Heating and HEX control in sequence

File: Heat HEX.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 HEX 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 valve and maximum HEX. The HEX can, however, be set to minimum by the "HEX min" flag. If the "Heating allowed" flag is false, the heating valve is closed. If the "HEX max" flag is true, the HEX is forced to max, if the "HEX min" flag is true, the HEX is forced to min. During this cases, the controlling is moved over to the heating valve.

Inputs

(Real) SP supply temperature, °C

(Real) Supply temperature, °C

(Binary) Normal control

(Binary) Heating allowed flag

(Binary) HEX Min flag

(Binary) HEX max flag

Outputs

(Real) HEX control signal 0 - 100%

(Real) Heat control signal 0 - 100%

Parameters

(Real) HeatingPBand 25 °C

(Real) HeatingITime 4 minutes

(Real) HEXPBand 25 °C

(Real) HEXITime 4 minutes

Public signals

(Real) Heating

(Real) HeatingPBand

(Real) HeatingITime

(Real) HEX

(Real) HEXPBand

(Real) HEXITime

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