How Load Rolling Works - Metasys - LIT-12011288 - Software Application - Metasys Building Automation System - 6

DLLR Technical Bulletin

Product
Building Automation Systems > Building Automation Systems > Metasys Building Automation System
Document type
Technical Bulletin
Document number
LIT-12011288
Version
6
Revision date
2013-10-15

Load Rolling executes the following process once each minute:

  1. LR sums the load ratings for all loads currently shed for load rolling.

  2. If LR shedding is below the tariff target, LR selects and sheds available priority 10 loads until it reaches the currently active target for Load Rolling. Loads are shed in rotation.

  3. If shedding all priority 10 loads does not reach the target savings, LR selects and sheds all available priority 9 loads until the load shedding goal is reached.

  4. If shedding all available priority 9 loads does not satisfy the load shedding goal, the process continues with priority 8 loads, and so forth, until finally the priority 1 loads are shed.

    Note: All loads within a load priority must be either shed or ineligible to be shed before LR sheds a load from the next highest priority. For example, if a load is configured at priority 10, it might be shed many times before a priority 9 or higher load is shed even once. Also, before a priority 8 load is shed, all priority 9 and priority 10 loads already must be shed (or be ineligible to be shed).
  5. If shedding all available LR loads still does not reach the target savings, the following occur:

    • The Status Indicator on the DLLR Focus view displays Trouble. (If in Monitor Only mode, DLLR instead indicates its status as Monitor Only Mode Active.)

    • The DLLR Status attribute in the DLLR Focus view reads LR cannot meet target.

    • The LR not Shed attribute under the Advanced Load Rolling section of the DLLR object UI indicates the unsheddable value.