OCCUPANCY SENSOR HAVING AUTOMATED HYSTERESIS ADJUSTMENT FOR OPEN-LOOP DAYLIGHTING OPERATION

摘要

A system and method provide fail-safe operation of a lighting system. A lighting level detector is used to obtain a baseline lighting level for a low-intensity light. If the detector measures less than the baseline level when an occupancy sensor determines the space is unoccupied, a high-intensity light is energized and an indication is provided to a user that the low-intensity light has failed. A method provides daylighting operation of a lighting system. An occupancy sensor can have Wi-Fi functionality to enable remote configuration of the sensor. A line voltage occupancy sensor can include an interface with low voltage devices. An occupancy sensor can include an integral interface to enable an external control system to override the sensor's normal logic under emergency conditions. An occupancy sensor can include an active temperature compensation feature. An occupancy sensor can also incorporate an automatically adjustable coverage area.

主权项

1. A sensor, comprising:
a housing; a light sensor located in the housing, the light sensor for detecting ambient light levels in the monitored space; a processor communicatively coupled to the light sensor; and a load control device communicatively coupled to the processor, the load control device coupled to a load for selectively energizing and de-energizing the load in response to signal received from the processor; wherein the processor is programmed to perform an open-loop daylighting calibration routine for calculating an amount of light contributed by the load and using the calculated amount of light to automatically adjust a sensed light level at which the load will be energized or de-energized.