula shows proportional band (P) in this case.
When the value of the proportional band (P) is increased, the proportional gain (Kp) decreases. Therefore, the manipulated
value (MV) for variation of the deviation (E) becomes small.
When the value of proportional band (P) is decreased, the proportional gain (Kp) increases. Therefore, the manipulated
value (MV) for variation of the deviation (E) becomes large. The following figure shows the proportional band (P) in reverse
action.
100%
0%
Deviation
(E)
Manipulated
value (MV) to
deviation (E)
Manipulated value
(MV)
Temperature
process value
(PV)
Proportional band (P)
Current temperature
process value (PV)
Set value
(SV)