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.

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.

Abstract: A system and method for power supply ripple detection is disclosed. A voltage across one or more capacitors of the power supply is measured. An AC ripple voltage component of the capacitor voltage is then filtered and rectified into a DC signal. A level of ripple represented by the DC signal is then compared to threshold values to assess a health of the power supply. In one implementation, the power supplies provide power to control panels of one or more building management systems. The power supplies determine and report information concerning health of the power supplies to the control panels, the information including the DC signal itself and the result of the comparison of the DC signal to the threshold values. A cloud-based connected services system then receives and analyzes the information concerning health of the power supplies forwarded from control panels of multiple building management systems to determine trends.

Abstract: A system and method for power supply ripple detection is disclosed. A voltage across one or more capacitors of the power supply is measured. An AC ripple voltage component of the capacitor voltage is then filtered and rectified into a DC signal. A level of ripple represented by the DC signal is then compared to threshold values to assess a health of the power supply. In one implementation, the power supplies provide power to control panels of one or more building management systems. The power supplies determine and report information concerning health of the power supplies to the control panels, the information including the DC signal itself and the result of the comparison of the DC signal to the threshold values. A cloud-based connected services system then receives and analyzes the information concerning health of the power supplies forwarded from control panels of multiple building management systems to determine trends.

Abstract: A system and method for testing the capacities of battery backups in alarm systems. The system may include an alarm panel, a notification device connected to the alarm panel, a battery backup connected to the alarm panel and configured to provide the alarm panel and the notification appliance with electrical power. The system may further include test circuitry that is configured to monitor a voltage and an output current of the battery backup when the battery backup is placed under a battery capacity test, and a system controller that is configured to determine, from the monitored voltage and output current of the battery backup, information relating to the capacity of the battery backup. Such information may be communicated to a workstation or an offsite monitoring facility where it may be compiled with information relating to the capacities of other battery backups in the alarm system to create a report.

Abstract: A system and method for testing the capacities of battery backups in alarm systems. The system may include an alarm panel, a notification device connected to the alarm panel, a battery backup connected to the alarm panel and configured to provide the alarm panel and the notification appliance with electrical power. The system may further include test circuitry that is configured to monitor a voltage and an output current of the battery backup when the battery backup is placed under a battery capacity test, and a system controller that is configured to determine, from the monitored voltage and output current of the battery backup, information relating to the capacity of the battery backup. Such information may be communicated to a workstation or an offsite monitoring facility where it may be compiled with information relating to the capacities of other battery backups in the alarm system to create a report.