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Demand Limiting and Load Rolling Technical Bulletin

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1. Graphic Symbol 0 Operating Instr 20 Meter System Name AHU1 Object Name METER End of Interval System Name AHU1 Object Name EOI Tariff Level System Name AHU1 Object Name TRFLVL Current Target Level 2 Demand Limiting Shedding Tariff 1 Target 900 KW Tariff 2 Target 700 KW Tariff 3 Target 800 KW Tariff 4 Target 500 KW Target Elevation 10 Demand Interval 15 minutes Sensitivity medium W Tracking Period daily v Amount Shed 150 KW Amount to Shed 50 KW Report Type STATUS STATUS NORMAL ALARM Messages Alarm 37 Load Rolling Shedding Tariff 1 Target Tariff 2 Target Tariff 3 Target Tariff 4 Target Amount Shed Amount to Shed 100 KW 120 KW 90 KW 130 KW 100 KW 100 KW Figure 7 Load Group Focus Window dildgrpf 26 Demand Limiting and Load Rolling Technical Bulletin Table 3 Load Group Focus Window Boxes Box Name Associated Loads Reports Locked Trigger Locked Status EOI Status Tariff Status Current Period Consumption at Tariff n n 1 4 Previous Period Consumption at Tariff n n 1 4 Instantaneous Demand Interval Demand Total Shed Current Target Level Demand Limiting Description When selected displays a dialog box that allows you to add to or modify loads in this Load Group by providing access to the Load Definition and Focus windows Figure 9 Box that indicates whether
2. After a download Load Rolling shed status is set to Monitor Only regardless of the shed status prior to the download To enable shedding use the Load Rolling Shedding LR_SHED command Energy Data Access At any OWS you can look at energy consumption data including reports on DLLR performance This information is in the Load Group Focus window Figure 7 In addition to Focus window information the Demand Limiting feature automatically generates the Utility Profile for the period Figure 2 You can display or print the Utility Profile Note You must define both Demand Limiting and Load Rolling to generate the Utility Profile Setup Demand Limiting and Load Rolling Technical Bulletin 11 Utility Profile ltem Edit View Action GoTo Accessory NETWORK MAP Utility Profile Item Description Status AHU1 LGroup1 Load Group One Normal Value Date Current Period since 5 01 93 Tariff 1 Total Consumption 160 000 Measured Peak 1 200 5 10 93 Projected Peak 1 230 5 10 93 Tariff 2 Total Consumption 130 000 Measured Peak 1 000 5 04 93 Projected Peak 1 400 5 04 93 Tariff 3 Total Consumption 150 000 Measured Peak 1 300 5 10 93 Projected Peak 1 350 5 10 93 Tariff 4 Total Consumption 180 000 Measured Peak 1 600 5 09 93 Projected Peak 1 600 5 09 93 Previous Period Tariff 1 Total Consumption 200 000 Measured Peak 1 400 4 02 93 Projected Peak 1 500 4 02 93 Item Description Status AHU1 LG
3. Box Name Cont Demand Limiting Target Elevation Demand Limiting Demand Interval Demand Limiting and Load Rolling Technical Bulletin 21 Description Valid Entry Used only by the Fixed Window algorithm EOI pulse from the 0 to 99 utility company and is ignored if the Sliding Window algorithm is being used It specifies in percent the amount by which the currently active DL target demand is increased at the beginning of the Demand Interval The Target Elevation then decreases linearly to 0 in the first half of the interval Figure 5 The Fixed Window algorithm only projects average demand for the time remaining in the demand interval By increasing the target demand at the beginning of the interval larger loads causing a higher instantaneous demand can be started at the beginning of the interval where the average over the entire interval may still be below the overall target demand The net effect of target elevation is to defer aggressive load shedding to the second half of the fixed demand interval 110 Target Elevation of 10 108 Target 106 in 104 102 tT 98 EOI Pulses 96 94 0 50 100 Demand Interval in target Figure 5 Target Elevation of 10 A time period over which the power consumption is averaged for 3 60 minutes billing purposes The Demand Interval is defined by the utility During a billing period Tracking Period the demand interval with the largest energy consumption is
4. The Triggers attribute merely indicates which command is in effect The units specified for the ACM object defined as the demand meter Does not apply if a demand meter is not defined Description Name of the feature currently controlling the load either Demand Limiting or Load Rolling If neither None is displayed The time the load must stay off before being released Also defines the time at which the Comfort Override point is sampled to check if the environment is normal The load s Minimum Shed time must be greater than or equal to the Minimum Off Time The time the load must stay on before being a candidate for shedding The load s Minimum Release time must be greater than or equal to the Minimum On Time Indicates whether the load is temporarily locked When locked the load is not a candidate for shedding Indicates whether the load is currently under control of either DL or LR When under control status is Shed When not under control status is Released Type Range Boolean Oor1 String 6 char maximum Type Range Boolean Oor1 Integer 1 to 255 Integer 1 to 255 Boolean 1or2 Boolean Oor1 Code Default Value O N unlocked 1 Y locked Code Default Value 0 Demand Limiting 1 Load Rolling 0 unlocked 1 locked 0 released 1 shed Usage Usage PMI Definable Writable JC B Writable Range Check Definable Wri
5. 4 period while Tariff 1 was active 0 to 999999999 period while Tariff 2 was active 0 to 999999999 period while Tariff 3 was active 0 to 999999999 period while Tariff 4 was active 0 to 999999999 PMI Flag indicating whether Y or N the Boolean SCAN STATDISP Report Locked Comm Disabled Status Prefix object sends COS reports to Oor 1 operator devices Use the Lock and Unlock Reports commands to start and stop report sending for the object The Report attribute merely signifies which command is in effect communications are disabled Oor 1 between the object and its controller When the object is disabled it cannot trigger processes send COS reports to operator devices or accept any commands except Enable Use the Comm Enable and Comm Disable commands to start and stop communications The Scan attribute merely signifies which is in effect 0 N Not locked 1 Y Locked Flag indicating whether Y or N Boolean 0 N Enabled Definable 1 Y Disabled Prefix specifying the current status of Integer the Load Group object The prefix 0 to 15 appears before the object name in summaries No prefix indicates normal status 0 Blank normal 2 RPT reports locked 3 TRG triggers locked 9 ALM alarm 12 DIS comm disabled 14 UNR unreliable 15 OFF offline 16 DCT disconnected PMI Triggerable Continued on next page Demand Limiting and
6. A Load Group object is considered offline when the NCM containing the Load Group object is offline Largest demand interval peak detected in the last period while Tariff 1 was active Does not apply if a demand meter is not defined Largest demand interval peak detected in the last period while Tariff 2 was active Does not apply if a demand meter is not defined Largest demand interval peak detected in the last period while Tariff 3 was active Does not apply if a demand meter is not defined Largest demand interval peak detected in the last period while Tariff 4 was active Does not apply if a demand meter is not defined Largest projected demand interval peak detected in the last period while Tariff 1 was active Does not apply ifa demand meter is not defined Largest projected demand interval peak detected in the last period while Tariff 2 was active Does not apply if a demand meter is not defined Type Code Range Default Value String 24 char maximum Integer 0 No report 0to6 1 Critical 1 2 Critical 2 3 Critical 3 4 Critical 5 5 Follow up 6 Status String 8 char maximum Boolean 0 N Online 0or1 1 Y Offline Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Usage Definable Writable Definable Writable JC B Writable Range Chec
7. Shed candidates for Load Rolling must be Priority 3 Shed candidates for Demand Limiting can be any priority from 1 to 4 Temporarily inhibits a load from being a shed candidate You can modify this field while adding the load or with the commands listed in Table 11 The command can be issued at any time If you set this parameter to Y Yes while the load is under control of DL and or LR the load completes its shed and release cycle before the lock takes effect The time that the load must remain On or for multistate loads switched to a state higher than the Shed State before either feature considers it a viable shedding candidate The longest time that the load can remain Off or for multistate loads switched to its Shed State under DLLR control The Comfort Override check which occurs at the Minimum Shed Time can release the load earlier Note Do not use short shed times one minute The DLLR and Local Load Restore Task Minute Timers are started separately The DLLR task sheds the load and Local Load Restore Task restores them Depending on when the timers are started the shed time will vary between 1 and 59 seconds The real shed time varies in the range of those timers The difference of the timers changes after a load NC reboots and the timer of the Local Load Restore Task restarts The state to which the load should be switched when shed under DLLR control For BD and BO objects this field is not editable and shows S
8. demand profile should track consumption for each tariff period This information helps you select an appropriate setting for DL Sensitivity and Targets There are two ways to gather and use this information Use the Trend feature to graph the Interval Demand parameter for a few weeks and set the energy usage Target to a value less than the largest peaks Look at the facility s utility bill and set the energy usage Target a few percent below the peak Demand Limiting and Load Rolling Technical Bulletin 13 Utility Company Parameters Gather data on consumption charges For DL you need to know e What is the interval duration defined by the utility If the utility uses a 15 minute interval you must define DL with a 15 minute interval If the utility provides an End of Interval EOI pulse then you should make provisions for supplying the pulse as a binary input to the DL feature Specifying an EOI input automatically selects the Fixed Window algorithm and the feature s peak demand projections and records correspond more closely to those of the utility company e What is the billing period You use this information to set the Tracking Period parameter e What are the premium charges for demand interval peaks Are the charges tied to a time of day day of week or season of year Does the utility provide multiple tariffs and if so does it provide a signal pulse indicating a change from one tariff to the next This information help
