RELAY FAILURE DETECTION SYSTEM

摘要

A relay fault detection and correction system includes a signal detector structured to measure primary and secondary signals, and generates a fault output signal if the signals appear to be unterminated due to a relay not connecting the signals to the loads. A cycle circuit is structured to cause a relay controller to cycle a potentially under-performing relay between its states a number of times after the signal detector generates the fault output.

主权项

1. A relay fault detection system structured to detect relay faults within a switching system, the relay fault detection system comprising:
a first relay having an input structured to couple to a first signal, and having first and second outputs, the first output coupled to a termination resistor and the second output coupled to an output of the switching system, the first relay structured to couple the first signal to the first output or the second output; a second relay having an input structured to couple to a second signal, and having first and second outputs, the second output coupled to a termination resistor and the first output coupled to the output of the switching system, the second relay structured to couple the second signal to the first output or the second output; a control system structured to operate the first and second relays to make exactly one of the first or second signals an active signal on the output of the switching system; a level detector coupled to the first signal and coupled to the second signal and structured to generate a signal level output from the first signal and from the second signal; a low threshold detector structured to detect a low signal level output as a signal fault; and a high threshold detector structured to detect a high signal level output as a relay fault.