| 摘要 |
A motor control apparatus (52) for a reversible motor (54) of a railway switch machine includes a conditional power source (50) having an output voltage (96). A motor control circuit includes inputs (+, -) for inputting the voltage from the power source, inputs for inputting a normal signal (N) and a reverse signal (R), two output terminals (98, 100) for electrical connection to two input terminals (68, 70) of the reversible motor (54), and a relay logic circuit including a pair of double pole, double throw relays (56, 58). The contacts of these relays output the voltage to the two output terminals (98, 100) in response to the normal signal (N), output an inverted polarity of the voltage to the two output terminals (98, 100) in response to the reverse signal (R), and short the two output terminals (98, 100) in response to absence of both of the normal and reverse signals. |
