N30 Supervisory Controller User`s Manual: Chapter 9: Working with
Contents
1. 1 Therefore e Optimal Start Time 0 1 15 2 5 0 1 2254 5 22 5 5 27 5 28 minutes The optimal start process turns on the Zone WC Warmup Cooldown Mode object at 6 32 a m 28 minutes prior to the scheduled 7 00 a m start time The goal of optimal stop is to set the heating cooling zone to vacant zone temperature settings prior to actual zone vacancy It must do this while the zone is still occupied without causing comfort level alarms The Optimal Start object calculates the number of minutes before the zone changes from occupied to vacant It then uses the same equation for deriving the optimal start time to determine the earliest stop time To ensure occupancy comfort it sets the temperature differential to the edited Temp Temperature Differential attribute 9 4 N30 Supervisory Controller User s Manual Adaptation Attributes Each day at occupancy the optimal start process adapts the building Heating and Cooling Constant It checks if the Zone Temperature converged to within the edited temperature differential of the Heating setpoint or Cooling setpoint If the Zone Temperature did not converge the building Heating and or Cooling Constants are increased This increase moves the optimal start time closer to the earliest start time defined for the system If the Zone Temperature converges to within the edited Temperature Differential of the Heating setpoint or Cooling setpoint prior to occupancy the buildings H2. an Optimal Start Object To add an Optimal Start object 1 Browse to and highlight the Energy container 2 Press the F3 Add key The Add Object list appears 3 Highlight Optimal Start and press Enter The first of two Optimal Start object attribute screens appears Figure 9 1 Note Use the and keys to page to other screens Dean ADMIN Wed 22 Sep 1999 07 57 CDT Object Object Name Ty Description Object Type OPTIMAL START Object Category HVAC OST Type Heating Cooling Enabled True Control Adaptation Enabled True Zone Schedule Obj Zone Occ Mode Obj Zone WC Mode Obj Cooling Setpoint Heating Setpoint Zone Temperature F3 Save Fa Cancel Page Enter an alphanumeric string Figure 9 1 Optimal Start Object Attribute Screen 1 of 2 N30 Supervisory Controller Users Manual 9 11 Aspen Elementary ADMIN Thu 11 Jan 2001 19 51 CST spen Elementar aner t mal art Outdoor Air Temp Se Setup Cooling Design Temp 95 0 deg F Cooling Constant 5 0 Heating Design Temp 5 0 deg F Cooling Deadtime 10 minute Min Prestart Time 20 minute Heating Constant 10 0 Max Prestart Time 120 minute Heating Deadtime L0 minute Max Prestop Time 0 minute Temp Differential 3 0 delta Display Precision 10ths F3 Save F4 Cancel Page Enter object and attribute name Figure 9 2 Optimal Start Object Attribute Screen 2 of 2 4 Fill in the fields using Table 9 3 Table 9 3 Attribute Entry Requirements Screen Attribute Re
3. start and stop times for the current day for the Optimal Start object to run Zone Occ Mode Obj Zone Occupied Mode Object Identifies the object used to command a zone to occupied or unoccupied This object must be specified in the zone schedule It is commanded by scheduling to Occupied and by the Optimal Start object if the Maximum Prestop attribute is enabled Zone WC Mode Obj Zone Warmup Cooldown Mode Object Identifies the object used to command a zone to Warmup or Cooldown mode This object may be the same as the Zone Occupied Mode object This object is commanded by the Optimal Start object at the optimal start time and may be released at the occupied time Cooling Setpoint Identifies the attribute of an object used to define the zone occupied target cooling temperature This object may be the same as the Heating Setpoint object Heating Setpoint Identifies the attribute of an object used to define the zone occupied target heating temperature This object may be the same as the Cooling Setpoint object Zone Temperature Identifies the attribute of an object used to determine the actual zone temperature 9 6 N30 Supervisory Controller User s Manual Outdoor Air Temp Identifies the attribute of an object used to determine the actual outside air temperature If this attribute is not specified or is offline the outdoor air temperature is not used in the Optimal Start object s calculations and it is assumed to be
