Section 3 Typical Control Examples
3-8
Typical Control
Examples
■ Settings for heating/cooling control
When heating/cooling control is selected, the "Dead band" and
"Cooling coefficient" settings can be used.
● Dead band The dead band is set centered on the SP. The dead band width is set
in "Dead band" in the "Adjustment level". Setting a negative value
changes the dead band to an overlap band.
• The initial setting is "0.00".
● Cooling coefficient When the heating characteristics of the object are different from the
cooling characteristics and satisfactory control is not possible using
the same PID parameters, use the cooling coefficient to adjust the
proportional band of cooling control output and thereby balance
heating and cooling control. The heating control output P and the
cooling control output P are as follows:
Heating P = P
Cooling P = Heating P
× Cooling coefficient
The cooling P is obtained by multiplying the heating P by the cooling
coefficient, and cooling output control is performed with different
characteristics than heating control output.
Output
PV
00%
0%
Dead band:
Dead band width = Positive
Overlap band:
Dead band width = Negative
Heat side P Cool side P
Cool sideHeat side
SP
Output
PV
100%
0%
Heat side P Cool side P
Cool sideHeat side
SP
Output
PV
100%
0%
Heat side P Heat side P × 0.8
Cool sideHeat side
SP
Output
PV
100%
0%
Heat side P Heat side P × 1.5
Cool sideHeat side
SP
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