Modifying Light Levels For Daylight Sensors - Eaton WaveLinx User And Programming Manual

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WaveLinx User Manual
Step 4: Next, tap on the trash can icon in the desire occupancy set row, then confirm the deletion. The occupancy set will be removed.

Modifying Light Levels for Daylight Sensors

The WaveLinx system supports daylight sensor control for both interior and exterior applications. In both scenario, the daylighting
functionality may be disabled for fixtures that are not located in a daylight zone or for any devices where daylight operation is not desired.
The WaveLinx system supports two different daylighting approaches, closed loop and open loop.
Closed Loop Daylighting
Standard ambient, industrial and outdoor integrated sensors as well as tilemount sensors are used for closed loop daylight control. With the
closed loop approach, the sensor controls the fixture it is directly connected to. A closed loop sensor "looks" at the surface directly below
the sensor. It reads the reflected light level from the surface including light contributed by the electric light and the daylight that falls within
the sensor's view. As daylight contribution increases, the sensor dims the electric light to keep the light level on the surface as consistent as
possible. If bright daylight causes the surface light level to be above the desired level even after the light level has been fully dimmed, after a
period of time the fixture will dim to OFF . As daylight contribution decreases and the surface light level lowers, the fixture will turn back ON
and then raise the amount of electric light accordingly.
Open Loop Daylighting
The WaveLinx battery operated ceiling sensors are used for open loop daylight control in interior spaces. The WaveLinx Wireless Outdoor
Lighting Control Module is used for open loop daylight control in exterior spaces. With open loop daylight control, the sensor is placed
in a spot that is optimal for sensing daylight contribution while minimizing the sensor's view of the electric light in the controlled area. A
correlation is then made between the daylight level "seen" by the sensor and the desired electric light level output, adjusting how much
the sensor dims the electric light in response to daylight. The sensor adjusts the electric lighting as daylight contribution increases and
decreases.
Because the sensor reading is "looking" at daylight contribution and is not affected by changes in the electric light, the sensor can control
multiple zones of fixtures. In interior applications, one sensor can even control different zones at different light levels. This is a common
approach for primary daylight zones next to the windows which typically dim more aggressively than secondary daylight zones located
further into the space. Sensor placement is critical with the open loop approach. Assigning a zone to an open loop daylight set will
automatically disable closed loop daylighting for any integrated sensors or tilemount sensors connected to loads in that zone.
Control Interactions with Daylighting
Daylighting filters the fixture's response to other control commands. A command from a wallstation button or occupancy sensor to go to
100% will adjust the electric light level output to meet the calibrated daylight level. A command from a wallstation button or occupancy
sensor to go to 50% will adjust the electric light level to meet 50% of the calibrated daylight level. The actual electric light level output with
these commands will vary based on the available amount of daylight in the space and how much electric light needs to be contributed to
maintain the commanded target. If the electric light has daylight dimmed to OFF , lighting will remain OFF if wallstation, schedule event or
occupancy commands are received, preventing unnecessary energy waste when adequate daylight is present.
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