C2-21
IM 34M06H62-02E 2nd Edition : June 2008-00
C2.4.4 Heating/Cooling ON/OFF Control
In Heating/Cooling ON/OFF Control, the module turns on or turns off the heating or
cooling output depending on the deviation between the control set point (CSP) and the
PV. To select Heating/Cooling ON/OFF Control, set the Control Type Selection (OT)
parameter to 3. For details, see Section C2.1, "Control Type Selection."
The value of the heating or cooling output is either 0% or 100%.
You can specify a dead band around the CSP for turning on the heating and cooling
outputs.
You can also specify a hysteresis for on/off or off/on transitions in the heating or cooling
output.
Conditions for turning on and turning off heating control output
On condition: (CSP - PV) DB/2 + HYS/2
Off condition: (CSP - PV) < DB/2 - HYS/2
Conditions for turning on and turning off cooling control output
On condition: (CSP - PV) -(DB/2 + HYS.C/2)
Off condition: (CSP - PV) > -(DB/2 - HYS.C/2)
Figure C2.12 Heating/Cooling ON/OFF Control (with positive dead band)
Figure C2.13 Heating/Cooling ON/OFF Control (with negative dead band)
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