4. within the design temperatures Cooling Design Temp Indicates the highest outside temperature at which the cooling system maintains zone comfort in the Cooling mode The default units Imperial or SI of this attribute are based on the Default Base Units attribute in the Device object Heating Design Temp Indicates the lowest outside temperature at which the heating system maintains zone comfort in the Heating mode The default units Imperial or SI of this attribute are based on the Default Base Units attribute in the Device object Min Minimum Prestart Time Lists the minimum period of time before occupancy to start the heating cooling system This time allows for the required amount of air changes in the zone prior to occupancy latest optimal start time Max Maximum Prestart Time Lists the maximum period of time required to bring the zone up to occupancy setpoint temperature under the worst conditions earliest optimal start time Max Maximum Prestop Time Lists the maximum period of time that the heating cooling system can be shut down and still maintain the occupied zone temperature until entering the unoccupied mode earliest optimal stop time By setting this time to zero the default value optimal stop is disabled N30 Supervisory Controller User s Manual 9 7 Temperature Units Lists the units associated with the attributes for temperatures The default units of this attribute are determined by the defaul
5. N30 Supervisory Controller Users Manual 9 1 Chapter 9 Working with Optimal Start Objects Introduction The Optimal Start OST feature reduces energy consumption by keeping a facility in its unoccupied mode for as long as possible for example in the morning and putting it in unoccupied mode as soon as possible for example at night without sacrificing comfort This chapter describes how to e add an Optimal Start object e edit an Optimal Start object e command an Optimal Start object e delete an Optimal Start object November 01 2001 Johnson Controls Inc www johnsoncontrols com Code No LIT 6892090 Software Release 5 0 9 2 N30 Supervisory Controller User s Manual Key Concepts Optimal Start Object The goal of Optimal Start is to reach either the Heating setpoint or Cooling setpoint at occupancy The Optimal Start object selects the appropriate setpoint depending on current temperature To meet this goal the Optimal Start object calculates e building Heating and Cooling constants that represent the rate at which the temperature inside the building changes e temperature differences between the Zone Temperature and the Heating setpoint or Cooling setpoint e how many minutes of precooling or preheating are required based on the above difference e optimal start time when the Zone WC Warmup Cooldown Mode object is controlled by the optimal start process The Optimal Start object interacts with Schedul
6. The Optimal Start object supports the commands described in Table 9 4 9 14 N30 Supervisory Controller User s Manual Table 9 4 Supported Commands Command Description Cancel Prestart Delays pending start until latest prestart time Only valid during Prestart and before the Optimal Start time Cancel Prestop Cancels the pending stop Only valid during Prestop and before the Optimal Stop time Enable Allows the object to perform its calculations once a minute Disable Prevents the object s functionality no calculations take place 4 Press Enter Deleting an Optimal Start Object To delete an Optimal Start object 1 Browse to and highlight an Optimal Start object 2 Press Enter to open the object 3 Press the Delete key 4 Press the Tab key to confirm the deletion
7. acebar and Backspace key to view and select options True Enabled False Not enabled Name of the Schedule object scheduling the Zone Occ Mode Obj Name of the object used to command a zone to occupied or unoccupied Name of the object used to command a zone to Warmup or Cooldown mode It may be the same as the Zone Occ Mode Obj Name of the object and analog attribute used to define the zone occupied target cooling temperature Name of the object and analog attribute used to define the zone occupied target heating temperature Name of the object and analog attribute used to determine the zone temperature Name of the object and analog attribute used to determine the outside air temperature Minimum Value 20 Maximum Value 120 Units Temperature Units Minimum Value 35 Maximum Value 90 Units Temperature Units Minimum Value 0 Maximum Value 240 Units Minutes Minimum Value 5 Maximum Value 480 Units Minutes Minimum Value 0 Maximum Value 60 Units Minutes Use the Spacebar and Backspace key to view and select options Refer to Display Precision Enumeration Set in Appendix A Object Enumeration Sets of the Object Dictionary LIT 694980 Minimum Value 1 Maximum Value 999 Minimum Value 5 Maximum Value 480 Units Minutes Minimum Value 1 Maximum Value 999 Minimum Value 5 Maximum Value 480 Units Minutes N30 Supervisory Controller User s Manual 9 13 5 P
