Anti-cycling control system for luminaires
First Claim
1. A method of controlling operation of a luminaire that includes a high pressure sodium lamp comprising:
- monitoring the on-off condition of the lamp;
upon detection of a lamp off condition, performing a delayed lamp restart procedure by interrupting power to the lamp during a cool-down period, restoring power to the lamp after the cool-down period and checking the on-off condition of the lamp to determine whether the lamp has restarted; and
disabling the lamp if the lamp fails to restart after the performing of the delayed lamp restart procedure.
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Abstract
An anti-cycling luminaire control system may detect repeated lamp-off conditions and interrupt power to the lamp and provide an indication of lamp cycling after a predetermined number of lamp-off conditions has been detected. The control system also provides a cool-off period after a lamp-off cycling event is detected during which time restarting of the lamp is inhibited. If the lamp does not restart after multiple restart attempts and cool-off periods, the system determines that a fault condition exists, and may provide a fault alert. The system may provide for shut-off or dimming of the lamp during the night after a portion of the night has passed. This delayed turn-off may be varied according to the length of the night. Starting and dimming the lamp at a zero voltage crossing of the line current can reduce stress on luminaire and control system components and reduce maintenance.
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Citations
18 Claims
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1. A method of controlling operation of a luminaire that includes a high pressure sodium lamp comprising:
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monitoring the on-off condition of the lamp;
upon detection of a lamp off condition, performing a delayed lamp restart procedure by interrupting power to the lamp during a cool-down period, restoring power to the lamp after the cool-down period and checking the on-off condition of the lamp to determine whether the lamp has restarted; and
disabling the lamp if the lamp fails to restart after the performing of the delayed lamp restart procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A luminaire control system for use with a luminaire having an alternating line current power source comprising:
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a photosensor system for detecting and outputting signal representative of day and night conditions;
a lamp sensor system for detecting and outputting signals representative of lamp on and off conditions;
a power control system for providing and interrupting power to a lamp in response to power control signals;
a microcontroller system for receiving the signals from the photosensor system and the a lamp sensor and for outputting power control signals to the power control systems, the microcontroller being programmed to respond to signals from the lamp sensor system indicating a lamp off condition and, in response thereto, to interrupt power to the lamp, and to apply power to restart the lamp only after the expiration of a predefined period of time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification