System for testing NAC operability using backup power
First Claim
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1. A method for determining whether a notification appliance circuit has sufficient voltage to operate when powered by backup power, the method comprising:
- determining impedance of the notification appliance circuit;
determining, based on the impedance, a voltage drop across at least a part of the notification appliance circuit when powered by the backup power; and
determining, using a controller, whether, when powered by the backup power, there will be sufficient voltage to operate the notification appliance circuit based on the voltage drop,wherein the notification appliance circuit comprises at least one constant power notification appliance.
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Abstract
A monitoring system for a NAC (Notification Appliance Circuit) is provided. The monitoring system includes a system controller, and a NAC comprised of notification appliances that may be in a series. The NAC and its appliances may be operatively coupled to the system controller. The system controller is operable to determine whether a notification appliance has sufficient voltage at a low voltage operation.
12 Citations
27 Claims
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1. A method for determining whether a notification appliance circuit has sufficient voltage to operate when powered by backup power, the method comprising:
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determining impedance of the notification appliance circuit; determining, based on the impedance, a voltage drop across at least a part of the notification appliance circuit when powered by the backup power; and determining, using a controller, whether, when powered by the backup power, there will be sufficient voltage to operate the notification appliance circuit based on the voltage drop, wherein the notification appliance circuit comprises at least one constant power notification appliance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for determining whether a notification appliance circuit has sufficient voltage to operate when powered by backup power, the method comprising:
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determining impedance of the notification appliance circuit, wherein the notification appliance circuit comprises at least one constant power notification appliance; determining, based on the impedance, a voltage drop across at least a part of the notification appliance circuit when powered by the backup power; and determining, using a controller, whether, when powered by the backup power, there will be sufficient voltage to operate the notification appliance circuit based on the voltage drop, wherein the notification appliance circuit comprises a plurality of NAC appliances in a series; and wherein determining whether there is sufficient voltage to operate the notification appliance circuit comprises; determining, based on the approximated voltage drop, a resulting voltage at an end of the series of NAC appliances; and comparing the resulting voltage with a minimum operating voltage at which the NAC appliance is operable.
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18. A notification appliance circuit monitoring system for monitoring a notification appliance circuit in an alarm notification system the system comprising:
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a controller, the controller being operatively coupled to the notification appliance circuit, wherein the notification appliance circuit comprises at least one constant power notification appliance; and at least one sensor configured to sense at least one electrical parameter of the notification appliance circuit, the at least one sensor in communication with the controller, wherein the controller is operable to; determine, based on the sensed electrical parameter, impedance of the notification appliance circuit; determine, based on the impedance, a voltage drop across at least a part of the notification appliance circuit; and determine whether, when powered by the backup power, the notification appliance circuit will have sufficient voltage to operate based on the voltage drop. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification