CONFIGURATION - Settings: Dawn/Dusk
This page is used to select parameters for dawn/dusk calculations. Dawn/Dusk calculations can be performed for single events right from the Time page of a module setting. Dawn/Dusk calculations can also be done for a certain date range by automatically creating a series of events. This feature is available on the Series module settings page. This allows you to preprogram a module for up to one year to follow dusk without repeated programming for example.
For example: From January 1 to January 10 the module on-time is set to 5:25 pm, from January 11 to January 20 the on-time is set to 5:30 pm etc. The interface will then turn on the module at the specific time and date range.
Dawn/Dusk Series Computation Sets.
These parameters determine the range and accuracy of the dawn/dusk series calculation.
Start Month is the month the calculation begins, default is 1 (January). This value can be between 1 and 12. This parameter can also be changed temporarily in the Series page where the calculations are started.
No. Months is the number of months the calculations are to be carried out, default is 12 and therefore it will calculate the dawn/dusk times over a full year. The range of this value can be between 1 and 12. This parameter can also be changed temporarily in the Series page where the calculations are started.
Day Steps is the number of steps in days the dawn/dusk calculation will be performed. If this value is set to one, the dawn/dusk times will be calculated for every day of the year. Default value is 3. Maximum value is 30. Depending on your location, these default parameters may need to change. If you live close to the equator, the dawn/dusk times will not vary as much as if you live closer to the poles. This parameter really determines the resolution of the data for selecting module events. It does not set the selection criteria for events directly. See the help on Series for an example.
Dawn/Dusk Event Selection Sets.
These parameters determine which dawn/dusk times will be selected to create a series of module events.
Minute Steps is the time in minutes that determines the selection criteria of events. If dawn time or dusk time do not change by more than the selected Minute Step between two dates, then the next calculated date will be checked if it matches the criteria. Default value of 10 minutes appears to create about 40 events over a one year period if you live at the 41st parallel. You can therefore preprogram an outside lamp for a full year to follow dawn/dusk in you area. Be aware that only a maximum of 113 timer events can be programmed into the CM11A, provided you have only one module. If you program other modules, then the number of dawn/dusk events will have to be reduced accordingly. You can either increase the value of Minute Steps or, preferably, shorten the date range.
Dawn Offset is used to compensate the calculated dawn (sunrise) time. Civil dawn time is calculated, which is defined as the point when the sun is at the location of 6 degrees before astronomical sunrise occurs. Depending on weather you live behind a mountain or in a flat area, you can use this offset to adjust the actual time when artificial lighting is required. The range is 0 to ñ30 minutes. If the offset is negative, then the amount selected will be subtracted from the rise time, thus activating a module earlier than sunrise. If the offset is positive, then the module is activated later than the actual sunrise. This offset is used for both, the single event sunrise calculation and the series event sunrise calculations. Default offset is zero.
Dusk Offset is used to compensate the calculated dusk (sunset) time. Civil dusk time is calculated, which is defined as the point when the sun is at the location of 6 degrees after astronomical sunset occurred. Depending on weather you live behind a mountain or in a flat area, you can use this offset to adjust the actual time when artificial lighting is required. The range is 0 to ñ30 minutes. If the offset is negative, then the amount selected will be subtracted from the sunset time, thus activating a module earlier than sunset. If the offset is positive, then the module is activated later than the actual sunset. This offset is used for both, the single event sunrise calculation and the series event sunrise calculations. Default offset is zero.
The DEFAULT button is used to restore all parameters displayed on this page to the default values.
To save these parameters, press the SAVE button. The CLOSE button and close window selection on the system menu will only change the parameters for the duration of the current HOUSE/290 session.