Patent ID: 9277629
Filing Date: 2016-03-01
CPC Classification: H05B,Y02B

Claim Text:
1. A load control system for controlling the amount of power delivered from an AC power source to an electrical load provided in a space having a movable structure and a fixed surface, the load control system comprising: a load control device adapted to be coupled in series electrical connection between the AC power source and the electrical load for control of the amount of power delivered to the electrical load, the load control device operable to receive wireless control signals and to control the amount of power delivered to the electrical load in response to the wireless control signals; a first occupancy sensor adapted to be mounted to the movable structure, the first occupancy sensor operable to detect movement of the movable structure and to transmit a first occupied wireless control signal to the load control device in response to detecting the movement of the movable structure, the load control device operable to enable the delivery of power to the electrical load in response to receiving the first occupied wireless control signal; and a second occupancy sensor adapted to be mounted to the fixed surface, the second occupancy sensor operable to detect an occupancy condition in the space and to transmit a second occupied wireless control signal to the load control device in response to detecting the occupancy condition; wherein each of the occupancy sensors is operable to transmit a vacant wireless control signal to the load control device in response to detecting a vacancy condition in the space, the load control device operable to cease the delivery of power to the electrical load in response to receiving the vacant wireless control signals from both of the occupancy sensors; wherein each of the occupancy sensors is operable to transmit a third wireless control signal to the load control device in response to detecting a continued occupancy condition in the space, the load control device ceasing the delivery of power to the electrical load in response to determining that no wireless control signals have been received from one of the occupancy sensors for the length of a predetermined timeout period, and receiving a vacant control signal from the other occupancy sensor; wherein the load control device initializes a failsafe timer with the predetermined timeout period and restarts the failsafe timer in response to receiving the third wireless control signals from the occupancy sensors, the load control device operable to cease the delivery of power to the electrical load when the failsafe timer expires; and wherein the first occupied wireless control signal comprises an occupied-take-action command, the second occupied wireless control signal comprises an occupied-take-action command and the third wireless control signal comprises an occupied-no-action command.