摘要:
A wireless sensor for a load control system is adapted to be releasably mounted to a surface, such as a drop ceiling panel, to allow the optimum location of the sensor to be determined. A releasable mounting means of the sensor comprises two posts extending perpendicularly from a rear surface of the sensor. Each post has a small diameter and is rigid enough to pierce the panel without creating a large aesthetically-displeasing hole. The sensor may be permanently affixed to the panel by bending the posts at a rear surface of the panel without the use of a tool, such that the panel is captured between the mounting plate and the deformed posts. The sensor further comprises multiple test buttons provided on an outwardly-facing surface of the sensor for separately testing the communications of the load control system and the operation of the sensor. Alternatively, the releasable mounting means may comprise one or more magnets for magnetically coupling the sensor to a grid structure of the ceiling.
摘要:
An electronic dimming ballast has a parallel loaded resonant output circuit plus a combination of pulse width modulation and frequency variation to accomplish the dimming of compact fluorescent lamps. The ballast operates at a fixed frequency throughout a selected range of light levels, with dimming control being done completely by duty cycle variation over this range of operation, and then smoothly moves to a variable frequency as the light output moves outside the selected range, with both duty cycle and frequency variation being the means of lamp light output control outside the selected range.
摘要:
A load control system for a building having a lighting load, a window, and a heating and cooling system comprises a lighting control device for controlling the amount of power delivered to the lighting load, a motorized window treatment comprising a window treatment fabric for covering the window, a temperature control device for controlling a setpoint temperature of the heating and cooling system to thus control a present temperature in the building, and a dynamic keypad comprising a visual display and operable to receive a user input. The dynamic keypad allows a user to select, adjust, and monitor a plurality of energy-savings modes of the load control system. For example, the dynamic keypad allows the user to enable and adjust a setback temperature of the temperature control device on-the-fly.
摘要:
A tensioned roller shade system for installation in an opening, such as a window or a skylight, comprises a frame, a roller tube rotatably mounted between side channels of the frame adjacent a first end of the frame, a conical, grooved spool mounted adjacent the roller tube, and a shade fabric is windingly received around the roller tube. A tensioning cord is operatively coupled between the spool and a fabric end of the shade fabric. The spool has a single groove, which wraps around the spool and windingly receives about the tensioning cord. A pulley is operatively coupled to the frame adjacent a second frame end and windingly receives the tensioning cord. The tensioning cord is adapted to bias the second fabric end toward the second frame end, such that the second fabric end of the shade fabric is adapted to move between the first and second frame ends as the roller tube is rotated.