EMUs electrical circuits are divided into low-voltage control circuits, high voltage power and auxiliary circuits and in general constitute a complex, multi-element, multiply object with feedback loops and a large number of parameters, and its reliable operation has a significant influence upon the security and uninterrupted functioning of the railway carryover conveyor.
A repair system, designed to maintain an acceptable reliability level of rolling-stock and based on the scheduled preventive principle, has already exhausted its resource of cheap, skilled labor force and is not currently able to provide a high level of safety, keeping to schedule and improving the transportation process quality while reducing costs. Lack of modern and reliable devices for technical condition monitoring is the main reason of EMUs defects and failures. According to the statistical accounting of «Russian railways» JSC, about 60% of these defects and failures occur in electrical circuits.
Achievement of a high efficiency and reliability in the technical condition assessment of complex objects is possible on the basis of technical diagnostics devices, which development and implementation is preceded by phases of the object study and the diagnostic algorithms synthesis.
Electrical circuits can be represented as a single discrete logic device, whose input, internal and output signals have two stable states, respectively, and for their analysis it is advisable to use the mathematical apparatus of logical algebra.
Kazarin D.V. Synthesis of algorithms for diagnostics of electric circuits // Omsk Research Journal. - 2009. - pp. 133-135
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