Fire alarm system
AssigneeMitsubishi Electric Corporation
InventorKoki Kitazawa
Life of this patent
Estimating the term…
Abstract
Pulse voltage is applied to an alarm device a plurality of times consecutively, the pulse voltage having such a short time length that the alarm device does not issue a noticeable alarm. Power consumption for each of the pulse voltages is measured. Any of an average value of the plurality of power consumptions, a maximum value of the plurality of power consumptions, or a minimum value of the plurality of power consumptions, is calculated as a statistical value. When a difference between the statistical value and a predetermined reference value is greater than a predetermined threshold, it is determined that failure has occurred.
Claims7
A fire alarm system comprising:
- an alarm device for issuing an alarm;
- and
- an alarm controller for applying voltage to the alarm device, wherein
- the alarm controller
- applies pulse voltage to the alarm device a plurality of times consecutively, the pulse voltage having such a short time length that the alarm device does not issue a noticeable alarm,
- measures power consumption for each of the pulse voltages,
- calculates, as a statistical value, any of an average value of the plurality of power consumptions, a maximum value of the plurality of power consumptions, or a minimum value of the plurality of power consumptions, and
- when a difference between the statistical value and a predetermined reference value is greater than a predetermined threshold, determines that failure has occurred.
Dependencies are inferred from the claim text.