9. for example to switch among the various target levels Demand Limiting and Load Rolling Technical Bulletin 3 DLLR also supports two mutually exclusive methods for calculating the projected demand using either e asliding time window algorithm with an operator specified Demand Interval and Demand Target or e a fixed time window algorithm that synchronizes the Demand Interval to a utility company supplied End of Interval EOI pulse and which can use an operator specified Target Elevation at the beginning of the interval to defer shedding until the second half of the interval This document describes features of DLLR and how to e define load groups e define loads Key Concepts Demand Limiting and Load Rolling Technical Bulletin Demand Limiting Process DL repeats the following process once each minute l 2 DL reads the meter input DL projects the consumption for the Demand Interval If no loads were available for shedding DL generates a report when the average demand exceeds the currently active DL target DL projects demand for the Demand Interval If projected demand is over the currently active peak demand target DL calculates the required correction This correction is the goal for DL load shedding If the projected demand is above the currently active target DL selects available Priority 4 loads until the load shedding goal is reached DL sheds released eligible loads in rotation For information on Tar
10. high speeds you may shed it to low instead of Off Demand Limiting and Load Rolling Technical Bulletin 15 Shedding Priorities The DLLR shed candidates can be any Binary Data BD Binary Output BO Multistate Data MSD Multistate Output MSO or Multiple Command MC objects that exist on the Metasys Network The Binary and Multistate Data objects can be used in conjunction with GPL or JC BASIC for group start and equipment interlocking applications Refer to the respective object technical bulletins for details on defining these objects The DLLR parameters are defined independently during Load definition not when you define the BD BO MSD MSO or MC object Load Rolling Actions that reduce consumption are candidates for load rolling To find candidates for load rolling 1 Establish which loads are expendable for example ventilation fans 2 Assign a Priority 3 to these loads This priority identifies them as shed candidates for both DL and LR Demand Limiting Actions that defer but do not reduce consumption are DL shed candidates To find candidates for demand limiting 1 Identify any loads that might be deferred without significant impact on facility function either during periods that you schedule or under conditions you can define 2 Ifthe impact on the facility of shedding one of these loads is minimal assign a priority of 4 to the load 3 Ifthe impact of shedding one of these loads is slight but
11. is reset to O at the start of each period Does not apply if a demand meter is not defined TOT_SHED Total Shed The total amount of energy turned off Float pt Object by both Demand Limiting and Load pto Default Rolling this minute 999999 TRACKPER Tracking Specifies when the current period Integer 0 Hourly Definable Period information resets and a new period Q to4 1 Daily Writable begins _ Range 2 Weekly Check 3 Monthly 4 Manual TRGT_ELV Target The amount in percent by which Integer Definable Elevation the currently active DL target 0 to 99 Range demand is increased at the Check Continued on next page beginning of the Demand Interval The Target Elevation then decreases linearly to zero in the first half of the interval Used only by the Fixed Window algorithm EOI pulse 46 Demand Limiting and Load Rolling Technical Bulletin Attribute Cont Description S W Name TRIGGER UNITS Table 10 Load Attributes Attribute S W Name CNTL_FEA LMIN_OFF LMIN_ON LOCK LSTATUS Continued on next page PMI Label Triggers Locked PMI Label Controlling Feature Minimum Shed time Minimum Release time Load Locked Load Status Flag indicating whether Y or N triggers are currently locked for the object When triggers are locked the triggerable attributes of the object cannot trigger control processes Use the Lock and Unlock Triggers commands to start and stop triggers
12. name when writing the logic When omitted the attribute name is assumed by the program Means a JC BASIC process can modify write to an attribute Means the attribute can cause trigger a control process Means the software verifies that JC BASIC has correctly written to modified the attribute Means the attribute is available in the GPL process Connection menu Means the attribute value is shown in a Focus window Default The value in brackets appears in the attribute field when you first enter the Object Definition window This remains the attribute value until you change it ASCII alphanumeric characters such as System Object name 0 or 1 with O and 1 representing logical states such as true and false Whole numbers from 32767 to 32767 such as 22 Values that contain decimal points such as 67 5 The code default value column shows numbers and American Standard Code for Information Interchange ASCII text The numbers are used when defining the object in DDL and the ASCII text is used when defining the object online or through GPL For example 0 N unlatched where 0 is used in DDL N is used in GPL and online Demand Limiting and Load Rolling Technical Bulletin 37 Table 9 Load Group Attributes Attribute S W Name ALR_MSG ALR_RPT C_PD PK C_PD_PK2 C_PD_PK3 C_PD_PK4 C_PD_PPK C_PD_PP2 C_PD_PP3 Continued on next page PMI Label Alarm Message Report Type Alar
13. normally acceptable assign a priority of 2 or 3 to the load For example if water temperature is at least 105 F the water heater can be turned off briefly with only a minor potential effect on users 4 Review all loads that do not have a priority Identify any that could be shed as a last resort to avoid utility peak demand charges Assign a priority of 1 to these loads 16 Demand Limiting and Load Rolling Technical Bulletin Shed Times To establish shed times determine the following e How long can the load be off or in its Shed State if specified as other than Off without significant loss to facility performance e Once released how long before the load can again be considered for shedding e Is an override required to handle special cases of interaction Modifying and Deleting Load Groups and Loads Use the Load Group Focus and Load Focus windows to modify settings made in the Definition windows You can delete loads or delete an entire Load Group To delete a Load Group first delete the Load Windows loads associated with the group You also can issue operating commands Table 11 to the DLLR features using the Load Group Focus window Refer to the Operator Workstation User s Manual for information on displaying Focus windows Table 1 describes the Load windows used with the DLLR features Table 1 Load Windows Window Load Group Definition Window Load Group Focus Window Associated Loads Dialog Bo
14. or not Y or N COS reports are sent to Operator Workstations Y means reports are locked not sent Box that indicates whether or not Y or N this object s triggerable attributes will trigger control processes Y means triggers are locked control processes are not triggered The object s current condition The current condition of the End of Interval EOI object The current condition of the Tariff Level object The energy amounts consumed at each Tariff level since the period started At the end of the current period these values transfer to the corresponding Previous Period Consumption at Tariff n n 1 4 fields then the fields are reset to zero These fields are blank if DL is not defined The energy amounts consumed at each Tariff level at the end of the previous period Values are transferred from the corresponding Current Period Consumption Tariff n n 1 4 fields These fields are blank if DL is not defined The rate of consumption or the amount of energy being consumed in the current minute The average of instantaneous demands during an interval specified by the DL Demand Interval parameter on the Load Group Definition and Focus windows The power turned off between the DLLR features this minute The state to which the Tariff Level selector object is currently switched Box that indicates whether the feature is Undefined Monitor Only or actively Shedding loads When Monitor Only no control actions occur but the
15. the peak demand The peak demand in a billing period determines the demand charge The default is 15 minutes Note Ifthe Fixed Window algorithm EOI pulse from the utility company is being used this value is normally ignored because the EOI pulse defines the Demand Interval However you should still enter the correct value for the utility company s interval because the algorithm uses this value if the EOI input becomes unreliable or goes offline Continued on next page 22 Demand Limiting and Load Rolling Technical Bulletin Box Name Description Valid Entry Cont Demand Limiting The tuning factor in the Demand Limiting algorithm It replaces the Low Medium Sensitivity projection time attribute in the Load Group Focus and Definition High windows The Sensitivity attribute is applicable to the Sliding Window algorithm only the Fixed Window algorithm remains unaffected The Sensitivity attribute allows you to more accurately tune the Demand Limiting algorithm for moderate Low normal Medium or aggressive High shedding 500 Uncontrolled Demand Ni Low Shedding Low ae 480 7 A 460 7 Demand kW hr 440 7 Normal Shedding Medium Aggressive Shedding High 420 7 400 T T T T T T T T T T T T T T T Time Hours shedding Figure 6 Demand Profile A low setting allows you to start shedding loads later shedding over a shorter period of time By using this setting you reduce the amount o
16. which the End of Interval input exists 8 character System Name maximum Continued on next page Box Name Cont End of Interval Object Name Tariff Level System Name Demand Limiting and Load Rolling Technical Bulletin 19 Description Valid Entry The name of the End of Interval input object 8 character The End of Interval EO object supplies the DL feature with the maximum demand interval synchronizing pulse provided by some utility companies For example in some countries the power station distributes the pulse over the power lines and special equipment can be used to filter the pulse from the power line to activate a simple switch indicating the end of the power company s demand interval If an EOI input is specified the DL feature automatically uses a Fixed Window algorithm for calculating projected demand This algorithm uses a time window that does not slide The projection time starts with the whole window size at the beginning of the window and decreases to zero at the end of the window The window is synchronized with the utility company s window by the EOI pulse If an EOI input is specified it must e bea Bl object e reside on the same NCM as the Load Group object e be connected to a hardware device that is polled with Priority 1 In order to ensure accurate time synchronization the trunk to which this device is connected should not be overloaded with other Priority 1 devices If the EOI input become
17. 2 is active The level below which the operator wants to keep demand peaks when Tariff 3 is active The level below which the operator wants to keep demand peaks when Tariff 4 is active The EOI defined flag is set when the EOI system and object names are defined Type Range Boolean Oor1 String 8 char maximum Boolean Float pt 0 to 999999 Integer 3 to 60 Integer 1to3 Float pt 0 to 999999 Boolean Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Boolean Oor1 Code Default Value 0 No 1 Yes 0 DL not defined 1 DL defined Medium Low High 0 Monitor only 1 Shedding 0 Not defined 1 Defined Usage Definable Writable JC B Writable PMI Definable PMI Definable Definable Writable JC B Writable Range Check PMI PMI Definable Range Check Definable Range Check Definable Range Check Definable Range Check 40 Demand Limiting and Load Rolling Technical Bulletin Attribute Cont Description S W Name PMI Label EOI_OBJ End of Specifies the name of the Bl object EOI_STAT EOI_SYS EOI_UNR GRAPHIC INSTRUCT INST_DMD INTV_DMD LR_ADDED Continued on next page Interval Object Name End of Interval Status End of Interval System Name End of Interval Unreliable Graphic Symbol Operating I
18. 49 Command Description Cont Control Process or Workstation Multiple Command Action Menu Command Source NT Feature Object LR_SHED Load Rolling Shed enables load LR_SHED LR_BEGIN in Shedding by the Load Rolling Scheduling feature Window LR_TARGT Load Rolling Target sets a new Tariff LR_TARGT n target n 1 4 for demand Value Level reduction 0 3 RESETPER Reset Period moves Load Group RESETPER information for the current period to the previous period and then clears the information in the current period UNL_LOAD Unlock Load restores a load to S O Name of consideration as a shed candidate Object UNL_REP Unlock Reporting allows the object UNL_REP to send COS reports to operator devices The current state of the unlocked attributes is compared to the state when the attributes were locked to see if COS reporting is required UNL_TRIG Unlock Triggers allows the object to UNL_TRIG trigger control processes This applies to all triggerable attributes of the object JEAHNSON CONTRSLS Controls Group 507 E Michigan Street P O Box 423 Milwaukee WI 53201 Operation Set LR Operation Reset Operation Unlock Communication Unlock Reporting Communication Unlock Triggers NA Scheduling OWS NA Scheduling OWS MC JC B Writable NA Scheduling OWS NA Scheduling OWS NA Scheduling OWS NA Scheduling OWS www johnsoncontrols com Published in U S A
19. 999999 Float pt 1 to 999999 Integer 0 to2 0 state 0 1 state 1 2 state 2 Code Default Usage Definable Writable JC B Writable Range Check Definable Writable Definable Writable Definable Writable Range Check Definable Writable Range Check Definable Writable Range Check Definable 48 Demand Limiting and Load Rolling Technical Bulletin DLLR Commands Table 11 DLLR Commands Command DISABLE DL_MON DL_END in Scheduling Window DL_SHED DL_BEGIN in Scheduling Window DL_TARGT ENABLE LOC_LOAD LOC_REP LOC_TRIG LR_MON LR_END in Scheduling Window Description Control Command Source NT Operator Process or Workstation Multiple Command Command Action Menu Object Communication Disable stops Not calculations triggering of control Applicable processes sending of COS reports NA to operator devices and accepting commands except for Enable Demand Limiting Monitor inhibits DL_MON further load shedding by DL does not affect LR shedding All calculations are continued Previously shed loads are released as appropriate at Minimum or Maximum Shed Time Demand Limiting Shed enables load DL_SHED shedding by the Demand Limiting feature Demand Limiting Target sets anew DL_TARGT Tariff n target n 1 4 for the peak Value demand limit Level 0 3 Communication Enable allows all NA calculations triggering of
20. EL DL 100 l0g bd_load5 10g bd_load6 Available to shed DL LR priority 1 200 0 priority 2 200 0 totals 1400 0 Load Ciri Load Rating Min Max Shed Rel Shed inom pri ick sit feat Bl s2 S3 On Off State Left Lefi 10gibd_loadl 1 N REL DL 100 0 o 1 2 0 0 0 10g bd_load2 1 N REL DL 100 0 0 1 2 0 0 0 10g bd_load3 2 N REL DL 100 0 0 1 2 0 0 0 10g bd_load4 2 N REL DL 100 0 0 1 2 0 0 0 10g bo 1 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 3 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 5 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 7 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 1 2 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 3 2 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 5 2 1 3 N REL DL 100 0 0 2 2 0 0 0 10g bo 7 2 1 3 N REL DL 100 0 0 2 2 0 0 0 4 N 0 o 1 2 0 0 0 4 N 0 0 1 2 0 0 0 Figure 12 Dynamic Load Summary The Dynamic Load Summary is useful in determining what a particular Load Group is doing at any given minute The data is non refreshing but can be refreshed manually from the Action menu See Table 7 for a description of the data displayed in the Dynamic Load Summary 34 Demand Limiting and Load Rolling Technical Bulletin Table 7 Dynamic Load Summary Description Heading Available to shed DL and LR Item Load pri Ick stat Ctrl feat Load Rating S1 S2 or S3 Min On Max Off Shed State Rel Left Shed Left Description For each of the four load priorities the number represents the amount of energy that the Demand Lim
21. Group Focus window are the same as those in the Load Group Definition window Some of the fields that you could edit in the Load Group Definition window you cannot edit in the Load Group Focus window for example Meter and the Targets The Associated Loads button at the top of the Load Focus window provides access to the Associated Loads dialog box and the Load Definition and Focus windows The Load Summary button just below the Associated Loads button provides access to the Dynamic Load Summary see the Dynamic Load Summary section in this document Demand Limiting and Load Rolling Technical Bulletin 25 Load Group Focus Item Edit View Action GoTo Accessory BLDG 1 DEMAND LOAD1 Load Group 1 System Name Object Name Expanded ID DEMAND LOAD1 LOAD GROUP 1 Current Period since 5 01 93 12 04 Consumption at Tariff 1 160 000 KWH Consumption at Tariff 2 150 000 KWH Consumption at Tariff 3 144 000 KWH Consumption at Tariff4 80 000 KWH Previous Period Consumption at Tariff 1 200 000 KWH Consumption at Tariff 2 160 000 KWH Consumption at Tariff 3 178 000 KWH Consumption at Tariff4 90 000 KWH Instantaneous Demand 950 KW Interval Demand 945 KW Total Shed 150 KW NETWORK MAP ASSOCIATED LOADS LOAD SUMMARY Reports Locked N Trigger Locked N Disabled N Status Normal EOI Status Reliable Tariff Status Reliable Flags Auto Dialout
22. JAHNSON Technical Bulletin CONTRSLS Issue Date April 17 2003 Demand Limiting and Load Rolling Demand Limiting and Load Rolling DLLR ccconnccnconoonnnnnnnnnnonono 2 A O ie 2 Key CONCOP S 20121002 tn nt a tn tt dai 4 Demand Limiting POCOS ii A A io tas 4 DLLR Object Demand Limiting EquatiONS oooocccccccccnononononcncncnonananannoncncnnnnnnan nn nncnnnnnnnns 6 Esad Rolling Proces S cestas celce al irc aaea a aa Aa aAa 9 AVADE AE E E onlay chee dens id 10 SOU O O T N A A AET 11 Design Considerations 0d A AA ti 12 e A 15 A o 16 Modifying and Deleting Load Groups and Loads occcooocococcccccccconananannncnnncnonnnana no ncnnnnnnnns 16 Load WINGOWS nished As 16 Load Group Definition Window ccceccceecceecceeeeeeeeeeeeeeeeeeeeeneeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeeeeess 17 Load Group FOCUS WindOW oooccncccnnnccncnnnncnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnenineninnnns 24 Associated Loads Dialog Box iii ld 28 Load Definition Window oooocooccinnnnnnnccncnnncnnnnnnnonennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnneninnninnnnss 29 Load FOCUS WIN Wii A A E 32 Dynamic Load SUMMA Yuca 33 Network Failure Operation rerien a a E a T 34 Detailed Procedures coccion a aa e ia a tada int 35 Defining Load Grou Ps iii A A E 35 Definida E E E O de E ENAT 35 Load Group and Load Attribute Tables oooooonccnnnnnnininicnnnccocccoccnnncnanonancnnncnnncnnncnnnnnnnnnnns 36 DLER Command e E E chen duces cuasavuccs
23. Load Rolling Technical Bulletin 45 Attribute Cont Description Type Code Usage S W Name PMI Label Range Default Value STATUS Status Specifies whether the Load Group Integer 0 Normal Triggerable object has normal or alarm status Q0to6 2 Alarm SYSTEM System System in which the object belongs String When you are Definable Name The system must already exist in the g char defining an network maximum Object the PMI defaults to the current system TOT_CONS Total Total energy accumulated while Float pt PMI Consumption Tariff 1 was active as measured by Q to at Tariff 1 the demand meter since the period 999999999 started It is reset to 0 at the start of each period Does not apply if a demand meter is not defined TOT_CON2 Total Total energy accumulated while Float pt PMI Consumption Tariff 2 was active as measured by Q to at Tariff 2 the demand meter since the period 999999999 started It is reset to O at the start of each period Does not apply if a demand meter is not defined TOT_CON3 Total Total energy accumulated while Float pt PMI Consumption Tariff 3 was active as measured by Q tg at Tariff 3 the demand meter since the period 999999999 started It is reset to O at the start of each period Does not apply if a demand meter is not defined TOT_CON4 Total Total energy accumulated while Float pt PMI Consumption Tariff 4 was active as measured by Q to at Tariff 4 the demand meter since the period 999999999 started It
24. Refer to the Operator Workstation User s Manual for information on displaying Definition windows To define loads l Display the summary of the system containing the Load Group object to which you are adding Loads Select the Load Group object to display its Focus window Select the Associated Loads button on the Focus window to display the Associated Loads dialog box Select a priority level 1 to 4 Select the Add button to display the Load Definition window Enter values for the parameters Review the Load Definition Window section of this document for an explanation of each parameter 36 Demand Limiting and Load Rolling Technical Bulletin Load Group and Load Attribute Tables Table 9 lists and explains the Load Group attributes Table 10 explains Load attributes Table 8 defines the usage terms in the last column in both Table 9 and Table 10 Table 8 Terms Used in Reference Usage Term Description Definable Writable Object Default JC B Writable Triggerable Range Check GPL Menu PMI 1 String Boolean Integer Floating Point Means that you can set a value for the attribute using the Data Definition Language Graphic Programming Language or online Object Definition window You designate attribute values when defining the object Means you can modify the attribute using the Object Focus window or GPL Template A timesaving function used in JC BASIC programming Allows you to omit the attribute
