Automatically configuring vacuum contactor

摘要

A controller (14) for electromagnetically controlled electrical switches, such as a vacuum contactor (12) or the like, comprises a coil power source, a test circuit and a coil power source controller communicating with the coil power source and the test circuit to receive an actuation signal and to provide a power to the coil based on the actuation signal by controlling the coil power source. The controller in one form measures barometric pressure (46) and provides a short impedance characterizing pulse to the coils of the vacuum contactor coils to assess proper operating conditions of the coils and to check for coil or sensor faults. 14 20 ---- 15 -- 22 44(2 46 29 36:3