Fire panel end of line supervision monitoring
AssigneeTyco Fire & Security GmbH
InventorsAdam Elijah Siegel, Daniel Paul Cianfrocco
Life of this patent
Estimating the term…
Abstract
A fault sensing circuit is provided in a remote device configured to be connected to an end of line resistor (EOLR) that is used to detect wiring faults. The fault sensing circuit includes a current monitoring subcircuit configured to detect when an input current of the remote device has crossed a fault threshold corresponding to a fault in the remote device. The fault sensing circuit further includes a switching subcircuit connected to the current monitoring subcircuit and the EOLR. The switching subcircuit is configured to electrically connect a fault resistor in parallel with the EOLR to change a value of an end of line resistance for a fault indication when the input current of the remote devices has crossed the fault threshold.
Claims20
A fault sensing circuit in a remote device configured to be connected to an end of line resistor (EOLR) that is used to detect wiring faults, the fault sensing circuit comprising:
- a current monitoring subcircuit configured to detect when an input current of the remote device has crossed a fault threshold corresponding to a fault in the remote device;
- and
- a switching subcircuit connected to the current monitoring subcircuit and the EOLR, the switching subcircuit configured to electrically connect a fault resistor in parallel with the EOLR to change a value of an end of line resistance for a fault indication when the input current of the remote devices has crossed the fault threshold.
A fire detection system using an end of line resistor (EOLR) to detect wiring faults, comprising:
- a fire alarm control panel;
- and
- a plurality of remote devices operating in parallel, each comprising a fault sensing circuit that includes:
- a current monitoring subcircuit configured to detect when an input current of a remote device in which the fault sensing circuit is installed has crossed a fault threshold corresponding to a fault in the remote device;
- and
- a switching subcircuit connected to the current monitoring subcircuit and the EOLR, the switching subcircuit configured to electrically connect a fault resistor in parallel with the EOLR to change a value of an end of line resistance for a fault indication when the input current of the remote devices has crossed the fault threshold.
A method for fault sensing by a fault sensing circuit in a remote device, the remote device configured to be connected to an end of line resistor (EOLR) that is used to detect wiring faults, the method comprising:
- detecting, by a current monitoring subcircuit, when an input current of the remote device has crossed a fault threshold corresponding to a fault in the remote device;
- and
- electrically connecting, by a switching subcircuit connected to the current monitoring subcircuit and the EOLR, a fault resistor in parallel with the EOLR to change a value of an end of line resistance for a fault indication when the input current of the remote device has crossed the fault threshold.
Dependencies are inferred from the claim text.