25. TRGT2 DL_TRGT3 DL_TRGT4 EOI_DEF Continued on next page PMI Label Auto Dialout ASCII Representa tion Value Demand Limiting Amount to Shed Demand Limiting Demand Interval Sensitivity Amount Shed Demand Limiting Demand Limiting State DL Tariff 1 Target DL Tariff 2 Target DL Tariff 3 Target DL Tariff 4 Target End of Interval Defined Flag indicating whether or not Y or N critical reports Crit1 Crit4 force a dial up to a remote Operator Workstation The Total Shed value converted to ASCII text for PMI display at the workstation or Network Terminal NT Equals the current amount of energy turned off this minute by both DL and LR Specifies whether the Load Group is involved in DL If yes a demand meter must be defined The amount DL attempts to turn off this minute to maintain demand peak control The number of minutes over which the instantaneous demand is averaged Normally stipulated by local power company Allows you to more accurately time the Demand Limiting algorithm for moderate normal or aggressive shedding This attribute is applicable to the Sliding Window algorithm only The amount currently shed by DL Specifies whether DL feature is undefined monitoring only or shedding loads The level below which the operator wants to keep demand peaks when Tariff 1 is active The level below which the operator wants to keep demand peaks when Tariff
26. al alarm report Category that specifies whether the feature is Undefined Monitoring Only or actively Shedding loads Undefined the default indicates LR is not active When Monitoring Only no control actions occur When Shedding LR sheds loads to meet the currently active LR target Using the Definition window you can specify Undefined or Monitoring Only To specify Shedding use the LR_SHED command explained in Table 11 The amounts of energy that are to remain shed by the feature when the corresponding Target level is active If Tariff Level switching is not used you should define at least the Tariff 1 Target which is used by default The operator Schedule feature MC object or JC BASIC can change the LR targets For example the Schedule feature can change the target values when the facility is normally unoccupied Valid Entry Hourly Daily Weekly Monthly the default and Manual Y Disabled or N Enabled YorN None the default Crit1 Crit2 Crit3 Crit4 Follow up and Status None the default Crit1 Crit2 Crit3 Crit4 Follow up and Status 0 to 255 Undefined Default Monitoring Only or Shedding 0 to 999999 24 Demand Limiting and Load Rolling Technical Bulletin Load Group Focus Window Use the Focus window to view or modify the value of the parameters for Load Groups Figure 7 Boxes contain the fields you can edit described in Table 3 Most of the parameters in the Load
27. arameters on the Load Focus window Priority cannot be changed but you can change Load Locked with a command Load Focus ltem Edit View Action Go To Accessory Help 4p System Name AHU1 NETWORK MAP Object Name RFMSO Expanded ID Return Fan Multispeed ASSOCIATED LOADS Load Group System Name DEMAND Comfort Override Object Name Load1 System Name AHU1 Object Name SPACE Minimum Shed time LS minutes Priority 4 Load Locked N Minimum Release time L2__ minutes Maximum Shed time 30 minutes Load Status Shed Controlling Feature Demand Limiting Shed State 0 Load Rating State 1 Load Rating State 2 200 Load Rating State 3 Figure 11 Load Focus Window Table 6 Load Focus Window Boxes Box Name Description Valid Entries Load Status Box indicates whether this load has been Released or Shed Released or Shed Controlling Box indicates which DLLR feature if any is presently controlling None Demand Feature the load Limiting or Load Rolling Demand Limiting and Load Rolling Technical Bulletin 33 Dynamic Load Summary The Load Group Focus window shows a button labeled Load Summary When you select this button a load summary displays as shown in Figure 12 This summary is available in Metasys Release 11 00 and later 10g LOAD_GP1 Bel ES ltem Edt View Action GoTo Accessory Help June 30 2000 10 51 20 AM REL DL 100 R
28. ate and time of the largest Date time PMI Period current period peak demand while Measured Tariff 3 was active Peak Date of Tariff 3 C_PK_DT4 Current The date and time of the largest Date time PMI Period current period peak demand while Measured Tariff 4 was active Peak Date of Tariff 4 C_PPK_DT Current The date and time of the largest Date time PMI Period current period projected peak Projected demand while Tariff 1 was active Peak Date of Tariff 1 C_PP_DT2 Current The date and time of the largest Date time PMI Period current period projected peak Projected demand while Tariff 2 was active Peak Date of Tariff 2 C_PP_DT3 Current The date and time of the largest Date time PMI Period current period projected peak Projected demand while Tariff 3 was active Peak Date of Tariff 3 C_PP_DT4 Current The date and time of the largest Date time PMI Period current period projected peak Projected demand while Tariff 4 was active Peak Date of Tariff 4 CUR_LVL Current The current state of the Target Level Integer 1 Tariff 1 Target Level selector MSD MSI object 1 to4 Target 2 Tariff 2 Target 3 Tariff 3 Target 4 Tariff 4 Target CUR_PER Current The date and time the current period Date time PMI Period started Continued on next page Demand Limiting and Load Rolling Technical Bulletin 39 Attribute Cont Description S W Name DIAL_UP DISPLAY DL_ADDED DL_ATS DL_INTVL DL_SENSI DL_SHED DL_STATE DL_TARGT DL_
29. ate of Tariff 2 P_PP_DT3 Previous The date and time of the largest Period previous period projected peak Projected demand while Tariff 3 was active Peak Date of Tariff 3 P_PP_DT4 Previous The date and time of the largest Period previous period projected peak Projected demand while Tariff 4 was active Peak Date of Tariff 4 Continued on next page Code Default Value Type Range Float pt 0 to 999999 Float pt 0 to 999999 Date time Date time Date time Date time Date time Date time Date time Date time Usage PMI PMI PMI PMI PMI PMI PMI PMI PMI PMI 44 Demand Limiting and Load Rolling Technical Bulletin Attribute Cont Description Type S W Name PMI Label Range PREFIX Condition NT only Prefix indicating whether Boolean the Load Group object is trigger Oor 1 PTOTCONS Previous locked report locked disabled or in alarm The appears before the object name Code Default Value 0 No 1 Yes Usage PMI PMI The total energy used in the last Float pt PTOTCON2 Total Consumption at Tariff 1 Previous PMI The total energy used in the last Float pt PTOTCON3 Total Consumption at Tariff 2 Previous PMI The total energy used in the last Float pt PTOTCON4 Total Consumption at Tariff 3 Previous PMI The total energy used in the last Float pt REPORT Total Consumption at Tariff
30. calculations continue to be processed and energy profile information is updated When Shedding DL sheds loads to meet the currently active DL target On the Definition window you can specify Undefined or Monitor Only To specify Shedding use the DL_SHED command explained in Table 11 Continued on next page Valid Entry YorN YorN Normal Reliable Alarm Unreliable Normal Reliable Alarm Unreliable Normal Reliable Alarm Unreliable 0 to 999999999 0 to 999999999 0 to 999999 0 to 999999 0 to 999999 1to4 Undefined Default Monitor Only Shedding Box Name Cont Ramping Down the Current Target Demand Limiting Amount Shed Demand Limiting Amount to Shed Load Rolling Demand Limiting and Load Rolling Technical Bulletin 27 Description Valid Entry Box that applies only to the Sliding Window algorithm and only to a decrease in Current Target Prior to Metasys Release 11 00 after a decrease in the Current Target value an excessive amount of loads may be shed Metasys Release 11 00 and later implement a technique of ramping down to the new target if the Current Target is dropped This change minimizes the shedding reaction to the drop in Current Target Figure 8 shows the revised target level following a decrease in the target level from Told to Tnew Notice that the revised target level follows a decreasing staircase pattern In Figure 8 the number of readings N of electrical
31. consumption per demand interval is five The basic equation is divide the amount of Current Target drop by the demand interval The resultant value is the amount the Current Target decreases per minute until the new value is reached If a power fail occurs during the ramp period the latest Current Target value is used without a ramp up on power restoration The Load Group Focus window always shows the latest final Current Target not the ramp down values Ramping applies only when the target is decreased When the target is raised the new value takes effect immediately Revised i Target a Level Trey berse Told Target for Electric Consumption Thew Time Each step is one minute Target2 Figure 8 Revised Target Level Following a Decrease in Electric Consumption Note If the Current Target is lowered again before the ramp down to a previous charge has been completed the current value of Trey becomes Told the starting point of a new ramp down sequence The actual amount shed to meet the Demand Limiting Amount to 0 to 999999 Shed The amount of load the feature calculates it needs to turn off this 0 to 999999 minute to meet the currently active DL target Undefined Default Monitoring Only Shedding Box specifies whether the feature is Undefined Monitoring Only or actively Shedding loads When Monitoring Only no control actions occur When Shedding LR sheds loads to meet the currentl
32. control processes sending of COS reports to operator devices and acceptance of commands Lock Load removes a load from S O Name of consideration as a shed candidate If Object load is already shed the lock takes effect after the normal release cycle Lock Report stops the sending of COS reports to operator devices The current state of the locked attributes are saved to history and compared to their state later when the object feature is unlocked LOC_REP Lock Trigger prevents the triggering LOC_TRIG of any control processes This applies to all triggerable attributes The current state of triggerable attributes is not saved to history Load Rolling Monitor inhibits further load shedding by LR does not affect DL shedding All calculations are continued Previously shed loads are released as appropriate at Minimum or Maximum Shed Time LR_MON Continued on next page Communication Disable Operation DL Monitoring Only Operation DL Shedding Operation Set DL Target Value Communication Enable Operation Lock Load Communication Lock Report Communication Lock Trigger Operation LR Monitoring Only NA NA NA NA NA NA NA NA NA Feature NA Scheduling OWS Scheduling OWS Scheduling OWS MC JC B Writable NA Scheduling OWS Scheduling OWS Scheduling OWS Scheduling OWS Demand Limiting and Load Rolling Technical Bulletin
33. ct has been On less than the time specified in Minimum On Time e Comfort Override is enabled and the Comfort Override object is online and in warning or alarm e the load has been recently released from DLLR shedding and is still within the limit set by the Minimum Release time 3 If shedding all Priority 3 loads does not reach the target savings LR generates an Alarm priority report For example 50 kWH Cannot Be Shed By Load Rolling When loads are again available and shed LR generates a Normal priority report Load Group Load Rolling Normal 10 Demand Limiting and Load Rolling Technical Bulletin 4 LR compares the length of time that each load has been shed to the load s Minimum Shed time When the Minimum Shed time is reached and only then LR checks the status of the optional Comfort Override object if specified If the status reported is online enabled and in warning or alarm LR releases the load 5 LR then compares the length of time that each load has been shed to the load s Maximum Shed time When it reaches that time LR releases the load Note Ifthe load is on a different NC from the Load Group object and if there is a break in communication between the two NCs for example if the Load Group object NC goes offline then the load restores when it reaches its Maximum Shed time or the Minimum Shed time if the optional Comfort Override object is specified and in warning or alarm Special Condition Download
34. d interval lower than 95 percent of the user specified energy consumption target By means of the target elevation you can increase the hypothetical energy consumption target at the beginning of the interval which is then linearly reduced until it reaches 95 percent of the user specified energy consumption target in the middle of the interval The target elevation specifies the percentage by which the energy consumption target is increased at the beginning of the interval before going into the calculation of the Fixed Window algorithm This may result in the fact that the consumed energy surpassing 95 percent of the energy consumption target during the first half of the interval is saved in the second half of the interval by reducing energy consumption to values lower than 95 percent of the energy consumption target Load Rolling Process LR repeats the following process once each minute 1 LR sums the load ratings for all Priority 3 loads currently shed 2 IfLR shedding is below target LR selects and sheds available Priority 3 loads until it reaches the currently active target for Load Rolling Loads are shed in rotation The LR shed total includes Priority 3 loads shed by DL LR will not shed loads if e the load point object is locked e the load point object is offline disabled or in alarm e the load point object is in the shed state or below e the load point object is already controlled by a higher priority e the load point obje
35. e in the next demand interval If the Tariff Level MSD MSI becomes unreliable or goes offline the currently active target level remains active If not used Tariff Level System and Object Name fields should be left blank and both DL and LR use only their respective Tariff 1 Targets Some utility companies provide a tariff change signal which can be directly connected to the MSI used as the Tariff Level selector or connected via a process to the Tariff Level selector if additional logic is required Demand Limiting Indicator of whether the feature is Undefined or Monitor Only Undefined Undefined the Load Group Definition window default means DL is monitor only not active When Monitor Only DL performs no control actions but continues processing the calculations and updating energy profile information When Shedding DL sheds loads to meet the currently active DL target On the Definition window you can specify Undefined or Monitor Only To specify Shedding use the DL_SHED command explained in Table 11 of this document Demand Limiting The desired peak demand levels allowed for the Load Group If 0 to 999999 Tariff n Targets Tariff Level switching is not used define at least the Tariff 1 Target n 1 4 which is used by default The operator the Schedule feature an MC object or JC BASIC can command the DL Targets Scheduled changes of the targets can be useful for seasonal changes in overall demand Continued on next page
36. etl Af 1 At 1 3 Calculate the total uncontrolled energy E Ey Ut St 4 Calculate the projected total uncontrolled energy amounts Et 1 Et 2 Ettn E E 1 25A z where i 1 ton i Demand Limiting and Load Rolling Technical Bulletin 5 Calculate the projected shed values St 1 St 2 Sttn Siri Eso A 2 Ug where i 1 to n j 0 6 Determine the worst case projected shed value Smax Smax MAX St 1 S t 2 S ttn 7 The amount of energy to shed to meet the Demand Limiting Target this minute DLAtoS calculates from worst case projected amount to shed Smax what is already shed St and what will be released in next minute Ry 1 as follows Special Condition Download After a download the Demand Limiting shed status sets to Monitor Only regardless of the shed status prior to the download To enable shedding use the Demand Limiting Shedding DL_SHED command Special Condition Startup On startup of the DL feature DL becomes accurate when a Demand Interval elapses Before that time the energy calculation does not have the appropriate data for past Energy Slices DL startup occurs when e the NC undergoes a cold or warm start e adisabled Load Group is enabled e Load Group status changes from alarm to normal Demand Limiting and Load Rolling Technical Bulletin 9 Fixed Window Algorithm The Fixed Window algorithm is designed to keep the actual energy consumption during a fixe
37. f equipment that is turned off however you increase the probability of exceeding the target A high setting allows you to begin shedding sooner into the demand peak By using this setting you decrease the probability of exceeding the target however you increase the amount of equipment that is turned off A medium setting default allows you to start shedding slightly earlier than a low setting and later than a high setting By using this setting you turn off equipment earlier than you would when using a low setting but you don t have to turn off as much equipment at once as you would when using a high setting The following compares advantages and disadvantages of the different settings Setting Advantage Disadvantage Low You shed less load You increase the possibility of exceeding the target High You decrease the You shed more load probability of exceeding the target Medium You balance Low and You balance Low and Default High settings High settings Continued on next page Box Name Cont Demand Limiting Tracking Period Disabled Auto Dial out Flag Report Type Normal Report Type Alarm Alarm Message Load Rolling Load Rolling Tariff n Targets n 1 4 Demand Limiting and Load Rolling Technical Bulletin 23 Description Typically the billing period This parameter defines the time frame and the mode at which periods are reset The results of this function are displayed on the Load Grou
38. get Ramping see the Load Group Focus Window section in this document DL will not shed a load if e the load is locked e the load point object is disabled offline or in alarm e the load point object is in the shed state or below e the load point object is already controlled by a higher priority command e the load point object has been On less than the time specified in Minimum On Time e Comfort Override is enabled and the Comfort Override object is online and in warning or alarm e the load has been recently released from DLLR shedding and is still within the limit set by the Minimum Release time If shedding all available Priority 4 loads does not satisfy the load shedding goal DL selects and sheds available Priority 3 loads until the load shedding goal is reached If shedding all available Priority 3 loads does not satisfy the load shedding goal the process continues with Priority 2 loads and then Priority 1 loads Demand Limiting and Load Rolling Technical Bulletin 5 7 If shedding all available loads does not reach the target savings DL generates an Alarm priority report For example 50 kWH Cannot Be Shed By Demand Limiting When loads are again available and shed DL generates the following Normal priority report Load Group Demand Limiting Normal You can also manually turn off loads to avoid exceeding the demand limit Choose loads e that are not available or directly controllable by the DL feature e whose
39. he principle that some loads are not critical or even required under certain circumstances For example you might determine that e except during a specific high usage period a water heater can be shut off for a period of time if the water temperature is currently at least 105 F e an HVAC unit can normally be off 15 minutes before internal temperature changes become noticeable Days with extreme outside temperatures are an exception e decorative lighting during the day might not be worth the cost associated with peak energy charges Potential Load Candidates Based on the target information determine e Which loads can be considered for shedding e Is scheduling or some triggering process needed to limit the availability of the load as a shed candidate e What priority is appropriate for each load Note Each load can be associated with only one Load Group object Load Ratings Identify the rate of energy consumption for each load If the load is a multistate object then you must determine the energy consumption associated with each of its possible states In addition you can specify that the multistate load be switched to a state other than its Off state when it is shed Since the DLLR features shed loads to meet a specified target you must identify the savings expected when a particular load is shed For example if an On Off fan is rated at 10 kW or a multi speed fan is rated at 2 5 and 10 kW for its low medium and
40. ical Bulletin Notes Ifa load is restored but the kW consumption does not go up because now the load is off anyway for example per schedule the algorithm does not go on looking for another load to release If the load is on a different Network Controller NC from the Load Group object and if there is a break in communication between the two NCs if for example the Load Group object NC goes offline then the load stays in its shedded state and sends the report Load not released from Demand Limiting Control In this case the operator has to release the load from the Operator Workstation OWS or Operator Terminal OT manually or by a JC BASIC process DLLR Object Demand Limiting Equations Both Sliding Window and Fixed Window algorithms are specified in this technical bulletin The algorithms are based on keeping the demand over a demand interval below a user specified target The Fixed Window algorithm supports an optional user specified target profile The algorithm runs once a minute Figure 1 illustrates the input and calculated values relative to time A St 2 St St 2 Ut 2 Ut Ut 2 ene Energy Demand e Yt dt A t7 t6 t5 t4 t3 t2 t1 t t 1 t 2 t 3 Time in Minutes Et Ut St t is the present time Ut is the instantaneous demand at time t t 1 is 1 minute ago St is the amount shed at time t t 1 is 1 minute into the future Et is the total unc
