Executing Heating And Cooling Control; Heating And Cooling Control - Omron E5CN User Manual

Executing Heating and Cooling Control

4-4

Executing Heating and Cooling Control

4-4-1

Heating and cooling control

Dead band
Output
0
Cooling coefficient
Heating and cooling control can be used on E5CN-@2@@ controllers. Heating
and cooling control operates when "h-c: heating and cooling" is selected in
the "standard/heating and cooling" parameter (initial setting level). Select the
standard heating control or cooling control according to the following table:
Control Method
Standard control
Standard control
Heating and cool-
ing control
Heating and cool-
ing control
(Parameter default is heating control (standard).)
• When heating and cooling control is selected, the "dead band" and "cool-
ing coefficient" parameters can be used.
The dead band is set with the set point as its center on the E5CN-@2@@. The
dead band width is the set value of the "dead band" parameter (adjustment
level). Setting a negative value produces an overlap band.
Default is "0.0EU."
Dead band:
dead band width = positive
Heating side
Set point
If the heating and cooling characteristics of the control target greatly differ,
preventing satisfactory control characteristics from being obtained by the
same PID constants, adjust the proportional band (P) at the cooling side using
the cooling coefficient to balance control between the heating and cooling
sides. In heating and cooling control, P at the heating or cooling side is calcu-
lated by the following formula:
Control output 1 P = P
Control output 2 side P = P × cooling coefficient
The cooling coefficient is applied to control output 1 side P to obtain control
whose characteristics (control output 2 side P) differ from those on the control
output 1 side.
Setting
Direct/reverse
operation
Reverse operation
Direct operation
Reverse operation
Direct operation
Output
Cooling side Heating side
PV
0
Output
Control output 1 Control output 2
Control output -
(heat)
Control output -
(cool)
Control output Control output
(heat) (cool)
Control output Control output
(cool) (heat)
Overlap band:
dead band width = negative
Cooling side
Set point
Section 4-4
PV
47