Issue
When viewing an optimiser point, the value for “Minutes to Next Switch” appears unusually large.
Product Line
Satchwell BAS & SigmaEnvironment
- Satchwell BAS
- Satchwell Sigma
Cause
The optimiser is unable to accurately calculate the time to the next switch due to one or more of the following reasons:
- The associated time schedule is in a “Manual” condition.
- The optimiser point is correctly cross-referenced to a time schedule, but that schedule is further cross-referenced to another point (e.g., a programmable point) via:
- Low Action (LA)
- High Action (HA)
- Holiday point that is not correctly configured as a holiday schedule.
This misconfiguration prevents the optimiser from determining the next switch time, resulting in a default large value.
Resolution
To resolve this issue, review and adjust the hierarchy of overrides and actions in the software. The goal is to ensure the optimiser can directly interpret the time schedule without unnecessary layers of overrides.
Recommended Configuration Examples
Example 1
Instead of:
Holiday > Overrides (e.g., Programmable Points) > Time Schedule > Optimiser > Plant Level
Use:
Holiday > Time Schedule > Optimiser > Overrides (e.g., Programmable Points) > Plant Level
Example 2
Instead of:
Overrides (e.g., Programmable Points) > HA or LA xref > Time Schedule > Optimiser > Plant Level
Use:
Time Schedule > Optimiser > Overrides (e.g., Programmable Points) > Plant Level
Additional Notes
- Ensure that holiday schedules are correctly defined as holiday points.
- Avoid placing overrides or programmable actions above the optimiser in the control hierarchy.