41. imum Boolean Oor1 String 8 char maximum String 8 char maximum Code Default Value 0 Monitor only 1 Shedding 0 Not defined 1 Defined 0 Normal 2 Alarm 0 EOI is unreliable 1 EOI is OK Usage PMI PMI PMI Definable Range Check Definable Range Check Definable Range Check Definable Range Check Definable Definable Definable Definable 42 Demand Limiting and Load Rolling Technical Bulletin Attribute Cont Description S W Name NAME NOR_RPT OBJECT OFFLINE P_PD_PK P_PD_PK2 P_PD_PK3 P_PD_PK4 P_PD_PPK P_PD_PP2 Continued on next page PMI Label Expanded ID Normal Report Type Object Name Comm Status Previous Period Measured Peak at Tariff 1 Previous Period Measured Peak at Tariff 2 Previous Period Measured Peak at Tariff 3 Previous Period Measured Peak at Tariff 4 Previous Period Projected Peak at Tariff 1 Previous Period Projected Peak at Tariff 2 Optional expanded version of the object s name that helps to further identify the object For example EAST WING LOAD GROUP 1 for EWLOADY1 It appears in the Focus window GPL template and summaries The type of COS report generated when the status of the object changes to Normal Name of the object such as LOADGRP1 This name must be unique in the system Specifies whether the object is offline or online
42. ing Technical Bulletin 29 Load Definition Window The Load Definition window allows you to add loads to a Load Group Figure 10 The parameters that appear in the Load Definition window are described in Table 5 Note Each load can be associated with only one Load Group object Load Definition Item Edit View Action Go To Accessory System Name NETWORK MAP Object Name ASSOCIATED LOADS Load Group System Name DEMAND Comfort Override Object Name Load System Name Object Name In Minimum Shed time minutes Priority Load Locked Minimum Release time _____ minutes Maximum Shed time minutes Shed State Load Rating State 1 Load Rating State 2 Load Rating State 3 Figure 10 Load Definition Window 30 Demand Limiting and Load Rolling Technical Bulletin Table 5 Load Definition Window Boxes Box Name System Name Object Name Priority Load Locked Minimum Release time Maximum Shed time Shed State Load Rating State n n 1 3 Description The name of the system on which the load object exists The name of the load object The load point must be a BD BO MSD MSO or MC object If the associated Load Group defines the DL feature make sure that the load object s consumption is monitored by the Demand Meter defined for the group The priority 1 to 4 of the load to be shed
43. iting feature and the Load Rolling feature could shed at the present time if required Totals are shown for each feature The system object name of each load defined in the Load Group is the Item The priority that the operator has defined for the load The value ranges from 1 to 4 The Ick lock column tells whether the load is currently locked Y or unlocked N The stat status column tells whether the load is currently shed SHED or has been released REL from shedding The Ctrl feat Controlling feature is the feature that has most recently shed or released the load The Controlling feature is either Demand Limiting DL or Load Rolling LR The Load Rating is the energy usage of the load in one of up to three possible states The Min On also called Minimum Release time1 is the minimum number of minutes that the load remains released that is allowed to be On after it has been released The Max Off also called Maximum Shed time1 is the number of minutes that the load is allowed to be in the Shed Off state The state to which the load is shed if shedding is necessary For a two state load the shed state is 0 Off For a multiple state load the shed state is any state lower than the highest state For a load that is released this is the number of minutes remaining before the load is again made available for shedding For a load that is shed this is the number of minutes remaining before the load is released from
44. k Definable Triggerable GPL Menu PMI PMI PMI PMI PMI PMI Demand Limiting and Load Rolling Technical Bulletin 43 Attribute Cont Description S W Name PMI Label P_PD_PP3 Previous Largest projected demand interval Period peak detected in the last period Projected while Tariff 3 was active Does not Peak at apply if a demand meter is not Tariff 3 defined P_PD_PP4 Previous Largest projected demand interval Period peak detected in the last period Projected while Tariff 4 was active Does not Peak at apply if a demand meter is not Tariff 4 defined P_PK_DT Previous The date and time of the largest Period previous period peak demand while Measured Tariff 1 was active Peak Date of Tariff 1 P_PK_DT2 Previous The date and time of the largest Period previous period peak demand while Measured Tariff 2 was active Peak Date of Tariff 2 P_PK_DT3 Previous The date and time of the largest Period previous period peak demand while Measured Tariff 3 was active Peak Date of Tariff 3 P_PK_DT4 Previous The date and time of the largest Period previous period peak demand while Measured Tariff 4 was active Peak Date of Tariff 4 P_PPK_DT Previous The date and time of the largest Period previous period projected peak Projected demand while Tariff 1 was active Peak Date of Tariff 1 P_PP_DT2 Previous The date and time of the largest Period previous period projected peak Projected demand while Tariff 2 was active Peak D
45. ld be used if provided by the utility company The Demand Meter must e clearly reflect the actual demand profile For example the filter function should not be used e reside on the same NCM as the Load Group object e be an ACM object recommended an Al object or an AD object If the LR feature is defined without DL define a meter to display units for the LR This is the only way the LR feature uses the meter ACM object demand calculations can be synchronized with the DL calculation This timing ensures that the feature is using current demand data Al object or AD object demand calculations cannot be synchronized with the DL calculation Consequently the data used by DL could be up to one minute old used for two calculations or skipped altogether If the utility peak charges are based on the combined demand of several meters you should wire the meters together with a hardware totalizer preferred method An alternative is to define an AD object in the software which can reflect the totals for the input meters The DL results however are less accurate because of timing limitations The units used for the meter constant must be energy usage per pulse for example kWH pulse The higher the counts per minute the more accurate the results of Demand Limiting If the counts per minute are too low erratic shedding results To rectify the problem install a higher resolution meter End of Interval The name of the system on
46. m Current Period Measured Peak at Tariff 1 Current Period Measured Peak at Tariff 2 Current Period Measured Peak at Tariff 3 Current Period Measured Peak at Tariff 4 Current Period Projected Peak at Tariff 1 Current Period Projected Peak at Tariff 2 Current Period Projected Peak at Tariff 3 Description User defined reference number that identifies the particular text to be included with an alarm COS report in the Critical Alarm warning box Type of COS report that is generated when the status of the Load Group changes to alarm Largest demand interval peak detected since the start of the period while Tariff 1 was active Does not apply if a demand meter is not defined Largest demand interval peak detected since the start of the period while Tariff 2 was active Does not apply if a demand meter is not defined Largest demand interval peak detected since the start of the period while Tariff 3 was active Does not apply if a demand meter is not defined Largest demand interval peak detected since the start of the period while Tariff 4 was active Does not apply if a demand meter is not defined Largest projected demand interval peak detected since the start of the period while Tariff 1 was active Does not apply if a demand meter is not defined Largest projected demand interval peak detected since the start of the period while Tariff 2 was active Does not apply if a demand me
47. nstruction Instanta neous Demand Interval Demand Load Rolling used to input the utility company s end of demand interval pulse to the Load Group The Bl must reside on the same NCM as the Load Group object to which it belongs The results of alarm analysis on the BI object supplying the EOI pulse to the DL feature Specifies the name of the system containing the BI object used to input the utility company s end of demand interval pulse to the Load Group EOI_SYS must reside on the same NCM as the system containing the Load Group object Flag indicating whether the EOI input is unreliable Number of the graphic symbol used to represent the object in drawings A value of 0 means no graphic is displayed Number of the operating instruction used to explain the object A value of 0 means no instruction is displayed The rate of energy usage demand averaged over the last minute This is not the value monitored by the power company This rate fluctuates extensively in proportion to the meter constant As the meter constant increases the fluctuations increase proportionally The rate of energy usage averaged the demand over the Demand Interval This is the value measured by the power company Since the typical value of the Demand Interval is 15 this rate is much less sporadic than the Instantaneous Demand The largest Interval Demand is saved as the Current Period Peak Demand Specifies whether the L
48. oad Group is involved in LR Type Range String 8 char maximum Integer 0 to3 String 8 char maximum Boolean Oor1 Integer 0 to 32767 Integer 0 to 32767 Float pt 0 to 999999 Float pt 0 to 999999 Boolean Code Default Value 0 Normal 2 Alarm 0 EOI is unreliable 1 EOI is OK 0 None 0 None 0 LR not defined 1 LR defined Usage Definable Definable Definable Writable JC B Writable Range Check Definable Writable JC B Writable Range Check PMI PMI Definable Demand Limiting and Load Rolling Technical Bulletin 41 Attribute Cont Description S W Name PMI Label LR_ATS Amount to The amount LR attempts to turn off LR_SHED LR_STATE LR_TARGT LR_TRGT2 LR_TRGT3 LR_TRGT4 LVL_DEF LVL_OBJ LVL_STAT LVL_SYS LVL_UNR MTR_OBJ MTR_SYS Continued on next page Shed Load Rolling Amount to Shed Load Rolling Load Rolling State LR Tariff 1 Target LR Tariff 2 Target LR Tariff 3 Target LR Tariff 4 Target Tariff Level Defined Tariff Level Object Name Tariff Level Status Tariff Level System Name Tariff Level Unreliable Meter Object Name Meter System Name this minute to maintain demand peak control The amount currently shed by LR Specifies whether LR feature is undefined monitor only or shedding loads The level of power the o
