METHOD AND CIRCUIT FOR IN-SERVICE TESTING OF AN ELECTROMAGNETICALLY ACTUATED COMPONENT

摘要

A method and circuit for in-service testing of the winding of electromagnetic actuators and the like having a known effective response time and being connected between an energy supply and actuating circuit means, including driving the input of the actuating circuit means with a test signal similar to the effective actuating signal and limited to a duration shorter than the effective response time of the actuator; and activating return circuit means between the winding and the output of the actuating circuit means, by the winding current flow upon termination of the test signal whereby the flow of component self-induction current through the return circuit means furnishes a pulse signal output for checking the efficiency and integrity of the actuating circuit means, the electromagnetic actuator, and the electrical circuit connections therebetween without producing an erroneous intervention. An effective intervention may be produced by overriding the test signal with a control intervention signal.