Cooling and heating control in sequence

File: Heat Cool.doc

Last edition: 4 of March 2003

Author: Mikael Krantz

History: 96-02-13/MK First released version.

96-10-03/MK Updated to Menta 1.20

97-09-02/MK Updated to Menta 3.0

98-03-09/MK Unit corrected.

98-12-30/MK New filename

2003-03-04/MK Updated to Menta 4.0

Description

Heating and cooling valve control in sequence, with separate P-band and I-times. If the flag for "Normal Control" is true, the main controller is activated, in other cases, the controller is set to closed valves. If the "Heating allowed" flag is false, the heating valve is forced to closed position. If the "Cooling case" flag is false, the cooling valve is forced to closed position.

Inputs

(Real) SP supply temperature, �C

(Real) Supply temperature, �C

(Binary) Normal control

(Binary) Heating allowed flag

(Binary) Cooling case flag

Outputs

(Real) Cooling control signal 0 - 100%

(Real) Heat control signal 0 - 100%

Parameters

(Real) CoolingPBand 25 �C

(Real) CoolingITime 4 minutes

(Real) HeatingPBand 25 �C

(Real) HeatingITime 4 minutes

Public signals:

(Real) Cooling

(Real) CoolingITime

(Real) CoolingPBand

(Real) Heating

(Real) HeatingITime

(Real) HeatingPBand

---