49. ontrolled energy at time t timemin Figure 1 Input and Calculated Values Relative to Time Demand Limiting and Load Rolling Technical Bulletin 7 The following constants appear in the Sliding Window algorithm e K is the exponential smoothing constant K 0 01 e Z is the standardized normal deviate at 95 confidence Z 1 96 approximated to 2 e Nis user specified demand interval e DLT is user specified target The following inputs are used in the Sliding Window algorithm e Uf Ut 1 Ut 2 Ut N measured instantaneous demand at time relative to current time t e Sz is current amount shed e Et 1 Ft 2 Ef N is total uncontrolled energy at time relative to current time t e At 1 is smoothed absolute error last minute e R is the amount of energy to be restored in the next minute Note U and S are determined after handling Load Rolling algorithm Sliding Window Algorithm The sliding window algorithm also uses n user specified demand interval time as an additional constant The following calculations in the algorithm determine the amount of energy to shed this minute DLAtoS to meet the user specified target DLT 1 Calculate forecast error e If it is the first time running through the algorithm set the forecast error to zero If it is not the first time running through the algorithm use the following equation et Ut St Et_1 2 Calculate the new smoothed absolute error At K l
50. p Focus window s Current Period and Previous Period fields Refer to Figure 6 During a period DL keeps track of the total consumption of energy peak demand and projected peak for each Tariff Target level You can reset this information automatically or manually at the end of the Tracking Period When you select automatic reset you also specify the time frame for the reset Box that shuts down all operation of the Load Group Disabling the Load Group stops the following e meter reading e calculating the DL Amount to Shed and the LR Amount to Shed e load shedding e calculating the Current and Previous Period Totals e advisory issuing At the time the Load Group is Enabled N e The Demand History resets to the last measured value of demand prior to disabling or to the current target value whichever is less e Advisories are issued e Loads are shed if needed and if the Load Group Focus window Status parameter displays Shedding Parameter that specifies whether or not Y or N critical reports Crit1 to Crit4 force a dial up to a remote OWS Parameter that specifies the type of Change of State COS report generated when the status changes to normal reliable Parameter that specifies the type of COS report generated when the status changes to alarm unreliable A user defined reference number that identifies the particular text to be included with an alarm COS report The text displays in the dialog box of a critic
51. perator would like to keep off when Tariff 1 is active The level of power the operator would like to keep off when Tariff 2 is active The level of power the operator would like to keep off when Tariff 3 is active The level of power the operator would like to keep off when Tariff 4 is active The Tariff Level defined flag is set when the Tariff Level system and object names are defined Specifies the name of the MSD MSI object used to switch to the various DLLR Tariff Target levels defined for the Load Group The results of alarm analysis on the MSD MSI object used as the Tariff Level selector Specifies the name of the system containing the MSD MSI object used to switch to the various DLLR Tariff Target levels defined for the Load Group Flag indicating whether the Tariff Level selector is unreliable Specifies the name of the ACM object used as the Load Group s demand meter The ACM must reside on the same NCM as the Load Group object to which it belongs Specifies the name of the system containing the ACM object used as the Load Group s demand meter Must reside on the same NCM as the system containing the Load Group object Type Range Float pt 0 to 999999 Float pt 0 to 999999 Boolean Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Boolean Oor1 String 8 char maximum Integer 0to3 String 8 char max
52. power consumption is reflected in the Load Group s meter 8 DL compares the length of time that each load has been shed to the load s Minimum Shed time When the Minimum Shed time is reached and only then DL checks the status of the optional Comfort Override object if specified If the status reported is online enabled and in warning or alarm DL releases the load 9 Additional loads may be released as a result of the following procedure The Demand Limiting algorithm runs once per minute The resultant value will be either or The positive value is a shed situation while the negative value is a restore situation Metasys Release 11 00 and higher supports the Restore part of the algorithm which is able to restore loads before their Maximum Shed time has expired The shed algorithm starts with the lowest priority 1 4 with 4 being the lowest and 1 the highest and works its way to the highest looking for loads to shed The restore algorithm starts with the highest and works down the priority chain The restore algorithm looks for loads that have been shed longer than the Minimum Off Time and are the closest to the expiration of the Maximum Shed time For example if 20 kW are eligible to be restored but the only loads that have been shed are a load of 2 kW with 65 minutes before expiration and one of 19 kW with 66 minutes before expiration only the load of 2 kW will be restored 6 Demand Limiting and Load Rolling Techn
53. rget Tariff 3 target Tariff 4 Target Target Elevation 10 Demand Interval 15 minutes Sensitivity medium W Tracking Period monthly W dildgrpd Figure 4 Load Group Definition Window 18 Demand Limiting and Load Rolling Technical Bulletin Table 2 Load Group Definition Window Boxes Box Name Description Valid Entry System Name The name of the system you selected for which you are defining a 8 character Load Group maximum Object Name The object in the system The object cannot already exist under the 8 character given system name maximum Expanded ID An expanded version of the object name that more clearly identifies 24 character the object maximum Graphic Symbol A reference number identifying the graphic symbol used to 0 to 32767 represent the object in Operator Workstation graphic summaries A value of zero the default means no graphic is displayed Operating Instr A reference number identifying the text provided when Help is 0 to 32767 requested at the OWS A value of zero the default means no message is displayed Meter System The name of the system on which the input Demand Meter exists 8 character Name maximum Meter Object The name of the input Demand Meter object 8 character Name The Demand Meter is the only required input for the DL feature maximum End of Interval and Tariff Level inputs are optional but shou
54. roup2 Load Group Two Normal dlutil Figure 2 Utility Profile This section describes the procedure for defining the DLLR features You can define DLLR in two ways offline using DDL or online using the Load Group Definition window and the Load Definition window See the Password Technical Bulletin LIT 636111 for the password level required For DLLR syntax refer to the DDL Programmer s Manual Refer to the Operator Workstation User s Manual for information on displaying Definition and Focus windows Figure 3 outlines the general definition procedure 12 Demand Limiting and Load Rolling Technical Bulletin Design Considerations Gather Data on Demand Profile Utility Company Parameters Input Power Meter Targets Potential Load Candidates Load Ratings y Assign Shedding Priorities y Establish Shed Times y Define Load Groups y Define Loads definition Figure 3 DLLR Definition Procedure Design Considerations To define the DLLR features gather information about your facility including data about the following demand profile utility company parameters input power meter targets potential load candidates load ratings Demand Profile Create a demand profile for the facility that includes the type and amount of consumables typically used over a two week period If the utility offers multiple tariffs that change throughout the day then your
55. s unreliable or goes offline the Fixed Window algorithm continues to function using the value of the Demand Interval field for its Fixed Window Therefore enter the synchronizing pulse interval in the Demand Interval field when using the Fixed Window algorithm The EOI System and Object Name fields should be left blank if DL is to use the Sliding Window algorithm or if only the LR feature is defined for the group The name of the system on which the Tariff Level input exists 8 character maximum Continued on next page 20 Demand Limiting and Load Rolling Technical Bulletin Box Name Description Valid Entry Cont Tariff Level The name of the Tariff Level input object 8 character Object Name Both the DL and LR features support up to four target levels Some Maximum utility companies provide different tariffs throughout the day to reflect times of higher consumption for example rates are higher in the daytime when overall demand is higher The Tariff Level input can be set by operator command scheduling MC object or JC BASIC to switch to the various target levels defined for DL and LR The Tariff Level selector must be a Multistate Data MSD or Multistate Input MSI object The states of the MSD MSI select Tariff levels are State 0 Tariff 1 Target default if no Tariff Level object defined State 1 Tariff 2 Target State 2 Tariff 3 Target State 3 Tariff 4 Target Any change in target level becomes effectiv
56. s you decide if you should use scheduling or multiple demand targets in conjunction with DL Input Power Meter Determine which power meter to use Options are Accumulator ACM recommended Analog Input Al and Analog Data AD objects The ACM is recommended because DL synchronizes its reading of the ACM value with the ACM hardware read resulting in greater accuracy With the AI and AD this synchronization is not possible and therefore DL might use the last minute s data rather than the newest data The DL feature requires a power meter The LR feature does not require a power meter but can use it to determine units of energy When using a power meter e consider the meter constant when installing the meter Higher counts per minute result in greater accuracy e for DL group the loads according to the meter that monitors them To control peak demand the loads shed must be monitored through that meter Note Ifyou are using an ACM as the power meter note that the ACM pulse constant attribute is double edge triggered Check whether the utility company s reading is single or double edge triggered If it is single edge triggered when you define the ACM you must enter a pulse constant that is half of what you would normally enter 14 Demand Limiting and Load Rolling Technical Bulletin Targets Determine the utility saving goal and determine when each load is necessary to the facility and its occupants DLLR operates on t
