Wetting current diagnostics

摘要

A method of providing wetting current diagnostics for a load control switch includes changing test switch settings of a detection circuit from an operational configuration to a testing configuration. The test switch settings specify respective states of first and second test switches of the detection circuit. The first and second test switches are connected to a node of the detection circuit through which, in the operational configuration, a wetting current for the load control switch flows. The method includes determining whether a voltage at the node becomes no longer indicative of the operational configuration as a result of the changed test switch settings, returning the test switch settings to the operational configuration, and providing a wetting current fault indication if the voltage at the node fails to return to a level indicative of the operational configuration after returning the test switch settings to the operational configuration.

主权项

1. A method of providing wetting current diagnostics for a load control switch, the method comprising:
changing test switch settings of a detection circuit from an operational configuration to a testing configuration, the test switch settings specifying respective states of first and second test switches of the detection circuit, the first and second test switches being connected to a node of the detection circuit through which, in the operational configuration, a wetting current for the load control switch flows; determining whether a voltage at the node becomes no longer indicative of the operational configuration as a result of the changed test switch settings; returning the test switch settings to the operational configuration; and providing a wetting current fault indication if the voltage at the node fails to return to a level indicative of the operational configuration after returning the test switch settings to the operational configuration.