Method and apparatus for monitoring electrical devices

Details Method and apparatus for monitoring electrical devices Method and apparatus for monitoring electrical devices

1991-04-26

1993-09-28

Swarthout, Brent A.

Communications: electrical

Traffic control indicator

Traffic control or local controller failure indicator

315130, 340642, 340661, 361110, 364483, G08G 1097

Patent

active

052489671

ABSTRACT:
The condition of signal lamps (R1, R2) in a traffic light system is monitored by compiling a table of power consumption levels at different levels of applied voltage. The table is then used to adjust measured levels of power consumption at intervals during the service life of the traffic light system. A fault condition is signalled if the adjusted values differ by more than a predetermined amount.

REFERENCES:
patent: 4208692 (1980-06-01), Rohr
patent: 4291302 (1981-09-01), King et al.
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4633418 (1986-12-01), Bishop
patent: 4792701 (1988-12-01), Olon et al.
patent: 4811010 (1989-03-01), Lucas
patent: 4979122 (1990-12-01), Davis et al.
patent: 5005008 (1991-04-01), King
patent: 5144282 (1992-09-01), Sutterlin et al.

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