8. e objects N2 Binary objects and N2 Analog objects in an Optimal Start application For more information refer to Appendix C Building an Optimal Start Application LIT 6892330 in this document Optimal Start Equation The following equation illustrates how the optimal start time is derived Heating or Cooling Constant Temperature Differential 2 Deadtime Optimal Start Time Table 9 1 Optimal Start Equation Variables Variable Description Heating or Cooling This variable is the building Heating or Cooling Constant Constant parameter divided by 100 Temperature This variable is the difference between the Zone Differential Temperature and the Heating Setpoint or Cooling Setpoint Units delta deg F or delta deg K Deadtime This variable is the amount of time required to raise or lower the Zone Temperature 1 0 degree Units minutes N30 Supervisory Controller User s Manual 9 3 Optimal Start Example Optimal Stop For an example of the optimal start process assume e The Zone Occ Occupied Mode object is scheduled weekly to start at 7 00 a m and stop at 5 00 p m e Zone Temperature 55 F e Heating Setpoint 70 F e Deadtime 5 minutes e Building Heating Constant since in Heating mode 10 The optimal start process has run for several days and the building Heating Constant has been adjusted to 10 based on past performance e Temperature Differential 70 F 55 F 15 F e Heating Constant 10 100 0
9. eating and or Cooling constants are decreased This decrease moves the optimal start time closer to the occupancy start time defined for the system The values of an object s attributes determine how the object will operate The Optimal Start object attributes described below are listed in the order that they appear on the screen For additional information about the Optimal Start object and its attributes refer to the Object Dictionary Object Name Identifies the object on the user interface Description Provides optional information to further describe the object Object Type Indicates the kind of object such as Schedule N2 Analog Input or Optimal Start Object Category Classifies the object to aid in the determination of user access capability and message routing OST Type Defines the supported configuration When the zone is in a mode not available as an OST Type and not supported by the Optimal Start object the Present Value is Idle Enabled Indicates if an object is active and executing an operational condition N30 Supervisory Controller User s Manual 9 5 Adaptation Enabled Indicates whether the Optimal Start object should use adaptive learning to change the building heating and cooling constants and cooling and heating deadtimes Zone Schedule Obj Zone Schedule Object Identifies the object that schedules the Zone Occupied Mode object This object must be defined in the schedule and have valid
10. quired Default Options Range Area Object Object Name No Blank Maximum 32 characters Invalid characters If not completed the system assigns a name Description No Blank Maximum 40 characters Object Type Yes Optimal Start Default is preset and cannot be changed Object Yes HVAC Use the Spacebar and Backspace key to Category view and select options HVAC Fire Security Services Administrative OST Type Yes Heating Cooling Use the Spacebar and Backspace key to view and select options Cooling Only Heating Cooling Heating Only Enabled Yes True Use the Spacebar and Backspace key to view and select options True False Continued on next page 9 12 Screen Attribute Required Default Area Cont Control Adaptation Yes True Enabled Zone Schedule Yes Blank Object Zone Occ Yes Blank Mode Object Zone WC Yes Blank Mode Object Cooling Yes unless Blank Setpoint Heating Only Heating Yes unless Blank Setpoint Cooling Only Zone Yes Blank Temperature Outdoor Air No Blank Temp Setup Cooling Design Yes 95 0 deg F or Temp 35 0 deg C Heating Yes 5 0 deg F or Design Temp 20 0 deg C Min Prestart Yes 20 minute Time Max Prestart Yes 120 minute Time Max Prestop Yes 0 minute Time Display Yes 10ths Precision Cooling Yes 5 0 Constant Cooling Yes 10 minute Deadtime Heating Yes 10 0 Constant Heating Yes 10 minute Deadtime N30 Supervisory Controller User s Manual Options Range Use the Sp
11. ress the F3 Save key 6 Check the User Assistance area of the screen to verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 7 7 Press any key to continue 8 Press the F4 Cancel key to return to the container hierarchy Editing an Optimal Start Object To edit an Optimal Start object 1 Browse to and highlight an Optimal Start object 2 Press Enter to open the object Note Additional attributes appear Refer to the Object Dictionary for more information 3 Press the F3 Edit key The first of the two Optimal Start object attribute screen appears Figure 9 1 and Figure 9 2 Note Use the and keys to page to other screens 4 Edit the fields using Table 9 3 5 Press the F3 Save key 6 Check the User Assistance area of the screen to verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 7 7 Press any key to continue 8 Press the F4 Cancel key to return to the container hierarchy Commanding an Optimal Start Object To command an Optimal Start object 1 Browse to and highlight an Optimal Start object 2 Press the F2 Command key The Optimal Start Command field appears 3 Use the Spacebar and the Backspace key to cycle through the list until the desired command appears
12. s for that day N30 Supervisory Controller User s Manual 9 9 Procedure Overview Table 9 2 Working with Optimal Start Objects To Do This Add an Optimal Start Object Edit an Optimal Start Object Command an Optimal Start Object Delete an Optimal Start Object Follow These Steps Browse to and highlight the Energy container Press the F3 Add key Highlight Optimal Start and press Enter Fill in the fields using Table 9 3 Press the F3 Save key to save the object Check the User Assistance area of the screen to verify if the save was successful or if there were errors Press any key to continue Press the F4 Cancel key to return to the container hierarchy Browse to and highlight an Optimal Start object Press Enter to open the object Press the F3 Edit key Edit the fields using Table 9 3 Press the F3 Save key Check the User Assistance area of the screen to verify if the save was successful or if there were errors Press any key to continue Press the F4 Cancel key to return to the container hierarchy Browse to and highlight an Optimal Start object Press the F2 Command key Use the Spacebar or the Backspace key to cycle through the list until the desired command appears Press Enter Browse to and highlight an Optimal Start object Press Enter to open the object Press the Delete key Press the Tab key to confirm the deletion 9 10 N30 Supervisory Controller User s Manual Detailed Procedures Adding
13. t base units attribute in the Device object These attributes are e Cooling Design Temperature e Heating Design Temperature e Zone Temperature at Start e Temperature Differential Relative Temp Units Units associated with the Temp Differential attribute Display Precision Indicates the rounded position and decimal places to display for this object Cooling Constant Defines the rate at which the zone cools down after equipment startup If adaptation is enabled this constant is adapted without user intervention If adapting and cooling and heating setpoints are the same attribute the cooling constant is adapted even if the mode is not cooling meaning both constants change Cooling Deadtime Lists the time required after startup to lower the temperature by one degree The Optimal Start object s algorithm adapts this value if adaptation is enabled If adapting and cooling and heating setpoints are the same attribute the cooling deadtime is adapted even if the mode is not cooling meaning both deadtimes change Heating Constant Defines the rate at which the zone heats up after equipment startup If adaptation is enabled this constant is adapted without user intervention This attribute does not have a unit If adapting and cooling and heating setpoints are the same attribute the heating constant is adapted even if the mode is not heating meaning both constants will change 9 8 N30 Supervisory Controller User s Man
14. ual Heating Deadtime Lists the time required after startup to raise the temperature by one degree The Optimal Start object s algorithm adapts this value if adaptation is enabled If adapting and cooling and heating setpoints are the same attribute the heating deadtime is adapted even if the mode is not heating meaning both deadtimes change Temp Temperature Differential Lists the temperature value added to and subtracted from the zone setpoint to define a deadband used in the Optimal Start object s calculations Present Value Represents the current value of the object Present Value appears to the right of the object name in the container hierarchy after the object is created Possible values are e Idle Waiting for next occupied time for a supported mode heating or cooling e Prestart Heating Heating Optimal Start time is pending e Prestart Cooling Cooling Optimal Start time is pending e Calculating Deadtime Valid only if Adaption Enabled e Calculating Constant Valid only if Adaption Enabled e Occupied e Prestop Waiting to reach optimal stop time e Not Operational Optimal Start object is not operational due to errors in its connection status to other required objects You can determine the specific problem by viewing the other status attributes The Optimal Start object is Not Operational if the Zone Occ Mode Obj attribute is in the schedule but there are no valid start and stop time
Download Pdf Manuals
Related Search