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 the 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 coupled in series electrical connection between the AC power source and the electrical load for control of the power delivered to the electrical load; a wireless receiver for receiving wireless control signals from the occupancy sensors, the wireless control signals comprising 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 operatively coupled to the controllably conductive device and the wireless receiver for controlling the power delivered to the electrical load in response to the wireless control signals; and a memory coupled to the controller, the controller configured to store a unique identifier of each occupancy sensor in the memory; wherein the controller is configured to enable the delivery of power to the electrical load in response to receiving the occupied wireless control signal from at least one of the occupancy sensors, and cease the delivery of power to the electrical load in response to receiving vacant control signals from both of the occupancy sensors, the controller configured to mark the unique identifier of each occupancy sensor from which the controller receives the occupied wireless control signal as occupied and mark the unique identifier of each occupancy sensor from which the controller receives the vacant wireless control signal as vacant, the controller configured to cease the delivery of power to the electrical load when the unique identifiers for both of the occupancy sensors are marked as vacant.