Refrigerated Display-Case Evaporation Controller.. Used to control the evaporation functions of a refigerated display case.
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Network Variables | Configuration Properties |
nvoAcuatorOpening
nvoEvaporatorState
nviAirTemp
nviCutoutTemp
nviDefrostState
nviDifference
nviEvapInTemp
nviEvapOutTemp
nviForcedValue
nviPressure
nviSuperHeatRef
nviThermostatState
nvoDeltaTemp
nvoEvapInTemp
nvoEvapOutTemp
nvoPressure
nvoSuperHeatRef
nvoSuperHeatTemp
| nciLocationLabel
nciMaxSendTime
nciRefGlide
nciRefType
nciStartUpDly
nciStartUpOpen
nciSuperHtRefInit
nciSuperHtRefMax
nciSuperHtRefMin
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Details: |
| Resource Set:
| Standard 00:00:00:00:00:00:00:00-0 |
| Index:
| 66 |
| Obsolete:
| no |
| Key:
| 10011 |
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Inheriting:
| no |
Mandatory Network Variables |
| nvoAcuatorOpening | Valve opening.: The current opening degree of the valve, in percent of fully open.
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| Member Number:
| 1 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nvoEvaporatorState | Evaporator state.: The current state of the evaporator object.
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| Member Number:
| 2 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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Optional Network Variables |
| nviEvapInTemp | Evaporator Inlet Temperature.: These values indicate the current evaporator inlet (liquid line) temperature. The input can be used if the sensor is external to the evaporator object.
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| Member Number:
| 3 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nvoEvapInTemp | Evaporator Inlet Temperature.: These values indicate the current evaporator inlet (liquid line) temperature. The output can be used if the sensor is internal to the evaporator object.
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| Member Number:
| 4 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nviEvapOutTemp | Evaporator Outlet Temperature.: These values indicate the current evaporator outlet (suction line) temperature. The input can be used if the sensor is external to the vaporator object.
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| Member Number:
| 5 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nvoEvapOutTemp | Evaporator Outlet Temperature.: These values indicate the current evaporator outlet (suction line) temperature. The output can be used if the sensor is internal to the evaporator object.
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| Member Number:
| 6 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nviForcedValue | Forced Value.:
The nviForcedValve is used to force the valve to a given opening degree. The evaporator object will stay in this forced mode as long as SNVT_switch.state equals TRUE.
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| Member Number:
| 7 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nvoSuperHeatTemp | Super Heat Temperature.:
The nvoSuperHeatTemp indicates the true evaporator super heat temperature. This variable should be used only when both pressure & emperature are used for calculation. If only temperatures are used then the delta temperature output should be used.
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| Member Number:
| 8 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nviThermostatState | Thermostat State.: This NV indicates the current state of the Thermostat Object. There are currently three different control methods supported by the Thermostat Object (See PDF)
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| Member Number:
| 9 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nvoSuperHeatRef | Super Heat Reference Temperature.: The nvoSuperHeatRef indicates the current target evaporator super heat temperature.
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| Member Number:
| 10 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nviDefrostState | Defrost state.: This NV indicates the current state of the defrost object.
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| Member Number:
| 11 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nviAirTemp | Calculated Air Temperature.: This NV is the calculated case air temperature. An error on the sensor is indicated with the error value for SNVT_temp_p (0x7fff).
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| Member Number:
| 12 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nviCutoutTemp | Cut out Temperature.: This NV indicates the current cut out limit used by the thermostat object in its agorithms.
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| Member Number:
| 13 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nviDifference | Difference Temperature.: This NV indicates the value to be added to the nviCutoutTemp to get the thermostat cut in limit if cut in / out control is selected.
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| Member Number:
| 14 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nviSuperHeatRef | Super Heat Reference Temperature.: The nviSuperHeatRef is an override input for the target super heat reference. This input should be used when the object is in override.
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| Member Number:
| 15 | |
Base type:
| | | Direction:
| input | | Service:
| any |
|
| nviPressure | Liquid Line Pressure.:
The input variable would be included on nodes without the hardware interface to read a pressure sensor, whereas the output variable would be included on nodes with pressure sensor hardware.
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| Member Number:
| 16 | |
Base type:
| | | Direction:
| input | | Service:
| any |
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| nvoDeltaTemp | Delta Temperature.: This NV indicates the inferred evaporator super heat temperature. This variable should be used when pressure is not taken into account in the calculation.
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| Member Number:
| 17 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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| nvoPressure | Liquid Line Pressure.: The pressure of the refrigerant in the liquid (evaporator feed) line.
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| Member Number:
| 18 | |
Base type:
| | | Direction:
| output | | Service:
| any |
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Optional Configuration Properties |
| nciLocationLabel | Location: Provides descriptive physical location information related to the object.
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| nciMaxSendTime | Maximum send time.: The maximum period of time between consecutive transmissions of the current value.
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| nciSuperHtRefMax | Super heat reference maximum.: Maximum value for the target super heat network variable.
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| nciSuperHtRefMin | Super heat reference minimum.: Minimum value for the target super heat network variable.
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| nciSuperHtRefInit | Super heat reference initialization.: Default value for the super heat target network variable.
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| nciStartUpDly | Startup delay.: The time to delay after power-up, defrost, or pack fail.
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| nciStartUpOpen | Startup valve opening.: Maximum valve opening to use after power-up, defrost, or pack fail.
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| nciRefGlide | Refrigerant glide.: Used to characterize the glide of the refrigerant used.
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| nciRefType | Refrigerant type.:
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