Device for the operation of an electromagnet an intrinsically safe direct current circuit and underground installation with electromagnets

摘要

An apparatus for operating a, which can be connected to an intrinsically safe direct current circuit is controlled between two switching positions - towards and herschaltbaren electromagnet (2, 3) for actuating the closing body of a hydraulic valve (5, 6), with a having a coil winding and an armature electromagnet (2, 3) and with an electronic control device (20), by means of which the supplied current in the pickup phase of the armature on a field current and in the holding phase to a lower holding current is adjustable, characterized by a measuring device (r₁, R₂, 21) for measuring the current is - in the coil winding, and an evaluation device (21) for detecting a movement of the armature on the basis of the measured current is -.