57. saananiesahadenes genes 48 2003 Johnson Controls Inc www johnsoncontrols com Code No LIT 636106 Software Release 12 00 2 Demand Limiting and Load Rolling Technical Bulletin Demand Limiting and Load Rolling DLLR Introduction The Demand Limiting and Load Rolling DLLR features reduce utility expenses by selectively turning off shedding loads Loads are the physical equipment that DLLR turns off Demand Limiting DL shaves off demand peaks in the building s demand profile Load Rolling LR reduces the overall demand profile These features control loads that use consumables Examples of consumables are electrical power natural gas and steam To use DLLR you define a Load Group object then define the loads associated with the Load Group object For each Network Control Module NCM up to 4 Load Groups and 500 loads can be defined Each Load Group can have up to 500 loads total anywhere on the network These loads do not have to reside on the same NCM as the Load Group object Each load can be associated with only one Load Group assign a load to one Load Group object only Each Load Group supports up to four demand profiles each with its own peak demand target level and only one profile is active at any one time This allows the DLLR features to take into account multiple tariffs provided by some utility companies for example cheaper rates during the night A Multistate Data MSD object can be time scheduled
58. shedding See the Load Definition Window section for more information Network Failure Operation Metasys Release 11 00 and later respond differently from earlier versions to Load Group communication interruptions There are two types of communication interruptions e loss of input from the demand meter e NCM communications interruptions including download power failure and loss of N2 communication When the Load Group detects a communication interruption Metasys Release 11 00 retains the last reliable demand value Upon restoration of NCM communication Metasys Release 11 00 starts the algorithm from the point of the last known demand value or the Current Target value whichever is less Earlier versions did not consider the previous demand values when restarting the algorithm Demand Limiting and Load Rolling Technical Bulletin 35 Detailed Procedures Defining Load Groups Note Refer to the Operator Workstation User s Manual for information on displaying Definition windows Defining Loads To define load groups l Display the summary of the system to which you are adding the Load Group object Select the New option from the Item menu Select the DLLR Group option to display the Load Group Definition window Enter values for the parameters Review the Load Group Definition Window section of this document for an explanation of each parameter Note Each load can be associated with only one Load Group object
59. table JC B Writable Range Check Definable Demand Limiting and Load Rolling Technical Bulletin 47 Attribute Cont Description S W Name PMI Label MAX_OFF Maximum The longest time the load can Shed time remain off under the control of DL or LR When no Comfort Override object is defined or if the Comfort Override object is normal the load is shed for the Maximum Shed time The Maximum Shed time must be greater than or equal to both the Maximum Off Time and the load s Minimum Shed time OV_OBJCT Override The name of the object defined as Object the Comfort Override object This Name object s Status attribute is checked for Normal or Alarm to determine whether the load should be shed or remain shed OV_SYSTM Override The name of the system containing System the Comfort Override object Name RATE Load Rating The power saved when the load is State 1 switched Off from State 1 Uses the demand meter s units RATE_2 Load Rating The power saved when the load is State 2 switched Off from State 2 Uses the demand meter s units RATE_3 Load Rating The power saved when the load is State 3 switched Off from State 3 Uses the demand meter s units SHED_STA Shed State The state to which the object is switched when it is shed by the Demand Limiting Load Rolling feature Type Range Integer 1 to 255 Value String 8 char maximu m String 8 char maximu m Float pt 1 to 999999 Float pt 1 to
60. tate 0 Off For MSD MSO and MC objects you can specify the Shed State as any state lower than the object s highest state The load is considered eligible for shedding only if its current state is higher than its Shed State When shed the load savings are the difference between the load ratings for the current state and the Shed State When released the object is restored to the state it had before shedding The power saved when the load is shed from State n n 1 3 to State 0 off The units are the same as the Demand Meter s power units for example kW You must define this value on the Load Definition window You can modify it on the Load Focus window if the load is not currently in a shed or restore state If loads are being shed you must lock the load and release its load status before changing the Load Rating Continued on next page Valid Entries 8 character maximum 8 character maximum 1to4 N default or Y 1 to 255 minutes 1 to 255 minutes 0 to 2 1 to 999999 Box Name Cont Comfort Override System Name Comfort Override Object Name Minimum Shed time Demand Limiting and Load Rolling Technical Bulletin 31 Description The system in which the Comfort Override Object exists The name of an object assigned to the load to adjust the shed time The object may be any object that supports the Status parameter and issues a Normal Alarm Warning indicator Acceptable object types are binar
61. ter is not defined Largest projected demand interval peak detected since the start of the period while Tariff 3 was active Does not apply if a demand meter is not defined Type Range Integer 0 to 255 Integer 0 to6 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Float pt 0 to 999999 Code Default Value 0 None 0 No report 1 Critical 1 2 Critical 2 3 Critical 3 4 Critical 5 5 Follow up 6 Status Usage Definable Writable JC B Writable Range Check Definable Writable JC B Writable Range Check PMI PMI PMI PMI PMI PMI PMI 38 Demand Limiting and Load Rolling Technical Bulletin Attribute Cont Description Type Code Usage S W Name PMI Label Range Default Value C_PD_PP4 Current Largest projected demand interval Float pt PMI Period peak detected since the start ofthe 0 to Projected period while Tariff 4 was active 999999 Peak at Does not apply if a demand meter is Tariff 4 not defined C_PK_DT Current The date and time of the largest Date time PMI Period current period peak demand while Measured Tariff 1 was active Peak Date of Tariff 1 C_PK_DT2 Current The date and time of the largest Date time PMI Period current period peak demand while Measured Tariff 2 was active Peak Date of Tariff 2 C_PK_DT3 Current The d
62. x Load Definition Window Load Focus Window Dynamic Load Summary Description Allows you to define a new Load Group Displays data for a Load Group allows modification provides access to Associated Loads dialog box Displays list of currently defined loads for Load Group and provides access to Load Definition and Focus windows for adding and modifying loads Allows you to add a new load Allows you to modify a load Displays all of a Load Group s loads in a single convenient window Demand Limiting and Load Rolling Technical Bulletin 17 Load Group Definition Window Use the Load Group Definition window to define feature parameters such as the targets the input power meter DL interval and report type Figure 4 Table 2 describes the boxes in the Load Group Definition window Load Group Definition Item Edit View Action Go To ACcessory BLDG 1 DEMAND NETWORK MAP System Name DEMAND Disabled Object Name Expanded ID Graphic Symbol Operating Instr Flags Auto Dialout Meter System Name Report Type Object Name NORMAL End of Interval ALARM System Name Object Name Messages Tariff Level Alarm System Name Object Name Load Rolling undefined Tariff 1 Target Demand Limiting undefined Tariff 2 Target Tariff 1 Target Tariff 3 Target Tariff 2 Target Tariff 4 Ta
63. y active LR target On the Definition window you can specify Undefined or Monitoring Only To specify Shedding use the LR_SHED command explained in Table 11 Continued on next page 28 Demand Limiting and Load Rolling Technical Bulletin Box Name Cont Load Rolling Amount Shed Load Rolling Amount to Shed Description Valid Entry The actual amount of Priority 3 loads shed by DL and LR 0 to 999999 The amount of load LR needs to turn off this minute to meet the 0 to 999999 currently active LR target Associated Loads Dialog Box The Associated Loads dialog box allows you to add to or modify loads in the Load Group by giving access to the Load Definition and Focus windows Figure 9 The list box displays the loads at the selected priority level See Table 4 for a description of the buttons on the Associated Loads dialog box Associated Loads for Load Group EASTILOAD1 sys obj AHU1 EXFAN AHU1 CHWPMP AHU1 RFSST AHU1 CHRPMP AHU1 SFSST AHU2 EXFAN Priority Level 2 O4 DELETE l EXIT dlassoc Figure 9 Associated Loads Dialog Box Table 4 Associated Loads Box Buttons Button Display Modify Add Delete Exit Action Displays the Focus window for the load selected in the list box Displays a Definition window for adding a load to the selected priority level Deletes the load selected in the list box Exits the Associated Loads dialog box Demand Limiting and Load Roll
64. y input binary data analog input and analog data With this option the DLLR features check the status of the specified object at the Minimum Shed time If the object status is in alarm or warning the load is released immediately If the object status is normal the load is released at the Maximum Shed time The minimum amount of time a load is turned off and is used in conjunction with the Comfort Override Once a load is shed for the Minimum Shed time Comfort Override determines if the load is released or if it remains shed until the Maximum Shed time The Minimum Shed time parameter is used only when Comfort Override is defined for this load The status of the Comfort Override object is checked when Minimum Shed time is reached If the Comfort Override object goes into alarm or warning after the Minimum Shed time but before the Maximum Shed time the load remains shed until the Maximum Shed time is reached Valid Entries 8 character maximum 8 character maximum 1 to 255 minutes 32 Demand Limiting and Load Rolling Technical Bulletin Load Focus Window The Focus window is a method of viewing or modifying the value of the parameters for Loads Figure 11 Boxes contain the fields you can edit described in Table 6 Most of the parameters on the Load Focus window are the same as those on the Load Definition window except for Load Status and Controlling feature Note You cannot edit the Priority or Load Locked p

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