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US 10,832,557 B2Granted
Operating a fire alarm system
AssigneeHoneywell International Inc.
InventorMichael Barson
Life of this patent
Estimating the term…
Abstract
Devices, systems, and methods for operating a fire alarm system are described herein. One device includes circuitry to determine a resistance associated with an addressable fire alarm loop during a quiescent condition, determine an expected voltage drop in the loop during an alarm condition based on a plurality of devices of the loop, and set an alarm drive voltage of a power supply associated with the loop based on the resistance and the expected voltage drop.
Claims19
A controller for operating a fire alarm system comprising circuitry to:
- determine a resistance associated with an addressable fire alarm loop during a quiescent condition based on:
- a resistance of wiring associated with the loop
- a respective resistance of each of a plurality of circuit breakers corresponding to a plurality of devices of the loop;
- and
- a respective resistance of each of a plurality of portions of the loop located between devices of the plurality of devices;
- determine an expected voltage drop in the loop during an alarm condition based on the plurality of devices of the loop;
- and
- set an alarm drive voltage of a power supply associated with the loop based on the resistance and the expected voltage drop.
5 more elements
A fire alarm system, comprising:
- a plurality of devices of a loop of the fire alarm system, wherein the plurality of devices includes a plurality of alarm devices;
- a power supply associated with the loop;
- a controller associated with the loop and having circuitry to:
- determine a resistance associated with the loop during a quiescent condition based on:
- a resistance of wiring associated with the loop
- a respective resistance of each of a plurality of circuit breakers corresponding to the plurality of devices;
- and
- a respective resistance of each of a plurality of portions of the loop located between devices of the plurality of devices;
- determine an expected voltage drop in the loop during an alarm condition based on the plurality of devices;
- and
- set an alarm drive voltage of the power supply based on the resistance and the expected voltage drop.
8 more elements
A method of operating a fire alarm system, comprising:
- determining a resistance associated with an addressable fire alarm loop during a quiescent condition based on:
- a resistance of wiring associated with the loop
- a respective resistance of each of a plurality of circuit breakers corresponding to a plurality of devices of the loop;
- and
- a respective resistance of each of a plurality of portions of the loop located between devices of the plurality of devices;
- determining an expected voltage drop in the loop during an alarm condition based on the plurality of devices of the loop;
- setting a first alarm drive voltage of a power supply associated with the loop based on the resistance and the expected voltage drop;
- determining a maintenance condition associated with the loop;
- and
- setting a second alarm drive voltage of the power supply based on the determined maintenance condition.
7 more elements
Dependencies are inferred from the claim text.