Echelon Lumewave CRD 3000 Street Light Bridge - Manual (Page 88)

78 Controlling a Street Lighting Network
Scheduling Overview
The Segment Controller contains an Event Scheduler application that you can
use to schedule data point updates (called events) to occur at specified times,
such as sunrise and sundown, or at a configured amount of time before or after.
For example, you can schedule luminaires to turn on at sundown, dim at the end
of the evening rush hour, brighten again at the start of the morning rush hour,
and then turn off at sunrise.
Each Event Scheduler includes daily schedules and exception schedules. To
create a daily schedule, you specify the days for which the schedule occurs (for
example, Monday–Friday or Saturday–Sunday) and then create the events to be
executed by the schedule. To create an exception schedule, you select a date or
range of dates for which an exception occurs and then specify how frequently the
exception recurs, such as every weekday or weekend day.
The events that you create in the daily and exception schedules change the state
and values of the luminaires on the network. In the daily schedule, you create
events that turn on, brighten, and dim the streetlights based on the times at
which the morning and evening rush hours start and end. You also create events
that turn on and turn off the lamp based on the sunrise and sundown times.
You can create a single Event Scheduler that handles multiple street lighting
network scenarios. For example, you could create an Event Scheduler that turns
the luminaires on at sundown while the evening rush hour is ongoing, and then
dims them at the end of the evening rush hour. If the evening rush hour ends
before sundown, the same Event Scheduler can just turn on the lights in the
dimmed state at sundown. Or if sundown occurs before the start of rush hour, it
can turn on the lights in the dimmed state at sundown, brighten them at the
beginning of the evening rush hour, and dim them back at the end of the evening
rush hour.
Before you can schedule events based on sunrise and sundown, you need to
configure the Real-Time Clock on the Segment Controller. The Real-Time Cock
maintains the current date and time on the Segment Controller. It also includes
an astronomical position sensor application that takes the time stored on the
Segment Controller and its location (geographic coordinates), and determines the
position of the sun (elevation and azimuth) relative to the Segment Controller,
calculates the sunrise and sundown times based on the position of the sun, and
then passes the calculated sunrise and sundown times to the Event Scheduler.
Tip: You can use a data logger to verify that your Event Scheduler is updating
the data points at the appropriate times. For more information on using the
Data Logger and using the Scheduler application, for both street lighting and
other network applications, see the i.LON SmartServer User’s Guide.
To create a schedule for a street lighting network, perform the following general
steps:
1. Configure the Real-Time Clock on the Segment Controller. See
Configuring the Real-Time Clock on page 79.
2. Create an Event Scheduler. See Creating Event Schedulers on page 84.
3. Add data point preset values. See Adding Data Point Preset Values on
page 88.