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.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
22 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of preventing cycling in high pressure sodium lamps, the method comprising:
-
detecting a lamp off condition; interrupting power to the lamp for a defined period of time to enable the lamp to cool-down; providing power to the lamp after the defined period of time; determining if the lamp was restarted subsequent to the providing power; and disabling the lamp if the lamp fails to restart. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A method of controlling operation of a high pressure sodium lamp, the method comprising:
-
detecting a night condition; initiating a lamp on sequence subsequent to the detection of the night condition; detecting a lamp off condition; interrupting power to the lamp for a defined period of time to enable the lamp to cool-down; initiating a lamp on sequence after the defined period of time; determining if the lamp was turned on in response to the lamp on sequence; tracking failed turn on of the lamp; and disabling the lamp if the failed turn on tracking exceeds a defined threshold. - View Dependent Claims (18, 19, 20, 21, 22)
-
Specification