Patent ID: 6366041
Filing Date: 2002-04-02
Classification: B61L,H02P

Abstract:
A control apparatus for a railway switch machine including a reversible motor having two input terminals, said control apparatus comprising:a conditional power source having a voltage; and a circuit comprising: means for inputting the voltage from the power source, means for inputting a normal signal and a reverse signal, two output terminals for electrical connection to the two input terminals of said reversible motor, and output means for: (a) outputting the voltage to the two output terminals in response to the normal signal, (b) outputting an inverted polarity of the voltage to the two output terminals in response to the reverse signal, and (c) shorting the two output terminals in response to absence of both of the normal and reverse signals, wherein said output means includes a plurality of relays having a plurality of contacts; and means employing the normal and reverse signals of said means for inputting for turning off the voltage of said conditional power source for a predetermined time before switching the contacts of said relays.