RADIO-FREQUENCY LIGHTING CONTROL SYSTEM WITH OCCUPANCY SENSING

摘要

A load control system controls an electrical load provided in a space and comprises a load control device and one or more occupancy sensors. The load control device controls the load in response to the wireless control signals received from the occupancy sensors. Each occupancy sensor transmits an occupied control signal to the load control device in response to detecting an occupancy condition in the space and a vacant control signal to the load control device in response to detecting a vacancy condition. The load control device turns on the load in response to receiving the occupied control signal from at least one of the occupancy sensors, and turns off the load in response to receiving vacant control signals from both of the occupancy sensors. The load control device is operable to determine that no wireless control signals have been received from the occupancy sensors for the length of a predetermined timeout period and to subsequently turn off the load.

主权项

1. A load control device for controlling power delivered from an AC power source to an electrical load provided in a space having at least two occupancy sensors, the load control device comprising:
a controllably conductive device adapted to be electrically coupled in series between the AC power source and the electrical load to control the power delivered to the electrical load; a wireless receiver configured to receive wireless control signals from the occupancy sensors, each of the wireless control signals received from the occupancy sensors comprising one of an occupied wireless control signal indicating an occupancy condition in the space and a vacant wireless control signal indicating a vacancy condition in the space; a controller configured to control the controllably conductive device to control the power delivered to the electrical load in response to the wireless control signals received by the wireless receiver; and a memory configured to store unique identifiers of each of the occupancy sensors, the controller configured to mark as occupied in the memory the unique identifiers of the occupancy sensors from which occupied wireless control signals are received and to mark as vacant in the memory the unique identifiers of the occupancy sensors from which vacant wireless control signals are received; wherein the controller is configured to enable the delivery of power to the electrical load when the unique identifier for at least one of the occupancy sensors is marked as occupied and cease the delivery of power to the electrical load when the unique identifiers of all of the occupancy sensors are marked as vacant.